babel · existentialism · Mar 29, 2017 · Mar 28, 2017 · Mar 28, 2017 · Mar 28, 2017
diff --git a/data/built-ins.json b/data/built-ins.json
diff --git a/data/plugins.json b/data/plugins.json
@@ -6,7 +6,8 @@
     "safari": 10,
     "node": 6,
     "ios": 10,
-    "opera": 34
+    "opera": 34,
+    "electron": 0.36
   },
   "transform-es2015-block-scoped-functions": {
     "chrome": 41,
@@ -16,7 +17,8 @@
     "node": 4,
     "ie": 11,
     "ios": 10,
-    "opera": 28
+    "opera": 28,
+    "electron": 0.24
   },
   "transform-es2015-block-scoping": {
     "chrome": 49,
@@ -25,7 +27,8 @@
     "safari": 10,
     "node": 6,
     "ios": 10,
-    "opera": 36
+    "opera": 36,
+    "electron": 1
   },
   "transform-es2015-classes": {
     "chrome": 46,
@@ -34,7 +37,8 @@
     "safari": 10,
     "node": 5,
     "ios": 10,
-    "opera": 33
+    "opera": 33,
+    "electron": 0.36
   },
   "transform-es2015-computed-properties": {
     "chrome": 44,
@@ -43,7 +47,8 @@
     "safari": 8,
     "node": 4,
     "ios": 8,
-    "opera": 31
+    "opera": 31,
+    "electron": 0.31
   },
   "check-es2015-constants": {
     "chrome": 49,
@@ -52,7 +57,8 @@
     "safari": 10,
     "node": 6,
     "ios": 10,
-    "opera": 36
+    "opera": 36,
+    "electron": 1
   },
   "transform-es2015-destructuring": {
     "chrome": 51,
@@ -61,7 +67,8 @@
     "safari": 10,
     "node": 6.5,
     "ios": 10,
-    "opera": 38
+    "opera": 38,
+    "electron": 1.2
   },
   "transform-es2015-duplicate-keys": {
     "chrome": 42,
@@ -70,7 +77,8 @@
     "safari": 9,
     "node": 4,
     "ios": 9,
-    "opera": 29
+    "opera": 29,
+    "electron": 0.27
   },
   "transform-es2015-for-of": {
     "chrome": 51,
@@ -79,15 +87,17 @@
     "safari": 10,
     "node": 6.5,
     "ios": 10,
-    "opera": 38
+    "opera": 38,
+    "electron": 1.2
   },
   "transform-es2015-function-name": {
     "chrome": 51,
     "firefox": 53,
     "safari": 10,
     "node": 6.5,
     "ios": 10,
-    "opera": 38
+    "opera": 38,
+    "electron": 1.2
   },
   "transform-es2015-literals": {
     "chrome": 44,
@@ -96,7 +106,8 @@
     "safari": 9,
     "node": 4,
     "ios": 9,
-    "opera": 31
+    "opera": 31,
+    "electron": 0.31
   },
   "transform-es2015-object-super": {
     "chrome": 46,
@@ -105,7 +116,8 @@
     "safari": 10,
     "node": 5,
     "ios": 10,
-    "opera": 33
+    "opera": 33,
+    "electron": 0.36
   },
   "transform-es2015-parameters": {
     "chrome": 49,
@@ -114,7 +126,8 @@
     "safari": 10,
     "node": 6,
     "ios": 10,
-    "opera": 36
+    "opera": 36,
+    "electron": 1
   },
   "transform-es2015-shorthand-properties": {
     "chrome": 43,
@@ -123,7 +136,8 @@
     "safari": 9,
     "node": 4,
     "ios": 9,
-    "opera": 30
+    "opera": 30,
+    "electron": 0.29
   },
   "transform-es2015-spread": {
     "chrome": 46,
@@ -132,7 +146,8 @@
     "safari": 10,
     "node": 5,
     "ios": 10,
-    "opera": 33
+    "opera": 33,
+    "electron": 0.36
   },
   "transform-es2015-sticky-regex": {
     "chrome": 49,
@@ -141,7 +156,8 @@
     "safari": 10,
     "node": 6,
     "ios": 10,
-    "opera": 36
+    "opera": 36,
+    "electron": 1
   },
   "transform-es2015-template-literals": {
     "chrome": 41,
@@ -150,7 +166,8 @@
     "safari": 9,
     "node": 4,
     "ios": 9,
-    "opera": 28
+    "opera": 28,
+    "electron": 0.24
   },
   "transform-es2015-typeof-symbol": {
     "chrome": 38,
@@ -160,7 +177,8 @@
     "node": 0.12,
     "android": 5.1,
     "ios": 9,
-    "opera": 25
+    "opera": 25,
+    "electron": 0.2
   },
   "transform-es2015-unicode-regex": {
     "chrome": 50,
@@ -169,7 +187,8 @@
     "safari": 10,
     "node": 6,
     "ios": 10,
-    "opera": 37
+    "opera": 37,
+    "electron": 1.1
   },
   "transform-regenerator": {
     "chrome": 50,
@@ -178,22 +197,25 @@
     "safari": 10,
     "node": 6,
     "ios": 10,
-    "opera": 37
+    "opera": 37,
+    "electron": 1.1
   },
   "transform-exponentiation-operator": {
     "chrome": 52,
     "edge": 14,
     "firefox": 52,
     "safari": 10.1,
     "node": 7,
-    "opera": 39
+    "opera": 39,
+    "electron": 1.3
   },
   "transform-async-to-generator": {
     "chrome": 55,
     "firefox": 52,
     "safari": 10.1,
     "node": 7.6,
-    "opera": 42
+    "opera": 42,
+    "electron": 1.6
   },
   "syntax-trailing-function-commas": {
     "chrome": 58,

