Use Closure Compiler to compile to ES5 instead of Babel (#18449)

* Upgrade Closure There are newer versions but they don't yet have corresponding releases of google-closure-compiler-osx. * Configure build * Refactor ReactSymbols a bit Provides a little better output.
2026-09-24 17:02:27 +00:00 · 2020-04-01 12:08:37 -07:00
parent 7d9f0b2057
commit 7ac69e779a
5 changed files with 158 additions and 104 deletions
@@ -61,7 +61,7 @@
    "flow-bin": "0.97",
    "glob": "^7.1.6",
    "glob-stream": "^6.1.0",
-    "google-closure-compiler": "^20200112.0.0",
+    "google-closure-compiler": "^20200224.0.0",
    "gzip-size": "^5.1.1",
    "jasmine-check": "^1.0.0-rc.0",
    "jest": "^24.9.0",
@@ -9,51 +9,44 @@

 // The Symbol used to tag the ReactElement-like types. If there is no native Symbol
 // nor polyfill, then a plain number is used for performance.
-const hasSymbol = typeof Symbol === 'function' && Symbol.for;
+export let REACT_ELEMENT_TYPE = 0xeac7;
+export let REACT_PORTAL_TYPE = 0xeaca;
+export let REACT_FRAGMENT_TYPE = 0xeacb;
+export let REACT_STRICT_MODE_TYPE = 0xeacc;
+export let REACT_PROFILER_TYPE = 0xead2;
+export let REACT_PROVIDER_TYPE = 0xeacd;
+export let REACT_CONTEXT_TYPE = 0xeace;
+export let REACT_FORWARD_REF_TYPE = 0xead0;
+export let REACT_SUSPENSE_TYPE = 0xead1;
+export let REACT_SUSPENSE_LIST_TYPE = 0xead8;
+export let REACT_MEMO_TYPE = 0xead3;
+export let REACT_LAZY_TYPE = 0xead4;
+export let REACT_BLOCK_TYPE = 0xead9;
+export let REACT_SERVER_BLOCK_TYPE = 0xeada;
+export let REACT_FUNDAMENTAL_TYPE = 0xead5;
+export let REACT_RESPONDER_TYPE = 0xead6;
+export let REACT_SCOPE_TYPE = 0xead7;

-export const REACT_ELEMENT_TYPE = hasSymbol
-  ? Symbol.for('react.element')
-  : 0xeac7;
-export const REACT_PORTAL_TYPE = hasSymbol
-  ? Symbol.for('react.portal')
-  : 0xeaca;
-export const REACT_FRAGMENT_TYPE = hasSymbol
-  ? Symbol.for('react.fragment')
-  : 0xeacb;
-export const REACT_STRICT_MODE_TYPE = hasSymbol
-  ? Symbol.for('react.strict_mode')
-  : 0xeacc;
-export const REACT_PROFILER_TYPE = hasSymbol
-  ? Symbol.for('react.profiler')
-  : 0xead2;
-export const REACT_PROVIDER_TYPE = hasSymbol
-  ? Symbol.for('react.provider')
-  : 0xeacd;
-export const REACT_CONTEXT_TYPE = hasSymbol
-  ? Symbol.for('react.context')
-  : 0xeace;
-export const REACT_FORWARD_REF_TYPE = hasSymbol
-  ? Symbol.for('react.forward_ref')
-  : 0xead0;
-export const REACT_SUSPENSE_TYPE = hasSymbol
-  ? Symbol.for('react.suspense')
-  : 0xead1;
-export const REACT_SUSPENSE_LIST_TYPE = hasSymbol
-  ? Symbol.for('react.suspense_list')
-  : 0xead8;
-export const REACT_MEMO_TYPE = hasSymbol ? Symbol.for('react.memo') : 0xead3;
-export const REACT_LAZY_TYPE = hasSymbol ? Symbol.for('react.lazy') : 0xead4;
-export const REACT_BLOCK_TYPE = hasSymbol ? Symbol.for('react.block') : 0xead9;
-export const REACT_SERVER_BLOCK_TYPE = hasSymbol
-  ? Symbol.for('react.server.block')
-  : 0xeada;
-export const REACT_FUNDAMENTAL_TYPE = hasSymbol
-  ? Symbol.for('react.fundamental')
-  : 0xead5;
-export const REACT_RESPONDER_TYPE = hasSymbol
-  ? Symbol.for('react.responder')
-  : 0xead6;
-export const REACT_SCOPE_TYPE = hasSymbol ? Symbol.for('react.scope') : 0xead7;
+if (typeof Symbol === 'function' && Symbol.for) {
+  const symbolFor = Symbol.for;
+  REACT_ELEMENT_TYPE = symbolFor('react.element');
+  REACT_PORTAL_TYPE = symbolFor('react.portal');
+  REACT_FRAGMENT_TYPE = symbolFor('react.fragment');
+  REACT_STRICT_MODE_TYPE = symbolFor('react.strict_mode');
+  REACT_PROFILER_TYPE = symbolFor('react.profiler');
+  REACT_PROVIDER_TYPE = symbolFor('react.provider');
+  REACT_CONTEXT_TYPE = symbolFor('react.context');
+  REACT_FORWARD_REF_TYPE = symbolFor('react.forward_ref');
+  REACT_SUSPENSE_TYPE = symbolFor('react.suspense');
+  REACT_SUSPENSE_LIST_TYPE = symbolFor('react.suspense_list');
+  REACT_MEMO_TYPE = symbolFor('react.memo');
+  REACT_LAZY_TYPE = symbolFor('react.lazy');
+  REACT_BLOCK_TYPE = symbolFor('react.block');
+  REACT_SERVER_BLOCK_TYPE = symbolFor('react.server.block');
+  REACT_FUNDAMENTAL_TYPE = symbolFor('react.fundamental');
+  REACT_RESPONDER_TYPE = symbolFor('react.responder');
+  REACT_SCOPE_TYPE = symbolFor('react.scope');
+}

