Add forceAllTranforms option and deprecate Uglify target

Author: existentialism

README.md

@@ -120,16 +120,6 @@ A query to select browsers (ex: last 2 versions, > 5%) using [browserslist](http
 
 Note, browsers' results are overridden by explicit items from `targets`.
 
-### `targets.uglify`
-
-`number | true`
-
-UglifyJS does not currently support any ES6 syntax, so if you are using Uglify to minify your code, targeting later browsers may cause Uglify to throw syntax errors.
-
-To prevent these errors - specify the uglify option, which will enable all plugins and, as a result, fully compile your code to ES5. However, the `useBuiltIns` option will still work as before, and only include the polyfills that your target(s) need.
-
-> NOTE: Uglify has a work-in-progress "Harmony" branch to address the lack of ES6 support, but it is not yet stable.  You can follow its progress in [UglifyJS2 issue #448](https://github.com/mishoo/UglifyJS2/issues/448).  If you require an alternative minifier which _does_ support ES6 syntax, we recommend using [Babili](https://github.com/babel/babili).
-
 ### `spec`
 
 `boolean`, defaults to `false`.
@@ -259,6 +249,47 @@ import "babel-polyfill/core-js/modules/es7.string.pad-end";
 
 Don't add polyfills automatically per file, or transform `import "babel-polyfill"` to individual polyfills.
 
+### `forceAllTransforms`
+
+`boolean`, defaults to `false`.
+
+<p><details>
+  <summary><b>Example</b></summary>
+
+  With Babel 7's .babelrc.js support, you can force all transforms to be run if env is set to `production`.
+
+  ```js
+  module.exports = {
+    presets: [
+      ["env", {
+        targets: {
+          chrome: 59,
+          edge: 13,
+          firefox: 50,
+        },
+        // for uglifyjs...
+        forceAllTransforms: process.env === "production"
+      }],
+    ],
+  };
+  ```
+</details></p>
+
+
+> NOTE: `targets.uglify` is deprecated and will be removed in the next major in
+favor of this.
+
+By default, this preset will run all the transforms needed for the targeted
+environment(s). Enable this option if you want to force running _all_
+transforms, which is useful if the output will be run through UglifyJS or an
+environment that only supports ES5.
+
+> NOTE: Uglify has a work-in-progress "Harmony" branch to address the lack of
+ES6 support, but it is not yet stable.  You can follow its progress in
+[UglifyJS2 issue #448](https://github.com/mishoo/UglifyJS2/issues/448).  If you
+require an alternative minifier which _does_ support ES6 syntax, we recommend
+using [Babili](https://github.com/babel/babili).
+
 ---
 
 ## Examples

src/index.js

@@ -107,18 +107,42 @@ const filterItems = (list, includes, excludes, targets, defaultItems) => {
 };
 
 export default function buildPreset(context, opts = {}) {
-  const validatedOptions = normalizeOptions(opts);
-  const { debug, loose, moduleType, spec, useBuiltIns } = validatedOptions;
+  const {
+    debug,
+    exclude: optionsExclude,
+    forceAllTransforms,
+    include: optionsInclude,
+    loose,
+    moduleType,
+    spec,
+    targets: optionsTargets,
+    useBuiltIns,
+  } = normalizeOptions(opts);
+
+  // TODO: remove this in next major
+  let hasUglifyTarget = false;
+
+  if (optionsTargets && optionsTargets.uglify) {
+    hasUglifyTarget = true;
+    delete optionsTargets.uglify;
 
-  const targets = getTargets(validatedOptions.targets);
-  const include = transformIncludesAndExcludes(validatedOptions.include);
-  const exclude = transformIncludesAndExcludes(validatedOptions.exclude);
+    console.log("");
+    console.log("The uglify target has been deprecated. Set the top level");
+    console.log("option `forceAllTransforms: true` instead.");
+    console.log("");
+  }
+
+  const targets = getTargets(optionsTargets);
+  const include = transformIncludesAndExcludes(optionsInclude);
+  const exclude = transformIncludesAndExcludes(optionsExclude);
+
+  const transformTargets = forceAllTransforms || hasUglifyTarget ? {} : targets;
 
   const transformations = filterItems(
     pluginList,
     include.plugins,
     exclude.plugins,
-    targets,
+    transformTargets,
   );
 
   let polyfills;

src/normalize-options.js

@@ -57,9 +57,13 @@ export const validateBoolOption = (name, value, defaultValue) => {
 
 export const validateLooseOption = looseOpt =>
   validateBoolOption("loose", looseOpt, false);
+
 export const validateSpecOption = specOpt =>
   validateBoolOption("spec", specOpt, false);
 
