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index.js
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index.js
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'use strict';
const
deepmerge = require('deepmerge'),
fs = require('fs'),
path = require('path'),
defaultOptions = {
configDirName: '',
configFileName: 'config',
configNameSeparator: '-',
loaders: [require('./jsLoader'), require('./jsonLoader')],
merge: (x, y) => deepmerge(x, y),
transform: _ => _
};
function flavors(configName, options) {
const configNameSeparator = options.configNameSeparator || defaultOptions.configNameSeparator;
const configDirName = options.configDirName || defaultOptions.configDirName;
const configFileName = options.configFileName || defaultOptions.configFileName;
const workingDir = options.workingDir || process.cwd();
const loaders = options.loaders || defaultOptions.loaders;
const transform = typeof options.transform === 'function' ? options.transform : defaultOptions.transform;
const merge = typeof options.merge === 'function' ? options.merge : defaultOptions.merge;
const postload = [];
function getConfigNameParts(configName) {
return configName.split(configNameSeparator);
}
const
originalConfigName = configName,
originalConfigNameParts = getConfigNameParts(configName),
originalConfigDir = resolveConfigDir(originalConfigNameParts);
function resolveConfigDir(nameParts) {
return path.resolve(workingDir, ...nameParts.map(i => path.join(configDirName, i)));
}
function load(config) {
const parentConfigs =
(config.extends === undefined
? (config.nameParts.length > 0
? [config.nameParts.slice(0, config.nameParts.length - 1)]
: [])
: (Array.isArray(config.extends) ? config.extends : [config.extends])).map(resolve);
const loadedParentConfig = parentConfigs.map(load).reduce(merge, {});
const info = {
config: {
dir: originalConfigDir,
name: originalConfigName,
nameParts: originalConfigNameParts
},
currentConfig: {
dir: config.dir,
name: config.name,
nameParts: config.nameParts
},
options
};
if (config.file) {
info.currentConfig.file = config.file;
}
info.parentConfigs = parentConfigs.map(i => {
const c = {
dir: i.dir,
name: i.name,
nameParts: i.nameParts
};
if (i.file) {
c.file = i.file;
}
return c;
});
if (parentConfigs.length === 1) {
info.parentConfig = info.parentConfigs[0];
}
if (config.postload !== undefined) {
postload.push({config, info});
}
const loadedConfig = config.load(loadedParentConfig, info);
if (typeof loadedConfig !== 'object' || Array.isArray(loadedConfig)) {
throw new Error(`${config.file} must return object.`);
}
return transform(config.merge ? merge(loadedParentConfig, loadedConfig, info) : loadedConfig, info);
}
function resolve(configName) {
let config = {};
if (typeof configName === 'string') {
config.name = configName;
config.nameParts = getConfigNameParts(configName);
} else {
config.nameParts = configName;
config.name = config.nameParts.join(configNameSeparator);
}
config.dir = resolveConfigDir(config.nameParts);
function resolveConfigItemPath(...parts) {
return path.resolve(config.dir, ...parts);
}
function resolveConfigFile(extension) {
return resolveConfigItemPath(configDirName, configFileName + extension);
}
let configFile;
for (let loader of loaders) {
configFile = resolveConfigFile(loader.extension);
if (fs.existsSync(configFile)) {
config.file = configFile;
config = Object.assign(loader.loader(configFile), config);
break;
}
}
if (config.load === undefined) {
config.load = () => ({});
}
if (config.merge === undefined) {
config.merge = true;
}
return config;
}
const config = load(resolve(configName));
return (options.reversePostload ? postload.reverse() : postload).reduce((current, next) => merge(current, next.config.postload(current, next.info) || {}), config);
}
flavors.defaultOptions = defaultOptions;
module.exports = flavors;