69 lines
1.9 KiB
TypeScript
69 lines
1.9 KiB
TypeScript
/*
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* Babel preset to provide TypeScript support and module/nomodule for Nx.
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*/
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interface NxReactBabelPresetOptions {
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decorators?: {
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decoratorsBeforeExport?: boolean;
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legacy?: boolean;
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};
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classProperties?: {
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loose?: boolean;
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};
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}
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module.exports = function (api: any, options: NxReactBabelPresetOptions = {}) {
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api.assertVersion(7);
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const isModern = api.caller((caller) => caller?.isModern);
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return {
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presets: [
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// Support module/nomodule pattern.
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[
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require.resolve('@babel/preset-env'),
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{
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// Allow importing core-js in entrypoint and use browserlist to select polyfills.
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// This is needed for differential loading as well.
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useBuiltIns: 'entry',
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corejs: 3,
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// Do not transform modules to CJS
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modules: false,
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targets: isModern ? { esmodules: true } : undefined,
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bugfixes: true,
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// Exclude transforms that make all code slower
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exclude: ['transform-typeof-symbol'],
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},
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],
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require.resolve('@babel/preset-typescript'),
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],
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plugins: [
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require.resolve('babel-plugin-macros'),
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// Must use legacy decorators to remain compatible with TypeScript.
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[
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require.resolve('@babel/plugin-proposal-decorators'),
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options.decorators ?? { legacy: true },
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],
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[
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require.resolve('@babel/plugin-proposal-class-properties'),
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options.classProperties ?? { loose: true },
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],
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],
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overrides: [
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// Convert `const enum` to `enum`. The former cannot be supported by babel
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// but at least we can get it to not error out.
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{
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test: /\.tsx?$/,
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plugins: [
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[
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require.resolve('babel-plugin-const-enum'),
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{
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transform: 'removeConst',
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},
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],
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],
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},
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],
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};
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};
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