diff --git a/package.json b/package.json
@@ -49,7 +49,6 @@
     "babel-plugin-transform-exponentiation-operator": "^6.22.0",
     "babel-plugin-transform-regenerator": "^6.22.0",
     "browserslist": "^1.4.0",
-    "electron-to-chromium": "^1.2.6",
     "invariant": "^2.2.2"
   },
   "devDependencies": {
@@ -71,6 +70,7 @@
     "lodash": "^4.17.4",
     "mocha": "^3.2.0",
     "nyc": "^10.1.2",
+    "electron-to-chromium": "^1.2.8",
     "rimraf": "^2.6.1"
   },
   "babel": {

diff --git a/scripts/build-data.js b/scripts/build-data.js
@@ -7,9 +7,34 @@ const flatten = require("lodash/flatten");
 const flattenDeep = require("lodash/flattenDeep");
 const mapValues = require("lodash/mapValues");
 const pickBy = require("lodash/pickBy");
+const electronToChromiumVersions = require("electron-to-chromium").versions;
 const pluginFeatures = require("../data/plugin-features");
 const builtInFeatures = require("../data/built-in-features");
 
+const electronToChromiumKeys = Object.keys(electronToChromiumVersions).reverse();
+
+const chromiumToElectronMap = electronToChromiumKeys.reduce(
+  (all, electron) => {
+    all[electronToChromiumVersions[electron]] = +electron;
+    return all;
+  }
+, {});
+const chromiumToElectronVersions = Object.keys(chromiumToElectronMap);
+
+const findClosestElectronVersion = (targetVersion) => {
+  const chromiumVersionsLength = chromiumToElectronVersions.length;
+  const maxChromium = +chromiumToElectronVersions[chromiumVersionsLength - 1];
+  if (targetVersion > maxChromium) return null;
+
+  const closestChrome = chromiumToElectronVersions.find(
+    (version) => targetVersion <= version
+  );
+  return chromiumToElectronMap[closestChrome];
+};
+
+const chromiumToElectron = (chromium) =>
+  chromiumToElectronMap[chromium] || findClosestElectronVersion(chromium);
+
 const renameTests = (tests, getName) =>
   tests.map((test) => Object.assign({}, test, { name: getName(test.name) }));
 
@@ -219,6 +244,10 @@ const generateData = (environments, features) => {
       } else if (plugin.chrome === 5) {
         plugin.opera = 12;
       }
+      const electronVersion = chromiumToElectron(plugin.chrome);
+      if (electronVersion) {
+        plugin.electron = electronVersion;
+      }
     }
 
     return plugin;

diff --git a/src/index.js b/src/index.js
@@ -2,7 +2,7 @@ import browserslist from "browserslist";
 import builtInsList from "../data/built-ins.json";
 import { defaultWebIncludes } from "./default-includes";
 import moduleTransformations from "./module-transformations";
-import normalizeOptions, { getElectronChromeVersion } from "./normalize-options.js";
+import normalizeOptions from "./normalize-options.js";
 import pluginList from "../data/plugins.json";
 import transformPolyfillRequirePlugin from "./transform-polyfill-require-plugin";
 
@@ -104,17 +104,6 @@ export const getTargets = (targets = {}) => {
     delete targetOpts.uglify;
   }
 
-  // Replace Electron target with its Chrome equivalent
-  if (targetOpts.electron) {
-    const electronChromeVersion = getElectronChromeVersion(targetOpts.electron);
-
-    targetOpts.chrome = targetOpts.chrome
-      ? Math.min(targetOpts.chrome, electronChromeVersion)
-      : electronChromeVersion;
-
-    delete targetOpts.electron;
-  }
-
   const browserOpts = targetOpts.browsers;
   if (isBrowsersQueryValid(browserOpts)) {
     const queryBrowsers = getLowestVersions(browserslist(browserOpts));

diff --git a/src/normalize-options.js b/src/normalize-options.js
@@ -1,5 +1,4 @@
 import invariant from "invariant";
-import { electronToChromium } from "electron-to-chromium";
 import builtInsList from "../data/built-ins.json";
 import { defaultWebIncludes } from "./default-includes";
 import moduleTransformations from "./module-transformations";
@@ -70,17 +69,6 @@ export const validateModulesOption = (modulesOpt = "commonjs") => {
   return modulesOpt;
 };
 
-export const getElectronChromeVersion = (electronVersion) => {
-  const electronChromeVersion = parseInt(electronToChromium(electronVersion), 10);
-
-  invariant(
-    !!electronChromeVersion,
-    `Electron version ${electronVersion} is either too old or too new`
-  );
-
-  return electronChromeVersion;
-};
-
 export default function normalizeOptions(opts) {
   // TODO: remove whitelist in favor of include in next major
   if (opts.whitelist && !hasBeenWarned) {

diff --git a/test/debug-fixtures/electron/options.json b/test/debug-fixtures/electron/options.json
@@ -0,0 +1,11 @@
+{
+  "presets": [
+    ["../../lib", {
+      "debug": true,
+      "targets": {
+        "electron": 0.36
+      },
+      "useBuiltIns": true
+    }]
+  ]
+}