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copilot/legacy/spikes/graphql/apollo-redux/scripts/customized-config.js

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