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Use the
babel-plugin-polyfill-*
packages in preset-env
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// @flow | ||
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import { getImportSource, getRequireSource, isPolyfillSource } from "./utils"; | ||
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import type { NodePath } from "@babel/traverse"; | ||
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const BABEL_POLYFILL_DEPRECATION = ` | ||
\`@babel/polyfill\` is deprecated. Please, use required parts of \`core-js\` | ||
and \`regenerator-runtime/runtime\` separately`; | ||
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const NO_DIRECT_POLYFILL_IMPORT = ` | ||
When setting \`useBuiltIns: 'usage'\`, polyfills are automatically imported when needed. | ||
Please remove the direct import of \`SPECIFIER\` or use \`useBuiltIns: 'entry'\` instead.`; | ||
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export default function ({ template }, { regenerator, deprecated, usage }) { | ||
return { | ||
name: "preset-env/replace-babel-polyfill", | ||
visitor: { | ||
ImportDeclaration(path: NodePath) { | ||
const src = getImportSource(path); | ||
if (usage && isPolyfillSource(src)) { | ||
console.warn(NO_DIRECT_POLYFILL_IMPORT.replace("SPECIFIER", src)); | ||
if (!deprecated) path.remove(); | ||
} else if (src === "@babel/polyfill") { | ||
if (deprecated) { | ||
console.warn(BABEL_POLYFILL_DEPRECATION); | ||
} else if (regenerator) { | ||
path.replaceWithMultiple(template.ast` | ||
import "core-js"; | ||
import "regenerator-runtime/runtime.js"; | ||
`); | ||
} else { | ||
path.replaceWith(template.ast` | ||
import "core-js"; | ||
`); | ||
} | ||
} | ||
}, | ||
Program(path: NodePath) { | ||
path.get("body").forEach(bodyPath => { | ||
const src = getRequireSource(bodyPath); | ||
if (usage && isPolyfillSource(src)) { | ||
console.warn(NO_DIRECT_POLYFILL_IMPORT.replace("SPECIFIER", src)); | ||
if (!deprecated) bodyPath.remove(); | ||
} else if (src === "@babel/polyfill") { | ||
if (deprecated) { | ||
console.warn(BABEL_POLYFILL_DEPRECATION); | ||
} else if (regenerator) { | ||
bodyPath.replaceWithMultiple(template.ast` | ||
require("core-js"); | ||
require("regenerator-runtime/runtime.js"); | ||
`); | ||
} else { | ||
bodyPath.replaceWith(template.ast` | ||
require("core-js"); | ||
`); | ||
} | ||
} | ||
}); | ||
}, | ||
}, | ||
}; | ||
} |
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