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use a Set

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This commit is contained in:
Henry Zhu 2017-04-06 11:59:41 -04:00
parent a48cf8b53f
commit 88d4df437e
2 changed files with 6 additions and 3 deletions
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5
experimental/babel-preset-env/src/index.js
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@ -243,7 +243,10 @@ export default function buildPreset(context, opts = {}) {
); );
if (useBuiltIns === true) { if (useBuiltIns === true) {
plugins.push([addUsedBuiltInsPlugin, { polyfills, regenerator, debug }]); plugins.push([
addUsedBuiltInsPlugin,
{ polyfills: new Set(polyfills), regenerator, debug },
]);
} else if (useBuiltIns === "entry") { } else if (useBuiltIns === "entry") {
plugins.push([useBuiltInsEntryPlugin, { polyfills, regenerator }]); plugins.push([useBuiltInsEntryPlugin, { polyfills, regenerator }]);
} }

4
experimental/babel-preset-env/src/use-built-ins-plugin.js
View File

@ -38,12 +38,12 @@ export default function({ types: t }) {
function addUnsupported(path, polyfills, builtIn, builtIns) { function addUnsupported(path, polyfills, builtIn, builtIns) {
if (Array.isArray(builtIn)) { if (Array.isArray(builtIn)) {
for (const i of builtIn) { for (const i of builtIn) {
if (polyfills.indexOf(i) !== -1) { if (polyfills.has(i)) {
addImport(path, `core-js/modules/${i}`, builtIns); addImport(path, `core-js/modules/${i}`, builtIns);
} }
} }
} else { } else {
if (polyfills.indexOf(builtIn) !== -1) { if (polyfills.has(builtIn)) {
addImport(path, `core-js/modules/${builtIn}`, builtIns); addImport(path, `core-js/modules/${builtIn}`, builtIns);
} }
} }