diff --git a/History.md b/History.md
index 6166f7545e..627bf4e6ad 100644
--- a/History.md
+++ b/History.md
@@ -1,8 +1,33 @@
 ## v.NEXT
 
-* Meteor's test runners have been updated to use headless Chrome instead for 
-browser tests. Test can still be run using PhantomJS by passing --phantom 
-to the self test command. 
+* Meteor's `self-test` has been updated to use "headless" Chrome rather
+  than PhantomJS for browser tests. PhantomJS can still be forced by
+  passing the `--phantom` flag to the `meteor self-test` command.
+  [PR #9814](https://github.com/meteor/meteor/pull/9814)
+
+## v1.7.0.3, 2018-06-13
+
+* Fixed [Issue #9991](https://github.com/meteor/meteor/issues/9991),
+  introduced in
+  [Meteor 1.7.0.2](https://github.com/meteor/meteor/pull/9990)
+  by [PR #9977](https://github.com/meteor/meteor/pull/9977).
+
+## v1.7.0.2, 2018-06-13
+
+* Node has been updated to version
+  [8.11.3](https://nodejs.org/en/blog/release/v8.11.3/), an important
+  [security release](https://nodejs.org/en/blog/vulnerability/june-2018-security-releases/).
+
+* The `meteor-babel` npm package has been updated to version
+  [7.0.0-beta.51](https://github.com/babel/babel/releases/tag/v7.0.0-beta.51).
+
+* Meteor apps created with `meteor create` or `meteor create --minimal`
+  will now have a directory called `tests/` rather than `test/`, so that
+  test code will not be eagerly loaded if you decide to remove the
+  `meteor.mainModule` configuration from `package.json`, thanks to
+  [PR #9977](https://github.com/meteor/meteor/pull/9977) by
+  [@robfallows](https://github.com/robfallows).
+  [Issue #9961](https://github.com/meteor/meteor/issues/9961)
 
 ## v1.7.0.1, 2018-05-29
 
diff --git a/meteor b/meteor
index 9906a76523..206e12b0cc 100755
--- a/meteor
+++ b/meteor
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-BUNDLE_VERSION=8.11.2.8
+BUNDLE_VERSION=8.11.3.1
 
 # OS Check. Put here because here is where we download the precompiled
 # bundles that are arch specific.
diff --git a/packages/babel-compiler/.npm/package/npm-shrinkwrap.json b/packages/babel-compiler/.npm/package/npm-shrinkwrap.json
index 0e992ffa2c..f20eec836b 100644
--- a/packages/babel-compiler/.npm/package/npm-shrinkwrap.json
+++ b/packages/babel-compiler/.npm/package/npm-shrinkwrap.json
@@ -2,344 +2,344 @@
   "lockfileVersion": 1,
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-      "integrity": "sha1-vs2AVIJzREDJ0TfkbXc0DmTX9Rs="
+      "version": "7.0.0-beta.51",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0-beta.51.tgz",
+      "integrity": "sha1-vXHZsZKvl435FYKdOdQJRFZDmgw="
     },
     "@babel/core": {
-      "version": "7.0.0-beta.49",
-      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.0.0-beta.49.tgz",
-      "integrity": "sha1-c94ggd1lJIlInwy0qpeCmhEzMU4="
+      "version": "7.0.0-beta.51",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.0.0-beta.51.tgz",
+      "integrity": "sha1-DlS9a2OHNrKuWTwxpH8JaeKyuW0="
     },
     "@babel/generator": {
-      "version": "7.0.0-beta.49",
-      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.0.0-beta.49.tgz",
-      "integrity": "sha1-6c/9qROZaszseTu8JauRvBnQv3o="
+      "version": "7.0.0-beta.51",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.0.0-beta.51.tgz",
+      "integrity": "sha1-bHV1/952HQdIXgS67cA5LG2eMPY="
     },
     "@babel/helper-annotate-as-pure": {
-      "version": "7.0.0-beta.49",
-      "resolved": "https://registry.npmjs.org/@babel/helper-annotate-as-pure/-/helper-annotate-as-pure-7.0.0-beta.49.tgz",
-      "integrity": "sha1-fZAF1U/nrWy4dnkCUedVdUGRhuk="
+      "version": "7.0.0-beta.51",
+      "resolved": "https://registry.npmjs.org/@babel/helper-annotate-as-pure/-/helper-annotate-as-pure-7.0.0-beta.51.tgz",
+      "integrity": "sha1-OM95IL9fM4oif3VOKGtvut7gS1g="
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+          "integrity": "sha512-m5hnHTkcVsPfqx3AKlyttIPb7J+XykHvJP2B9bZDjlhLIoEq4XoK64Vg7boZlVWYK6LUY94dYPEE7Lh0ZkZKcQ=="
+        },
+        "is-data-descriptor": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/is-data-descriptor/-/is-data-descriptor-1.0.0.tgz",
+          "integrity": "sha512-jbRXy1FmtAoCjQkVmIVYwuuqDFUbaOeDjmed1tOGPrsMhtJA4rD9tkgA0F1qJ3gRFRXcHYVkdeaP50Q5rE/jLQ=="
+        },
+        "is-descriptor": {
+          "version": "1.0.2",
+          "resolved": "https://registry.npmjs.org/is-descriptor/-/is-descriptor-1.0.2.tgz",
+          "integrity": "sha512-2eis5WqQGV7peooDyLmNEPUrps9+SXX5c9pL3xEB+4e9HnGuDa7mB7kHxHw4CbqS9k1T2hOH3miL8n8WtiYVtg=="
+        }
+      }
+    },
+    "snapdragon-util": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/snapdragon-util/-/snapdragon-util-3.0.1.tgz",
+      "integrity": "sha512-mbKkMdQKsjX4BAL4bRYTj21edOf8cN7XHdYUJEe+Zn99hVEYcMvKPct1IqNe7+AZPirn8BCDOQBHQZknqmKlZQ==",
+      "dependencies": {
+        "kind-of": {
+          "version": "3.2.2",
+          "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-3.2.2.tgz",
+          "integrity": "sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ="
+        }
+      }
+    },
     "source-map": {
       "version": "0.5.7",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
       "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w="
     },
+    "source-map-resolve": {
+      "version": "0.5.2",
+      "resolved": "https://registry.npmjs.org/source-map-resolve/-/source-map-resolve-0.5.2.tgz",
+      "integrity": "sha512-MjqsvNwyz1s0k81Goz/9vRBe9SZdB09Bdw+/zYyO+3CuPk6fouTaxscHkgtE8jKvf01kVfl8riHzERQ/kefaSA=="
+    },
+    "source-map-url": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/source-map-url/-/source-map-url-0.4.0.tgz",
+      "integrity": "sha1-PpNdfd1zYxuXZZlW1VEo6HtQhKM="
+    },
+    "split-string": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/split-string/-/split-string-3.1.0.tgz",
+      "integrity": "sha512-NzNVhJDYpwceVVii8/Hu6DKfD2G+NrQHlS/V/qgv763EYudVwEcMQNxd2lh+0VrUByXN/oJkl5grOhYWvQUYiw=="
+    },
+    "static-extend": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/static-extend/-/static-extend-0.1.2.tgz",
+      "integrity": "sha1-YICcOcv/VTNyJv1eC1IPNB8ftcY=",
+      "dependencies": {
+        "define-property": {
+          "version": "0.2.5",
+          "resolved": "https://registry.npmjs.org/define-property/-/define-property-0.2.5.tgz",
+          "integrity": "sha1-w1se+RjsPJkPmlvFe+BKrOxcgRY="
+        }
+      }
+    },
     "supports-color": {
       "version": "5.4.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.4.0.tgz",
@@ -885,30 +1225,103 @@
       "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
       "integrity": "sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4="
     },
+    "to-object-path": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/to-object-path/-/to-object-path-0.3.0.tgz",
+      "integrity": "sha1-KXWIt7Dn4KwI4E5nL4XB9JmeF68=",
+      "dependencies": {
+        "kind-of": {
+          "version": "3.2.2",
+          "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-3.2.2.tgz",
+          "integrity": "sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ="
+        }
+      }
+    },
+    "to-regex": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/to-regex/-/to-regex-3.0.2.tgz",
+      "integrity": "sha512-FWtleNAtZ/Ki2qtqej2CXTOayOH9bHDQF+Q48VpWyDXjbYxA4Yz8iDB31zXOBUlOHHKidDbqGVrTUvQMPmBGBw=="
+    },
+    "to-regex-range": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-2.1.1.tgz",
+      "integrity": "sha1-fIDBe53+vlmeJzZ+DU3VWQFB2zg="
+    },
     "trim-right": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/trim-right/-/trim-right-1.0.1.tgz",
       "integrity": "sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM="
     },
     "unicode-canonical-property-names-ecmascript": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/unicode-canonical-property-names-ecmascript/-/unicode-canonical-property-names-ecmascript-1.0.3.tgz",
-      "integrity": "sha512-iG/2t0F2LAU8aZYPkX5gi7ebukHnr3sWFESpb+zPQeeaQwOkfoO6ZW17YX7MdRPNG9pCy+tjzGill+Ah0Em0HA=="
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/unicode-canonical-property-names-ecmascript/-/unicode-canonical-property-names-ecmascript-1.0.4.tgz",
+      "integrity": "sha512-jDrNnXWHd4oHiTZnx/ZG7gtUTVp+gCcTTKr8L0HjlwphROEW3+Him+IpvC+xcJEFegapiMZyZe02CyuOnRmbnQ=="
     },
     "unicode-match-property-ecmascript": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/unicode-match-property-ecmascript/-/unicode-match-property-ecmascript-1.0.3.tgz",
-      "integrity": "sha512-nFcaBFcr08UQNF15ZgI5ISh3yUnQm7SJRRxwYrL5VYX46pS+6Q7TCTv4zbK+j6/l7rQt0mMiTL2zpmeygny6rA=="
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/unicode-match-property-ecmascript/-/unicode-match-property-ecmascript-1.0.4.tgz",
+      "integrity": "sha512-L4Qoh15vTfntsn4P1zqnHulG0LdXgjSO035fEpdtp6YxXhMT51Q6vgM5lYdG/5X3MjS+k/Y9Xw4SFCY9IkR0rg=="
     },
     "unicode-match-property-value-ecmascript": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/unicode-match-property-value-ecmascript/-/unicode-match-property-value-ecmascript-1.0.1.tgz",
-      "integrity": "sha512-lM8B0FDZQh9yYGgiabRQcyWicB27VLOolSBRIxsO7FeQPtg+79Oe7sC8Mzr8BObDs+G9CeYmC/shHo6OggNEog=="
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/unicode-match-property-value-ecmascript/-/unicode-match-property-value-ecmascript-1.0.2.tgz",
+      "integrity": "sha512-Rx7yODZC1L/T8XKo/2kNzVAQaRE88AaMvI1EF/Xnj3GW2wzN6fop9DDWuFAKUVFH7vozkz26DzP0qyWLKLIVPQ=="
     },
     "unicode-property-aliases-ecmascript": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/unicode-property-aliases-ecmascript/-/unicode-property-aliases-ecmascript-1.0.3.tgz",
-      "integrity": "sha512-TdDmDOTxEf2ad1g3ZBpM6cqKIb2nJpVlz1Q++casDryKz18tpeMBhSng9hjC1CTQCkOV9Rw2knlSB6iRo7ad1w=="
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/unicode-property-aliases-ecmascript/-/unicode-property-aliases-ecmascript-1.0.4.tgz",
+      "integrity": "sha512-2WSLa6OdYd2ng8oqiGIWnJqyFArvhn+5vgx5GTxMbUYjCYKUcuKS62YLFF0R/BDGlB1yzXjQOLtPAfHsgirEpg=="
+    },
+    "union-value": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.0.tgz",
+      "integrity": "sha1-XHHDTLW61dzr4+oM0IIHulqhrqQ=",
+      "dependencies": {
+        "extend-shallow": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-2.0.1.tgz",
+          "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8="
+        },
+        "set-value": {
+          "version": "0.4.3",
+          "resolved": "https://registry.npmjs.org/set-value/-/set-value-0.4.3.tgz",
+          "integrity": "sha1-fbCPnT0i3H945Trzw79GZuzfzPE="
+        }
+      }
+    },
+    "unset-value": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unset-value/-/unset-value-1.0.0.tgz",
+      "integrity": "sha1-g3aHP30jNRef+x5vw6jtDfyKtVk=",
+      "dependencies": {
+        "has-value": {
+          "version": "0.3.1",
+          "resolved": "https://registry.npmjs.org/has-value/-/has-value-0.3.1.tgz",
+          "integrity": "sha1-ex9YutpiyoJ+wKIHgCVlSEWZXh8=",
+          "dependencies": {
+            "isobject": {
+              "version": "2.1.0",
+              "resolved": "https://registry.npmjs.org/isobject/-/isobject-2.1.0.tgz",
+              "integrity": "sha1-8GVWEJaj8dou9GJy+BXIQNh+DIk="
+            }
+          }
+        },
+        "has-values": {
+          "version": "0.1.4",
+          "resolved": "https://registry.npmjs.org/has-values/-/has-values-0.1.4.tgz",
+          "integrity": "sha1-bWHeldkd/Km5oCCJrThL/49it3E="
+        }
+      }
+    },
+    "urix": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz",
+      "integrity": "sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI="
+    },
+    "use": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/use/-/use-3.1.0.tgz",
+      "integrity": "sha512-6UJEQM/L+mzC3ZJNM56Q4DFGLX/evKGRg15UJHGB9X5j5Z3AFbgZvjUh2yq/UJUY4U5dh7Fal++XbNg1uzpRAw=="
     }
   }
 }
diff --git a/packages/babel-compiler/babel-compiler.js b/packages/babel-compiler/babel-compiler.js
index 7c9e5a7c8e..14fdee6143 100644
--- a/packages/babel-compiler/babel-compiler.js
+++ b/packages/babel-compiler/babel-compiler.js
@@ -21,15 +21,27 @@ var hasOwn = Object.prototype.hasOwnProperty;
 var isMeteorPre144 = semver.lt(process.version, "4.8.1");
 
