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