@expo/metro-config
Version:
A Metro config for running React Native projects with the Metro bundler
45 lines • 1.99 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.loadBabelConfig = void 0;
/**
* Copyright (c) 650 Industries (Expo). All rights reserved.
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
const node_fs_1 = __importDefault(require("node:fs"));
const node_path_1 = __importDefault(require("node:path"));
/**
* Returns a memoized function that checks for the existence of a
* project-level .babelrc file. If it doesn't exist, it reads the
* default React Native babelrc file and uses that.
*/
exports.loadBabelConfig = (function () {
let babelRC = null;
return function _getBabelRC({ projectRoot }) {
if (babelRC !== null) {
return babelRC;
}
babelRC = {};
if (projectRoot) {
// Check for various babel config files in the project root
// TODO(EvanBacon): We might want to disable babelrc lookup when the user specifies `enableBabelRCLookup: false`.
const possibleBabelRCPaths = ['.babelrc', '.babelrc.js', 'babel.config.js'];
const foundBabelRCPath = possibleBabelRCPaths.find((configFileName) => node_fs_1.default.existsSync(node_path_1.default.resolve(projectRoot, configFileName)));
// Extend the config if a babel config file is found
if (foundBabelRCPath) {
babelRC.extends = node_path_1.default.resolve(projectRoot, foundBabelRCPath);
}
}
// Use the default preset for react-native if no babel config file is found
if (!babelRC.extends) {
babelRC.presets = [require('babel-preset-expo')];
}
return babelRC;
};
})();
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