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object rest spread useBuiltIns option (#4491)

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* feat(transform-object-rest-spread): add polyfill=false option to avoid extends helper

* object-rest-spread: add useBuiltIns option

* add test for invalid option
This commit is contained in:
Henry Zhu
2016-09-09 18:38:50 -04:00
committed by GitHub
parent 3d93a2ab9c
commit d2d34ba8e7
7 changed files with 48 additions and 1 deletions
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11
packages/babel-plugin-transform-object-rest-spread/src/index.js
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@@ -15,6 +15,11 @@ export default function ({ types: t }) {
ObjectExpression(path, file) {
if (!hasSpread(path.node)) return;
let useBuiltIns = file.opts.useBuiltIns || false;
if (typeof useBuiltIns !== "boolean") {
throw new Error("transform-object-rest-spread currently only accepts a boolean option for useBuiltIns (defaults to false)");
}
let args = [];
let props = [];
@@ -39,7 +44,11 @@ export default function ({ types: t }) {
args.unshift(t.objectExpression([]));
}
path.replaceWith(t.callExpression(file.addHelper("extends"), args));
const helper = useBuiltIns ?
t.memberExpression(t.identifier("Object"), t.identifier("assign")) :
file.addHelper("extends");
path.replaceWith(t.callExpression(helper, args));
}
}
};