 const MAYBE_ITERATOR_SYMBOL = typeof Symbol === 'function' && Symbol.iterator;
 const FAUX_ITERATOR_SYMBOL = '@@iterator';
@@ -97,7 +97,7 @@ const errorCodeOpts = {

 const closureOptions = {
  compilation_level: 'SIMPLE',
-  language_in: 'ECMASCRIPT5_STRICT',
+  language_in: 'ECMASCRIPT_2015',
  language_out: 'ECMASCRIPT5_STRICT',
  env: 'CUSTOM',
  warning_level: 'QUIET',
@@ -105,8 +105,41 @@ const closureOptions = {
  use_types_for_optimization: false,
  process_common_js_modules: false,
  rewrite_polyfills: false,
+  inject_libraries: false,
 };

+// Non-ES2015 stuff applied before closure compiler.
+const babelPlugins = [
+  // These plugins filter out non-ES2015.
+  '@babel/plugin-transform-flow-strip-types',
+  ['@babel/plugin-proposal-class-properties', {loose: true}],
+  'syntax-trailing-function-commas',
+  // These use loose mode which avoids embedding a runtime.
+  // TODO: Remove object spread from the source. Prefer Object.assign instead.
+  [
+    '@babel/plugin-proposal-object-rest-spread',
+    {loose: true, useBuiltIns: true},
+  ],
+  ['@babel/plugin-transform-template-literals', {loose: true}],
+  // TODO: Remove for...of from the source. It requires a runtime to be embedded.
+  '@babel/plugin-transform-for-of',
+  // TODO: Remove array spread from the source. Prefer .apply instead.
+  ['@babel/plugin-transform-spread', {loose: true, useBuiltIns: true}],
+  '@babel/plugin-transform-parameters',
+  // TODO: Remove array destructuring from the source. Requires runtime.
+  ['@babel/plugin-transform-destructuring', {loose: true, useBuiltIns: true}],
+];
+
+const babelToES5Plugins = [
+  // These plugins transform DEV mode. Closure compiler deals with these in PROD.
+  '@babel/plugin-transform-literals',
+  '@babel/plugin-transform-arrow-functions',
+  '@babel/plugin-transform-block-scoped-functions',
+  '@babel/plugin-transform-shorthand-properties',
+  '@babel/plugin-transform-computed-properties',
+  ['@babel/plugin-transform-block-scoping', {throwIfClosureRequired: true}],
+];
+
 function getBabelConfig(
  updateBabelOptions,
  bundleType,
@@ -118,11 +151,14 @@ function getBabelConfig(
    packageName === 'react' || externals.indexOf('react') !== -1;
  let options = {
    exclude: '/**/node_modules/**',
+    babelrc: false,
+    configFile: false,
    presets: [],
-    plugins: [],
+    plugins: [...babelPlugins],
  };
  if (isDevelopment) {
    options.plugins.push(
+      ...babelToES5Plugins,
      // Turn console.error/warn() into a custom wrapper
      [
        require('../babel/transform-replace-console-calls'),
@@ -369,7 +405,7 @@ function getPlugins(
    stripBanner({
      exclude: 'node_modules/**/*',
    }),
-    // Compile to ES5.
+    // Compile to ES2015.
    babel(
      getBabelConfig(
        updateBabelOptions,
@@ -19,6 +19,16 @@ function compile(flags) {
  });
 }

