gulpfile.js

/* Copyright 2016 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/* eslint-env node */
/* eslint-disable object-shorthand */
/* globals target */

"use strict";

var autoprefixer = require("autoprefixer");
var fancylog = require("fancy-log");
var fs = require("fs");
var gulp = require("gulp");
var postcss = require("gulp-postcss");
var rename = require("gulp-rename");
var replace = require("gulp-replace");
var mkdirp = require("mkdirp");
var path = require("path");
var rimraf = require("rimraf");
var stream = require("stream");
var exec = require("child_process").exec;
var spawn = require("child_process").spawn;
var spawnSync = require("child_process").spawnSync;
var streamqueue = require("streamqueue");
var merge = require("merge-stream");
var zip = require("gulp-zip");
var webpack2 = require("webpack");
var webpackStream = require("webpack-stream");
var Vinyl = require("vinyl");
var vfs = require("vinyl-fs");
var through = require("through2");

var BUILD_DIR = "build/";
var L10N_DIR = "l10n/";
var TEST_DIR = "test/";
var EXTENSION_SRC_DIR = "extensions/";

var BASELINE_DIR = BUILD_DIR + "baseline/";
var MOZCENTRAL_BASELINE_DIR = BUILD_DIR + "mozcentral.baseline/";
var GENERIC_DIR = BUILD_DIR + "generic/";
var COMPONENTS_DIR = BUILD_DIR + "components/";
var IMAGE_DECODERS_DIR = BUILD_DIR + "image_decoders";
var DEFAULT_PREFERENCES_DIR = BUILD_DIR + "default_preferences/";
var MINIFIED_DIR = BUILD_DIR + "minified/";
var JSDOC_BUILD_DIR = BUILD_DIR + "jsdoc/";
var GH_PAGES_DIR = BUILD_DIR + "gh-pages/";
var SRC_DIR = "src/";
var LIB_DIR = BUILD_DIR + "lib/";
var DIST_DIR = BUILD_DIR + "dist/";
var COMMON_WEB_FILES = ["web/images/*.{png,svg,gif,cur}", "web/debugger.js"];
var MOZCENTRAL_DIFF_FILE = "mozcentral.diff";

var REPO = "git@github.com:mozilla/pdf.js.git";
var DIST_REPO_URL = "https://github.com/mozilla/pdfjs-dist";

var builder = require("./external/builder/builder.js");

var CONFIG_FILE = "pdfjs.config";
var config = JSON.parse(fs.readFileSync(CONFIG_FILE).toString());

// Default Autoprefixer config used for generic, components, minified-pre
var AUTOPREFIXER_CONFIG = {
  overrideBrowserslist: [
    "last 2 versions",
    "Chrome >= 49", // Last supported on Windows XP
    "Firefox >= 52", // Last supported on Windows XP
    "Firefox ESR",
    "IE >= 11",
    "Safari >= 9",
    "> 0.5%",
    "not dead",
  ],
};

var DEFINES = {
  PRODUCTION: true,
  TESTING: false,
  // The main build targets:
  GENERIC: false,
  FIREFOX: false,
  MOZCENTRAL: false,
  CHROME: false,
  MINIFIED: false,
  COMPONENTS: false,
  LIB: false,
  SKIP_BABEL: false,
  IMAGE_DECODERS: false,
};

function transform(charEncoding, transformFunction) {
  return through.obj(function(vinylFile, enc, done) {
    var transformedFile = vinylFile.clone();
    transformedFile.contents = Buffer.from(
      transformFunction(transformedFile.contents),
      charEncoding
    );
    done(null, transformedFile);
  });
}

function safeSpawnSync(command, parameters, options) {
  // Execute all commands in a shell.
  options = options || {};
  options.shell = true;
  // `options.shell = true` requires parameters to be quoted.
  parameters = parameters.map(param => {
    if (!/[\s`~!#$*(){\[|\\;'"<>?]/.test(param)) {
      return param;
    }
    return '"' + param.replace(/([$\\"`])/g, "\\$1") + '"';
  });

  var result = spawnSync(command, parameters, options);
  if (result.status !== 0) {
    console.log(
      'Error: command "' +
        command +
        '" with parameters "' +
        parameters +
        '" exited with code ' +
        result.status
    );
    process.exit(result.status);
  }
  return result;
}

function startNode(args, options) {
  // Node.js decreased the maximum header size from 80 KB to 8 KB in newer
  // releases, which is not sufficient for some of our reference test files
  // (such as `issue6360.pdf`), so we need to restore this value. Note that
  // this argument needs to be before all other arguments as it needs to be
  // passed to the Node.js process itself and not to the script that it runs.
  args.unshift("--max-http-header-size=80000");
  return spawn("node", args, options);
}

function createStringSource(filename, content) {
  var source = stream.Readable({ objectMode: true });
  source._read = function() {
    this.push(
      new Vinyl({
        path: filename,
        contents: Buffer.from(content),
      })
    );
    this.push(null);
  };
  return source;
}

function createWebpackConfig(defines, output) {
  var path = require("path");

  var versionInfo = getVersionJSON();
  var bundleDefines = builder.merge(defines, {
    BUNDLE_VERSION: versionInfo.version,
    BUNDLE_BUILD: versionInfo.commit,
    TESTING: defines.TESTING || process.env["TESTING"] === "true",
  });
  var licenseHeaderLibre = fs
    .readFileSync("./src/license_header_libre.js")
    .toString();
  var enableSourceMaps =
    !bundleDefines.FIREFOX &&
    !bundleDefines.MOZCENTRAL &&
    !bundleDefines.CHROME &&
    !bundleDefines.TESTING;
  var skipBabel =
    bundleDefines.SKIP_BABEL || process.env["SKIP_BABEL"] === "true";

  // Required to expose e.g., the `window` object.
  output.globalObject = "this";

  return {
    mode: "none",
    output: output,
    performance: {
      hints: false, // Disable messages about larger file sizes.
    },
    plugins: [
      new webpack2.BannerPlugin({ banner: licenseHeaderLibre, raw: true }),
    ],
    resolve: {
      alias: {
        pdfjs: path.join(__dirname, "src"),
        "pdfjs-web": path.join(__dirname, "web"),
        "pdfjs-lib": path.join(__dirname, "web/pdfjs"),
      },
    },
    devtool: enableSourceMaps ? "source-map" : undefined,
    module: {
      rules: [
        {
          loader: "babel-loader",
          // `core-js` (see https://github.com/zloirock/core-js/issues/514),
          // `web-streams-polyfill` (already using a transpiled file), and
          // `src/core/{glyphlist,unicode}.js` (Babel is too slow for those)
          // should be excluded from processing.
          exclude: /(node_modules[\\\/]core-js|node_modules[\\\/]web-streams-polyfill|src[\\\/]core[\\\/](glyphlist|unicode))/,
          options: {
            presets: skipBabel ? undefined : ["@babel/preset-env"],
            plugins: [
              "@babel/plugin-transform-modules-commonjs",
              [
                "@babel/plugin-transform-runtime",
                {
                  helpers: false,
                  regenerator: true,
                },
              ],
            ],
          },
        },
        {
          loader: path.join(__dirname, "external/webpack/pdfjsdev-loader.js"),
          options: {
            rootPath: __dirname,
            saveComments: false,
            defines: bundleDefines,
          },
        },
      ],
    },
    // Avoid shadowing actual Node.js variables with polyfills, by disabling
    // polyfills/mocks - https://webpack.js.org/configuration/node/
    node: false,
  };
}

