packages/babel-helpers/src/helpers.js
// @flow
import template from "@babel/template";
const helpers = Object.create(null);
export default helpers;
const helper = (minVersion: string) => tpl => ({
minVersion,
ast: () => template.program.ast(tpl),
});
helpers.typeof = helper("7.0.0-beta.0")`
export default function _typeof(obj) {
"@babel/helpers - typeof";
if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
_typeof = function (obj) { return typeof obj; };
} else {
_typeof = function (obj) {
return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype
? "symbol"
: typeof obj;
};
}
return _typeof(obj);
}
`;
// "for" is a reserved keyword in ES3 so escaping it here for backward compatibility
helpers.jsx = helper("7.0.0-beta.0")`
var REACT_ELEMENT_TYPE;
export default function _createRawReactElement(type, props, key, children) {
if (!REACT_ELEMENT_TYPE) {
REACT_ELEMENT_TYPE = (
typeof Symbol === "function" && Symbol["for"] && Symbol["for"]("react.element")
) || 0xeac7;
}
var defaultProps = type && type.defaultProps;
var childrenLength = arguments.length - 3;
if (!props && childrenLength !== 0) {
// If we're going to assign props.children, we create a new object now
// to avoid mutating defaultProps.
props = {
children: void 0,
};
}
if (childrenLength === 1) {
props.children = children;
} else if (childrenLength > 1) {
var childArray = new Array(childrenLength);
for (var i = 0; i < childrenLength; i++) {
childArray[i] = arguments[i + 3];
}
props.children = childArray;
}
if (props && defaultProps) {
for (var propName in defaultProps) {
if (props[propName] === void 0) {
props[propName] = defaultProps[propName];
}
}
} else if (!props) {
props = defaultProps || {};
}
return {
$$typeof: REACT_ELEMENT_TYPE,
type: type,
key: key === undefined ? null : '' + key,
ref: null,
props: props,
_owner: null,
};
}
`;
helpers.asyncIterator = helper("7.0.0-beta.0")`
export default function _asyncIterator(iterable) {
var method
if (typeof Symbol !== "undefined") {
if (Symbol.asyncIterator) {
method = iterable[Symbol.asyncIterator]
if (method != null) return method.call(iterable);
}
if (Symbol.iterator) {
method = iterable[Symbol.iterator]
if (method != null) return method.call(iterable);
}
}
throw new TypeError("Object is not async iterable");
}
`;
helpers.AwaitValue = helper("7.0.0-beta.0")`
export default function _AwaitValue(value) {
this.wrapped = value;
}
`;
helpers.AsyncGenerator = helper("7.0.0-beta.0")`
import AwaitValue from "AwaitValue";
export default function AsyncGenerator(gen) {
var front, back;
function send(key, arg) {
return new Promise(function (resolve, reject) {
var request = {
key: key,
arg: arg,
resolve: resolve,
reject: reject,
next: null,
};
if (back) {
back = back.next = request;
} else {
front = back = request;
resume(key, arg);
}
});
}
function resume(key, arg) {
try {
var result = gen[key](arg)
var value = result.value;
var wrappedAwait = value instanceof AwaitValue;
Promise.resolve(wrappedAwait ? value.wrapped : value).then(
function (arg) {
if (wrappedAwait) {
resume(key === "return" ? "return" : "next", arg);
return
}
settle(result.done ? "return" : "normal", arg);
},
function (err) { resume("throw", err); });
} catch (err) {
settle("throw", err);
}
}
function settle(type, value) {
switch (type) {
case "return":
front.resolve({ value: value, done: true });
break;
case "throw":
front.reject(value);
break;
default:
front.resolve({ value: value, done: false });
break;
}
front = front.next;
if (front) {
resume(front.key, front.arg);
} else {
back = null;
}
}
this._invoke = send;
// Hide "return" method if generator return is not supported
if (typeof gen.return !== "function") {
this.return = undefined;
}
}
if (typeof Symbol === "function" && Symbol.asyncIterator) {
AsyncGenerator.prototype[Symbol.asyncIterator] = function () { return this; };
}
AsyncGenerator.prototype.next = function (arg) { return this._invoke("next", arg); };
AsyncGenerator.prototype.throw = function (arg) { return this._invoke("throw", arg); };
AsyncGenerator.prototype.return = function (arg) { return this._invoke("return", arg); };
`;
helpers.wrapAsyncGenerator = helper("7.0.0-beta.0")`
import AsyncGenerator from "AsyncGenerator";
export default function _wrapAsyncGenerator(fn) {
return function () {
