Support __filename and __dirname.

Part of #6055.
Fixes #6022.

packages/modules-runtime/.npm/package/npm-shrinkwrap.json

@@ -1,7 +1,7 @@
 {
   "dependencies": {
     "install": {
-      "version": "0.4.2"
+      "version": "0.4.4"
     }
   }
 }

packages/modules-runtime/package.js

@@ -7,7 +7,7 @@ Package.describe({
 });
 
 Npm.depends({
-  install: "0.4.2"
+  install: "0.4.4"
 });
 
 Package.onUse(function(api) {

tools/isobuild/linker.js

@@ -495,14 +495,30 @@ _.extend(File.prototype, {
   _getClosureHeader() {
     if (this._useMeteorInstall()) {
       var header = "";
+
       if (this.deps.length > 0) {
         header += "[";
         _.each(this.deps, dep => {
           header += JSON.stringify(dep) + ",";
         });
       }
-      return header + "function(require,exports,module){";
+
+      const headerParts = [
+        header,
+        "function(require,exports,module"
+      ];
+
+      if (this.source.match(/\b__dirname\b/)) {
+        headerParts.push(",__filename,__dirname");
+      } else if (this.source.match(/\b__filename\b/)) {
+        headerParts.push(",__filename");
+      }
+
+      headerParts.push("){");
+
+      return headerParts.join("");
     }
+
     return "(function(){";
   },
 

tools/tests/apps/modules/package.json

@@ -6,6 +6,7 @@
   "dependencies": {
     "events": "^1.1.0",
     "moment": "2.11.1",
+    "path": "^0.12.7",
     "regenerator": "^0.8.42",
     "stream-browserify": "^2.0.1",
     "util": "^0.10.3"

tools/tests/apps/modules/tests.js

@@ -90,6 +90,14 @@ describe("app modules", () => {
     let foo = 1234;
     delete foo;
   });
+
+  it("should have access to filename and dirname", () => {
+    assert.strictEqual(require(__filename), exports);
+    assert.strictEqual(
+      require("path").relative(__dirname, __filename),
+      "tests.js"
+    );
+  });
 });
 
 describe("template modules", () => {