+function encodeNativeCalls(code) {
+  // Closure Compiler tries to install a polyfill if we reference the Symbol global.
+  // We need to temporarily trick Closure that it's not the built-in it's looking for.
+  return code.replace(/Symbol/g, 'SymbolTmp');
+}
+
+function decodeNativeCalls(code) {
+  return code.replace(/SymbolTmp/g, 'Symbol');
+}
+
 module.exports = function closure(flags = {}) {
  return {
    name: 'scripts/rollup/plugins/closure-plugin',
@@ -26,10 +36,12 @@ module.exports = function closure(flags = {}) {
      const inputFile = tmp.fileSync();
      const tempPath = inputFile.name;
      flags = Object.assign({}, flags, {js: tempPath});
-      await writeFileAsync(tempPath, code, 'utf8');
+      const filteredCode = encodeNativeCalls(code);
+      await writeFileAsync(tempPath, filteredCode, 'utf8');
      const compiledCode = await compile(flags);
      inputFile.removeCallback();
-      return {code: compiledCode};
+      const decodedCode = decodeNativeCalls(compiledCode);
+      return {code: decodedCode};
    },
  };
 };
@@ -3609,18 +3609,18 @@ clone@^1.0.2:
  integrity sha1-2jCcwmPfFZlMaIypAheco8fNfH4=

 clone@^2.1.1:
-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/clone/-/clone-2.1.1.tgz#d217d1e961118e3ac9a4b8bba3285553bf647cdb"
-  integrity sha1-0hfR6WERjjrJpLi7oyhVU79kfNs=
+  version "2.1.2"
+  resolved "https://registry.yarnpkg.com/clone/-/clone-2.1.2.tgz#1b7f4b9f591f1e8f83670401600345a02887435f"
+  integrity sha1-G39Ln1kfHo+DZwQBYANFoCiHQ18=

 cloneable-readable@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/cloneable-readable/-/cloneable-readable-1.0.0.tgz#a6290d413f217a61232f95e458ff38418cfb0117"
-  integrity sha1-pikNQT8hemEjL5XkWP84QYz7ARc=
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/cloneable-readable/-/cloneable-readable-1.1.3.tgz#120a00cb053bfb63a222e709f9683ea2e11d8cec"
+  integrity sha512-2EF8zTQOxYq70Y4XKtorQupqF0m49MBz2/yf5Bj+MHjvpG3Hy7sImifnqD6UA+TKYxeSV+u6qqQPawN5UvnpKQ==
  dependencies:
    inherits "^2.0.1"
-    process-nextick-args "^1.0.6"
-    through2 "^2.0.1"
+    process-nextick-args "^2.0.0"
+    readable-stream "^2.3.5"

 co@^4.6.0:
  version "4.6.0"
@@ -3646,11 +3646,11 @@ collection-visit@^1.0.0:
    object-visit "^1.0.0"