 BCp.processFilesForTarget = function (inputFiles) {
+  var compiler = this;
+
   // Reset this cache for each batch processed.
   this._babelrcCache = null;
 
   inputFiles.forEach(function (inputFile) {
-    var toBeAdded = this.processOneFileForTarget(inputFile);
-    if (toBeAdded) {
-      inputFile.addJavaScript(toBeAdded);
+    if (inputFile.supportsLazyCompilation) {
+      inputFile.addJavaScript({
+        path: inputFile.getPathInPackage(),
+        hash: inputFile.getSourceHash(),
+        bare: !! inputFile.getFileOptions().bare
+      }, function () {
+        return compiler.processOneFileForTarget(inputFile);
+      });
+    } else {
+      var toBeAdded = compiler.processOneFileForTarget(inputFile);
+      if (toBeAdded) {
+        inputFile.addJavaScript(toBeAdded);
+      }
     }
-  }, this);
+  });
 };
 
 // Returns an object suitable for passing to inputFile.addJavaScript, or
diff --git a/packages/babel-compiler/package.js b/packages/babel-compiler/package.js
index 2d863bb6da..a37b2028f3 100644
--- a/packages/babel-compiler/package.js
+++ b/packages/babel-compiler/package.js
@@ -6,11 +6,11 @@ Package.describe({
   // isn't possible because you can't publish a non-recommended
   // release with package versions that don't have a pre-release
   // identifier at the end (eg, -dev)
-  version: '7.1.0'
+  version: '7.2.0'
 });
 
 Npm.depends({
-  'meteor-babel': '7.0.0-beta.49-1'
+  'meteor-babel': '7.0.0-beta.51'
 });
 
 Package.onUse(function (api) {
diff --git a/packages/caching-compiler/.npm/package/.gitignore b/packages/caching-compiler/.npm/package/.gitignore
deleted file mode 100644
index 3c3629e647..0000000000
--- a/packages/caching-compiler/.npm/package/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-node_modules
diff --git a/packages/caching-compiler/.npm/package/README b/packages/caching-compiler/.npm/package/README
deleted file mode 100644
index 3d492553a4..0000000000
--- a/packages/caching-compiler/.npm/package/README
+++ /dev/null
@@ -1,7 +0,0 @@
-This directory and the files immediately inside it are automatically generated
-when you change this package's NPM dependencies. Commit the files in this
-directory (npm-shrinkwrap.json, .gitignore, and this README) to source control
-so that others run the same versions of sub-dependencies.
-
-You should NOT check in the node_modules directory that Meteor automatically
-creates; if you are using git, the .gitignore file tells git to ignore it.
diff --git a/packages/caching-compiler/.npm/package/npm-shrinkwrap.json b/packages/caching-compiler/.npm/package/npm-shrinkwrap.json
deleted file mode 100644
index f0ac52d443..0000000000
--- a/packages/caching-compiler/.npm/package/npm-shrinkwrap.json
+++ /dev/null
@@ -1,15 +0,0 @@
-{
-  "lockfileVersion": 1,
-  "dependencies": {
-    "async": {
-      "version": "1.4.0",
-      "resolved": "https://registry.npmjs.org/async/-/async-1.4.0.tgz",
-      "integrity": "sha1-Nfhvg8WeBCHQmc2akdgnj7V4wA0="
-    },
-    "lru-cache": {
-      "version": "2.6.4",
-      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-2.6.4.tgz",
-      "integrity": "sha1-JnUZDM0bBwHsL2UqTQ09QA12wN0="
-    }
-  }
-}
diff --git a/packages/caching-compiler/caching-compiler.js b/packages/caching-compiler/caching-compiler.js
index 6c4abd335f..f8198b360c 100644
--- a/packages/caching-compiler/caching-compiler.js
+++ b/packages/caching-compiler/caching-compiler.js
@@ -2,9 +2,7 @@ const fs = Plugin.fs;
 const path = Plugin.path;
 const createHash = Npm.require('crypto').createHash;
 const assert = Npm.require('assert');
-const Future = Npm.require('fibers/future');
 const LRU = Npm.require('lru-cache');
-const async = Npm.require('async');
 
 // Base class for CachingCompiler and MultiFileCachingCompiler.
 CachingCompilerBase = class CachingCompilerBase {
@@ -283,14 +281,12 @@ CachingCompiler = class CachingCompiler extends CachingCompilerBase {
     const cacheMisses = [];
     const arches = this._cacheDebugEnabled && Object.create(null);
 
-    const future = new Future;
-    async.eachLimit(inputFiles, this._maxParallelism, (inputFile, cb) => {
+    return Promise.all(inputFiles.map(async (inputFile) => {
       if (arches) {
         arches[inputFile.getArch()] = 1;
       }
 
-      let error = null;
-      try {
+      const getResult = async () => {
         const cacheKey = this._deepHash(this.getCacheKey(inputFile));
         let compileResult = this._cache.get(cacheKey);
 
@@ -303,7 +299,7 @@ CachingCompiler = class CachingCompiler extends CachingCompilerBase {
 
         if (! compileResult) {
           cacheMisses.push(inputFile.getDisplayPath());
-          compileResult = this.compileOneFile(inputFile);
+          compileResult = await this.compileOneFile(inputFile);
 
           if (! compileResult) {
             // compileOneFile should have called inputFile.error.
@@ -316,17 +312,27 @@ CachingCompiler = class CachingCompiler extends CachingCompilerBase {
           this._writeCacheAsync(cacheKey, compileResult);
         }
 
-        this.addCompileResult(inputFile, compileResult);
-      } catch (e) {
-        error = e;
-      } finally {
-        cb(error);
-      }
-    }, future.resolver());
-    future.wait();
+        return compileResult;
+      };
+
+      if (this.compileOneFileLater &&
+          inputFile.supportsLazyCompilation &&
+          ! this._cacheDebugEnabled) {
+        await this.compileOneFileLater(inputFile, getResult);
+      } else {
+        const result = await getResult();
+        if (result) {
+          this.addCompileResult(inputFile, result);
+        }
+      }
+
+    })).then(() => {
+      if (! this._cacheDebugEnabled) {
+        return;
+      }
 
-    if (this._cacheDebugEnabled) {
       cacheMisses.sort();
+
       this._cacheDebug(
         `Ran (#${
           ++this._callCount
@@ -336,7 +342,7 @@ CachingCompiler = class CachingCompiler extends CachingCompilerBase {
           JSON.stringify(Object.keys(arches).sort())
         }`
       );
-    }
+    });
   }
 
   _cacheFilename(cacheKey) {
diff --git a/packages/caching-compiler/multi-file-caching-compiler.js b/packages/caching-compiler/multi-file-caching-compiler.js
index 6cb698cb34..2bc0f41b2c 100644
--- a/packages/caching-compiler/multi-file-caching-compiler.js
+++ b/packages/caching-compiler/multi-file-caching-compiler.js
@@ -1,7 +1,5 @@
 const path = Plugin.path;
-const Future = Npm.require('fibers/future');
 const LRU = Npm.require('lru-cache');
-const async = Npm.require('async');
 
 // MultiFileCachingCompiler is like CachingCompiler, but for implementing
 // languages which allow files to reference each other, such as CSS
@@ -92,20 +90,12 @@ extends CachingCompilerBase {
       cacheKeyMap.set(importPath, this._getCacheKeyWithPath(inputFile));
     });
 
-    const allProcessedFuture = new Future;
-    async.eachLimit(inputFiles, this._maxParallelism, (inputFile, cb) => {
+    return Promise.all(inputFiles.map(async (inputFile) => {
       if (arches) {
         arches[inputFile.getArch()] = 1;
       }
 
-      let error = null;
-      try {
-        // If this isn't a root, skip it (and definitely don't waste time
-        // looking for a cache file that won't be there).
-        if (!this.isRoot(inputFile)) {
-          return;
-        }
-
+      const getResult = async () => {
         const absoluteImportPath = this.getAbsoluteImportPath(inputFile);
         const cacheKey = cacheKeyMap.get(absoluteImportPath);
         let cacheEntry = this._cache.get(cacheKey);
@@ -119,13 +109,19 @@ extends CachingCompilerBase {
         if (! (cacheEntry && this._cacheEntryValid(cacheEntry, cacheKeyMap))) {
           cacheMisses.push(inputFile.getDisplayPath());
 
-          const compileOneFileReturn = this.compileOneFile(inputFile, allFiles);
+          const compileOneFileReturn =
+            await this.compileOneFile(inputFile, allFiles);
+
           if (! compileOneFileReturn) {
             // compileOneFile should have called inputFile.error.
-            //  We don't cache failures for now.
+            // We don't cache failures for now.
             return;
           }
-          const {compileResult, referencedImportPaths} = compileOneFileReturn;
+
+          const {
+            compileResult,
+            referencedImportPaths,
+          } = compileOneFileReturn;
 
           cacheEntry = {
             compileResult,
@@ -148,17 +144,27 @@ extends CachingCompilerBase {
           this._writeCacheAsync(cacheKey, cacheEntry);
         }
 
