43 lines
1.5 KiB
JavaScript
43 lines
1.5 KiB
JavaScript
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"use strict";
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const babel = require("@babel/core");
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module.exports = function injectCaller(opts, target) {
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if (!supportsCallerOption()) return opts;
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return Object.assign({}, opts, {
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caller: Object.assign({
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name: "babel-loader",
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// Provide plugins with insight into webpack target.
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// https://github.com/babel/babel-loader/issues/787
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target,
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// Webpack >= 2 supports ESM and dynamic import.
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supportsStaticESM: true,
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supportsDynamicImport: true,
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// Webpack 5 supports TLA behind a flag. We enable it by default
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// for Babel, and then webpack will throw an error if the experimental
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// flag isn't enabled.
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supportsTopLevelAwait: true
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}, opts.caller)
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});
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};
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// TODO: We can remove this eventually, I'm just adding it so that people have
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// a little time to migrate to the newer RCs of @babel/core without getting
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// hard-to-diagnose errors about unknown 'caller' options.
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let supportsCallerOptionFlag = undefined;
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function supportsCallerOption() {
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if (supportsCallerOptionFlag === undefined) {
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try {
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// Rather than try to match the Babel version, we just see if it throws
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// when passed a 'caller' flag, and use that to decide if it is supported.
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babel.loadPartialConfig({
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caller: undefined,
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babelrc: false,
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configFile: false
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});
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supportsCallerOptionFlag = true;
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} catch (err) {
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supportsCallerOptionFlag = false;
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}
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}
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return supportsCallerOptionFlag;
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}
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