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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;
} |