function webpack2Stream(config) {
  // Replacing webpack1 to webpack2 in the webpack-stream.
  return webpackStream(config, webpack2);
}

function getVersionJSON() {
  return JSON.parse(fs.readFileSync(BUILD_DIR + "version.json").toString());
}

function checkChromePreferencesFile(chromePrefsPath, webPrefsPath) {
  var chromePrefs = JSON.parse(fs.readFileSync(chromePrefsPath).toString());
  var chromePrefsKeys = Object.keys(chromePrefs.properties);
  chromePrefsKeys = chromePrefsKeys.filter(function(key) {
    var description = chromePrefs.properties[key].description;
    // Deprecated keys are allowed in the managed preferences file.
    // The code maintained is responsible for adding migration logic to
    // extensions/chromium/options/migration.js and web/chromecom.js .
    return !description || !description.startsWith("DEPRECATED.");
  });
  chromePrefsKeys.sort();
  var webPrefs = JSON.parse(fs.readFileSync(webPrefsPath).toString());
  var webPrefsKeys = Object.keys(webPrefs);
  webPrefsKeys.sort();
  var telemetryIndex = chromePrefsKeys.indexOf("disableTelemetry");
  if (telemetryIndex >= 0) {
    chromePrefsKeys.splice(telemetryIndex, 1);
  } else {
    console.log("Warning: disableTelemetry key not found in chrome prefs!");
    return false;
  }
  if (webPrefsKeys.length !== chromePrefsKeys.length) {
    return false;
  }
  return webPrefsKeys.every(function(value, index) {
    return (
      chromePrefsKeys[index] === value &&
      chromePrefs.properties[value].default === webPrefs[value]
    );
  });
}

function replaceWebpackRequire() {
  // Produced bundles can be rebundled again, avoid collisions (e.g. in api.js)
  // by renaming  __webpack_require__ to something else.
  return replace("__webpack_require__", "__w_pdfjs_require__");
}

function replaceJSRootName(amdName, jsName) {
  // Saving old-style JS module name.
  return replace(
    'root["' + amdName + '"] = factory()',
    'root["' + amdName + '"] = root.' + jsName + " = factory()"
  );
}

function createBundle(defines) {
  console.log();
  console.log("### Bundling files into pdf.js");

  var mainAMDName = "pdfjs-dist/build/pdf";
  var mainOutputName = "pdf.js";

  var mainFileConfig = createWebpackConfig(defines, {
    filename: mainOutputName,
    library: mainAMDName,
    libraryTarget: "umd",
    umdNamedDefine: true,
  });
  var mainOutput = gulp
    .src("./src/pdf.js")
    .pipe(webpack2Stream(mainFileConfig))
    .pipe(replaceWebpackRequire())
    .pipe(replaceJSRootName(mainAMDName, "pdfjsLib"));

  var workerAMDName = "pdfjs-dist/build/pdf.worker";
  var workerOutputName = "pdf.worker.js";

  var workerFileConfig = createWebpackConfig(defines, {
    filename: workerOutputName,
    library: workerAMDName,
    libraryTarget: "umd",
    umdNamedDefine: true,
  });

  var workerOutput = gulp
    .src("./src/pdf.worker.js")
    .pipe(webpack2Stream(workerFileConfig))
    .pipe(replaceWebpackRequire())
    .pipe(replaceJSRootName(workerAMDName, "pdfjsWorker"));
  return merge([mainOutput, workerOutput]);
}

function createWebBundle(defines) {
  var viewerOutputName = "viewer.js";

  var viewerFileConfig = createWebpackConfig(defines, {
    filename: viewerOutputName,
  });
  return gulp.src("./web/viewer.js").pipe(webpack2Stream(viewerFileConfig));
}

function createComponentsBundle(defines) {
  var componentsAMDName = "pdfjs-dist/web/pdf_viewer";
  var componentsOutputName = "pdf_viewer.js";

  var componentsFileConfig = createWebpackConfig(defines, {
    filename: componentsOutputName,
    library: componentsAMDName,
    libraryTarget: "umd",
    umdNamedDefine: true,
  });
  return gulp
    .src("./web/pdf_viewer.component.js")
    .pipe(webpack2Stream(componentsFileConfig))
    .pipe(replaceWebpackRequire())
    .pipe(replaceJSRootName(componentsAMDName, "pdfjsViewer"));
}

function createImageDecodersBundle(defines) {
  var imageDecodersAMDName = "pdfjs-dist/image_decoders/pdf.image_decoders";
  var imageDecodersOutputName = "pdf.image_decoders.js";

  var componentsFileConfig = createWebpackConfig(defines, {
    filename: imageDecodersOutputName,
    library: imageDecodersAMDName,
    libraryTarget: "umd",
    umdNamedDefine: true,
  });
  return gulp
    .src("./src/pdf.image_decoders.js")
    .pipe(webpack2Stream(componentsFileConfig))
    .pipe(replaceWebpackRequire())
    .pipe(replaceJSRootName(imageDecodersAMDName, "pdfjsImageDecoders"));
}

function checkFile(path) {
  try {
    var stat = fs.lstatSync(path);
    return stat.isFile();
  } catch (e) {
    return false;
  }
}

function checkDir(path) {
  try {
    var stat = fs.lstatSync(path);
    return stat.isDirectory();
  } catch (e) {
    return false;
  }
}

function replaceInFile(path, find, replacement) {
  var content = fs.readFileSync(path).toString();
  content = content.replace(find, replacement);
  fs.writeFileSync(path, content);
}

function getTempFile(prefix, suffix) {
  mkdirp.sync(BUILD_DIR + "tmp/");
  var bytes = require("crypto")
    .randomBytes(6)
    .toString("hex");
  var path = BUILD_DIR + "tmp/" + prefix + bytes + suffix;
  fs.writeFileSync(path, "");
  return path;
}

function createTestSource(testsName, bot) {
  var source = stream.Readable({ objectMode: true });
  source._read = function() {
    console.log();
    console.log("### Running " + testsName + " tests");

    var PDF_TEST = process.env["PDF_TEST"] || "test_manifest.json";
    var PDF_BROWSERS =
      process.env["PDF_BROWSERS"] ||
      "resources/browser_manifests/browser_manifest.json";

    if (!checkFile("test/" + PDF_BROWSERS)) {
      console.log(
        "Browser manifest file test/" + PDF_BROWSERS + " does not exist."
      );
      console.log(
        "Copy and adjust the example in test/resources/browser_manifests."
      );
      this.emit("error", new Error("Missing manifest file"));
      return null;
    }

    var args = ["test.js"];
    switch (testsName) {
      case "browser":
        args.push("--reftest", "--manifestFile=" + PDF_TEST);
        break;
      case "browser (no reftest)":
        args.push("--manifestFile=" + PDF_TEST);
        break;
      case "unit":
        args.push("--unitTest");
        break;
      case "font":
        args.push("--fontTest");
        break;
      default:
        this.emit("error", new Error("Unknown name: " + testsName));
        return null;
    }
    args.push("--browserManifestFile=" + PDF_BROWSERS);
    if (bot) {
      args.push("--strictVerify");
    }