 color-convert@^1.9.0:
-  version "1.9.0"
-  resolved "https://registry.yarnpkg.com/color-convert/-/color-convert-1.9.0.tgz#1accf97dd739b983bf994d56fec8f95853641b7a"
-  integrity sha1-Gsz5fdc5uYO/mU1W/sj5WFNkG3o=
+  version "1.9.3"
+  resolved "https://registry.yarnpkg.com/color-convert/-/color-convert-1.9.3.tgz#bb71850690e1f136567de629d2d5471deda4c1e8"
+  integrity sha512-QfAUtd+vFdAtFQcC8CCyYt1fYWxSqAiK2cSD6zDB8N3cpsEBAvRxp9zOGg6G/SHHJYAT88/az/IuDGALsNVbGg==
  dependencies:
-    color-name "^1.1.1"
+    color-name "1.1.3"

 color-convert@^2.0.1:
  version "2.0.1"
@@ -3659,7 +3659,7 @@ color-convert@^2.0.1:
  dependencies:
    color-name "~1.1.4"

-color-name@^1.1.1:
+[email protected].3:
  version "1.1.3"
  resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.3.tgz#a7d0558bd89c42f795dd42328f740831ca53bc25"
  integrity sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=
@@ -6377,46 +6377,46 @@ globby@^6.1.0:
    pify "^2.0.0"
    pinkie-promise "^2.0.0"

-google-closure-compiler-java@^20200112.0.0:
-  version "20200112.0.0"
-  resolved "https://registry.yarnpkg.com/google-closure-compiler-java/-/google-closure-compiler-java-20200112.0.0.tgz#2b99f5e2869a573a1b35558ff3b6e6bc054a116f"
-  integrity sha512-h/ExDCXAw88nOniQSbbK6et31kOwmaDxl6t52dnETCIzituQtGToPzy21vUel1o8o+FvWUybLoap+dEYBam1pA==
+google-closure-compiler-java@^20200224.0.0:
+  version "20200224.0.0"
+  resolved "https://registry.yarnpkg.com/google-closure-compiler-java/-/google-closure-compiler-java-20200224.0.0.tgz#03d71aefd0a07010fd8a7057d09c76f6729767bc"
+  integrity sha512-palFcDoScauZjWIsGDzMK6h+IctcRb55I3wJX8Ko/DTSz72xwadRdKm0lGt8OoYL7SKEO+IjgD7s8XrAGpLnlQ==

-google-closure-compiler-js@^20200112.0.0:
-  version "20200112.0.0"
-  resolved "https://registry.yarnpkg.com/google-closure-compiler-js/-/google-closure-compiler-js-20200112.0.0.tgz#cb9fc1636671f3ce927e668e29db69b65cae6f2d"
-  integrity sha512-xW47rSuiRaql6q1YN7+b3FXIW74b1nCcENVwm9cigw1H5gWoBMBJOmpZiXnjMfmYC+MALjPQ8giMzvSeP+2X5A==
+google-closure-compiler-js@^20200224.0.0:
+  version "20200224.0.0"
+  resolved "https://registry.yarnpkg.com/google-closure-compiler-js/-/google-closure-compiler-js-20200224.0.0.tgz#cf4b598abf7be686c683e530529756805b8af500"
+  integrity sha512-70VKN0kbnTRtu2dqxDjWZQGfEQIHj7b7oUUCsYPO5oEXCDfgxNc13oYUJXvrTONLRWlHCNl/I8FNrVOwZ3gY/g==

-google-closure-compiler-linux@^20200112.0.0:
-  version "20200112.0.0"
-  resolved "https://registry.yarnpkg.com/google-closure-compiler-linux/-/google-closure-compiler-linux-20200112.0.0.tgz#e6c7943cc0114046dbe9fc685e4d7d4eb536c1dc"
-  integrity sha512-imTfdYP7BVTzzp3y7MuZP+98nEkbX7LZsZtxalNpl56vd+Ysc9/vOHXS14CdSoThaXIVlzX/lfjOlBRqPow+ew==
+google-closure-compiler-linux@^20200224.0.0:
+  version "20200224.0.0"
+  resolved "https://registry.yarnpkg.com/google-closure-compiler-linux/-/google-closure-compiler-linux-20200224.0.0.tgz#d9608b224b4d8f38d4d34e99a24da54bca6b1902"
+  integrity sha512-/BaE889EPrXWOKJVolA9++e99xBDMzeFBf7zF7nBB8PUmU5DlvtsoLL82xnT6nbZC1ktHaETlVx+vYGju8zKBQ==