-        this.addCompileResult(inputFile, cacheEntry.compileResult);
-      } catch (e) {
-        error = e;
-      } finally {
-        cb(error);
-      }
-    }, allProcessedFuture.resolver());
-    allProcessedFuture.wait();
+        return cacheEntry.compileResult;
+      };
+
+      if (this.compileOneFileLater &&
+          inputFile.supportsLazyCompilation &&
+          ! this._cacheDebugEnabled) {
+        await this.compileOneFileLater(inputFile, getResult);
+      } else if (this.isRoot(inputFile)) {
+        const result = await getResult();
+        if (result) {
+          this.addCompileResult(inputFile, result);
+        }
+      }
+
+    })).then(() => {
+      if (! this._cacheDebugEnabled) {
+        return;
+      }
 
-    if (this._cacheDebugEnabled) {
       cacheMisses.sort();
+
       this._cacheDebug(
         `Ran (#${
           ++this._callCount
@@ -166,8 +172,9 @@ extends CachingCompilerBase {
           JSON.stringify(cacheMisses)
         } ${
           JSON.stringify(Object.keys(arches).sort())
-        }`);
-    }
+        }`
+      );
+    });
   }
 
   // Returns a hash that incorporates both this.getCacheKey(inputFile) and
diff --git a/packages/caching-compiler/package.js b/packages/caching-compiler/package.js
index 37b38bfde1..987d9b7651 100644
--- a/packages/caching-compiler/package.js
+++ b/packages/caching-compiler/package.js
@@ -1,15 +1,10 @@
 Package.describe({
   name: 'caching-compiler',
-  version: '1.1.12',
+  version: '1.2.0',
   summary: 'An easy way to make compiler plugins cache',
   documentation: 'README.md'
 });
 
-Npm.depends({
-  'lru-cache': '2.6.4',
-  'async': '1.4.0'
-});
-
 Package.onUse(function(api) {
   api.use(['ecmascript', 'random']);
   api.addFiles(['caching-compiler.js'], 'server');
diff --git a/packages/dynamic-import/package.js b/packages/dynamic-import/package.js
index c622aa1c76..dd99bbd177 100644
--- a/packages/dynamic-import/package.js
+++ b/packages/dynamic-import/package.js
@@ -1,6 +1,6 @@
 Package.describe({
   name: "dynamic-import",
-  version: "0.4.0",
+  version: "0.4.1",
   summary: "Runtime support for Meteor 1.5 dynamic import(...) syntax",
   documentation: "README.md"
 });
diff --git a/packages/dynamic-import/server.js b/packages/dynamic-import/server.js
index 0bdbeb8e69..ed29b51767 100644
--- a/packages/dynamic-import/server.js
+++ b/packages/dynamic-import/server.js
@@ -66,7 +66,11 @@ function middleware(request, response) {
   response.setHeader("Access-Control-Allow-Origin", "*");
 
   if (request.method === "OPTIONS") {
-    response.setHeader("Access-Control-Allow-Headers", "*");
+    const acrh = request.headers["access-control-request-headers"];
+    response.setHeader(
+      "Access-Control-Allow-Headers",
+      typeof acrh === "string" ? acrh : "*"
+    );
     response.setHeader("Access-Control-Allow-Methods", "POST");
     response.end();
   } else if (request.method === "POST") {
diff --git a/packages/ecmascript/package.js b/packages/ecmascript/package.js
index 4a0fb4ac9b..63c03acaf7 100644
--- a/packages/ecmascript/package.js
+++ b/packages/ecmascript/package.js
@@ -1,6 +1,6 @@
 Package.describe({
   name: 'ecmascript',
-  version: '0.11.0',
+  version: '0.11.1',
   summary: 'Compiler plugin that supports ES2015+ in all .js files',
   documentation: 'README.md'
 });
diff --git a/packages/less/package.js b/packages/less/package.js
index 4246551c39..363b4c6926 100644
--- a/packages/less/package.js
+++ b/packages/less/package.js
@@ -1,6 +1,6 @@
 Package.describe({
   name: 'less',
-  version: '2.7.12',
+  version: '2.8.0',
   summary: 'Leaner CSS language',
   documentation: 'README.md'
 });
diff --git a/packages/less/plugin/compile-less.js b/packages/less/plugin/compile-less.js
index 4b428d2f51..ffd8bbb25a 100644
--- a/packages/less/plugin/compile-less.js
+++ b/packages/less/plugin/compile-less.js
@@ -1,6 +1,5 @@
 const path = Plugin.path;
 const less = Npm.require('less');
-const Future = Npm.require('fibers/future');
 
 Plugin.registerCompiler({
   // *.lessimport has been deprecated since 0.7.1, but it still works. We
@@ -45,49 +44,66 @@ class LessCompiler extends MultiFileCachingCompiler {
              /\.lessimport$/.test(pathInPackage));
   }
 
+  compileOneFileLater(inputFile, getResult) {
+    inputFile.addStylesheet({
+      path: inputFile.getPathInPackage(),
+    }, async () => {
+      const result = await getResult();
+      return result && {
+        data: result.css,
+        sourceMap: result.sourceMap,
+      };
+    });
+  }
+
   compileOneFile(inputFile, allFiles) {
     const importPlugin = new MeteorImportLessPlugin(allFiles);
 
-    const f = new Future;
-    let output;
-    try {
-      less.render(inputFile.getContentsAsBuffer().toString('utf8'), {
-        filename: this.getAbsoluteImportPath(inputFile),
-        plugins: [importPlugin],
-        // Generate a source map, and include the source files in the
-        // sourcesContent field.  (Note that source files which don't themselves
-        // produce text (eg, are entirely variable definitions) won't end up in
-        // the source map!)
-        sourceMap: { outputSourceFiles: true }
-      }, f.resolver());
-      output = f.wait();
-    } catch (e) {
+    return less.render(inputFile.getContentsAsBuffer().toString('utf8'), {
+      filename: this.getAbsoluteImportPath(inputFile),
+      plugins: [importPlugin],
+      // Generate a source map, and include the source files in the
+      // sourcesContent field. (Note that source files which don't
+      // themselves produce text (eg, are entirely variable definitions)
+      // won't end up in the source map!)
+      sourceMap: { outputSourceFiles: true }
+
+    }).then(output => {
+      if (output.map) {
+        const map = JSON.parse(output.map);
+        map.sources = map.sources.map(decodeFilePath);
+        output.map = map;
+      }
+
+      const compileResult = {
+        css: output.css,
+        sourceMap: output.map,
+      };
+
+      const referencedImportPaths = [];
+      output.imports.forEach((path) => {
+        // Some files that show up in output.imports are not actually files; for
+        // example @import url("...");
+        if (allFiles.has(path)) {
+          referencedImportPaths.push(path);
+        }
+      });
+
+      return {
+        compileResult,
+        referencedImportPaths,
+      };
+
+    }, e => {
       inputFile.error({
         message: e.message,
         sourcePath: decodeFilePath(e.filename),
         line: e.line,
         column: e.column
       });
+
       return null;
-    }
-
-    if (output.map) {
-      const map = JSON.parse(output.map);
-      map.sources = map.sources.map(decodeFilePath);
-      output.map = map;
-    }
-
-    const compileResult = {css: output.css, sourceMap: output.map};
-    const referencedImportPaths = [];
-    output.imports.forEach((path) => {
-      // Some files that show up in output.imports are not actually files; for
-      // example @import url("...");
-      if (allFiles.has(path)) {
-        referencedImportPaths.push(path);
-      }
     });
-
-    return {compileResult, referencedImportPaths};
   }
 
   addCompileResult(inputFile, compileResult) {
diff --git a/packages/meteor-tool/package.js b/packages/meteor-tool/package.js
index d7f4740d29..5cce8e2483 100644
--- a/packages/meteor-tool/package.js
+++ b/packages/meteor-tool/package.js
@@ -1,6 +1,6 @@
 Package.describe({
   summary: "The Meteor command-line tool",
-  version: '1.7.0_1'
+  version: '1.7.0_3'
 });
 
 Package.includeTool();
diff --git a/packages/socket-stream-client/browser.js b/packages/socket-stream-client/browser.js
index 8ecf677a2c..db75e4ddec 100644
--- a/packages/socket-stream-client/browser.js
+++ b/packages/socket-stream-client/browser.js
@@ -5,6 +5,11 @@ import {
 
 import { StreamClientCommon } from "./common.js";
 
+// Statically importing SockJS here will prevent native WebSocket usage
+// below (in favor of SockJS), but will ensure maximum compatibility for
+// clients stuck in unusual networking environments.
+import "./sockjs-0.3.4.js";
+
 export class ClientStream extends StreamClientCommon {
   // @param url {String} URL to Meteor app
   //   "http://subdomain.meteor.com/" or "/" or
diff --git a/packages/socket-stream-client/package.js b/packages/socket-stream-client/package.js
index 791bddc65a..dd9e4a73b4 100644
--- a/packages/socket-stream-client/package.js
+++ b/packages/socket-stream-client/package.js
@@ -1,6 +1,6 @@
 Package.describe({
   name: "socket-stream-client",
-  version: "0.2.1",
+  version: "0.2.2",
   summary: "Provides the ClientStream abstraction used by ddp-client",
   documentation: "README.md"
 });
diff --git a/packages/webapp/legacy_test_asset.js b/packages/webapp/legacy_test_asset.js
new file mode 100644
index 0000000000..e889f09131
--- /dev/null
+++ b/packages/webapp/legacy_test_asset.js
@@ -0,0 +1 @@
+console.log("LEGACY");
diff --git a/packages/webapp/modern_test_asset.js b/packages/webapp/modern_test_asset.js
new file mode 100644
index 0000000000..c30017283a
--- /dev/null
+++ b/packages/webapp/modern_test_asset.js
@@ -0,0 +1 @@
+console.log("MODERN");
diff --git a/packages/webapp/package.js b/packages/webapp/package.js
index 6e71c856dd..c65234f9e7 100644
--- a/packages/webapp/package.js
+++ b/packages/webapp/package.js
@@ -1,6 +1,6 @@
 Package.describe({
   summary: "Serves a Meteor app over HTTP",
-  version: '1.6.0'
+  version: '1.6.1'
 });
 
 Npm.depends({"basic-auth-connect": "1.0.0",
@@ -57,4 +57,7 @@ Package.onTest(function (api) {
   api.addFiles('webapp_tests.js', 'server');
   api.addFiles('webapp_client_tests.js', 'client');
   api.addFiles('socket_file_tests.js', 'server');
+
+  api.addAssets('modern_test_asset.js', 'web.browser');
+  api.addAssets('legacy_test_asset.js', 'legacy');
 });
diff --git a/packages/webapp/webapp_server.js b/packages/webapp/webapp_server.js
index 700b12c8fd..870b31c96b 100644
--- a/packages/webapp/webapp_server.js
+++ b/packages/webapp/webapp_server.js
@@ -484,23 +484,33 @@ function getStaticFileInfo(originalPath, browser) {
     return null;
   }
 