    var testProcess = startNode(args, { cwd: TEST_DIR, stdio: "inherit" });
    testProcess.on("close", function(code) {
      source.push(null);
    });
    return undefined;
  };
  return source;
}

function makeRef(done, bot) {
  console.log();
  console.log("### Creating reference images");

  var PDF_BROWSERS =
    process.env["PDF_BROWSERS"] ||
    "resources/browser_manifests/browser_manifest.json";

  if (!checkFile("test/" + PDF_BROWSERS)) {
    console.log(
      "Browser manifest file test/" + PDF_BROWSERS + " does not exist."
    );
    console.log(
      "Copy and adjust the example in test/resources/browser_manifests."
    );
    done(new Error("Missing manifest file"));
    return;
  }

  var args = ["test.js", "--masterMode"];
  if (bot) {
    args.push("--noPrompts", "--strictVerify");
  }
  args.push("--browserManifestFile=" + PDF_BROWSERS);
  var testProcess = startNode(args, { cwd: TEST_DIR, stdio: "inherit" });
  testProcess.on("close", function(code) {
    done();
  });
}

gulp.task("default", function(done) {
  console.log("Available tasks:");
  var tasks = Object.keys(gulp.registry().tasks());
  tasks.sort();
  tasks.forEach(function(taskName) {
    console.log("  " + taskName);
  });
  done();
});

gulp.task("buildnumber", function(done) {
  console.log();
  console.log("### Getting extension build number");

  exec("git log --format=oneline " + config.baseVersion + "..", function(
    err,
    stdout,
    stderr
  ) {
    var buildNumber = 0;
    if (!err) {
      // Build number is the number of commits since base version
      buildNumber = stdout ? stdout.match(/\n/g).length : 0;
    } else {
      console.log("This is not a Git repository; using default build number.");
    }

    console.log("Extension build number: " + buildNumber);

    var version = config.versionPrefix + buildNumber;

    exec('git log --format="%h" -n 1', function(err, stdout, stderr) {
      var buildCommit = "";
      if (!err) {
        buildCommit = stdout.replace("\n", "");
      }

      createStringSource(
        "version.json",
        JSON.stringify(
          {
            version: version,
            build: buildNumber,
            commit: buildCommit,
          },
          null,
          2
        )
      )
        .pipe(gulp.dest(BUILD_DIR))
        .on("end", done);
    });
  });
});

gulp.task("default_preferences-pre", function() {
  console.log();
  console.log("### Building `default_preferences.json`");

  // Refer to the comment in the 'lib' task below.
  function babelPluginReplaceNonWebPackRequire(babel) {
    return {
      visitor: {
        Identifier(path, state) {
          if (path.node.name === "__non_webpack_require__") {
            path.replaceWith(babel.types.identifier("require"));
          }
        },
      },
    };
  }
  function preprocess(content) {
    content = preprocessor2.preprocessPDFJSCode(ctx, content);
    return babel.transform(content, {
      sourceType: "module",
      presets: undefined, // SKIP_BABEL
      plugins: [
        "@babel/plugin-transform-modules-commonjs",
        babelPluginReplaceNonWebPackRequire,
      ],
    }).code;
  }
  var babel = require("@babel/core");
  var ctx = {
    rootPath: __dirname,
    saveComments: false,
    defines: builder.merge(DEFINES, {
      GENERIC: true,
      LIB: true,
      BUNDLE_VERSION: 0, // Dummy version
      BUNDLE_BUILD: 0, // Dummy build
    }),
    map: {
      "pdfjs-lib": "../pdf",
    },
  };
  var preprocessor2 = require("./external/builder/preprocessor2.js");
  return merge([
    gulp.src(
      [
        "src/{display,shared}/*.js",
        "!src/shared/{cffStandardStrings,fonts_utils}.js",
        "src/pdf.js",
      ],
      { base: "src/" }
    ),
    gulp.src(["web/*.js", "!web/{app,pdfjs,preferences,viewer}.js"], {
      base: ".",
    }),
  ])
    .pipe(transform("utf8", preprocess))
    .pipe(gulp.dest(DEFAULT_PREFERENCES_DIR + "lib/"));
});

gulp.task(
  "default_preferences",
  gulp.series("default_preferences-pre", function(done) {
    var AppOptionsLib = require("./" +
      DEFAULT_PREFERENCES_DIR +
      "lib/web/app_options.js");
    var AppOptions = AppOptionsLib.AppOptions;
    var OptionKind = AppOptionsLib.OptionKind;

    createStringSource(
      "default_preferences.json",
      JSON.stringify(AppOptions.getAll(OptionKind.PREFERENCE), null, 2)
    )
      .pipe(gulp.dest(BUILD_DIR))
      .on("end", done);
  })
);

gulp.task("locale", function() {
  var VIEWER_LOCALE_OUTPUT = "web/locale/";

  console.log();
  console.log("### Building localization files");

  rimraf.sync(VIEWER_LOCALE_OUTPUT);
  mkdirp.sync(VIEWER_LOCALE_OUTPUT);

  var subfolders = fs.readdirSync(L10N_DIR);
  subfolders.sort();
  var viewerOutput = "";
  var locales = [];
  for (var i = 0; i < subfolders.length; i++) {
    var locale = subfolders[i];
    var path = L10N_DIR + locale;
    if (!checkDir(path)) {
      continue;
    }
    if (!/^[a-z][a-z]([a-z])?(-[A-Z][A-Z])?$/.test(locale)) {
      console.log("Skipping invalid locale: " + locale);
      continue;
    }

    mkdirp.sync(VIEWER_LOCALE_OUTPUT + "/" + locale);

    locales.push(locale);

    if (checkFile(path + "/viewer.properties")) {
      viewerOutput +=
        "[" +
        locale +
        "]\n" +
        "@import url(" +
        locale +
        "/viewer.properties)\n\n";
    }
  }

  return merge([
    createStringSource("locale.properties", viewerOutput).pipe(
      gulp.dest(VIEWER_LOCALE_OUTPUT)
    ),
    gulp
      .src(L10N_DIR + "/{" + locales.join(",") + "}/viewer.properties", {
        base: L10N_DIR,
      })
      .pipe(gulp.dest(VIEWER_LOCALE_OUTPUT)),
  ]);
});

gulp.task("cmaps", function(done) {
  var CMAP_INPUT = "external/cmaps";
  var VIEWER_CMAP_OUTPUT = "external/bcmaps";

  console.log();
  console.log("### Building cmaps");

  // Testing a file that usually present.
  if (!checkFile(CMAP_INPUT + "/UniJIS-UCS2-H")) {
    console.log("./external/cmaps has no cmap files, download them from:");
    console.log("  https://github.com/adobe-type-tools/cmap-resources");
    throw new Error("cmap files were not found");
  }

