react-native-builder-bob/lib/src/configs/babel-config.cjs

CLI to build JavaScript files for React Native libraries

"use strict";
/* eslint-disable import-x/no-commonjs, no-undef */
const path = require('path');
const { loadConfig } = require('../utils/loadConfig.js');
/**
 * Get Babel configuration for the example project.
 * This sets up appropriate presets and plugins for the library.
 * It also aliases the library to the source directory.
 *
 * @param {import('@babel/core').TransformOptions} defaultConfig Default Babel configuration
 * @param {object} options Options to customize the configuration
 * @param {string} options.root Root directory of the monorepo
 * @param {object} options.pkg Content of package.json of the library
 * @returns {import('@babel/core').TransformOptions} Babel configuration
 */
const getConfig = (defaultConfig, { root }) => {
    const result = loadConfig(root);
    if (result == null) {
        throw new Error(`Couldn't find a valid configuration at ${root}.`);
    }
    const { source } = result.config;
    if (source == null) {
        throw new Error("Couldn't determine the source directory. Does your config specify a 'source' field?");
    }
    return {
        ...defaultConfig,
        overrides: [
            ...(defaultConfig.overrides == null ? [] : defaultConfig.overrides),
            {
                include: path.join(root, source),
                presets: [
                    [
                        require.resolve('./babel-preset.cjs'),
                        {
                            // Let the app's preset handle the commonjs transform
                            // Otherwise this causes `export` statements in wrong places causing syntax error
                            supportsStaticESM: true,
                        },
                    ],
                ],
            },
        ],
    };
};
exports.getConfig = getConfig;
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