81 lines
2.1 KiB
JavaScript
81 lines
2.1 KiB
JavaScript
"use strict";
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module.exports = function(api) {
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const env = api.env();
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const includeCoverage = process.env.BABEL_COVERAGE === "true";
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const envOpts = {
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loose: true,
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modules: false,
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exclude: ["transform-typeof-symbol"],
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};
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let convertESM = true;
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switch (env) {
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// Configs used during bundling builds.
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case "babylon":
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case "standalone":
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convertESM = false;
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break;
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case "production":
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// Config during builds before publish.
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break;
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case "development":
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envOpts.debug = true;
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envOpts.targets = {
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node: "current",
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};
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break;
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case "test":
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envOpts.targets = {
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node: "current",
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};
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break;
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}
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const config = {
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comments: false,
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presets: [["@babel/env", envOpts]],
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plugins: [
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// TODO: Use @babel/preset-flow when
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// https://github.com/babel/babel/issues/7233 is fixed
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"@babel/plugin-transform-flow-strip-types",
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["@babel/proposal-class-properties", { loose: true }],
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"@babel/proposal-export-namespace-from",
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"@babel/proposal-numeric-separator",
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["@babel/proposal-object-rest-spread", { useBuiltIns: true }],
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// Explicitly use the lazy version of CommonJS modules.
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convertESM ? ["@babel/transform-modules-commonjs", { lazy: true }] : null,
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].filter(Boolean),
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overrides: [
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{
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test: "packages/babylon",
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plugins: [
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"babel-plugin-transform-charcodes",
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["@babel/transform-for-of", { assumeArray: true }],
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],
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},
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{
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test: "./packages/babel-register",
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plugins: [
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// Override the root options to disable lazy imports for babel-register
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// because otherwise the require hook will try to lazy-import things
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// leading to dependency cycles.
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convertESM ? "@babel/transform-modules-commonjs" : null,
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].filter(Boolean),
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},
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],
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};
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// we need to do this as long as we do not test everything from source
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if (includeCoverage) {
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config.auxiliaryCommentBefore = "istanbul ignore next";
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config.plugins.push("babel-plugin-istanbul");
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}
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return config;
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};
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