  // Remove old bcmap files.
  fs.readdirSync(VIEWER_CMAP_OUTPUT).forEach(function(file) {
    if (/\.bcmap$/i.test(file)) {
      fs.unlinkSync(VIEWER_CMAP_OUTPUT + "/" + file);
    }
  });

  var compressCmaps = require("./external/cmapscompress/compress.js")
    .compressCmaps;
  compressCmaps(CMAP_INPUT, VIEWER_CMAP_OUTPUT, true);
  done();
});

gulp.task(
  "bundle",
  gulp.series("buildnumber", function() {
    return createBundle(DEFINES).pipe(gulp.dest(BUILD_DIR));
  })
);

function preprocessCSS(source, mode, defines, cleanup) {
  var outName = getTempFile("~preprocess", ".css");
  builder.preprocessCSS(mode, source, outName);
  var out = fs.readFileSync(outName).toString();
  fs.unlinkSync(outName);
  if (cleanup) {
    // Strip out all license headers in the middle.
    var reg = /\n\/\* Copyright(.|\n)*?Mozilla Foundation(.|\n)*?\*\//g;
    out = out.replace(reg, "");
  }

  var i = source.lastIndexOf("/");
  return createStringSource(source.substr(i + 1), out);
}

function preprocessHTML(source, defines) {
  var outName = getTempFile("~preprocess", ".html");
  builder.preprocess(source, outName, defines);
  var out = fs.readFileSync(outName).toString();
  fs.unlinkSync(outName);

  var i = source.lastIndexOf("/");
  return createStringSource(source.substr(i + 1), out);
}

// Builds the generic production viewer that should be compatible with most
// modern HTML5 browsers.
gulp.task(
  "generic",
  gulp.series("buildnumber", "default_preferences", "locale", function() {
    console.log();
    console.log("### Creating generic viewer");
    var defines = builder.merge(DEFINES, { GENERIC: true });

    rimraf.sync(GENERIC_DIR);

    return merge([
      createBundle(defines).pipe(gulp.dest(GENERIC_DIR + "build")),
      createWebBundle(defines).pipe(gulp.dest(GENERIC_DIR + "web")),
      gulp
        .src(COMMON_WEB_FILES, { base: "web/" })
        .pipe(gulp.dest(GENERIC_DIR + "web")),
      gulp.src("LICENSE").pipe(gulp.dest(GENERIC_DIR)),
      gulp
        .src(
          ["web/locale/*/viewer.properties", "web/locale/locale.properties"],
          { base: "web/" }
        )
        .pipe(gulp.dest(GENERIC_DIR + "web")),
      gulp
        .src(["external/bcmaps/*.bcmap", "external/bcmaps/LICENSE"], {
          base: "external/bcmaps",
        })
        .pipe(gulp.dest(GENERIC_DIR + "web/cmaps")),
      preprocessHTML("web/viewer.html", defines).pipe(
        gulp.dest(GENERIC_DIR + "web")
      ),
      preprocessCSS("web/viewer.css", "generic", defines, true)
        .pipe(postcss([autoprefixer(AUTOPREFIXER_CONFIG)]))
        .pipe(gulp.dest(GENERIC_DIR + "web")),

      gulp
        .src("web/compressed.tracemonkey-pldi-09.pdf")
        .pipe(gulp.dest(GENERIC_DIR + "web")),
    ]);
  })
);

gulp.task(
  "components",
  gulp.series("buildnumber", function() {
    console.log();
    console.log("### Creating generic components");
    var defines = builder.merge(DEFINES, { COMPONENTS: true, GENERIC: true });

    rimraf.sync(COMPONENTS_DIR);

    var COMPONENTS_IMAGES = [
      "web/images/annotation-*.svg",
      "web/images/loading-icon.gif",
      "web/images/shadow.png",
      "web/images/texture.png",
    ];

    return merge([
      createComponentsBundle(defines).pipe(gulp.dest(COMPONENTS_DIR)),
      gulp.src(COMPONENTS_IMAGES).pipe(gulp.dest(COMPONENTS_DIR + "images")),
      preprocessCSS("web/pdf_viewer.css", "components", defines, true)
        .pipe(postcss([autoprefixer(AUTOPREFIXER_CONFIG)]))
        .pipe(gulp.dest(COMPONENTS_DIR)),
    ]);
  })
);

gulp.task(
  "image_decoders",
  gulp.series("buildnumber", function() {
    console.log();
    console.log("### Creating image decoders");
    var defines = builder.merge(DEFINES, {
      GENERIC: true,
      IMAGE_DECODERS: true,
    });

    return createImageDecodersBundle(defines).pipe(
      gulp.dest(IMAGE_DECODERS_DIR)
    );
  })
);

gulp.task(
  "minified-pre",
  gulp.series("buildnumber", "default_preferences", "locale", function() {
    console.log();
    console.log("### Creating minified viewer");
    var defines = builder.merge(DEFINES, { MINIFIED: true, GENERIC: true });

    rimraf.sync(MINIFIED_DIR);

    return merge([
      createBundle(defines).pipe(gulp.dest(MINIFIED_DIR + "build")),
      createWebBundle(defines).pipe(gulp.dest(MINIFIED_DIR + "web")),
      createImageDecodersBundle(
        builder.merge(defines, { IMAGE_DECODERS: true })
      ).pipe(gulp.dest(MINIFIED_DIR + "image_decoders")),
      gulp
        .src(COMMON_WEB_FILES, { base: "web/" })
        .pipe(gulp.dest(MINIFIED_DIR + "web")),
      gulp
        .src(
          ["web/locale/*/viewer.properties", "web/locale/locale.properties"],
          { base: "web/" }
        )
        .pipe(gulp.dest(MINIFIED_DIR + "web")),
      gulp
        .src(["external/bcmaps/*.bcmap", "external/bcmaps/LICENSE"], {
          base: "external/bcmaps",
        })
        .pipe(gulp.dest(MINIFIED_DIR + "web/cmaps")),

      preprocessHTML("web/viewer.html", defines).pipe(
        gulp.dest(MINIFIED_DIR + "web")
      ),
      preprocessCSS("web/viewer.css", "minified", defines, true)
        .pipe(postcss([autoprefixer(AUTOPREFIXER_CONFIG)]))
        .pipe(gulp.dest(MINIFIED_DIR + "web")),

      gulp
        .src("web/compressed.tracemonkey-pldi-09.pdf")
        .pipe(gulp.dest(MINIFIED_DIR + "web")),
    ]);
  })
);

gulp.task(
  "minified-post",
  gulp.series("minified-pre", function(done) {
    var pdfFile = fs.readFileSync(MINIFIED_DIR + "/build/pdf.js").toString();
    var pdfWorkerFile = fs
      .readFileSync(MINIFIED_DIR + "/build/pdf.worker.js")
      .toString();
    var pdfImageDecodersFile = fs
      .readFileSync(MINIFIED_DIR + "/image_decoders/pdf.image_decoders.js")
      .toString();
    var viewerFiles = {
      "pdf.js": pdfFile,
      "viewer.js": fs.readFileSync(MINIFIED_DIR + "/web/viewer.js").toString(),
    };

    console.log();
    console.log("### Minifying js files");

    var Terser = require("terser");
    // V8 chokes on very long sequences. Works around that.
    var optsForHugeFile = { compress: { sequences: false } };

    fs.writeFileSync(
      MINIFIED_DIR + "/web/pdf.viewer.js",
      Terser.minify(viewerFiles).code
    );
    fs.writeFileSync(
      MINIFIED_DIR + "/build/pdf.min.js",
      Terser.minify(pdfFile).code
    );
    fs.writeFileSync(
      MINIFIED_DIR + "/build/pdf.worker.min.js",
      Terser.minify(pdfWorkerFile, optsForHugeFile).code
    );
    fs.writeFileSync(
      MINIFIED_DIR + "image_decoders/pdf.image_decoders.min.js",
      Terser.minify(pdfImageDecodersFile).code
    );

