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ConfigGroup.js
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ConfigGroup.js
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const { existsSync } = require('fs');
const { resolve, sep, dirname, extname } = require('path');
const webpackMerge = require('webpack-merge');
const { extensions, jsVariants } = require('interpret');
const GroupHelper = require('../utils/GroupHelper');
const rechoir = require('rechoir');
const ConfigError = require('../utils/errors/ConfigError');
const logger = require('../utils/logger');
// Order defines the priority, in increasing order
// example - config file lookup will be in order of .webpack/webpack.config.development.js -> webpack.config.development.js -> webpack.config.js
const DEFAULT_CONFIG_LOC = [
'webpack.config',
'webpack.config.dev',
'webpack.config.development',
'webpack.config.prod',
'webpack.config.production',
'.webpack/webpack.config',
'.webpack/webpack.config.none',
'.webpack/webpack.config.dev',
'.webpack/webpack.config.development',
'.webpack/webpack.config.prod',
'.webpack/webpack.config.production',
'.webpack/webpackfile',
];
const modeAlias = {
production: 'prod',
development: 'dev',
};
const getDefaultConfigFiles = () => {
return DEFAULT_CONFIG_LOC.map((filename) => {
// Since .cjs is not available on interpret side add it manually to default config
return [...Object.keys(extensions), '.cjs'].map((ext) => {
return {
path: resolve(filename + ext),
ext: ext,
module: extensions[ext],
};
});
}).reduce((a, i) => a.concat(i), []);
};
const getConfigInfoFromFileName = (filename) => {
const ext = extname(filename);
// since we support only one config for now
const allFiles = [filename];
// return all the file metadata
return allFiles
.map((file) => {
return {
path: resolve(file),
ext: ext,
module: extensions[ext] || null,
};
})
.filter((e) => existsSync(e.path));
};
class ConfigGroup extends GroupHelper {
constructor(options) {
super(options);
}
requireLoader(extension, path) {
rechoir.prepare(extensions, path, process.cwd());
}
requireConfig(configModule) {
const extension = Object.keys(jsVariants).find((t) => configModule.ext.endsWith(t));
if (extension) {
this.requireLoader(extension, configModule.path);
}
let config = require(configModule.path);
if (config.default) {
config = config.default;
}
return {
content: config,
path: configModule.path,
};
}
async finalize(moduleObj) {
const { argv } = this.args;
const newOptionsObject = {
outputOptions: {},
options: {},
};
if (!moduleObj) {
return newOptionsObject;
}
const configPath = moduleObj.path;
const configOptions = moduleObj.content;
if (typeof configOptions === 'function') {
// when config is a function, pass the env from args to the config function
let formattedEnv;
if (Array.isArray(this.args.env)) {
formattedEnv = this.args.env.reduce((envObject, envOption) => {
envObject[envOption] = true;
return envObject;
}, {});
}
const newOptions = configOptions(formattedEnv, argv);
// When config function returns a promise, resolve it, if not it's resolved by default
newOptionsObject['options'] = await Promise.resolve(newOptions);
} else if (Array.isArray(configOptions) && this.args.configName) {
// In case of exporting multiple configurations, If you pass a name to --config-name flag,
// webpack will only build that specific configuration.
const namedOptions = configOptions.filter((opt) => this.args.configName.includes(opt.name));
if (namedOptions.length === 0) {
logger.error(`Configuration with name "${this.args.configName}" was not found.`);
process.exit(2);
} else {
newOptionsObject['options'] = namedOptions;
}
} else {
if (Array.isArray(configOptions) && !configOptions.length) {
newOptionsObject['options'] = {};
return newOptionsObject;
}
newOptionsObject['options'] = configOptions;
}
if (configOptions && configPath.includes('.webpack')) {
const currentPath = configPath;
const parentContext = dirname(currentPath).split(sep).slice(0, -1).join(sep);
if (Array.isArray(configOptions)) {
configOptions.forEach((config) => {
config.context = config.context || parentContext;
});
} else {
configOptions.context = configOptions.context || parentContext;
}
newOptionsObject['options'] = configOptions;
}
return newOptionsObject;
}
async resolveConfigFiles() {
const { config, mode } = this.args;
if (config.length > 0) {
const resolvedOptions = [];
const finalizedConfigs = config.map(async (webpackConfig) => {
const configPath = resolve(webpackConfig);
const configFiles = getConfigInfoFromFileName(configPath);
if (!configFiles.length) {
throw new ConfigError(`The specified config file doesn't exist in ${configPath}`);
}
const foundConfig = configFiles[0];
const resolvedConfig = this.requireConfig(foundConfig);
return this.finalize(resolvedConfig);
});
// resolve all the configs
for await (const resolvedOption of finalizedConfigs) {
if (Array.isArray(resolvedOption.options)) {
resolvedOptions.push(...resolvedOption.options);
} else {
resolvedOptions.push(resolvedOption.options);
}
}
// When the resolved configs are more than 1, then pass them as Array [{...}, {...}] else pass the first config object {...}
const finalOptions = resolvedOptions.length > 1 ? resolvedOptions : resolvedOptions[0] || {};
this.opts['options'] = finalOptions;
return;
}
// When no config is supplied, lookup for default configs
const defaultConfigFiles = getDefaultConfigFiles();
const tmpConfigFiles = defaultConfigFiles.filter((file) => {
return existsSync(file.path);
});
const configFiles = tmpConfigFiles.map(this.requireConfig.bind(this));
if (configFiles.length) {
const defaultConfig = configFiles.find((p) => p.path.includes(mode) || p.path.includes(modeAlias[mode]));
if (defaultConfig) {
this.opts = await this.finalize(defaultConfig);
return;
}
const foundConfig = configFiles.pop();
this.opts = await this.finalize(foundConfig);
return;
}
}
async resolveConfigMerging() {
const { merge } = this.args;
if (merge) {
// Get the current configuration options
const { options: configOptions } = this.opts;
// we can only merge when there are multiple configurations
// either by passing multiple configs by flags or passing a
// single config exporting an array
if (!Array.isArray(configOptions)) {
throw new ConfigError('Atleast two configurations are required for merge.', 'MergeError');
}
// We return a single config object which is passed to the compiler
const mergedOptions = configOptions.reduce((currentConfig, mergedConfig) => webpackMerge(currentConfig, mergedConfig), {});
this.opts['options'] = mergedOptions;
}
}
async run() {
await this.resolveConfigFiles();
await this.resolveConfigMerging();
return this.opts;
}
}
module.exports = ConfigGroup;