+export const validateForceAllTransformsOption = forceAllTransforms =>
+  validateBoolOption("forceAllTransforms", forceAllTransforms, false);
+
 export const validateModulesOption = (modulesOpt = "commonjs") => {
   invariant(
     modulesOpt === false ||
@@ -97,6 +101,9 @@ export default function normalizeOptions(opts) {
   return {
     debug: opts.debug,
     exclude: validateIncludesAndExcludes(opts.exclude, "exclude"),
+    forceAllTransforms: validateForceAllTransformsOption(
+      opts.forceAllTransforms,
+    ),
     include: validateIncludesAndExcludes(opts.include, "include"),
     loose: validateLooseOption(opts.loose),
     moduleType: validateModulesOption(opts.modules),

src/targets-parser.js

@@ -26,30 +26,27 @@ const semverMin = (first: ?string, second: string): string => {
 };
 
 const getLowestVersions = browsers => {
-  return browsers.reduce(
-    (all, browser) => {
-      const [browserName, browserVersion] = browser.split(" ");
-      const normalizedBrowserName = browserNameMap[browserName];
+  return browsers.reduce((all, browser) => {
+    const [browserName, browserVersion] = browser.split(" ");
+    const normalizedBrowserName = browserNameMap[browserName];
 
-      if (!normalizedBrowserName) {
-        return all;
-      }
+    if (!normalizedBrowserName) {
+      return all;
+    }
 
-      try {
-        // Browser version can return as "10.0-10.2"
-        const splitVersion = browserVersion.split("-")[0];
-        const parsedBrowserVersion = semverify(splitVersion);
+    try {
+      // Browser version can return as "10.0-10.2"
+      const splitVersion = browserVersion.split("-")[0];
+      const parsedBrowserVersion = semverify(splitVersion);
 
-        all[normalizedBrowserName] = semverMin(
-          all[normalizedBrowserName],
-          parsedBrowserVersion,
-        );
-      } catch (e) {}
+      all[normalizedBrowserName] = semverMin(
+        all[normalizedBrowserName],
+        parsedBrowserVersion,
+      );
+    } catch (e) {}
 
-      return all;
-    },
-    {},
-  );
+    return all;
+  }, {});
 };
 
 const outputDecimalWarning = (decimalTargets: Array<Object>): void => {
@@ -60,7 +57,8 @@ const outputDecimalWarning = (decimalTargets: Array<Object>): void => {
   console.log("Warning, the following targets are using a decimal version:");
   console.log("");
   decimalTargets.forEach(({ target, value }) =>
-    console.log(`  ${target}: ${value}`));
+    console.log(`  ${target}: ${value}`),
+  );
   console.log("");
   console.log(
     "We recommend using a string for minor/patch versions to avoid numbers like 6.10",
@@ -81,6 +79,7 @@ const targetParserMap = {
     return [target, parsed];
   },
 
+  // TODO: Remove in next version.
   // Only valid value for Uglify is `true`
   uglify: (target, value) => [target, value === true],
 };

test/debug-fixtures/builtins-uglify/stdout.txt

@@ -1,37 +1,39 @@
+The uglify target has been deprecated. Set the top level
+option `forceAllTransforms: true` instead.
+
 babel-preset-env: `DEBUG` option
 
