Method computeJsOutputFilesMap

tools/isobuild/compiler-plugin.js:1253–1494

(sourceBatches)

  // Returns a map from package names to arrays of JS output files.
  static computeJsOutputFilesMap(sourceBatches) {
    const map = new Map;

    sourceBatches.forEach(batch => {
      const name = batch.unibuild.pkg.name || null;
      const inputFiles = [];

      batch.resourceSlots.forEach(slot => {
        inputFiles.push(...slot.jsOutputResources);
      });

      map.set(name, {
        files: inputFiles,
        mainModule: _.find(inputFiles, file => file.mainModule) || null,
        batch,
        importScannerWatchSet: new WatchSet(),
      });
    });

    if (! map.has("modules")) {
      // In the unlikely event that no package is using the modules
      // package, then the map is already complete, and we don't need to
      // do any import scanning.
      return this._watchOutputFiles(map);
    }

    // Append install(<name>) calls to the install-packages.js file in the
    // modules package for every Meteor package name used.
    map.get("modules").files.some(file => {
      if (file.sourcePath !== "install-packages.js") {
        return false;
      }

      const meteorPackageInstalls = [];

      map.forEach((info, name) => {
        if (! name) return;

        const mainModule = info.mainModule &&
          `meteor/${name}/${info.mainModule.targetPath}`;

        meteorPackageInstalls.push(
          "install(" + JSON.stringify(name) +
            (mainModule ? ", " + JSON.stringify(mainModule) : '') +
          ");\n"
        );
      });

      if (meteorPackageInstalls.length === 0) {
        return false;
      }

      file.data = Buffer.from(
        file.data.toString("utf8") + "\n" +
          meteorPackageInstalls.join(""),
        "utf8"
      );