electron/lib/common/api/deprecate.js

// Deprecate a method.
const deprecate = function (oldName, newName, fn) {
  let warned = false
  return function () {
    if (!(warned || process.noDeprecation)) {
      warned = true
      deprecate.warn(oldName, newName)
    }
    return fn.apply(this, arguments)
  }
}

// The method is renamed.
deprecate.rename = (object, oldName, newName) => {
  console.log('we are here')
  let warned = false
  const newMethod = function () {
    if (!(warned || process.noDeprecation)) {
      warned = true
      deprecate.warn(oldName, newName)
    }
    return this[newName].apply(this, arguments)
  }
  if (typeof object === 'function') {
    object.prototype[oldName] = newMethod
  } else {
    object[oldName] = newMethod
  }
}

// Forward the method to member.
deprecate.member = (object, method, member) => {
  let warned = false
  object.prototype[method] = function () {
    if (!(warned || process.noDeprecation)) {
      warned = true
      deprecate.warn(method, `${member}.${method}`)
    }
    return this[member][method].apply(this[member], arguments)
  }
}

// Deprecate a property.
deprecate.property = (object, property, method) => {
  return Object.defineProperty(object, property, {
    get: function () {
      let warned = false
      if (!(warned || process.noDeprecation)) {
        warned = true
        deprecate.warn(`${property} property`, `${method} method`)
      }
      return this[method]()
    }
  })
}

// Deprecate an event.
deprecate.event = (emitter, oldName, newName, fn) => {
  let warned = false
  return emitter.on(newName, function (...args) {
    if (this.listenerCount(oldName) > 0) {
      if (!(warned || process.noDeprecation)) {
        warned = true
        deprecate.warn(`'${oldName}' event`, `'${newName}' event`)
      }
      if (fn != null) {
        fn.apply(this, arguments)
      } else {
        this.emit.apply(this, [oldName].concat(args))
      }
    }
  })
}

deprecate.warn = (oldName, newName) => {
  return deprecate.log(`'${oldName}' is deprecated. Use '${newName}' instead.`)
}

let deprecationHandler = null

// Print deprecation message.
deprecate.log = (message) => {
  if (typeof deprecationHandler === 'function') {
    deprecationHandler(message)
  } else if (process.throwDeprecation) {
    throw new Error(message)
  } else if (process.traceDeprecation) {
    return console.trace(message)
  } else {
    return console.warn(`(electron) ${message}`)
  }
}

deprecate.setHandler = (handler) => {
  deprecationHandler = handler
}

deprecate.getHandler = () => deprecationHandler

module.exports = deprecate