    console.log();
    console.log("### Cleaning js files");

    fs.unlinkSync(MINIFIED_DIR + "/web/viewer.js");
    fs.unlinkSync(MINIFIED_DIR + "/web/debugger.js");
    fs.unlinkSync(MINIFIED_DIR + "/build/pdf.js");
    fs.unlinkSync(MINIFIED_DIR + "/build/pdf.worker.js");
    fs.renameSync(
      MINIFIED_DIR + "/build/pdf.min.js",
      MINIFIED_DIR + "/build/pdf.js"
    );
    fs.renameSync(
      MINIFIED_DIR + "/build/pdf.worker.min.js",
      MINIFIED_DIR + "/build/pdf.worker.js"
    );
    fs.renameSync(
      MINIFIED_DIR + "/image_decoders/pdf.image_decoders.min.js",
      MINIFIED_DIR + "/image_decoders/pdf.image_decoders.js"
    );
    done();
  })
);

gulp.task("minified", gulp.series("minified-post"));

function preprocessDefaultPreferences(content) {
  var preprocessor2 = require("./external/builder/preprocessor2.js");
  var licenseHeader = fs.readFileSync("./src/license_header.js").toString();

  var GLOBALS = "/* eslint-disable */\n";
  var MODIFICATION_WARNING =
    "//\n// THIS FILE IS GENERATED AUTOMATICALLY, DO NOT EDIT MANUALLY!\n//\n";

  content = preprocessor2.preprocessPDFJSCode(
    {
      rootPath: __dirname,
      defines: DEFINES,
    },
    content
  );

  return (
    licenseHeader +
    "\n" +
    GLOBALS +
    "\n" +
    MODIFICATION_WARNING +
    "\n" +
    content +
    "\n"
  );
}

gulp.task(
  "mozcentral-pre",
  gulp.series("buildnumber", "default_preferences", function() {
    console.log();
    console.log("### Building mozilla-central extension");
    var defines = builder.merge(DEFINES, {
      MOZCENTRAL: true,
      SKIP_BABEL: true,
    });

    var MOZCENTRAL_DIR = BUILD_DIR + "mozcentral/",
      MOZCENTRAL_EXTENSION_DIR = MOZCENTRAL_DIR + "browser/extensions/pdfjs/",
      MOZCENTRAL_CONTENT_DIR = MOZCENTRAL_EXTENSION_DIR + "content/",
      FIREFOX_EXTENSION_DIR = "extensions/firefox/",
      MOZCENTRAL_L10N_DIR = MOZCENTRAL_DIR + "browser/locales/en-US/pdfviewer/",
      FIREFOX_CONTENT_DIR = EXTENSION_SRC_DIR + "/firefox/content/";

    // Clear out everything in the firefox extension build directory
    rimraf.sync(MOZCENTRAL_DIR);

    var versionJSON = getVersionJSON();
    var version = versionJSON.version,
      commit = versionJSON.commit;

    return merge([
      createBundle(defines).pipe(gulp.dest(MOZCENTRAL_CONTENT_DIR + "build")),
      createWebBundle(defines).pipe(gulp.dest(MOZCENTRAL_CONTENT_DIR + "web")),
      gulp
        .src(COMMON_WEB_FILES, { base: "web/" })
        .pipe(gulp.dest(MOZCENTRAL_CONTENT_DIR + "web")),
      gulp
        .src(["external/bcmaps/*.bcmap", "external/bcmaps/LICENSE"], {
          base: "external/bcmaps",
        })
        .pipe(gulp.dest(MOZCENTRAL_CONTENT_DIR + "web/cmaps")),

      preprocessHTML("web/viewer.html", defines).pipe(
        gulp.dest(MOZCENTRAL_CONTENT_DIR + "web")
      ),
      preprocessCSS("web/viewer.css", "mozcentral", defines, true)
        .pipe(
          postcss([
            autoprefixer({ overrideBrowserslist: ["last 1 firefox versions"] }),
          ])
        )
        .pipe(gulp.dest(MOZCENTRAL_CONTENT_DIR + "web")),

      gulp.src("l10n/en-US/*.properties").pipe(gulp.dest(MOZCENTRAL_L10N_DIR)),
      gulp
        .src(FIREFOX_EXTENSION_DIR + "README.mozilla")
        .pipe(replace(/\bPDFJSSCRIPT_VERSION\b/g, version))
        .pipe(replace(/\bPDFJSSCRIPT_COMMIT\b/g, commit))
        .pipe(gulp.dest(MOZCENTRAL_EXTENSION_DIR)),
      gulp.src("LICENSE").pipe(gulp.dest(MOZCENTRAL_EXTENSION_DIR)),
      gulp
        .src(FIREFOX_CONTENT_DIR + "PdfJsDefaultPreferences.jsm")
        .pipe(transform("utf8", preprocessDefaultPreferences))
        .pipe(gulp.dest(MOZCENTRAL_CONTENT_DIR)),
    ]);
  })
);

gulp.task("mozcentral", gulp.series("mozcentral-pre"));

gulp.task(
  "chromium-pre",
  gulp.series("buildnumber", "default_preferences", "locale", function() {
    console.log();
    console.log("### Building Chromium extension");
    var defines = builder.merge(DEFINES, { CHROME: true });

    var CHROME_BUILD_DIR = BUILD_DIR + "/chromium/",
      CHROME_BUILD_CONTENT_DIR = CHROME_BUILD_DIR + "/content/";

    // Clear out everything in the chrome extension build directory
    rimraf.sync(CHROME_BUILD_DIR);

    var version = getVersionJSON().version;

    return merge([
      createBundle(defines).pipe(gulp.dest(CHROME_BUILD_CONTENT_DIR + "build")),
      createWebBundle(defines).pipe(
        gulp.dest(CHROME_BUILD_CONTENT_DIR + "web")
      ),
      gulp
        .src(COMMON_WEB_FILES, { base: "web/" })
        .pipe(gulp.dest(CHROME_BUILD_CONTENT_DIR + "web")),

      gulp
        .src(
          ["web/locale/*/viewer.properties", "web/locale/locale.properties"],
          { base: "web/" }
        )
        .pipe(gulp.dest(CHROME_BUILD_CONTENT_DIR + "web")),
      gulp
        .src(["external/bcmaps/*.bcmap", "external/bcmaps/LICENSE"], {
          base: "external/bcmaps",
        })
        .pipe(gulp.dest(CHROME_BUILD_CONTENT_DIR + "web/cmaps")),

      preprocessHTML("web/viewer.html", defines).pipe(
        gulp.dest(CHROME_BUILD_CONTENT_DIR + "web")
      ),
      preprocessCSS("web/viewer.css", "chrome", defines, true)
        .pipe(
          postcss([autoprefixer({ overrideBrowserslist: ["chrome >= 49"] })])
        )
        .pipe(gulp.dest(CHROME_BUILD_CONTENT_DIR + "web")),