-google-closure-compiler-osx@^20200112.0.0:
-  version "20200112.0.0"
-  resolved "https://registry.yarnpkg.com/google-closure-compiler-osx/-/google-closure-compiler-osx-20200112.0.0.tgz#df7a22c0dc32702b47c8ac4521f79bbe439effad"
-  integrity sha512-E3S1KqZw4+Zov0VXCkjomPrYhyuuV6jH9InBchQ7cZfipFJjhQmSRf39u4Mu0sINW7GXfODZbzBwOXhEIquFQw==
+google-closure-compiler-osx@^20200224.0.0:
+  version "20200224.0.0"
+  resolved "https://registry.yarnpkg.com/google-closure-compiler-osx/-/google-closure-compiler-osx-20200224.0.0.tgz#aee62d8b878a662fc73b92419603168c0c3a35ed"
+  integrity sha512-WXVNW9nPUqjvCe38mUIlBGEPVPCTKLtdaXC+q+kQdonkJFHNrpdyYWa746Y8cNP/byQyDNpPsqcKseZTLh17sQ==

-google-closure-compiler-windows@^20200112.0.0:
-  version "20200112.0.0"
-  resolved "https://registry.yarnpkg.com/google-closure-compiler-windows/-/google-closure-compiler-windows-20200112.0.0.tgz#8300d1e651f2c84ed565e729ccf40d6ed7e63771"
-  integrity sha512-+5+UJFKXH0LGnYEHSVJxWwhtvX/MI6uebkAQkhma0057QsKs8fOToWuHL8/UbJULB4WUPa3DlHy0+Izs5z6lCQ==
+google-closure-compiler-windows@^20200224.0.0:
+  version "20200224.0.0"
+  resolved "https://registry.yarnpkg.com/google-closure-compiler-windows/-/google-closure-compiler-windows-20200224.0.0.tgz#cae323b898625ca57b0e87aaddde021a414dda58"
+  integrity sha512-l6w2D8r9+GC9CQTAYEMAuNI996Zb6YV5qG7+FR0gCoL6h6S3Mc7mi87bafgwaicsVcmmHE/9kCBuW4ZyTMs5Fg==

-google-closure-compiler@^20200112.0.0:
-  version "20200112.0.0"
-  resolved "https://registry.yarnpkg.com/google-closure-compiler/-/google-closure-compiler-20200112.0.0.tgz#98d79ed2926b5c9a04c759c3f0853f2102c06ba2"
-  integrity sha512-8d43B3hU2pAFy6MD946oslArRe11jPJ/h/VaPPiiSMoSMFxnDpd8jjVJfM2solFSNOOZ9OacA6g/RVGMyp5lvg==
+google-closure-compiler@^20200224.0.0:
+  version "20200224.0.0"
+  resolved "https://registry.yarnpkg.com/google-closure-compiler/-/google-closure-compiler-20200224.0.0.tgz#ec0e708d9716a48e12fff43fe37fa5cec732a283"
+  integrity sha512-V81dRYygdHbZtOtU16VX26xAdJBB1UZyfSg3OTzdNl3l/xEIx1D/L7TYUqjeTXsxcy+JruJ/UfUlIJAOaMRTog==
  dependencies:
    chalk "2.x"
-    google-closure-compiler-java "^20200112.0.0"
-    google-closure-compiler-js "^20200112.0.0"
+    google-closure-compiler-java "^20200224.0.0"
+    google-closure-compiler-js "^20200224.0.0"
    minimist "1.x"
    vinyl "2.x"
    vinyl-sourcemaps-apply "^0.2.0"
  optionalDependencies:
-    google-closure-compiler-linux "^20200112.0.0"
-    google-closure-compiler-osx "^20200112.0.0"
-    google-closure-compiler-windows "^20200112.0.0"
+    google-closure-compiler-linux "^20200224.0.0"
+    google-closure-compiler-osx "^20200224.0.0"
+    google-closure-compiler-windows "^20200224.0.0"

 got@^6.7.1:
  version "6.7.1"
@@ -8929,7 +8929,12 @@ [email protected]:
  resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
  integrity sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0=

