/
index.js
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/
index.js
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/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow
* @format
*/
'use strict';
const TerminalReporter = require('metro/src/lib/TerminalReporter');
const exclusionList = require('./exclusionList');
const getMaxWorkers = require('metro/src/lib/getMaxWorkers');
const os = require('os');
const path = require('path');
const {
assetExts,
assetResolutions,
sourceExts,
platforms,
DEFAULT_METRO_MINIFIER_PATH,
defaultCreateModuleIdFactory,
} = require('./defaults');
const {FileStore} = require('metro-cache');
const {Terminal} = require('metro-core');
import type {ConfigT} from '../configTypes.flow';
const getDefaultValues = (projectRoot: ?string): ConfigT => ({
resolver: {
assetExts,
assetResolutions,
platforms,
sourceExts,
blockList: exclusionList(),
dependencyExtractor: undefined,
extraNodeModules: {},
hasteImplModulePath: undefined,
nodeModulesPaths: [],
resolveRequest: null,
resolverMainFields: ['browser', 'main'],
useWatchman: true,
},
serializer: {
polyfillModuleNames: [],
getRunModuleStatement: (moduleId: number | string) =>
`__r(${JSON.stringify(moduleId)});`,
getPolyfills: () => [],
postProcessBundleSourcemap: ({code, map, outFileName}) => ({code, map}),
getModulesRunBeforeMainModule: () => [],
processModuleFilter: module => true,
createModuleIdFactory: defaultCreateModuleIdFactory,
experimentalSerializerHook: () => {},
customSerializer: null,
},
server: {
useGlobalHotkey: true,
port: 8080,
enhanceMiddleware: middleware => middleware,
rewriteRequestUrl: url => url,
runInspectorProxy: true,
verifyConnections: false,
},
symbolicator: {
customizeFrame: () => {},
},
transformer: {
assetPlugins: [],
asyncRequireModulePath: 'metro-runtime/src/modules/asyncRequire',
assetRegistryPath: 'missing-asset-registry-path',
babelTransformerPath: 'metro-babel-transformer',
dynamicDepsInPackages: 'throwAtRuntime',
enableBabelRCLookup: true,
enableBabelRuntime: true,
experimentalImportBundleSupport: false,
getTransformOptions: async () => ({
transform: {
experimentalImportSupport: false,
inlineRequires: false,
unstable_disableES6Transforms: false,
},
preloadedModules: false,
ramGroups: [],
}),
globalPrefix: '',
hermesParser: false,
minifierConfig: {
mangle: {
toplevel: false,
},
output: {
ascii_only: true,
quote_style: 3,
wrap_iife: true,
},
sourceMap: {
includeSources: false,
},
toplevel: false,
compress: {
// reduce_funcs inlines single-use functions, which cause perf regressions.
reduce_funcs: false,
},
},
minifierPath: DEFAULT_METRO_MINIFIER_PATH,
optimizationSizeLimit: 150 * 1024, // 150 KiB.
transformVariants: {default: {}},
workerPath: 'metro/src/DeltaBundler/Worker',
publicPath: '/assets',
allowOptionalDependencies: false,
unstable_collectDependenciesPath:
'metro/src/ModuleGraph/worker/collectDependencies.js',
unstable_dependencyMapReservedName: null,
unstable_disableModuleWrapping: false,
unstable_disableNormalizePseudoGlobals: false,
unstable_compactOutput: false,
},
cacheStores: [
new FileStore({
root: path.join(os.tmpdir(), 'metro-cache'),
}),
],
cacheVersion: '1.0',
// We assume the default project path is two levels up from
// node_modules/metro/
projectRoot: projectRoot || path.resolve(__dirname, '../../..'),
stickyWorkers: true,
watchFolders: [],
transformerPath: require.resolve('metro-transform-worker'),
maxWorkers: getMaxWorkers(),
resetCache: false,
reporter: new TerminalReporter(new Terminal(process.stdout)),
});
async function getDefaultConfig(rootPath: ?string): Promise<ConfigT> {
// We can add more logic here to get a sensible default configuration, for
// now we just return a stub.
return getDefaultValues(rootPath);
}
module.exports = getDefaultConfig;
module.exports.getDefaultValues = getDefaultValues;