      gulp.src("LICENSE").pipe(gulp.dest(CHROME_BUILD_DIR)),
      gulp
        .src("extensions/chromium/manifest.json")
        .pipe(replace(/\bPDFJSSCRIPT_VERSION\b/g, version))
        .pipe(gulp.dest(CHROME_BUILD_DIR)),
      gulp
        .src(
          [
            "extensions/chromium/**/*.{html,js,css,png}",
            "extensions/chromium/preferences_schema.json",
          ],
          { base: "extensions/chromium/" }
        )
        .pipe(gulp.dest(CHROME_BUILD_DIR)),
    ]);
  })
);

gulp.task("chromium", gulp.series("chromium-pre"));

gulp.task("jsdoc", function(done) {
  console.log();
  console.log("### Generating documentation (JSDoc)");

  var JSDOC_FILES = ["src/doc_helper.js", "src/display/api.js"];

  rimraf(JSDOC_BUILD_DIR, function() {
    mkdirp(JSDOC_BUILD_DIR, function() {
      var command =
        '"node_modules/.bin/jsdoc" -d ' +
        JSDOC_BUILD_DIR +
        " " +
        JSDOC_FILES.join(" ");
      exec(command, done);
    });
  });
});

gulp.task(
  "lib",
  gulp.series("buildnumber", "default_preferences", function() {
    // When we create a bundle, webpack is run on the source and it will replace
    // require with __webpack_require__. When we want to use the real require,
    // __non_webpack_require__ has to be used.
    // In this target, we don't create a bundle, so we have to replace the
    // occurences of __non_webpack_require__ ourselves.
    function babelPluginReplaceNonWebPackRequire(babel) {
      return {
        visitor: {
          Identifier(path, state) {
            if (path.node.name === "__non_webpack_require__") {
              path.replaceWith(babel.types.identifier("require"));
            }
          },
        },
      };
    }
    function preprocess(content) {
      var skipBabel =
        process.env["SKIP_BABEL"] === "true" ||
        /\/\*\s*no-babel-preset\s*\*\//.test(content);
      content = preprocessor2.preprocessPDFJSCode(ctx, content);
      content = babel.transform(content, {
        sourceType: "module",
        presets: skipBabel ? undefined : ["@babel/preset-env"],
        plugins: [
          "@babel/plugin-transform-modules-commonjs",
          [
            "@babel/plugin-transform-runtime",
            {
              helpers: false,
              regenerator: true,
            },
          ],
          babelPluginReplaceNonWebPackRequire,
        ],
      }).code;
      var removeCjsSrc = /^(var\s+\w+\s*=\s*(_interopRequireDefault\()?require\(".*?)(?:\/src)(\/[^"]*"\)\)?;)$/gm;
      content = content.replace(
        removeCjsSrc,
        (all, prefix, interop, suffix) => {
          return prefix + suffix;
        }
      );
      return licenseHeaderLibre + content;
    }
    var babel = require("@babel/core");
    var versionInfo = getVersionJSON();
    var ctx = {
      rootPath: __dirname,
      saveComments: false,
      defines: builder.merge(DEFINES, {
        GENERIC: true,
        LIB: true,
        BUNDLE_VERSION: versionInfo.version,
        BUNDLE_BUILD: versionInfo.commit,
        TESTING: process.env["TESTING"] === "true",
      }),
      map: {
        "pdfjs-lib": "../pdf",
      },
    };
    var licenseHeaderLibre = fs
      .readFileSync("./src/license_header_libre.js")
      .toString();
    var preprocessor2 = require("./external/builder/preprocessor2.js");
    return merge([
      gulp.src(
        [
          "src/{core,display,shared}/*.js",
          "!src/shared/{cffStandardStrings,fonts_utils}.js",
          "src/{pdf,pdf.worker}.js",
        ],
        { base: "src/" }
      ),
      gulp.src(
        ["examples/node/domstubs.js", "web/*.js", "!web/{pdfjs,viewer}.js"],
        { base: "." }
      ),
      gulp.src("test/unit/*.js", { base: "." }),
    ])
      .pipe(transform("utf8", preprocess))
      .pipe(gulp.dest("build/lib/"));
  })
);

gulp.task(
  "publish",
  gulp.series("generic", function(done) {
    var version = JSON.parse(
      fs.readFileSync(BUILD_DIR + "version.json").toString()
    ).version;

    config.stableVersion = config.betaVersion;
    config.betaVersion = version;

    createStringSource(CONFIG_FILE, JSON.stringify(config, null, 2))
      .pipe(gulp.dest("."))
      .on("end", function() {
        var targetName = "pdfjs-" + version + "-dist.zip";
        gulp
          .src(BUILD_DIR + "generic/**")
          .pipe(zip(targetName))
          .pipe(gulp.dest(BUILD_DIR))
          .on("end", function() {
            console.log("Built distribution file: " + targetName);
            done();
          });
      });
  })
);

gulp.task("testing-pre", function(done) {
  process.env["TESTING"] = "true";
  done();
});

gulp.task(
  "test",
  gulp.series("testing-pre", "generic", "components", function() {
    return streamqueue(
      { objectMode: true },
      createTestSource("unit"),
      createTestSource("browser")
    );
  })
);

gulp.task(
  "bottest",
  gulp.series("testing-pre", "generic", "components", function() {
    return streamqueue(
      { objectMode: true },
      createTestSource("unit", true),
      createTestSource("font", true),
      createTestSource("browser (no reftest)", true)
    );
  })
);

gulp.task(
  "browsertest",
  gulp.series("testing-pre", "generic", "components", function() {
    return createTestSource("browser");
  })
);

gulp.task(
  "unittest",
  gulp.series("testing-pre", "generic", "components", function() {
    return createTestSource("unit");
  })
);

gulp.task(
  "fonttest",
  gulp.series("testing-pre", function() {
    return createTestSource("font");
  })
);

gulp.task(
  "makeref",
  gulp.series("testing-pre", "generic", "components", function(done) {
    makeRef(done);
  })
);

gulp.task(
  "botmakeref",
  gulp.series("testing-pre", "generic", "components", function(done) {
    makeRef(done, true);
  })
);

gulp.task("baseline", function(done) {
  console.log();
  console.log("### Creating baseline environment");

  var baselineCommit = process.env["BASELINE"];
  if (!baselineCommit) {
    done(new Error("Missing baseline commit. Specify the BASELINE variable."));
    return;
  }

  var initializeCommand = "git fetch origin";
  if (!checkDir(BASELINE_DIR)) {
    mkdirp.sync(BASELINE_DIR);
    initializeCommand = "git clone ../../ .";
  }

  var workingDirectory = path.resolve(process.cwd(), BASELINE_DIR);
  exec(initializeCommand, { cwd: workingDirectory }, function(error) {
    if (error) {
      done(new Error("Baseline clone/fetch failed."));
      return;
    }

    exec("git checkout " + baselineCommit, { cwd: workingDirectory }, function(
      error
    ) {
      if (error) {
        done(new Error("Baseline commit checkout failed."));
        return;
      }

      console.log('Baseline commit "' + baselineCommit + '" checked out.');
      done();
    });
  });
});

gulp.task(
  "unittestcli",
  gulp.series("testing-pre", "lib", function(done) {
    var options = [
      "node_modules/jasmine/bin/jasmine",
      "JASMINE_CONFIG_PATH=test/unit/clitests.json",
    ];
    var jasmineProcess = startNode(options, { stdio: "inherit" });
    jasmineProcess.on("close", function(code) {
      if (code !== 0) {
        done(new Error("Unit tests failed."));
        return;
      }
      done();
    });
  })
);

gulp.task(
  "lint",
  gulp.series("default_preferences", function(done) {
    console.log();
    console.log("### Linting JS files");