-[email protected], minimist@^1.1.0, minimist@^1.1.1, minimist@^1.1.3, minimist@^1.2.0:
+[email protected]:
+  version "1.2.5"
+  resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.5.tgz#67d66014b66a6a8aaa0c083c5fd58df4e4e97602"
+  integrity sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==
+
+minimist@^1.1.0, minimist@^1.1.1, minimist@^1.1.3, minimist@^1.2.0:
  version "1.2.0"
  resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
  integrity sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=
@@ -10413,15 +10418,10 @@ [email protected]:
    request "^2.83.0"
    stream-parser "~0.3.1"

-process-nextick-args@^1.0.6:
-  version "1.0.7"
-  resolved "https://registry.yarnpkg.com/process-nextick-args/-/process-nextick-args-1.0.7.tgz#150e20b756590ad3f91093f25a4f2ad8bff30ba3"
-  integrity sha1-FQ4gt1ZZCtP5EJPyWk8q2L/zC6M=
-
-process-nextick-args@~2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/process-nextick-args/-/process-nextick-args-2.0.0.tgz#a37d732f4271b4ab1ad070d35508e8290788ffaa"
-  integrity sha512-MtEC1TqN0EU5nephaJ4rAtThHtC86dNN9qCuEhtshvpVBkAW5ZO7BASN9REnF9eoXGcRub+pFuKEpOHE+HbEMw==
+process-nextick-args@^2.0.0, process-nextick-args@~2.0.0:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/process-nextick-args/-/process-nextick-args-2.0.1.tgz#7820d9b16120cc55ca9ae7792680ae7dba6d7fe2"
+  integrity sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag==

 process@^0.11.0, process@^0.11.10, process@~0.11.0:
  version "0.11.10"
@@ -10822,7 +10822,7 @@ read-pkg@^3.0.0:
    normalize-package-data "^2.3.2"
    path-type "^3.0.0"

-"readable-stream@1 || 2", readable-stream@^2.0.0, readable-stream@^2.0.1, readable-stream@^2.0.2, readable-stream@^2.0.5, readable-stream@^2.0.6, readable-stream@^2.1.5, readable-stream@^2.2.2, readable-stream@^2.3.0, readable-stream@^2.3.3, readable-stream@^2.3.6, readable-stream@~2.3.6:
+"readable-stream@1 || 2", readable-stream@^2.0.0, readable-stream@^2.0.1, readable-stream@^2.0.2, readable-stream@^2.0.5, readable-stream@^2.0.6, readable-stream@^2.2.2, readable-stream@^2.3.0, readable-stream@^2.3.3, readable-stream@^2.3.6, readable-stream@~2.3.6:
  version "2.3.6"
  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.3.6.tgz#b11c27d88b8ff1fbe070643cf94b0c79ae1b0aaf"
  integrity sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==
@@ -10863,6 +10863,19 @@ readable-stream@3, readable-stream@^3.0.1, readable-stream@^3.0.6, readable-stre
    string_decoder "^1.1.1"
    util-deprecate "^1.0.1"

+readable-stream@^2.1.5, readable-stream@^2.3.5:
+  version "2.3.7"
+  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.3.7.tgz#1eca1cf711aef814c04f62252a36a62f6cb23b57"
+  integrity sha512-Ebho8K4jIbHAxnuxi7o42OrZgF/ZTNcsZj6nRKyUmkhLFq8CHItp/fy6hQZuZmP/n3yZ9VBUbp4zz/mX8hmYPw==
+  dependencies:
+    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"
+
 readdir-scoped-modules@^1.1.0:
  version "1.1.0"
  resolved "https://registry.yarnpkg.com/readdir-scoped-modules/-/readdir-scoped-modules-1.1.0.tgz#8d45407b4f870a0dcaebc0e28670d18e74514309"
@@ -12820,7 +12833,7 @@ through2-filter@^2.0.0:
    through2 "~2.0.0"
    xtend "~4.0.0"

-through2@^2.0.0, through2@^2.0.1, through2@~2.0.0:
+through2@^2.0.0, through2@~2.0.0:
  version "2.0.3"
  resolved "https://registry.yarnpkg.com/through2/-/through2-2.0.3.tgz#0004569b37c7c74ba39c43f3ced78d1ad94140be"
  integrity sha1-AARWmzfHx0ujnEPzzteNGtlBQL4=