 Using targets:
 {
-  "chrome": "55",
-  "uglify": true
+  "chrome": "55"
 }
 
 Modules transform: false
 
 Using plugins:
-  check-es2015-constants {"uglify":true}
-  transform-es2015-arrow-functions {"uglify":true}
-  transform-es2015-block-scoped-functions {"uglify":true}
-  transform-es2015-block-scoping {"uglify":true}
-  transform-es2015-classes {"uglify":true}
-  transform-es2015-computed-properties {"uglify":true}
-  transform-es2015-destructuring {"uglify":true}
-  transform-es2015-duplicate-keys {"uglify":true}
-  transform-es2015-for-of {"uglify":true}
-  transform-es2015-function-name {"uglify":true}
-  transform-es2015-literals {"uglify":true}
-  transform-es2015-object-super {"uglify":true}
-  transform-es2015-parameters {"uglify":true}
-  transform-es2015-shorthand-properties {"uglify":true}
-  transform-es2015-spread {"uglify":true}
-  transform-es2015-sticky-regex {"uglify":true}
-  transform-es2015-template-literals {"uglify":true}
-  transform-es2015-typeof-symbol {"uglify":true}
-  transform-es2015-unicode-regex {"uglify":true}
-  transform-regenerator {"uglify":true}
-  transform-exponentiation-operator {"uglify":true}
-  transform-async-to-generator {"uglify":true}
-  syntax-trailing-function-commas {"chrome":"55","uglify":true}
+  check-es2015-constants {}
+  transform-es2015-arrow-functions {}
+  transform-es2015-block-scoped-functions {}
+  transform-es2015-block-scoping {}
+  transform-es2015-classes {}
+  transform-es2015-computed-properties {}
+  transform-es2015-destructuring {}
+  transform-es2015-duplicate-keys {}
+  transform-es2015-for-of {}
+  transform-es2015-function-name {}
+  transform-es2015-literals {}
+  transform-es2015-object-super {}
+  transform-es2015-parameters {}
+  transform-es2015-shorthand-properties {}
+  transform-es2015-spread {}
+  transform-es2015-sticky-regex {}
+  transform-es2015-template-literals {}
+  transform-es2015-typeof-symbol {}
+  transform-es2015-unicode-regex {}
+  transform-regenerator {}
+  transform-exponentiation-operator {}
+  transform-async-to-generator {}
+  syntax-trailing-function-commas {"chrome":"55"}
 
 Polyfills
 =========

test/debug-fixtures/force-all-transforms/options.json

@@ -0,0 +1,13 @@
+{
+  "presets": [
+    ["../../lib", {
+      "debug": true,
+      "modules": false,
+      "targets": {
+        "chrome": 55
+      },
+      "useBuiltIns": "entry",
+      "forceAllTransforms": true
+    }]
+  ]
+}

test/debug-fixtures/force-all-transforms/stdout.txt

@@ -0,0 +1,44 @@
+babel-preset-env: `DEBUG` option
+
+Using targets:
+{
+  "chrome": "55"
+}
+
+Modules transform: false
+
+Using plugins:
+  check-es2015-constants {}
+  transform-es2015-arrow-functions {}
+  transform-es2015-block-scoped-functions {}
+  transform-es2015-block-scoping {}
+  transform-es2015-classes {}
+  transform-es2015-computed-properties {}
+  transform-es2015-destructuring {}
+  transform-es2015-duplicate-keys {}
+  transform-es2015-for-of {}
+  transform-es2015-function-name {}
+  transform-es2015-literals {}
+  transform-es2015-object-super {}
+  transform-es2015-parameters {}
+  transform-es2015-shorthand-properties {}
+  transform-es2015-spread {}
+  transform-es2015-sticky-regex {}
+  transform-es2015-template-literals {}
+  transform-es2015-typeof-symbol {}
+  transform-es2015-unicode-regex {}
+  transform-regenerator {}
+  transform-exponentiation-operator {}
+  transform-async-to-generator {}
+  syntax-trailing-function-commas {"chrome":"55"}
+
+Polyfills
+=========
+
+Replaced `babel-polyfill` with the following polyfills:
+  es7.string.pad-start {"chrome":"55"}
+  es7.string.pad-end {"chrome":"55"}
+  web.timers {"chrome":"55"}
+  web.immediate {"chrome":"55"}
+  web.dom.iterable {"chrome":"55"}
+src/in.js -> lib/in.js