-  if (hasOwn.call(staticFilesByArch, arch)) {
+  // Get a list of all available static file architectures, with arch
+  // first in the list if it exists.
+  const staticArchList = Object.keys(staticFilesByArch);
+  const archIndex = staticArchList.indexOf(arch);
+  if (archIndex > 0) {
+    staticArchList.unshift(staticArchList.splice(archIndex, 1)[0]);
+  }
+
+  let info = null;
+
+  staticArchList.some(arch => {
     const staticFiles = staticFilesByArch[arch];
 
     // If staticFiles contains originalPath with the arch inferred above,
     // use that information.
     if (hasOwn.call(staticFiles, originalPath)) {
-      return staticFiles[originalPath];
+      return info = staticFiles[originalPath];
     }
 
     // If getArchAndPath returned an alternate path, try that instead.
     if (path !== originalPath &&
         hasOwn.call(staticFiles, path)) {
-      return staticFiles[path];
+      return info = staticFiles[path];
     }
-  }
+  });
 
-  return null;
+  return info;
 }
 
 function getArchAndPath(path, browser) {
diff --git a/packages/webapp/webapp_tests.js b/packages/webapp/webapp_tests.js
index b8fe5201bd..722583b334 100644
--- a/packages/webapp/webapp_tests.js
+++ b/packages/webapp/webapp_tests.js
@@ -2,6 +2,7 @@ const url = require("url");
 const crypto = require("crypto");
 const http = require("http");
 const streamToString = require("stream-to-string");
+import { isModern } from "meteor/modern-browsers";
 
 const additionalScript = "(function () { var foo = 1; })";
 WebAppInternals.addStaticJs(additionalScript);
@@ -68,6 +69,83 @@ Tinytest.add("webapp - content-type header", function (test) {
              "application/javascript; charset=utf-8");
 });
 
+const modernUserAgent =
+  "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) " +
+  "AppleWebKit/537.36 (KHTML, like Gecko) " +
+  "Chrome/68.0.3440.15 Safari/537.36";
+
+const legacyUserAgent = "legacy";
+
+Tinytest.addAsync("webapp - modern/legacy static files", test => {
+  test.equal(isModern(WebAppInternals.identifyBrowser(modernUserAgent)), true);
+  test.equal(isModern(WebAppInternals.identifyBrowser(legacyUserAgent)), false);
+
+  const promises = [];
+
+  Object.keys(WebAppInternals.staticFilesByArch).forEach(arch => {
+    const staticFiles = WebAppInternals.staticFilesByArch[arch];
+
+    Object.keys(staticFiles).forEach(path => {
+      const { type } = staticFiles[path];
+      if (type !== "asset") {
+        return;
+      }
+
+      const pathMatch = /\/(modern|legacy)_test_asset\.js$/.exec(path);
+      if (! pathMatch) {
+        return;
+      }
+
+      const absUrl = url.resolve(Meteor.absoluteUrl(), path);
+
+      [ // Try to request the modern/legacy assets with both modern and
+        // legacy User Agent strings. (#9953)
+        modernUserAgent,
+        legacyUserAgent,
+      ].forEach(ua => promises.push(new Promise((resolve, reject) => {
+        HTTP.get(absUrl, {
+          headers: {
+            "User-Agent": ua
+          }
+        }, (error, response) => {
+          if (error) {
+            reject(error);
+            return;
+          }
+
+          if (response.statusCode !== 200) {
+            reject(new Error(`Bad status code ${
+              response.statusCode
+            } for ${path}`));
+            return;
+          }
+
+          const contentType = response.headers["content-type"];
+          if (! contentType.startsWith("application/javascript")) {
+            reject(new Error(`Bad Content-Type ${contentType} for ${path}`));
+            return;
+          }
+
+          const expectedText = pathMatch[1].toUpperCase();
+          const index = response.content.indexOf(expectedText);
+          if (index < 0) {
+            reject(new Error(`Missing ${
+              JSON.stringify(expectedText)
+            } text in ${path}`));
+            return;
+          }
+
+          resolve(path);
+        });
+      })));
+    });
+  });
+
+  test.isTrue(promises.length > 0);
+
+  return Promise.all(promises);
+});
+
 Tinytest.addAsync(
   "webapp - additional static javascript",
   async function (test) {
diff --git a/scripts/admin/meteor-release-experimental.json b/scripts/admin/meteor-release-experimental.json
index c147c2b4ee..873da558e9 100644
--- a/scripts/admin/meteor-release-experimental.json
+++ b/scripts/admin/meteor-release-experimental.json
@@ -1,6 +1,6 @@
 {
   "track": "METEOR",
-  "version": "1.7.0.1-rc.0",
+  "version": "1.7.0.3-rc.0",
   "recommended": false,
   "official": false,
   "description": "Meteor"
diff --git a/scripts/admin/meteor-release-official.json b/scripts/admin/meteor-release-official.json
index 157fda3798..2716086cd7 100644
--- a/scripts/admin/meteor-release-official.json
+++ b/scripts/admin/meteor-release-official.json
@@ -1,10 +1,12 @@
 {
   "track": "METEOR",
-  "version": "1.7.0.1",
+  "version": "1.7.0.3",
   "recommended": false,
   "official": true,
   "patchFrom": [
-    "1.7"
+    "1.7",
+    "1.7.0.1",
+    "1.7.0.2"
   ],
   "description": "The Official Meteor Distribution"
 }
diff --git a/scripts/build-dev-bundle-common.sh b/scripts/build-dev-bundle-common.sh
index d067c52c7f..696cbc77bb 100644
--- a/scripts/build-dev-bundle-common.sh
+++ b/scripts/build-dev-bundle-common.sh
@@ -5,7 +5,7 @@ set -u
 
 UNAME=$(uname)
 ARCH=$(uname -m)
-NODE_VERSION=8.11.2
+NODE_VERSION=8.11.3
 MONGO_VERSION_64BIT=3.6.4
 MONGO_VERSION_32BIT=3.2.19
 NPM_VERSION=5.10.0
diff --git a/scripts/dev-bundle-tool-package.js b/scripts/dev-bundle-tool-package.js
index e564b87bb0..e146991018 100644
--- a/scripts/dev-bundle-tool-package.js
+++ b/scripts/dev-bundle-tool-package.js
@@ -14,13 +14,13 @@ var packageJson = {
     pacote: "https://github.com/meteor/pacote/tarball/2c16c509074bbba8ca5dd410caf808412ce79e6c",
     "node-gyp": "3.6.2",
     "node-pre-gyp": "0.6.36",
-    "meteor-babel": "7.0.0-beta.49-1",
+    "meteor-babel": "7.0.0-beta.51",
     "meteor-promise": "0.8.6",
     promise: "8.0.1",
     reify: "0.16.2",
     fibers: "2.0.0",
     // So that Babel can emit require("@babel/runtime/helpers/...") calls.
-    "@babel/runtime": "7.0.0-beta.49",
+    "@babel/runtime": "7.0.0-beta.51",
     // For backwards compatibility with isopackets that still depend on
     // babel-runtime rather than @babel/runtime.
     "babel-runtime": "7.0.0-beta.3",
@@ -53,7 +53,7 @@ var packageJson = {
     multipipe: "2.0.1",
     pathwatcher: "7.1.1",
     optimism: "0.6.3",
-    'lru-cache': '4.1.1'
+    'lru-cache': '4.1.3'
   }
 };
 
diff --git a/tools/isobuild/compiler-plugin.js b/tools/isobuild/compiler-plugin.js
index 023a7c03e4..0eb33129bb 100644
--- a/tools/isobuild/compiler-plugin.js
+++ b/tools/isobuild/compiler-plugin.js
@@ -23,6 +23,8 @@ import {
 
 import { isTestFilePath } from './test-files.js';
 
+const hasOwn = Object.prototype.hasOwnProperty;
+
 // This file implements the new compiler plugins added in Meteor 1.2, which are
 // registered with the Plugin.registerCompiler API.
 //
@@ -221,6 +223,11 @@ class InputFile extends buildPluginModule.InputFile {
     // Map from imported module identifier strings (possibly relative) to
     // fully require.resolve'd module identifiers.
     this._resolveCache = Object.create(null);
+
+    // Communicate to compiler plugins that methods like addJavaScript
+    // accept a lazy finalizer function as a second argument, so that
+    // compilation can be avoided until/unless absolutely necessary.
+    this.supportsLazyCompilation = true;
   }
 
   getContentsAsBuffer() {
@@ -445,16 +452,16 @@ class InputFile extends buildPluginModule.InputFile {
    * @param {String|Object} options.sourceMap A stringified JSON
    * sourcemap, in case the stylesheet was generated from a different
    * file.
+   * @param {Function} lazyFinalizer Optional function that can be called
+   *                   to obtain any remaining options that may be
+   *                   expensive to compute, and thus should only be
+   *                   computed if/when we are sure this CSS will be used
+   *                   by the application.
    * @memberOf InputFile
    * @instance
    */
-  addStylesheet(options) {
-    var self = this;
-    if (options.sourceMap && typeof options.sourceMap === 'string') {
-      // XXX remove an anti-XSSI header? ")]}'\n"
-      options.sourceMap = JSON.parse(options.sourceMap);
-    }
-    self._resourceSlot.addStylesheet(options);
+  addStylesheet(options, lazyFinalizer) {
+    this._resourceSlot.addStylesheet(options, lazyFinalizer);
   }
 
   /**
@@ -470,16 +477,16 @@ class InputFile extends buildPluginModule.InputFile {
    * @param {String|Object} options.sourceMap A stringified JSON
    * sourcemap, in case the JavaScript file was generated from a
    * different file.
+   * @param {Function} lazyFinalizer Optional function that can be called
+   *                   to obtain any remaining options that may be
+   *                   expensive to compute, and thus should only be
+   *                   computed if/when we are sure this JavaScript will
+   *                   be used by the application.
    * @memberOf InputFile
    * @instance
    */
-  addJavaScript(options) {
-    var self = this;
-    if (options.sourceMap && typeof options.sourceMap === 'string') {
-      // XXX remove an anti-XSSI header? ")]}'\n"
-      options.sourceMap = JSON.parse(options.sourceMap);
-    }
-    self._resourceSlot.addJavaScript(options);
+  addJavaScript(options, lazyFinalizer) {
+    this._resourceSlot.addJavaScript(options, lazyFinalizer);
   }
 
   /**
@@ -493,12 +500,24 @@ class InputFile extends buildPluginModule.InputFile {
    * file.
    * @param {String} [options.hash] Optionally, supply a hash for the output
    * file.
+   * @param {Function} lazyFinalizer Optional function that can be called
+   *                   to obtain any remaining options that may be
+   *                   expensive to compute, and thus should only be
+   *                   computed if/when we are sure this asset will be
+   *                   used by the application.
    * @memberOf InputFile
    * @instance
    */
-  addAsset(options) {
-    var self = this;
-    self._resourceSlot.addAsset(options);
+  addAsset(options, lazyFinalizer) {
+    if (typeof lazyFinalizer === "function") {
+      // For now, just call the lazyFinalizer function immediately. Since
+      // assets typically are not compiled, this immediate invocation is
+      // probably permanently appropriate for addAsset, whereas methods
+      // like addJavaScript benefit from waiting to call lazyFinalizer.
+      Object.assign(options, Promise.await(lazyFinalizer()));
+    }
+
+    this._resourceSlot.addAsset(options);
   }
 
