/
babel.config.js
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babel.config.js
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"use strict";
const path = require("path");
function normalize(src) {
return src.replace(/\//, path.sep);
}
module.exports = function (api) {
const env = api.env();
const includeCoverage = process.env.BABEL_COVERAGE === "true";
const envOptsNoTargets = {
loose: true,
shippedProposals: true,
modules: false,
};
const envOpts = Object.assign({}, envOptsNoTargets);
let convertESM = true;
let ignoreLib = true;
let includeRegeneratorRuntime = false;
let polyfillRequireResolve = false;
let transformRuntimeOptions;
const nodeVersion = "6.9";
// The vast majority of our src files are modules, but we use
// unambiguous to keep things simple until we get around to renaming
// the modules to be more easily distinguished from CommonJS
const unambiguousSources = [
"packages/*/src",
"packages/*/test",
"codemods/*/src",
"codemods/*/test",
"eslint/*/src",
"eslint/*/test",
];
switch (env) {
// Configs used during bundling builds.
case "standalone":
includeRegeneratorRuntime = true;
unambiguousSources.push("packages/babel-runtime/regenerator");
// fall through
case "rollup":
convertESM = false;
ignoreLib = false;
// rollup-commonjs will converts node_modules to ESM
unambiguousSources.push(
"**/node_modules",
"packages/babel-preset-env/data",
"packages/babel-compat-data"
);
if (env === "rollup") envOpts.targets = { node: nodeVersion };
polyfillRequireResolve = true;
break;
case "test-legacy": // In test-legacy environment, we build babel on latest node but test on minimum supported legacy versions
case "production":
// Config during builds before publish.
envOpts.targets = {
node: nodeVersion,
};
polyfillRequireResolve = true;
break;
case "development":
envOpts.debug = true;
envOpts.targets = {
node: "current",
};
break;
case "test":
envOpts.targets = {
node: "current",
};
break;
}
if (process.env.STRIP_BABEL_8_FLAG && bool(process.env.BABEL_8_BREAKING)) {
// Never apply polyfills when compiling for Babel 8
polyfillRequireResolve = false;
}
if (includeRegeneratorRuntime) {
const babelRuntimePkgPath = require.resolve("@babel/runtime/package.json");
transformRuntimeOptions = {
helpers: false, // Helpers are handled by rollup when needed
regenerator: true,
version: require(babelRuntimePkgPath).version,
};
}
const config = {
// Our dependencies are all standard CommonJS, along with all sorts of
// other random files in Babel's codebase, so we use script as the default,
// and then mark actual modules as modules farther down.
sourceType: "script",
comments: false,
ignore: [
// These may not be strictly necessary with the newly-limited scope of
// babelrc searching, but including them for now because we had them
// in our .babelignore before.
"packages/*/test/fixtures",
ignoreLib ? "packages/*/lib" : null,
"packages/babel-standalone/babel.js",
]
.filter(Boolean)
.map(normalize),
presets: [
[
"@babel/preset-typescript",
{ onlyRemoveTypeImports: true, allowDeclareFields: true },
],
["@babel/env", envOpts],
["@babel/preset-flow", { allowDeclareFields: true }],
],
plugins: [
[
"@babel/proposal-object-rest-spread",
{ useBuiltIns: true, loose: true },
],
convertESM ? "@babel/proposal-export-namespace-from" : null,
convertESM ? "@babel/transform-modules-commonjs" : null,
process.env.STRIP_BABEL_8_FLAG && [
pluginToggleBabel8Breaking,
{ breaking: bool(process.env.BABEL_8_BREAKING) },
],
polyfillRequireResolve && pluginPolyfillRequireResolve,
].filter(Boolean),
overrides: [
{
test: [
"packages/babel-parser",
"packages/babel-helper-validator-identifier",
].map(normalize),
plugins: [
"babel-plugin-transform-charcodes",
["@babel/transform-for-of", { assumeArray: true }],
],
},
{
test: ["./packages/babel-cli", "./packages/babel-core"].map(normalize),
plugins: [
// Explicitly use the lazy version of CommonJS modules.
convertESM
? ["@babel/transform-modules-commonjs", { lazy: true }]
: null,
].filter(Boolean),
},
{
test: normalize("./packages/babel-polyfill"),
presets: [["@babel/env", envOptsNoTargets]],
},
{
test: unambiguousSources.map(normalize),
sourceType: "unambiguous",
},
includeRegeneratorRuntime && {
exclude: /regenerator-runtime/,
plugins: [["@babel/transform-runtime", transformRuntimeOptions]],
},
].filter(Boolean),
};
// we need to do this as long as we do not test everything from source
if (includeCoverage) {
config.auxiliaryCommentBefore = "istanbul ignore next";
config.plugins.push("babel-plugin-istanbul");
}
return config;
};
// env vars from the cli are always strings, so !!ENV_VAR returns true for "false"
function bool(value) {
return value && value === "false" && value === "0";
}
// TODO(Babel 8) This polyfill is only needed for Node.js 6 and 8
function pluginPolyfillRequireResolve({ template, types: t }) {
return {
visitor: {
MemberExpression(path) {
if (!path.matchesPattern("require.resolve")) return;
if (!t.isCallExpression(path.parent, { callee: path.node })) return;
const args = path.parent.arguments;
if (args.length < 2) return;
if (
!t.isObjectExpression(args[1]) ||
args[1].properties.length !== 1 ||
!t.isIdentifier(args[1].properties[0].key, { name: "paths" }) ||
!t.isArrayExpression(args[1].properties[0].value) ||
args[1].properties[0].value.elements.length !== 1
) {
throw path.parentPath.buildCodeFrameError(
"This 'require.resolve' usage is not supported by the inline polyfill."
);
}
// require.resolve's paths option has been introduced in Node.js 8.9
// https://nodejs.org/api/modules.html#modules_require_resolve_request_options
path.replaceWith(template.ast`
parseFloat(process.versions.node) >= 8.9
? require.resolve
: (/* request */ r, { paths: [/* base */ b] }, M = require("module")) => {
let /* filename */ f = M._findPath(r, M._nodeModulePaths(b).concat(b));
if (f) return f;
f = new Error(\`Cannot resolve module '\${r}'\`);
f.code = "MODULE_NOT_FOUND";
throw f;
}
`);
},
},
};
}
function pluginToggleBabel8Breaking({ types: t }, { breaking }) {
return {
visitor: {
"IfStatement|ConditionalExpression"(path) {
let test = path.get("test");
let keepConsequent = breaking;
if (test.isUnaryExpression({ operator: "!" })) {
test = test.get("argument");
keepConsequent = !keepConsequent;
}
if (!test.matchesPattern("process.env.BABEL_8_BREAKING")) return;
path.replaceWith(
keepConsequent
? path.node.consequent
: path.node.alternate || t.emptyStatement()
);
},
MemberExpression(path) {
if (path.matchesPattern("process.env.BABEL_8_BREAKING")) {
throw path.buildCodeFrameError("This check could not be stripped.");
}
},
},
};
}