77 lines
1.7 KiB
Text
77 lines
1.7 KiB
Text
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/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @flow
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* @format
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*/
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'use strict';
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const fs = require('fs-extra');
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const path = require('path');
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import type {ConfigT} from './Config';
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const METRO_CONFIG_FILENAME = 'metro.config.js';
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exports.watchFile = async function(
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filename: string,
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callback: () => *,
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): Promise<void> {
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fs.watchFile(filename, () => {
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callback();
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});
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await callback();
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};
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exports.findMetroConfig = async function(filename: ?string): Promise<?string> {
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if (filename) {
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return path.resolve(process.cwd(), filename);
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} else {
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let previous;
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let current = process.cwd();
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do {
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const filename = path.join(current, METRO_CONFIG_FILENAME);
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if (fs.existsSync(filename)) {
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return filename;
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}
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previous = current;
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current = path.dirname(current);
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} while (previous !== current);
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return null;
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}
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};
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exports.fetchMetroConfig = async function(
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filename: ?string,
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): Promise<$Shape<ConfigT>> {
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const location = await exports.findMetroConfig(filename);
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if (location) {
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// $FlowFixMe: We want this require to be dynamic
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return require(location);
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} else {
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return {};
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}
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};
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// eslint-disable-next-line no-unclear-flowtypes
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exports.makeAsyncCommand = (command: (argv: any) => Promise<*>) => (
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// eslint-disable-next-line no-unclear-flowtypes
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argv: any,
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) => {
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Promise.resolve(command(argv)).catch(error => {
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console.error(error.stack);
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process.exitCode = 1;
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});
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};
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