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node_modules/yargs/lib/apply-extends.js 1.44 KB
ce4c83ff   wxy   初始提交
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  var fs = require('fs')
  var path = require('path')
  var assign = require('./assign')
  var YError = require('./yerror')
  
  var previouslyVisitedConfigs = []
  
  function checkForCircularExtends (path) {
    if (previouslyVisitedConfigs.indexOf(path) > -1) {
      throw new YError("Circular extended configurations: '" + path + "'.")
    }
  }
  
  function getPathToDefaultConfig (cwd, pathToExtend) {
    return path.resolve(cwd, pathToExtend)
  }
  
  function applyExtends (config, cwd) {
    var defaultConfig = {}
  
    if (config.hasOwnProperty('extends')) {
      if (typeof config.extends !== 'string') return defaultConfig
      var isPath = /\.json$/.test(config.extends)
      var pathToDefault = null
      if (!isPath) {
        try {
          pathToDefault = require.resolve(config.extends)
        } catch (err) {
          // most likely this simply isn't a module.
        }
      } else {
        pathToDefault = getPathToDefaultConfig(cwd, config.extends)
      }
      // maybe the module uses key for some other reason,
      // err on side of caution.
      if (!pathToDefault && !isPath) return config
  
      checkForCircularExtends(pathToDefault)
  
      previouslyVisitedConfigs.push(pathToDefault)
  
      defaultConfig = isPath ? JSON.parse(fs.readFileSync(pathToDefault, 'utf8')) : require(config.extends)
      delete config.extends
      defaultConfig = applyExtends(defaultConfig, path.dirname(pathToDefault))
    }
  
    previouslyVisitedConfigs = []
  
    return assign(defaultConfig, config)
  }
  
  module.exports = applyExtends