    // Ensure that we lint the Firefox specific *.jsm files too.
    var options = [
      "node_modules/eslint/bin/eslint",
      "--ext",
      ".js,.jsm",
      ".",
      "--report-unused-disable-directives",
    ];
    var esLintProcess = startNode(options, { stdio: "inherit" });
    esLintProcess.on("close", function(code) {
      if (code !== 0) {
        done(new Error("ESLint failed."));
        return;
      }

      console.log();
      console.log("### Checking supplemental files");

      if (
        !checkChromePreferencesFile(
          "extensions/chromium/preferences_schema.json",
          "build/default_preferences.json"
        )
      ) {
        done(new Error("chromium/preferences_schema is not in sync."));
        return;
      }

      console.log("files checked, no errors found");
      done();
    });
  })
);

gulp.task("server", function() {
  console.log();
  console.log("### Starting local server");

  var WebServer = require("./test/webserver.js").WebServer;
  var server = new WebServer();
  server.port = 8888;
  server.start();
});

gulp.task("clean", function(done) {
  console.log();
  console.log("### Cleaning up project builds");

  rimraf(BUILD_DIR, done);
});

gulp.task("makefile", function() {
  var makefileContent = "help:\n\tgulp\n\n";
  var targetsNames = [];
  for (var i in target) {
    makefileContent += i + ":\n\tgulp " + i + "\n\n";
    targetsNames.push(i);
  }
  makefileContent += ".PHONY: " + targetsNames.join(" ") + "\n";
  return createStringSource("Makefile", makefileContent).pipe(gulp.dest("."));
});

gulp.task("importl10n", function(done) {
  var locales = require("./external/importL10n/locales.js");

  console.log();
  console.log("### Importing translations from mozilla-central");

  if (!fs.existsSync(L10N_DIR)) {
    fs.mkdirSync(L10N_DIR);
  }
  locales.downloadL10n(L10N_DIR, done);
});

gulp.task("gh-pages-prepare", function() {
  console.log();
  console.log("### Creating web site");

  rimraf.sync(GH_PAGES_DIR);

  // 'vfs' because web/viewer.html needs its BOM.
  return merge([
    vfs
      .src(GENERIC_DIR + "**/*", { base: GENERIC_DIR, stripBOM: false })
      .pipe(gulp.dest(GH_PAGES_DIR)),
    gulp
      .src("test/features/**/*", { base: "test/" })
      .pipe(gulp.dest(GH_PAGES_DIR)),
    gulp
      .src(JSDOC_BUILD_DIR + "**/*", { base: JSDOC_BUILD_DIR })
      .pipe(gulp.dest(GH_PAGES_DIR + "api/draft/")),
  ]);
});

gulp.task("wintersmith", function(done) {
  var wintersmith = require("wintersmith");
  var env = wintersmith("docs/config.json");
  env.build(GH_PAGES_DIR, function(error) {
    if (error) {
      done(error);
      return;
    }
    replaceInFile(
      GH_PAGES_DIR + "/getting_started/index.html",
      /STABLE_VERSION/g,
      config.stableVersion
    );
    replaceInFile(
      GH_PAGES_DIR + "/getting_started/index.html",
      /BETA_VERSION/g,
      config.betaVersion
    );

    // Hide the beta version button if there is only a stable version.
    const groupClass = config.betaVersion ? "btn-group-vertical centered" : "";
    const hiddenClass = config.betaVersion ? "" : "hidden";
    replaceInFile(
      GH_PAGES_DIR + "/getting_started/index.html",
      /GROUP_CLASS/g,
      groupClass
    );
    replaceInFile(
      GH_PAGES_DIR + "/getting_started/index.html",
      /HIDDEN_CLASS/g,
      hiddenClass
    );

    console.log("Done building with wintersmith.");
    done();
  });
});

gulp.task("gh-pages-git", function(done) {
  var VERSION = getVersionJSON().version;
  var reason = process.env["PDFJS_UPDATE_REASON"];

  safeSpawnSync("git", ["init"], { cwd: GH_PAGES_DIR });
  safeSpawnSync("git", ["remote", "add", "origin", REPO], {
    cwd: GH_PAGES_DIR,
  });
  safeSpawnSync("git", ["add", "-A"], { cwd: GH_PAGES_DIR });
  safeSpawnSync(
    "git",
    [
      "commit",
      "-am",
      "gh-pages site created via gulpfile.js script",
      "-m",
      "PDF.js version " + VERSION + (reason ? " - " + reason : ""),
    ],
    { cwd: GH_PAGES_DIR }
  );
  safeSpawnSync("git", ["branch", "-m", "gh-pages"], { cwd: GH_PAGES_DIR });

  console.log();
  console.log("Website built in " + GH_PAGES_DIR);
  done();
});

gulp.task(
  "web",
  gulp.series(
    "generic",
    "jsdoc",
    "gh-pages-prepare",
    "wintersmith",
    "gh-pages-git"
  )
);

gulp.task(
  "dist-pre",
  gulp.series(
    "generic",
    "components",
    "image_decoders",
    "lib",
    "minified",
    function() {
      var VERSION = getVersionJSON().version;

      console.log();
      console.log("### Cloning baseline distribution");

      rimraf.sync(DIST_DIR);
      mkdirp.sync(DIST_DIR);
      safeSpawnSync("git", ["clone", "--depth", "1", DIST_REPO_URL, DIST_DIR]);

      console.log();
      console.log("### Overwriting all files");
      rimraf.sync(path.join(DIST_DIR, "*"));

      // Rebuilding manifests
      var DIST_NAME = "pdfjs-dist";
      var DIST_DESCRIPTION = "Generic build of Mozilla's PDF.js library.";
      var DIST_KEYWORDS = ["Mozilla", "pdf", "pdf.js"];
      var DIST_HOMEPAGE = "http://mozilla.github.io/pdf.js/";
      var DIST_BUGS_URL = "https://github.com/mozilla/pdf.js/issues";
      var DIST_LICENSE = "Apache-2.0";
      var npmManifest = {
        name: DIST_NAME,
        version: VERSION,
        main: "build/pdf.js",
        description: DIST_DESCRIPTION,
        keywords: DIST_KEYWORDS,
        homepage: DIST_HOMEPAGE,
        bugs: DIST_BUGS_URL,
        license: DIST_LICENSE,
        browser: {
          fs: false,
          http: false,
          https: false,
          url: false,
          zlib: false,
        },
        format: "amd", // to not allow system.js to choose 'cjs'
        repository: {
          type: "git",
          url: DIST_REPO_URL,
        },
      };
      var packageJsonSrc = createStringSource(
        "package.json",
        JSON.stringify(npmManifest, null, 2)
      );
      var bowerManifest = {
        name: DIST_NAME,
        version: VERSION,
        main: ["build/pdf.js", "build/pdf.worker.js"],
        ignore: [],
        keywords: DIST_KEYWORDS,
      };
      var bowerJsonSrc = createStringSource(
        "bower.json",
        JSON.stringify(bowerManifest, null, 2)
      );

