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73 lines
2.6 KiB
JavaScript
73 lines
2.6 KiB
JavaScript
/*
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This module runs the scripts from react-scripts (Create React App)
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and gives an opportunity to override the Webpack config by creating
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a "config-overrides.dev.js" or "config-overrides.prod.js" file in the
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root of the project.
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The config-override file should export a single function that takes a
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config and returns the modified config, like this:
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module.exports = function(webpackConfig) {
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return webpackConfig;
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};
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*/
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var rewire = require('rewire');
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var proxyquire = require('proxyquire');
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switch(process.argv[2]) {
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// The "start" script is run during development mode
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case 'start':
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rewireModule('react-scripts/scripts/start.js', loadCustomizer('./config-overrides.dev'));
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break;
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// The "build" script is run to produce a production bundle
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case 'build':
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rewireModule('react-scripts/scripts/build.js', loadCustomizer('./config-overrides.prod'));
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break;
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// The "test" script runs all the tests with Jest
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case 'test':
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// Load customizations from the config-overrides.testing file.
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// That file should export a single function that takes a config and returns a config
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let customizer = loadCustomizer('./config-overrides.testing');
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proxyquire('react-scripts/scripts/test.js', {
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// When test.js asks for '../utils/createJestConfig' it will get this instead:
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'../utils/createJestConfig': (...args) => {
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// Use the existing createJestConfig function to create a config, then pass
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// it through the customizer
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var createJestConfig = require('react-scripts/utils/createJestConfig');
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return customizer(createJestConfig(...args));
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}
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});
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break;
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default:
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console.log('customized-config only supports "start", "build", and "test" options.');
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process.exit(-1);
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}
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// Attempt to load the given module and return null if it fails.
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function loadCustomizer(module) {
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try {
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return require(module);
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} catch(e) {
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if(e.code !== "MODULE_NOT_FOUND") {
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throw e;
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}
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}
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// If the module doesn't exist, return a
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// noop that simply returns the config it's given.
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return config => config;
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}
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function rewireModule(modulePath, customizer) {
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// Load the module with `rewire`, which allows modifying the
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// script's internal variables.
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let defaults = rewire(modulePath);
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// Reach into the module, grab its global 'config' variable,
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// pass it through the customizer function, and then set it back.
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// 'config' is Create React App's built-in Webpack config.
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let config = defaults.__get__('config');
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config = customizer(Object.assign({}, config));
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defaults.__set__('config', config);
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}
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