   /**
@@ -508,12 +527,24 @@ class InputFile extends buildPluginModule.InputFile {
    * @param {String} options.section Which section of the document should
    * be appended to. Can only be "head" or "body".
    * @param {String} options.data The content to append.
+   * @param {Function} lazyFinalizer Optional function that can be called
+   *                   to obtain any remaining options that may be
+   *                   expensive to compute, and thus should only be
+   *                   computed if/when we are sure this HTML will be used
+   *                   by the application.
    * @memberOf InputFile
    * @instance
    */
   addHtml(options) {
-    var self = this;
-    self._resourceSlot.addHtml(options);
+    if (typeof lazyFinalizer === "function") {
+      // For now, just call the lazyFinalizer function immediately. Since
+      // HTML is not compiled, this immediate invocation is probably
+      // permanently appropriate for addHtml, whereas methods like
+      // addJavaScript benefit from waiting to call lazyFinalizer.
+      Object.assign(options, Promise.await(lazyFinalizer()));
+    }
+
+    this._resourceSlot.addHtml(options);
   }
 
   _reportError(message, info) {
@@ -544,6 +575,8 @@ class ResourceSlot {
     self.outputResources = [];
     // JS, which gets linked together at the end.
     self.jsOutputResources = [];
+    // Errors encountered while processing this resource.
+    self.errors = [];
     self.sourceProcessor = sourceProcessor;
     self.packageSourceBatch = packageSourceBatch;
 
@@ -679,100 +712,72 @@ class ResourceSlot {
     return isInImports;
   }
 
-  addStylesheet(options) {
-    const self = this;
-    if (! self.sourceProcessor) {
+  addStylesheet(options, lazyFinalizer) {
+    if (! this.sourceProcessor) {
       throw Error("addStylesheet on non-source ResourceSlot?");
     }
 
-    const data = files.convertToStandardLineEndings(options.data);
-    const useMeteorInstall = self.packageSourceBatch.useMeteorInstall;
-    const sourcePath = this.inputResource.path;
-    const targetPath = options.path || sourcePath;
-    const resource = {
-      refreshable: true,
-      sourcePath,
-      targetPath,
-      servePath: self.packageSourceBatch.unibuild.pkg._getServePath(targetPath),
-      hash: sha1(data),
-      lazy: this._isLazy(options, false),
-    };
+    // In contrast to addJavaScript, CSS resources passed to addStylesheet
+    // default to being eager (non-lazy).
+    options.lazy = this._isLazy(options, false);
 
-    if (useMeteorInstall && resource.lazy) {
+    if (this.packageSourceBatch.useMeteorInstall &&
+        options.lazy) {
       // If the current packageSourceBatch supports modules, and this CSS
       // file is lazy, add it as a lazy JS module instead of adding it
       // unconditionally as a CSS resource, so that it can be imported
       // when needed.
-      resource.type = "js";
-      resource.data =
-        Buffer.from(cssToCommonJS(data, resource.hash), "utf8");
+      this.addJavaScript(options, async () => {
+        const result = typeof lazyFinalizer === "function"
+          ? await lazyFinalizer()
+          : { data: options.data };
 
-      self.jsOutputResources.push(resource);
+        if (result) {
+          result.data = Buffer.from(cssToCommonJS(result.data), "utf8");
+        }
+
+        return result;
+      });
 
     } else {
       // Eager CSS is added unconditionally to a combined <style> tag at
       // the beginning of the <head>. If the corresponding module ever
       // gets imported, its module.exports object should be an empty stub,
       // rather than a <style> node added dynamically to the <head>.
-      self.jsOutputResources.push({
-        ...resource,
-        type: "js",
+      this.addJavaScript({
+        ...options,
         data: Buffer.from(
           "// These styles have already been applied to the document.\n",
           "utf8"),
+        lazy: true,
         // If a compiler plugin calls addJavaScript with the same
         // sourcePath, that code should take precedence over this empty
-        // stub, so this property marks the resource as disposable.
-        implicit: true,
-        lazy: true,
-      });
+        // stub, so setting .implicit marks the resource as disposable.
+      }).implicit = true;
 
-      resource.type = "css";
-      resource.data = Buffer.from(data, 'utf8'),
-
-      // XXX do we need to call convertSourceMapPaths here like we did
-      //     in legacy handlers?
-      resource.sourceMap = options.sourceMap;
-
-      self.outputResources.push(resource);
+      this.outputResources.push(new CssOutputResource({
+        resourceSlot: this,
+        options,
+        lazyFinalizer,
+      }));
     }
   }
 
-  addJavaScript(options) {
-    const self = this;
+  addJavaScript(options, lazyFinalizer) {
     // #HardcodeJs this gets called by constructor in the "js" case
-    if (! self.sourceProcessor && self.inputResource.extension !== "js") {
+    if (! this.sourceProcessor && this.inputResource.extension !== "js") {
       throw Error("addJavaScript on non-source ResourceSlot?");
     }
 
-    let sourcePath = self.inputResource.path;
-    if (_.has(options, "sourcePath") &&
-        typeof options.sourcePath === "string") {
-      sourcePath = options.sourcePath;
-    }
-
-    const targetPath = options.path || sourcePath;
-
-    var data = Buffer.from(
-      files.convertToStandardLineEndings(options.data), 'utf8');
-
-    self.jsOutputResources.push({
-      type: "js",
-      data: data,
-      sourcePath,
-      targetPath,
-      servePath: self.packageSourceBatch.unibuild.pkg._getServePath(targetPath),
-      // XXX should we allow users to be trusted and specify a hash?
-      hash: sha1(data),
-      // XXX do we need to call convertSourceMapPaths here like we did
-      //     in legacy handlers?
-      sourceMap: options.sourceMap,
-      // intentionally preserve a possible `undefined` value for files
-      // in apps, rather than convert it into `false` via `!!`
-      lazy: self._isLazy(options, true),
-      bare: !! self._getOption("bare", options),
-      mainModule: !! self._getOption("mainModule", options),
+    const resource = new JsOutputResource({
+      resourceSlot: this,
+      options,
+      lazyFinalizer,
     });
+
+    this.jsOutputResources.push(resource);
+
+    return resource;
   }
 
   addAsset(options) {
@@ -827,20 +832,141 @@ class ResourceSlot {
 
   addError(message, info) {
     // If this file is ever actually imported, only then will we report
-    // the error. Use this.jsOutputResources because that's what the
-    // ImportScanner deals with.
-    this.jsOutputResources.push({
-      type: "js",
-      sourcePath: this.inputResource.path,
-      targetPath: this.inputResource.path,
-      servePath: this.inputResource.path,
-      data: Buffer.from(
-        "throw new Error(" + JSON.stringify(message) + ");\n",
-        "utf8"),
-      lazy: true,
-      error: { message, info },
+    // the error.
+    this.errors.push({ message, info });
+  }
+}
+
+class OutputResource {
+  constructor({
+    type,
+    resourceSlot,
+    options = Object.create(null),
+    lazyFinalizer = null,
+  }) {
+    this._lazyFinalizer = lazyFinalizer;
+    this._initialOptions = options;
+    this._finalizerPromise = null;
+    // Share the errors array of the resourceSlot.
+    this._errors = resourceSlot.errors;
+
+    let sourcePath = resourceSlot.inputResource.path;
+    if (_.has(options, "sourcePath") &&
+        typeof options.sourcePath === "string") {
+      sourcePath = options.sourcePath;
+    }
+
+    const targetPath = options.path || sourcePath;
+
+    Object.assign(this, {
+      type,
+      lazy: resourceSlot._isLazy(options, true),
+      bare: !! resourceSlot._getOption("bare", options),
+      mainModule: !! resourceSlot._getOption("mainModule", options),
+      sourcePath,
+      targetPath,
+      servePath: resourceSlot.packageSourceBatch
+        .unibuild.pkg._getServePath(targetPath),
     });
   }
+
+  finalize() {
+    if (this._finalizerPromise) {
+      this._finalizerPromise.await();
+    } else if (this._lazyFinalizer) {
+      const finalize = this._lazyFinalizer;
+      this._lazyFinalizer = null;
+      (this._finalizerPromise = new Promise(
+        resolve => resolve(finalize())
+      ).then(result => {
+        Object.assign(this._initialOptions, result);
+        this._finalizerPromise = null;
+      })).await();
+    }
+  }
+
+  reportPendingErrors() {
+    this.finalize();
+    const count = this._errors.length;
+    if (count > 0) {
+      const firstError = this._errors[0];
+      buildmessage.error(
+        firstError.message,
+        firstError.info
+      );
+    }
+    return count;
+  }
+
+  get data() { return this._get("data"); }
+  set data(value) { return this._set("data", value); }
+
+  get hash() { return this._get("hash"); }
+  set hash(value) { return this._set("hash", value); }
+
+  get sourceMap() { return this._get("sourceMap"); }
+  set sourceMap(value) { return this._set("sourceMap", value); }
+
+  // Method for getting properties that may be computed lazily, or that
+  // require some one-time post-processing.
+  _get(name) {
+    if (hasOwn.call(this, name)) {
+      return this[name];
+    }
+
+    this.finalize();
+
+    switch (name) {
+    case "data":
+      let { data } = this._initialOptions;
+      if (! Buffer.isBuffer(data)) {
+        data = Buffer.from(data, "utf8");
+      }
+      return this._set("data", data);
+
+    case "hash":
+      const { hash } = this._initialOptions;
+      return this._set("hash", hash || sha1(this._get("data")));
+
+    case "sourceMap":
+      let { sourceMap } = this._initialOptions;
+      if (sourceMap && typeof sourceMap === "string") {
+        sourceMap = JSON.parse(sourceMap);
+      }
+      return this._set("sourceMap", sourceMap);
+    }
+
+    if (! hasOwn.call(this._initialOptions, name)) {
+      throw new Error(`Unknown JsOutputResource property: ${name}`);
+    }
+
+    return this[name] = this._initialOptions[name];
+  }
+
+  // This method must be used to set any properties that have a getter
+  // defined above (data, hash, sourceMap).
+  _set(name, value) {
+    Object.defineProperty(this, name, {
+      value,
+      enumerable: true,
+      writable: true,
+      configurable: true,
+    });
+    return value;
+  }
+}
+
+class JsOutputResource extends OutputResource {
+  constructor(options) {
+    super({ ...options, type: "js" });
+  }
+}
+
+class CssOutputResource extends OutputResource {
+  constructor(options) {
+    super({ ...options, type: "css" });
+    this.refreshable = true;
+  }
 }
 
 export class PackageSourceBatch {
diff --git a/tools/isobuild/import-scanner.js b/tools/isobuild/import-scanner.js
index dca37871a0..523274d9fe 100644
--- a/tools/isobuild/import-scanner.js
+++ b/tools/isobuild/import-scanner.js
@@ -249,19 +249,6 @@ export default class ImportScanner {
       // something plausible. #6411 #6383
       const absPath = pathJoin(this.sourceRoot, file.sourcePath);
 
