mirror of
https://github.com/zhigang1992/react-native.git
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89b3cc1f2f
Summary: Gets rid of `Config.get` in favor of three methods with names that express intend. The logic for applying defaults was used from one callsite only, and was moved there. This is the starting point to make the config loading system a better place, including a strong return type and defaults always applied. Reviewed By: martinbigio Differential Revision: D4985774 fbshipit-source-id: 98300547c3eafd5948814d57ce93e71d43572eb8
85 lines
2.4 KiB
JavaScript
85 lines
2.4 KiB
JavaScript
/**
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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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*/
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'use strict';
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const fs = require('fs');
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const invariant = require('fbjs/lib/invariant');
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const path = require('path');
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const RN_CLI_CONFIG = 'rn-cli.config.js';
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// TODO: @bestander & @grabbou - get rid when internal tests are fixed
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import type {ConfigT} from '../core';
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export type {ConfigT};
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/**
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* Module capable of getting the configuration out of a given file.
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*
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* The function will return all the default configuration, as specified by the
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* `defaultConfig` param overriden by those found on `rn-cli.config.js` files, if any. If no
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* default config is provided and no configuration can be found in the directory
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* hierarchy, an error will be thrown.
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*/
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const Config = {
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find(startDir: string) {
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const configPath = findConfigPath(startDir);
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invariant(
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configPath,
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`Can't find "${RN_CLI_CONFIG}" file in any parent folder of "${startDir}"`,
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);
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return this.loadFile(configPath, startDir);
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},
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findOptional(startDir: string) {
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const configPath = findConfigPath(startDir);
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return configPath
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? this.loadFile(configPath, startDir)
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: {cwd: startDir};
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},
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loadFile(
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pathToConfig: string,
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cwd: string,
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) {
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const config = path.isAbsolute(pathToConfig) ?
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// $FlowFixMe nope
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require(pathToConfig) :
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// $FlowFixMe nope
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require(path.join(cwd, pathToConfig));
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return {...config, cwd};
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},
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};
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function findConfigPath(cwd: string): ?string {
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const parentDir = findParentDirectory(cwd, RN_CLI_CONFIG);
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return parentDir ? path.join(parentDir, RN_CLI_CONFIG) : null;
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}
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// Finds the most near ancestor starting at `currentFullPath` that has
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// a file named `filename`
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function findParentDirectory(currentFullPath, filename) {
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const root = path.parse(currentFullPath).root;
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const testDir = (parts) => {
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if (parts.length === 0) {
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return null;
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}
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const fullPath = path.join(root, parts.join(path.sep));
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var exists = fs.existsSync(path.join(fullPath, filename));
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return exists ? fullPath : testDir(parts.slice(0, -1));
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};
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return testDir(currentFullPath.substring(root.length).split(path.sep));
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}
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module.exports = Config;
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