return new AsyncGenerator(fn.apply(this, arguments));
};
}
`;
helpers.awaitAsyncGenerator = helper("7.0.0-beta.0")`
import AwaitValue from "AwaitValue";
export default function _awaitAsyncGenerator(value) {
return new AwaitValue(value);
}
`;
helpers.asyncGeneratorDelegate = helper("7.0.0-beta.0")`
export default function _asyncGeneratorDelegate(inner, awaitWrap) {
var iter = {}, waiting = false;
function pump(key, value) {
waiting = true;
value = new Promise(function (resolve) { resolve(inner[key](value)); });
return { done: false, value: awaitWrap(value) };
};
if (typeof Symbol === "function" && Symbol.iterator) {
iter[Symbol.iterator] = function () { return this; };
}
iter.next = function (value) {
if (waiting) {
waiting = false;
return value;
}
return pump("next", value);
};
if (typeof inner.throw === "function") {
iter.throw = function (value) {
if (waiting) {
waiting = false;
throw value;
}
return pump("throw", value);
};
}
if (typeof inner.return === "function") {
iter.return = function (value) {
if (waiting) {
waiting = false;
return value;
}
return pump("return", value);
};
}
return iter;
}
`;
helpers.asyncToGenerator = helper("7.0.0-beta.0")`
function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) {
try {
var info = gen[key](arg);
var value = info.value;
} catch (error) {
reject(error);
return;
}
if (info.done) {
resolve(value);
} else {
Promise.resolve(value).then(_next, _throw);
}
}
export default function _asyncToGenerator(fn) {
return function () {
var self = this, args = arguments;
return new Promise(function (resolve, reject) {
var gen = fn.apply(self, args);
function _next(value) {
asyncGeneratorStep(gen, resolve, reject, _next, _throw, "next", value);
}
function _throw(err) {
asyncGeneratorStep(gen, resolve, reject, _next, _throw, "throw", err);
}
_next(undefined);
});
};
}
`;
helpers.classCallCheck = helper("7.0.0-beta.0")`
export default function _classCallCheck(instance, Constructor) {
if (!(instance instanceof Constructor)) {
throw new TypeError("Cannot call a class as a function");
}
}
`;
helpers.createClass = helper("7.0.0-beta.0")`
function _defineProperties(target, props) {
for (var i = 0; i < props.length; i ++) {
var descriptor = props[i];
descriptor.enumerable = descriptor.enumerable || false;
descriptor.configurable = true;
if ("value" in descriptor) descriptor.writable = true;
Object.defineProperty(target, descriptor.key, descriptor);
}
}
export default function _createClass(Constructor, protoProps, staticProps) {
if (protoProps) _defineProperties(Constructor.prototype, protoProps);
if (staticProps) _defineProperties(Constructor, staticProps);
return Constructor;
}
`;
helpers.defineEnumerableProperties = helper("7.0.0-beta.0")`
export default function _defineEnumerableProperties(obj, descs) {
for (var key in descs) {
var desc = descs[key];
desc.configurable = desc.enumerable = true;
if ("value" in desc) desc.writable = true;
Object.defineProperty(obj, key, desc);
}
// Symbols are not enumerated over by for-in loops. If native
// Symbols are available, fetch all of the descs object's own
// symbol properties and define them on our target object too.
if (Object.getOwnPropertySymbols) {
var objectSymbols = Object.getOwnPropertySymbols(descs);
for (var i = 0; i < objectSymbols.length; i++) {
var sym = objectSymbols[i];
var desc = descs[sym];
desc.configurable = desc.enumerable = true;
if ("value" in desc) desc.writable = true;
Object.defineProperty(obj, sym, desc);
}
}
return obj;
}
`;
helpers.defaults = helper("7.0.0-beta.0")`
export default function _defaults(obj, defaults) {
var keys = Object.getOwnPropertyNames(defaults);
for (var i = 0; i < keys.length; i++) {
var key = keys[i];
var value = Object.getOwnPropertyDescriptor(defaults, key);
if (value && value.configurable && obj[key] === undefined) {
Object.defineProperty(obj, key, value);
}
}
return obj;
}
`;
helpers.defineProperty = helper("7.0.0-beta.0")`
export default function _defineProperty(obj, key, value) {
// Shortcircuit the slow defineProperty path when possible.
// We are trying to avoid issues where setters defined on the
// prototype cause side effects under the fast path of simple
// assignment. By checking for existence of the property with
// the in operator, we can optimize most of this overhead away.