      return merge([
        packageJsonSrc.pipe(gulp.dest(DIST_DIR)),
        bowerJsonSrc.pipe(gulp.dest(DIST_DIR)),
        vfs
          .src("external/dist/**/*", { base: "external/dist", stripBOM: false })
          .pipe(gulp.dest(DIST_DIR)),
        gulp.src(GENERIC_DIR + "LICENSE").pipe(gulp.dest(DIST_DIR)),
        gulp
          .src(GENERIC_DIR + "web/cmaps/**/*", { base: GENERIC_DIR + "web" })
          .pipe(gulp.dest(DIST_DIR)),
        gulp
          .src([
            GENERIC_DIR + "build/pdf.js",
            GENERIC_DIR + "build/pdf.js.map",
            GENERIC_DIR + "build/pdf.worker.js",
            GENERIC_DIR + "build/pdf.worker.js.map",
            SRC_DIR + "pdf.worker.entry.js",
          ])
          .pipe(gulp.dest(DIST_DIR + "build/")),
        gulp
          .src(MINIFIED_DIR + "build/pdf.js")
          .pipe(rename("pdf.min.js"))
          .pipe(gulp.dest(DIST_DIR + "build/")),
        gulp
          .src(MINIFIED_DIR + "build/pdf.worker.js")
          .pipe(rename("pdf.worker.min.js"))
          .pipe(gulp.dest(DIST_DIR + "build/")),
        gulp
          .src(MINIFIED_DIR + "image_decoders/pdf.image_decoders.js")
          .pipe(rename("pdf.image_decoders.min.js"))
          .pipe(gulp.dest(DIST_DIR + "image_decoders/")),
        gulp
          .src(COMPONENTS_DIR + "**/*", { base: COMPONENTS_DIR })
          .pipe(gulp.dest(DIST_DIR + "web/")),
        gulp
          .src(IMAGE_DECODERS_DIR + "**/*", { base: IMAGE_DECODERS_DIR })
          .pipe(gulp.dest(DIST_DIR + "image_decoders")),
        gulp
          .src(LIB_DIR + "**/*", { base: LIB_DIR })
          .pipe(gulp.dest(DIST_DIR + "lib/")),
      ]);
    }
  )
);

gulp.task(
  "dist-install",
  gulp.series("dist-pre", function(done) {
    var distPath = DIST_DIR;
    var opts = {};
    var installPath = process.env["PDFJS_INSTALL_PATH"];
    if (installPath) {
      opts.cwd = installPath;
      distPath = path.relative(installPath, distPath);
    }
    safeSpawnSync("npm", ["install", distPath], opts);
    done();
  })
);

gulp.task(
  "dist-repo-git",
  gulp.series("dist-pre", function(done) {
    var VERSION = getVersionJSON().version;

    console.log();
    console.log("### Committing changes");

    var reason = process.env["PDFJS_UPDATE_REASON"];
    // Attempt to work-around the broken link, see https://github.com/mozilla/pdf.js/issues/10391
    if (typeof reason === "string") {
      var reasonParts = /^(See )(mozilla\/pdf\.js)@tags\/(v\d+\.\d+\.\d+)\s*$/.exec(
        reason
      );

      if (reasonParts) {
        reason =
          reasonParts[1] +
          "https://github.com/" +
          reasonParts[2] +
          "/releases/tag/" +
          reasonParts[3];
      }
    }
    var message = "PDF.js version " + VERSION + (reason ? " - " + reason : "");
    safeSpawnSync("git", ["add", "*"], { cwd: DIST_DIR });
    safeSpawnSync("git", ["commit", "-am", message], { cwd: DIST_DIR });
    safeSpawnSync("git", ["tag", "-a", "v" + VERSION, "-m", message], {
      cwd: DIST_DIR,
    });

    console.log();
    console.log("Done. Push with");
    console.log(
      "  cd " + DIST_DIR + "; git push --tags " + DIST_REPO_URL + " master"
    );
    console.log();
    done();
  })
);

gulp.task("dist", gulp.series("dist-repo-git"));

gulp.task(
  "mozcentralbaseline",
  gulp.series("baseline", function(done) {
    console.log();
    console.log("### Creating mozcentral baseline environment");

    // Create a mozcentral build.
    rimraf.sync(BASELINE_DIR + BUILD_DIR);

    var workingDirectory = path.resolve(process.cwd(), BASELINE_DIR);
    safeSpawnSync("gulp", ["mozcentral"], {
      env: process.env,
      cwd: workingDirectory,
      stdio: "inherit",
    });

    // Copy the mozcentral build to the mozcentral baseline directory.
    rimraf.sync(MOZCENTRAL_BASELINE_DIR);
    mkdirp.sync(MOZCENTRAL_BASELINE_DIR);

    gulp
      .src([BASELINE_DIR + BUILD_DIR + "mozcentral/**/*"])
      .pipe(gulp.dest(MOZCENTRAL_BASELINE_DIR))
      .on("end", function() {
        // Commit the mozcentral baseline.
        safeSpawnSync("git", ["init"], { cwd: MOZCENTRAL_BASELINE_DIR });
        safeSpawnSync("git", ["add", "."], { cwd: MOZCENTRAL_BASELINE_DIR });
        safeSpawnSync("git", ["commit", "-m", '"mozcentral baseline"'], {
          cwd: MOZCENTRAL_BASELINE_DIR,
        });
        done();
      });
  })
);

gulp.task(
  "mozcentraldiff",
  gulp.series("mozcentral", "mozcentralbaseline", function(done) {
    console.log();
    console.log("### Creating mozcentral diff");

    // Create the diff between the current mozcentral build and the
    // baseline mozcentral build, which both exist at this point.
    // The mozcentral baseline directory is a Git repository, so we
    // remove all files and copy the current mozcentral build files
    // into it to create the diff.
    rimraf.sync(MOZCENTRAL_BASELINE_DIR + "*");

    gulp
      .src([BUILD_DIR + "mozcentral/**/*"])
      .pipe(gulp.dest(MOZCENTRAL_BASELINE_DIR))
      .on("end", function() {
        safeSpawnSync("git", ["add", "-A"], { cwd: MOZCENTRAL_BASELINE_DIR });
        var diff = safeSpawnSync(
          "git",
          ["diff", "--binary", "--cached", "--unified=8"],
          { cwd: MOZCENTRAL_BASELINE_DIR }
        ).stdout;

        createStringSource(MOZCENTRAL_DIFF_FILE, diff)
          .pipe(gulp.dest(BUILD_DIR))
          .on("end", function() {
            console.log(
              "Result diff can be found at " + BUILD_DIR + MOZCENTRAL_DIFF_FILE
            );
            done();
          });
      });
  })
);

gulp.task("externaltest", function(done) {
  fancylog("Running test-fixtures.js");
  safeSpawnSync("node", ["external/builder/test-fixtures.js"], {
    stdio: "inherit",
  });
  fancylog("Running test-fixtures_esprima.js");
  safeSpawnSync("node", ["external/builder/test-fixtures_esprima.js"], {
    stdio: "inherit",
  });
  done();
});

gulp.task(
  "npm-test",
  gulp.series(gulp.parallel("lint", "externaltest"), "unittestcli")
);