-      const dotExt = "." + file.type;
-      const dataString = file.data.toString("utf8");
-      file.dataString = defaultExtensionHandlers[dotExt].call(
-        file,
-        dataString,
-        file.hash,
-      );
-
-      if (! (file.data instanceof Buffer) ||
-          file.dataString !== dataString) {
-        file.data = Buffer.from(file.dataString, "utf8");
-      }
-
       // This property can have values false, true, "dynamic" (which
       // indicates that the file has been imported, but only dynamically).
       file.imported = false;
@@ -302,9 +289,10 @@ export default class ImportScanner {
     const files = this.realPathToFiles[realPath];
     if (files && files.length > 0) {
       const firstFile = files[0];
+      const dataString = this._getDataString(firstFile);
       return {
         data: firstFile.data,
-        dataString: firstFile.dataString,
+        dataString: dataString,
         hash: firstFile.hash,
       };
     }
@@ -417,7 +405,7 @@ export default class ImportScanner {
       // plugin calling inputFile.addJavaScript multiple times for the
       // same source file (see discussion in #9176), with different target
       // paths, code, laziness, etc.
-      sourceFile.dataString += [
+      sourceFile.dataString = this._getDataString(sourceFile) + [
         "module.watch(require(" + JSON.stringify(relativeId) + "), {",
         '  "*": module.makeNsSetter(true)',
         "});",
@@ -437,6 +425,8 @@ export default class ImportScanner {
   // maps and updating all other properties appropriately. Once this
   // combination is done, oldFile should be kept and newFile discarded.
   _combineFiles(oldFile, newFile) {
+    const scanner = this;
+
     function checkProperty(name) {
       if (has(oldFile, name)) {
         if (! has(newFile, name)) {
@@ -469,8 +459,11 @@ export default class ImportScanner {
       const consumer = file.sourceMap &&
         new SourceMapConsumer(file.sourceMap);
       const node = consumer &&
-        SourceNode.fromStringWithSourceMap(file.dataString, consumer);
-      return node || file.dataString;
+        SourceNode.fromStringWithSourceMap(
+          scanner._getDataString(file),
+          consumer
+        );
+      return node || scanner._getDataString(file);
     }
 
     const {
@@ -728,7 +721,7 @@ export default class ImportScanner {
     }
 
     const result = findImportedModuleIdentifiers(
-      file.dataString,
+      this._getDataString(file),
       file.hash,
     );
 
@@ -825,14 +818,11 @@ export default class ImportScanner {
     // Set file.imported to a truthy value (either "dynamic" or true).
     file.imported = forDynamicImport ? "dynamic" : true;
 
-    if (file.error) {
+    if (file.reportPendingErrors &&
+        file.reportPendingErrors() > 0) {
       // Any errors reported to InputFile#error were saved but not
       // reported at compilation time. Now that we know the file has been
       // imported, it's time to report those errors.
-      buildmessage.error(
-        file.error.message,
-        file.error.info
-      );
       return;
     }
 
@@ -913,6 +903,27 @@ export default class ImportScanner {
     return archMatches(this.bundleArch, "web.browser");
   }
 
+  _getDataString(file) {
+    if (typeof file.dataString === "string") {
+      return file.dataString;
+    }
+
+    const dotExt = "." + file.type;
+    const dataString = file.data.toString("utf8");
+    file.dataString = defaultExtensionHandlers[dotExt].call(
+      file,
+      dataString,
+      file.hash,
+    );
+
+    if (! (file.data instanceof Buffer) ||
+        file.dataString !== dataString) {
+      file.data = Buffer.from(file.dataString, "utf8");
+    }
+
+    return file.dataString;
+  }
+
   _readFile(absPath) {
     const contents = optimisticReadFile(absPath);
     const hash = optimisticHashOrNull(absPath);
diff --git a/tools/isobuild/package-source.js b/tools/isobuild/package-source.js
index 18a39c3322..4912e71993 100644
--- a/tools/isobuild/package-source.js
+++ b/tools/isobuild/package-source.js
@@ -889,6 +889,7 @@ _.extend(PackageSource.prototype, {
             sourceArch: this,
             ignoreFiles,
             isApp: true,
+            testModule,
           };
 
           // If this architecture has a mainModule defined in
@@ -1025,8 +1026,9 @@ _.extend(PackageSource.prototype, {
         return fileOptions;
       }
 
-      // Files in `imports/` should be lazily loaded *apart* from tests
-      if (dir === "imports" && ! isTestFile) {
+      // Files in `imports/` and `tests/` directories should be lazily
+      // loaded *apart* from tests.
+      if ((dir === "imports" || dir === "tests") && ! isTestFile) {
         fileOptions.lazy = true;
       }
 
@@ -1080,6 +1082,7 @@ _.extend(PackageSource.prototype, {
     watchSet,
     isApp,
     sourceArch,
+    testModule,
     loopChecker = new SymlinkLoopChecker(this.sourceRoot),
     ignoreFiles = []
   }) {
@@ -1102,10 +1105,10 @@ _.extend(PackageSource.prototype, {
     // Unless we're running tests, ignore all test filenames and if we are, ignore the
     // type of file we *aren't* running
     if (!global.testCommandMetadata || global.testCommandMetadata.isTest) {
-      Array.prototype.push.apply(sourceReadOptions.exclude, APP_TEST_FILENAME_REGEXPS);
+      sourceReadOptions.exclude.push(...APP_TEST_FILENAME_REGEXPS);
     }
     if (!global.testCommandMetadata || global.testCommandMetadata.isAppTest) {
-      Array.prototype.push.apply(sourceReadOptions.exclude, TEST_FILENAME_REGEXPS);
+      sourceReadOptions.exclude.push(...TEST_FILENAME_REGEXPS);
     }
 
     // Read top-level source files, excluding control files that were not
@@ -1116,13 +1119,21 @@ _.extend(PackageSource.prototype, {
       controlFiles.push('package.js');
     }
 
-    const anyLevelExcludes = [
-      /^tests\/$/,
+    const anyLevelExcludes = [];
+
+    // If we have a meteor.testModule from package.json, then we don't
+    // need to exclude tests/ directories from the search, because we
+    // trust meteor.testModule to identify a single test entry point.
+    if (! testModule) {
+      anyLevelExcludes.push(/^tests\/$/);
+    }
+
+    anyLevelExcludes.push(
       archinfo.matches(arch, "os")
         ? /^client\/$/
         : /^server\/$/,
       ...sourceReadOptions.exclude,
-    ];
+    );
 
     const topLevelExcludes = isApp ? [
       ...anyLevelExcludes,
diff --git a/tools/static-assets/skel-bare/package.json b/tools/static-assets/skel-bare/package.json
index 2e37aabef5..8130f4fbb0 100644
--- a/tools/static-assets/skel-bare/package.json
+++ b/tools/static-assets/skel-bare/package.json
@@ -5,7 +5,7 @@
     "start": "meteor run"
   },
   "dependencies": {
-    "@babel/runtime": "^7.0.0-beta.48",
+    "@babel/runtime": "^7.0.0-beta.51",
     "meteor-node-stubs": "^0.4.1"
   }
 }
diff --git a/tools/static-assets/skel-full/package.json b/tools/static-assets/skel-full/package.json
index fd879eaf31..22e35ceded 100644
--- a/tools/static-assets/skel-full/package.json
+++ b/tools/static-assets/skel-full/package.json
@@ -6,7 +6,7 @@
     "test": "meteor test --once --driver-package meteortesting:mocha"
   },
   "dependencies": {
-    "@babel/runtime": "^7.0.0-beta.48",
+    "@babel/runtime": "^7.0.0-beta.51",
     "meteor-node-stubs": "^0.4.1"
   },
   "devDependencies": {
diff --git a/tools/static-assets/skel-minimal/package.json b/tools/static-assets/skel-minimal/package.json
index bd24b879b6..c6f65ba737 100644
--- a/tools/static-assets/skel-minimal/package.json
+++ b/tools/static-assets/skel-minimal/package.json
@@ -8,7 +8,7 @@
     "visualize": "meteor --production --extra-packages bundle-visualizer"
   },
   "dependencies": {
-    "@babel/runtime": "^7.0.0-beta.48",
+    "@babel/runtime": "^7.0.0-beta.51",
     "meteor-node-stubs": "^0.4.1"
   },
   "meteor": {
@@ -16,6 +16,6 @@
       "client": "client/main.js",
       "server": "server/main.js"
     },
-    "testModule": "test/main.js"
+    "testModule": "tests/main.js"
   }
 }
diff --git a/tools/static-assets/skel-minimal/test/main.js b/tools/static-assets/skel-minimal/tests/main.js
similarity index 100%
rename from tools/static-assets/skel-minimal/test/main.js
rename to tools/static-assets/skel-minimal/tests/main.js
diff --git a/tools/static-assets/skel/package.json b/tools/static-assets/skel/package.json
index bd24b879b6..c6f65ba737 100644
--- a/tools/static-assets/skel/package.json
+++ b/tools/static-assets/skel/package.json
@@ -8,7 +8,7 @@
     "visualize": "meteor --production --extra-packages bundle-visualizer"
   },
   "dependencies": {
-    "@babel/runtime": "^7.0.0-beta.48",
+    "@babel/runtime": "^7.0.0-beta.51",
     "meteor-node-stubs": "^0.4.1"
   },
   "meteor": {
@@ -16,6 +16,6 @@
       "client": "client/main.js",
       "server": "server/main.js"
     },
-    "testModule": "test/main.js"
+    "testModule": "tests/main.js"
   }
 }
diff --git a/tools/static-assets/skel/test/main.js b/tools/static-assets/skel/tests/main.js
similarity index 100%
rename from tools/static-assets/skel/test/main.js
rename to tools/static-assets/skel/tests/main.js
diff --git a/tools/tests/apps/dynamic-import/.meteor/.finished-upgraders b/tools/tests/apps/dynamic-import/.meteor/.finished-upgraders
index 910574ce2d..4538749ab8 100644
--- a/tools/tests/apps/dynamic-import/.meteor/.finished-upgraders
+++ b/tools/tests/apps/dynamic-import/.meteor/.finished-upgraders
@@ -15,3 +15,4 @@ notices-for-facebook-graph-api-2
 1.4.1-add-shell-server-package
 1.4.3-split-account-service-packages
 1.5-add-dynamic-import-package
+1.7-split-underscore-from-meteor-base
diff --git a/tools/tests/apps/dynamic-import/.meteor/packages b/tools/tests/apps/dynamic-import/.meteor/packages
index d705b9dbce..c99031ebff 100644
--- a/tools/tests/apps/dynamic-import/.meteor/packages
+++ b/tools/tests/apps/dynamic-import/.meteor/packages
@@ -4,23 +4,24 @@
 # 'meteor add' and 'meteor remove' will edit this file for you,
 # but you can also edit it by hand.
 
