42 lines
1.2 KiB
JavaScript
42 lines
1.2 KiB
JavaScript
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const babel = require("@babel/core");
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const {
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promisify
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} = require("util");
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const LoaderError = require("./Error");
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const transform = promisify(babel.transform);
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module.exports = async function (source, options) {
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let result;
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try {
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result = await transform(source, options);
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} catch (err) {
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throw err.message && err.codeFrame ? new LoaderError(err) : err;
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}
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if (!result) return null;
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// We don't return the full result here because some entries are not
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// really serializable. For a full list of properties see here:
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// https://github.com/babel/babel/blob/main/packages/babel-core/src/transformation/index.js
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// For discussion on this topic see here:
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// https://github.com/babel/babel-loader/pull/629
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const {
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ast,
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code,
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map,
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metadata,
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sourceType,
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externalDependencies
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} = result;
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if (map && (!map.sourcesContent || !map.sourcesContent.length)) {
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map.sourcesContent = [source];
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}
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return {
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ast,
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code,
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map,
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metadata,
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sourceType,
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// Convert it from a Set to an Array to make it JSON-serializable.
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externalDependencies: Array.from(externalDependencies || [])
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};
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};
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module.exports.version = babel.version;
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