diff --git a/tools/isobuild/package-npm.ts b/tools/isobuild/package-npm.ts
deleted file mode 100644
index 745a85badb..0000000000
--- a/tools/isobuild/package-npm.ts
+++ /dev/null
@@ -1,135 +0,0 @@
-import { ensureOnlyValidVersions } from "../utils/utils.js";
-import buildmessage from "../utils/buildmessage.js";
-import NpmDiscards from "./npm-discards";
-
-const nodeRequire = require;
-
-interface Dependencies {
-  [packageName: string]: string;
-}
-
-interface Discards {
-  [packageName: string]: (string | RegExp)[];
-}
-
-export class PackageNpm {
-  private _dependencies: Dependencies | null;
-
-  /**
-   * @summary Class of the 'Npm' object visible in package.js
-   * @locus package.js
-   * @instanceName Npm
-   * @showInstanceName true
-   */
-  constructor() {
-    // Files to be stripped from the installed NPM dependency tree. See
-    // the Npm.strip comment below for further usage information.
-    this._discards = new NpmDiscards;
-    this._dependencies = null;
-  }
-
-  /**
-   * @summary Specify which [NPM](https://www.npmjs.org/) packages
-   * your Meteor package depends on.
-   * @param  {Object} dependencies An object where the keys are package
-   * names and the values are one of:
-   *   1. Version numbers in string form
-   *   2. http(s) URLs of npm packages
-   *   3. Git URLs in the format described [here](https://docs.npmjs.com/files/package.json#git-urls-as-dependencies)
-   *
-   * Https URL example:
-   *
-   * ```js
-   * Npm.depends({
-   *   moment: "2.8.3",
-   *   async: "https://github.com/caolan/async/archive/71fa2638973dafd8761fa5457c472a312cc820fe.tar.gz"
-   * });
-   * ```
-   *
-   * Git URL example:
-   *
-   * ```js
-   * Npm.depends({
-   *   moment: "2.8.3",
-   *   async: "git+https://github.com/caolan/async#master"
-   * });
-   * ```
-   * @locus package.js
-   */
-  depends(dependencies: Dependencies) {
-    // XXX make dependencies be separate between use and test, so that
-    // production doesn't have to ship all of the npm modules used by test
-    // code
-    if (this._dependencies) {
-      buildmessage.error("Npm.depends may only be called once per package",
-                         { useMyCaller: true });
-      // recover by ignoring the Npm.depends line
-      return;
-    }
-
-    if (typeof dependencies !== 'object') {
-      buildmessage.error("the argument to Npm.depends should be an " +
-                         "object, like this: {gcd: '0.0.0'}",
-                         { useMyCaller: true });
-      // recover by ignoring the Npm.depends line
-      return;
-    }
-
-    // don't allow npm fuzzy versions so that there is complete
-    // consistency when deploying a meteor app
-    //
-    // XXX use something like seal or lockdown to have *complete*
-    // confidence we're running the same code?
-    try {
-      ensureOnlyValidVersions(dependencies, {
-        forCordova: false
-      });
-
-    } catch (e) {
-      buildmessage.error(e.message, {
-        useMyCaller: true,
-        downcase: true
-      });
-
-      // recover by ignoring the Npm.depends line
-      return;
-    }
-
-    this._dependencies = dependencies;
-  }
-
-  // The `Npm.strip` method makes up for packages that have missing
-  // or incomplete .npmignore files by telling the bundler to strip out
-  // certain unnecessary files and/or directories during `meteor build`.
-  //
-  // The `discards` parameter should be an object whose keys are
-  // top-level package names and whose values are arrays of strings
-  // (or regular expressions) that match paths in that package's
-  // directory that should be stripped before installation. For
-  // example:
-  //
-  //   Npm.strip({
-  //     connect: [/*\.wmv$/],
-  //     useragent: ["tests/"]
-  //   });
-  //
-  // This means (1) "remove any files with the `.wmv` extension from
-  // the 'connect' package directory" and (2) "remove the 'tests'
-  // directory from the 'useragent' package directory."
-  strip(discards: Discards) {
-    this._discards.merge(discards);
-  }
-
-  require(name: string) {
-    try {
-      return nodeRequire(name); // from the dev bundle
-    } catch (e) {
-      buildmessage.error(
-        "can't find npm module '" + name +
-          "'. In package.js, Npm.require can only find built-in modules.",
-        { useMyCaller: true });
-      // recover by, uh, returning undefined, which is likely to
-      // have some knock-on effects
-    }
-  }
-}