-meteor-base@1.3.0             # Packages every Meteor app needs to have
+meteor-base@1.4.0             # Packages every Meteor app needs to have
 mobile-experience@1.0.5       # Packages for a great mobile UX
-mongo@1.4.2                   # The database Meteor supports right now
+mongo@1.5.0                   # The database Meteor supports right now
 blaze-html-templates@1.0.4 # Compile .html files into Meteor Blaze views
 reactive-var@1.0.11            # Reactive variable for tracker
 jquery@1.11.10                  # Helpful client-side library
-tracker@1.1.3                 # Meteor's client-side reactive programming library
+tracker@1.2.0                 # Meteor's client-side reactive programming library
 
-standard-minifier-css@1.4.0   # CSS minifier run for production mode
-standard-minifier-js@2.3.1    # JS minifier run for production mode
-es5-shim@4.7.0                # ECMAScript 5 compatibility for older browsers.
-ecmascript@0.10.0              # Enable ECMAScript2015+ syntax in app code
+standard-minifier-css@1.4.1   # CSS minifier run for production mode
+standard-minifier-js@2.3.4    # JS minifier run for production mode
+es5-shim@4.8.0                # ECMAScript 5 compatibility for older browsers.
+ecmascript@0.11.0              # Enable ECMAScript2015+ syntax in app code
 shell-server@0.3.1            # Server-side component of the `meteor shell` command
 
 autopublish@1.0.7             # Publish all data to the clients (for prototyping)
 insecure@1.0.7                # Allow all DB writes from clients (for prototyping)
-dynamic-import@0.3.0
+dynamic-import@0.4.0
 lazy-test-package
 helper-package
 user:colon-name
+underscore
diff --git a/tools/tests/apps/dynamic-import/.meteor/release b/tools/tests/apps/dynamic-import/.meteor/release
index d502dc0d92..7f956de292 100644
--- a/tools/tests/apps/dynamic-import/.meteor/release
+++ b/tools/tests/apps/dynamic-import/.meteor/release
@@ -1 +1 @@
-METEOR@1.6.1
+METEOR@1.7.0.1
diff --git a/tools/tests/apps/dynamic-import/.meteor/versions b/tools/tests/apps/dynamic-import/.meteor/versions
new file mode 100644
index 0000000000..0d014bc9d2
--- /dev/null
+++ b/tools/tests/apps/dynamic-import/.meteor/versions
@@ -0,0 +1,82 @@
+allow-deny@1.1.0
+autopublish@1.0.7
+autoupdate@1.4.0
+babel-compiler@7.1.0
+babel-runtime@1.2.2
+base64@1.0.11
+binary-heap@1.0.10
+blaze@2.3.2
+blaze-html-templates@1.1.2
+blaze-tools@1.0.10
+boilerplate-generator@1.5.0
+caching-compiler@1.1.12
+caching-html-compiler@1.1.2
+callback-hook@1.1.0
+check@1.3.1
+coffeescript@2.2.1_1
+coffeescript-compiler@2.2.1_1
+ddp@1.4.0
+ddp-client@2.3.2
+ddp-common@1.4.0
+ddp-server@2.2.0
+deps@1.0.12
+diff-sequence@1.1.0
+dynamic-import@0.4.0
+ecmascript@0.11.0
+ecmascript-runtime@0.7.0
+ecmascript-runtime-client@0.7.1
+ecmascript-runtime-server@0.7.0
+ejson@1.1.0
+es5-shim@4.8.0
+geojson-utils@1.0.10
+helper-package@0.0.1
+hot-code-push@1.0.4
+html-tools@1.0.11
+htmljs@1.0.11
+http@1.4.1
+id-map@1.1.0
+insecure@1.0.7
+jquery@1.11.11
+launch-screen@1.1.1
+lazy-test-package@0.0.1
+livedata@1.0.18
+logging@1.1.20
+meteor@1.9.0
+meteor-base@1.4.0
+minifier-css@1.3.1
+minifier-js@2.3.5
+minimongo@1.4.4
+mobile-experience@1.0.5
+mobile-status-bar@1.0.14
+modern-browsers@0.1.1
+modules@0.12.0
+modules-runtime@0.10.0
+mongo@1.5.0
+mongo-dev-server@1.1.0
+mongo-id@1.0.7
+npm-mongo@3.0.7
+observe-sequence@1.0.16
+ordered-dict@1.1.0
+promise@0.11.1
+random@1.1.0
+reactive-var@1.0.11
+reload@1.2.0
+retry@1.1.0
+routepolicy@1.0.13
+shell-server@0.3.1
+socket-stream-client@0.2.1
+spacebars@1.0.15
+spacebars-compiler@1.1.3
+standard-minifier-css@1.4.1
+standard-minifier-js@2.3.4
+templating@1.3.2
+templating-compiler@1.3.3
+templating-runtime@1.3.2
+templating-tools@1.1.2
+tracker@1.2.0
+ui@1.0.13
+underscore@1.0.10
+url@1.2.0
+user:colon-name@0.0.1
+webapp@1.6.0
+webapp-hashing@1.0.9
diff --git a/tools/tests/apps/dynamic-import/package-lock.json b/tools/tests/apps/dynamic-import/package-lock.json
index 721cdb5c08..b98b62b6b0 100644
--- a/tools/tests/apps/dynamic-import/package-lock.json
+++ b/tools/tests/apps/dynamic-import/package-lock.json
@@ -4,12 +4,12 @@
   "lockfileVersion": 1,
   "dependencies": {
     "@babel/runtime": {
-      "version": "7.0.0-beta.46",
-      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.0.0-beta.46.tgz",
-      "integrity": "sha512-/3a3USMKk54BEHhDgY8rtxtaQOs4bp4aQwo6SDtdwmrXmgSgEusWuXNX5oIs/nwzmTD9o8wz2EyAjA+uHDMmJA==",
+      "version": "7.0.0-beta.49",
+      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.0.0-beta.49.tgz",
+      "integrity": "sha1-A7O/B+uYIHLI6FHdLd1RECguYb8=",
       "requires": {
-        "core-js": "2.5.6",
-        "regenerator-runtime": "0.11.1"
+        "core-js": "^2.5.6",
+        "regenerator-runtime": "^0.11.1"
       }
     },
     "acorn": {
@@ -76,9 +76,9 @@
       }
     },
     "core-js": {
-      "version": "2.5.6",
-      "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.5.6.tgz",
-      "integrity": "sha512-lQUVfQi0aLix2xpyjrrJEvfuYCqPc/HwmTKsC/VNf8q0zsjX7SQZtp4+oRONN5Tsur9GDETPjj+Ub2iDiGZfSQ=="
+      "version": "2.5.7",
+      "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.5.7.tgz",
+      "integrity": "sha512-RszJCAxg/PP6uzXVXL6BsxSXx/B05oJAQ2vkJRjyjrEcNVycaqOmNb5OTxZPE3xa5gwZduqza6L9JOCenh/Ecw=="
     },
     "core-util-is": {
       "version": "1.0.2",
@@ -272,28 +272,28 @@
       "resolved": "https://registry.npmjs.org/meteor-node-stubs/-/meteor-node-stubs-0.4.1.tgz",
       "integrity": "sha512-UO2OStvLOKoApmOdIP5eCqoLaa/ritMXRg4ffJVdkNLEsczzPvTjgC0Mxk4cM4R8MZkwll90FYgjDf5qUTJdMA==",
       "requires": {
-        "assert": "1.4.1",
-        "browserify-zlib": "0.1.4",
-        "buffer": "4.9.1",
-        "console-browserify": "1.1.0",
-        "constants-browserify": "1.0.0",
-        "crypto-browserify": "3.12.0",
-        "domain-browser": "1.2.0",
-        "events": "1.1.1",
+        "assert": "^1.4.1",
+        "browserify-zlib": "^0.1.4",
+        "buffer": "^4.9.1",
+        "console-browserify": "^1.1.0",
+        "constants-browserify": "^1.0.0",
+        "crypto-browserify": "^3.11.0",
+        "domain-browser": "^1.1.7",
+        "events": "^1.1.1",
         "https-browserify": "0.0.1",
-        "os-browserify": "0.2.1",
+        "os-browserify": "^0.2.1",
         "path-browserify": "0.0.0",
-        "process": "0.11.10",
-        "punycode": "1.4.1",
-        "querystring-es3": "0.2.1",
-        "readable-stream": "2.3.6",
-        "stream-browserify": "2.0.1",
-        "stream-http": "2.8.1",
-        "string_decoder": "1.1.1",
-        "timers-browserify": "1.4.2",
+        "process": "^0.11.9",
+        "punycode": "^1.4.1",
+        "querystring-es3": "^0.2.1",
+        "readable-stream": "^2.3.6",
+        "stream-browserify": "^2.0.1",
+        "stream-http": "^2.8.0",
+        "string_decoder": "^1.1.0",
+        "timers-browserify": "^1.4.2",
         "tty-browserify": "0.0.0",
-        "url": "0.11.0",
-        "util": "0.10.3",
+        "url": "^0.11.0",
+        "util": "^0.10.3",
         "vm-browserify": "0.0.4"
       },
       "dependencies": {
@@ -301,9 +301,9 @@
           "version": "4.10.1",
           "bundled": true,
           "requires": {
-            "bn.js": "4.11.8",
-            "inherits": "2.0.1",
-            "minimalistic-assert": "1.0.1"
+            "bn.js": "^4.0.0",
+            "inherits": "^2.0.1",
+            "minimalistic-assert": "^1.0.0"
           }
         },
         "assert": {
@@ -329,67 +329,67 @@
           "version": "1.2.0",
           "bundled": true,
           "requires": {
-            "buffer-xor": "1.0.3",
-            "cipher-base": "1.0.4",
-            "create-hash": "1.2.0",
-            "evp_bytestokey": "1.0.3",
-            "inherits": "2.0.1",
-            "safe-buffer": "5.1.2"
+            "buffer-xor": "^1.0.3",
+            "cipher-base": "^1.0.0",
+            "create-hash": "^1.1.0",
+            "evp_bytestokey": "^1.0.3",
+            "inherits": "^2.0.1",
+            "safe-buffer": "^5.0.1"
           }
         },
         "browserify-cipher": {
           "version": "1.0.1",
           "bundled": true,
           "requires": {
-            "browserify-aes": "1.2.0",
-            "browserify-des": "1.0.1",
-            "evp_bytestokey": "1.0.3"
+            "browserify-aes": "^1.0.4",
+            "browserify-des": "^1.0.0",
+            "evp_bytestokey": "^1.0.0"
           }
         },
         "browserify-des": {
           "version": "1.0.1",
           "bundled": true,
           "requires": {
-            "cipher-base": "1.0.4",
-            "des.js": "1.0.0",
-            "inherits": "2.0.1"
+            "cipher-base": "^1.0.1",
+            "des.js": "^1.0.0",
+            "inherits": "^2.0.1"
           }
         },
         "browserify-rsa": {
           "version": "4.0.1",
           "bundled": true,
           "requires": {
-            "bn.js": "4.11.8",
-            "randombytes": "2.0.6"
+            "bn.js": "^4.1.0",
+            "randombytes": "^2.0.1"
           }
         },
         "browserify-sign": {
           "version": "4.0.4",
           "bundled": true,
           "requires": {
-            "bn.js": "4.11.8",
-            "browserify-rsa": "4.0.1",
-            "create-hash": "1.2.0",
-            "create-hmac": "1.1.7",
-            "elliptic": "6.4.0",
-            "inherits": "2.0.1",
-            "parse-asn1": "5.1.1"
+            "bn.js": "^4.1.1",
+            "browserify-rsa": "^4.0.0",
+            "create-hash": "^1.1.0",
+            "create-hmac": "^1.1.2",
+            "elliptic": "^6.0.0",
+            "inherits": "^2.0.1",
+            "parse-asn1": "^5.0.0"
           }
         },
         "browserify-zlib": {
           "version": "0.1.4",
           "bundled": true,
           "requires": {
-            "pako": "0.2.9"
+            "pako": "~0.2.0"
           }
         },
         "buffer": {
           "version": "4.9.1",
           "bundled": true,
           "requires": {
-            "base64-js": "1.3.0",
-            "ieee754": "1.1.11",
-            "isarray": "1.0.0"
+            "base64-js": "^1.0.2",
+            "ieee754": "^1.1.4",
+            "isarray": "^1.0.0"
           }
         },
         "buffer-xor": {
@@ -404,15 +404,15 @@
           "version": "1.0.4",
           "bundled": true,
           "requires": {
-            "inherits": "2.0.1",
-            "safe-buffer": "5.1.2"
+            "inherits": "^2.0.1",
+            "safe-buffer": "^5.0.1"
           }
         },
         "console-browserify": {
           "version": "1.1.0",
           "bundled": true,
           "requires": {
-            "date-now": "0.1.4"
+            "date-now": "^0.1.4"
           }
         },
         "constants-browserify": {
@@ -427,48 +427,48 @@
           "version": "4.0.3",
           "bundled": true,
           "requires": {
-            "bn.js": "4.11.8",
-            "elliptic": "6.4.0"
+            "bn.js": "^4.1.0",
+            "elliptic": "^6.0.0"
           }
         },
         "create-hash": {
           "version": "1.2.0",
           "bundled": true,
           "requires": {
-            "cipher-base": "1.0.4",
-            "inherits": "2.0.1",
-            "md5.js": "1.3.4",
-            "ripemd160": "2.0.2",
-            "sha.js": "2.4.11"
+            "cipher-base": "^1.0.1",
+            "inherits": "^2.0.1",
+            "md5.js": "^1.3.4",
+            "ripemd160": "^2.0.1",
+            "sha.js": "^2.4.0"
           }
         },
         "create-hmac": {
           "version": "1.1.7",
           "bundled": true,
           "requires": {
-            "cipher-base": "1.0.4",
-            "create-hash": "1.2.0",
-            "inherits": "2.0.1",
-            "ripemd160": "2.0.2",
-            "safe-buffer": "5.1.2",
-            "sha.js": "2.4.11"
+            "cipher-base": "^1.0.3",
+            "create-hash": "^1.1.0",
+            "inherits": "^2.0.1",
+            "ripemd160": "^2.0.0",
+            "safe-buffer": "^5.0.1",
+            "sha.js": "^2.4.8"
           }
         },
         "crypto-browserify": {
           "version": "3.12.0",
           "bundled": true,
           "requires": {
-            "browserify-cipher": "1.0.1",
-            "browserify-sign": "4.0.4",
-            "create-ecdh": "4.0.3",
-            "create-hash": "1.2.0",
-            "create-hmac": "1.1.7",
-            "diffie-hellman": "5.0.3",
-            "inherits": "2.0.1",
-            "pbkdf2": "3.0.16",
-            "public-encrypt": "4.0.2",
-            "randombytes": "2.0.6",
-            "randomfill": "1.0.4"
+            "browserify-cipher": "^1.0.0",
+            "browserify-sign": "^4.0.0",
+            "create-ecdh": "^4.0.0",
+            "create-hash": "^1.1.0",
+            "create-hmac": "^1.1.0",
+            "diffie-hellman": "^5.0.0",
+            "inherits": "^2.0.1",
+            "pbkdf2": "^3.0.3",
+            "public-encrypt": "^4.0.0",
+            "randombytes": "^2.0.0",
+            "randomfill": "^1.0.3"
           }
         },
         "date-now": {
@@ -479,17 +479,17 @@
           "version": "1.0.0",
           "bundled": true,
           "requires": {
-            "inherits": "2.0.1",
-            "minimalistic-assert": "1.0.1"
+            "inherits": "^2.0.1",
+            "minimalistic-assert": "^1.0.0"
           }
         },
         "diffie-hellman": {
           "version": "5.0.3",
           "bundled": true,
           "requires": {
-            "bn.js": "4.11.8",
-            "miller-rabin": "4.0.1",
-            "randombytes": "2.0.6"
+            "bn.js": "^4.1.0",
+            "miller-rabin": "^4.0.0",
+            "randombytes": "^2.0.0"
           }
         },
         "domain-browser": {
@@ -500,13 +500,13 @@
           "version": "6.4.0",
           "bundled": true,
           "requires": {
-            "bn.js": "4.11.8",
-            "brorand": "1.1.0",
-            "hash.js": "1.1.3",
-            "hmac-drbg": "1.0.1",
-            "inherits": "2.0.1",
-            "minimalistic-assert": "1.0.1",
-            "minimalistic-crypto-utils": "1.0.1"
+            "bn.js": "^4.4.0",
+            "brorand": "^1.0.1",
+            "hash.js": "^1.0.0",
+            "hmac-drbg": "^1.0.0",
+            "inherits": "^2.0.1",
+            "minimalistic-assert": "^1.0.0",
+            "minimalistic-crypto-utils": "^1.0.0"
           }
         },
         "events": {
@@ -517,24 +517,24 @@
           "version": "1.0.3",
           "bundled": true,
           "requires": {
-            "md5.js": "1.3.4",
-            "safe-buffer": "5.1.2"
+            "md5.js": "^1.3.4",
+            "safe-buffer": "^5.1.1"
           }
         },
         "hash-base": {
           "version": "3.0.4",
           "bundled": true,
           "requires": {
-            "inherits": "2.0.1",
-            "safe-buffer": "5.1.2"
+            "inherits": "^2.0.1",
+            "safe-buffer": "^5.0.1"
           }
         },
         "hash.js": {
           "version": "1.1.3",
           "bundled": true,
           "requires": {
-            "inherits": "2.0.3",
-            "minimalistic-assert": "1.0.1"
+            "inherits": "^2.0.3",
+            "minimalistic-assert": "^1.0.0"
           },
           "dependencies": {
             "inherits": {
@@ -547,9 +547,9 @@
           "version": "1.0.1",
           "bundled": true,
           "requires": {
-            "hash.js": "1.1.3",
-            "minimalistic-assert": "1.0.1",
-            "minimalistic-crypto-utils": "1.0.1"
+            "hash.js": "^1.0.3",
+            "minimalistic-assert": "^1.0.0",
+            "minimalistic-crypto-utils": "^1.0.1"
           }
         },
         "https-browserify": {
@@ -576,16 +576,16 @@
           "version": "1.3.4",
           "bundled": true,
           "requires": {
-            "hash-base": "3.0.4",
-            "inherits": "2.0.1"
+            "hash-base": "^3.0.0",
+            "inherits": "^2.0.1"
           }
         },
         "miller-rabin": {
           "version": "4.0.1",
           "bundled": true,
           "requires": {
-            "bn.js": "4.11.8",
-            "brorand": "1.1.0"
+            "bn.js": "^4.0.0",
+            "brorand": "^1.0.1"
           }
         },
         "minimalistic-assert": {
@@ -608,11 +608,11 @@
           "version": "5.1.1",
           "bundled": true,
           "requires": {
-            "asn1.js": "4.10.1",
-            "browserify-aes": "1.2.0",
-            "create-hash": "1.2.0",
-            "evp_bytestokey": "1.0.3",
-            "pbkdf2": "3.0.16"
+            "asn1.js": "^4.0.0",
+            "browserify-aes": "^1.0.0",
+            "create-hash": "^1.1.0",
+            "evp_bytestokey": "^1.0.0",
+            "pbkdf2": "^3.0.3"
           }
         },
         "path-browserify": {
@@ -623,11 +623,11 @@
           "version": "3.0.16",
           "bundled": true,
           "requires": {
-            "create-hash": "1.2.0",
-            "create-hmac": "1.1.7",
-            "ripemd160": "2.0.2",
-            "safe-buffer": "5.1.2",
-            "sha.js": "2.4.11"
+            "create-hash": "^1.1.2",
+            "create-hmac": "^1.1.4",
+            "ripemd160": "^2.0.1",
+            "safe-buffer": "^5.0.1",
+            "sha.js": "^2.4.8"
           }
         },
         "process": {
@@ -642,11 +642,11 @@
           "version": "4.0.2",
           "bundled": true,
           "requires": {
-            "bn.js": "4.11.8",
-            "browserify-rsa": "4.0.1",
-            "create-hash": "1.2.0",
-            "parse-asn1": "5.1.1",
-            "randombytes": "2.0.6"
+            "bn.js": "^4.1.0",
+            "browserify-rsa": "^4.0.0",
+            "create-hash": "^1.1.0",
+            "parse-asn1": "^5.0.0",
+            "randombytes": "^2.0.1"
           }
         },
         "punycode": {
@@ -665,28 +665,28 @@
           "version": "2.0.6",
           "bundled": true,
           "requires": {
-            "safe-buffer": "5.1.2"
+            "safe-buffer": "^5.1.0"
           }
         },
         "randomfill": {
           "version": "1.0.4",
           "bundled": true,
           "requires": {
-            "randombytes": "2.0.6",
-            "safe-buffer": "5.1.2"
+            "randombytes": "^2.0.5",
+            "safe-buffer": "^5.1.0"
           }
         },
         "readable-stream": {
           "version": "2.3.6",
           "bundled": true,
           "requires": {
-            "core-util-is": "1.0.2",
-            "inherits": "2.0.3",
-            "isarray": "1.0.0",
-            "process-nextick-args": "2.0.0",
-            "safe-buffer": "5.1.2",
-            "string_decoder": "1.1.1",
-            "util-deprecate": "1.0.2"
+            "core-util-is": "~1.0.0",
+            "inherits": "~2.0.3",
+            "isarray": "~1.0.0",
+            "process-nextick-args": "~2.0.0",
+            "safe-buffer": "~5.1.1",
+            "string_decoder": "~1.1.1",
+            "util-deprecate": "~1.0.1"
           },
           "dependencies": {
             "inherits": {
@@ -699,8 +699,8 @@
           "version": "2.0.2",
           "bundled": true,
           "requires": {
-            "hash-base": "3.0.4",
-            "inherits": "2.0.1"
+            "hash-base": "^3.0.0",
+            "inherits": "^2.0.1"
           }
         },
         "safe-buffer": {
@@ -711,41 +711,41 @@
           "version": "2.4.11",
           "bundled": true,
           "requires": {
-            "inherits": "2.0.1",
-            "safe-buffer": "5.1.2"
+            "inherits": "^2.0.1",
+            "safe-buffer": "^5.0.1"
           }
         },
         "stream-browserify": {
           "version": "2.0.1",
           "bundled": true,
           "requires": {
-            "inherits": "2.0.1",
-            "readable-stream": "2.3.6"
+            "inherits": "~2.0.1",
+            "readable-stream": "^2.0.2"
           }
         },
         "stream-http": {
           "version": "2.8.1",
           "bundled": true,
           "requires": {
-            "builtin-status-codes": "3.0.0",
-            "inherits": "2.0.1",
-            "readable-stream": "2.3.6",
-            "to-arraybuffer": "1.0.1",
-            "xtend": "4.0.1"
+            "builtin-status-codes": "^3.0.0",
+            "inherits": "^2.0.1",
+            "readable-stream": "^2.3.3",
+            "to-arraybuffer": "^1.0.0",
+            "xtend": "^4.0.0"
           }
         },
         "string_decoder": {
           "version": "1.1.1",
           "bundled": true,
           "requires": {
-            "safe-buffer": "5.1.2"
+            "safe-buffer": "~5.1.0"
           }
         },
         "timers-browserify": {
           "version": "1.4.2",
           "bundled": true,
           "requires": {
-            "process": "0.11.10"
+            "process": "~0.11.0"
           }
         },
         "to-arraybuffer": {
diff --git a/tools/tests/apps/dynamic-import/package.json b/tools/tests/apps/dynamic-import/package.json
index 12937245ba..c53be34091 100644
--- a/tools/tests/apps/dynamic-import/package.json
+++ b/tools/tests/apps/dynamic-import/package.json
@@ -6,7 +6,7 @@
     "test": "TEST_BROWSER_DRIVER=puppeteer meteor test --full-app --driver-package meteortesting:mocha"
   },
   "dependencies": {
-    "@babel/runtime": "^7.0.0-beta.46",
+    "@babel/runtime": "^7.0.0-beta.49",
     "acorn": "^4.0.11",
     "arson": "^0.2.3",
     "meteor-node-stubs": "^0.4.1",