if (key in obj) {
Object.defineProperty(obj, key, {
value: value,
enumerable: true,
configurable: true,
writable: true
});
} else {
obj[key] = value;
}
return obj;
}
`;
helpers.extends = helper("7.0.0-beta.0")`
export default function _extends() {
_extends = Object.assign || function (target) {
for (var i = 1; i < arguments.length; i++) {
var source = arguments[i];
for (var key in source) {
if (Object.prototype.hasOwnProperty.call(source, key)) {
target[key] = source[key];
}
}
}
return target;
};
return _extends.apply(this, arguments);
}
`;
// This old helper can be removed in babel v8
helpers.objectSpread = helper("7.0.0-beta.0")`
import defineProperty from "defineProperty";
export default function _objectSpread(target) {
for (var i = 1; i < arguments.length; i++) {
var source = (arguments[i] != null) ? Object(arguments[i]) : {};
var ownKeys = Object.keys(source);
if (typeof Object.getOwnPropertySymbols === 'function') {
ownKeys = ownKeys.concat(Object.getOwnPropertySymbols(source).filter(function(sym) {
return Object.getOwnPropertyDescriptor(source, sym).enumerable;
}));
}
ownKeys.forEach(function(key) {
defineProperty(target, key, source[key]);
});
}
return target;
}
`;
helpers.objectSpread2 = helper("7.5.0")`
import defineProperty from "defineProperty";
// This function is different to "Reflect.ownKeys". The enumerableOnly
// filters on symbol properties only. Returned string properties are always
// enumerable. It is good to use in objectSpread.
function ownKeys(object, enumerableOnly) {
var keys = Object.keys(object);
if (Object.getOwnPropertySymbols) {
var symbols = Object.getOwnPropertySymbols(object);
if (enumerableOnly) symbols = symbols.filter(function (sym) {
return Object.getOwnPropertyDescriptor(object, sym).enumerable;
});
keys.push.apply(keys, symbols);
}
return keys;
}
export default function _objectSpread2(target) {
for (var i = 1; i < arguments.length; i++) {
var source = (arguments[i] != null) ? arguments[i] : {};
if (i % 2) {
ownKeys(Object(source), true).forEach(function (key) {
defineProperty(target, key, source[key]);
});
} else if (Object.getOwnPropertyDescriptors) {
Object.defineProperties(target, Object.getOwnPropertyDescriptors(source));
} else {
ownKeys(Object(source)).forEach(function (key) {
Object.defineProperty(
target,
key,
Object.getOwnPropertyDescriptor(source, key)
);
});
}
}
return target;
}
`;
helpers.inherits = helper("7.0.0-beta.0")`
import setPrototypeOf from "setPrototypeOf";
export default function _inherits(subClass, superClass) {
if (typeof superClass !== "function" && superClass !== null) {
throw new TypeError("Super expression must either be null or a function");
}
subClass.prototype = Object.create(superClass && superClass.prototype, {
constructor: {
value: subClass,
writable: true,
configurable: true
}
});
if (superClass) setPrototypeOf(subClass, superClass);
}
`;
helpers.inheritsLoose = helper("7.0.0-beta.0")`
export default function _inheritsLoose(subClass, superClass) {
subClass.prototype = Object.create(superClass.prototype);
subClass.prototype.constructor = subClass;
subClass.__proto__ = superClass;
}
`;
helpers.getPrototypeOf = helper("7.0.0-beta.0")`
export default function _getPrototypeOf(o) {
_getPrototypeOf = Object.setPrototypeOf
? Object.getPrototypeOf
: function _getPrototypeOf(o) {
return o.__proto__ || Object.getPrototypeOf(o);
};
return _getPrototypeOf(o);
}
`;
helpers.setPrototypeOf = helper("7.0.0-beta.0")`
export default function _setPrototypeOf(o, p) {
_setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) {
o.__proto__ = p;
return o;
};
return _setPrototypeOf(o, p);
}
`;
helpers.isNativeReflectConstruct = helper("7.9.0")`
export default function _isNativeReflectConstruct() {
if (typeof Reflect === "undefined" || !Reflect.construct) return false;
// core-js@3
if (Reflect.construct.sham) return false;
// Proxy can't be polyfilled. Every browser implemented
// proxies before or at the same time as Reflect.construct,
// so if they support Proxy they also support Reflect.construct.
if (typeof Proxy === "function") return true;
// Since Reflect.construct can't be properly polyfilled, some
// implementations (e.g. core-js@2) don't set the correct internal slots.
// Those polyfills don't allow us to subclass built-ins, so we need to
// use our fallback implementation.
try {
// If the internal slots aren't set, this throws an error similar to
// TypeError: this is not a Date object.
Date.prototype.toString.call(Reflect.construct(Date, [], function() {}));
return true;
} catch (e) {
return false;
}
}
`;
helpers.construct = helper("7.0.0-beta.0")`
import setPrototypeOf from "setPrototypeOf";
import isNativeReflectConstruct from "isNativeReflectConstruct";
export default function _construct(Parent, args, Class) {
if (isNativeReflectConstruct()) {
_construct = Reflect.construct;
} else {
// NOTE: If Parent !== Class, the correct __proto__ is set *after*
// calling the constructor.
_construct = function _construct(Parent, args, Class) {
var a = [null];
a.push.apply(a, args);
var Constructor = Function.bind.apply(Parent, a);
var instance = new Constructor();
if (Class) setPrototypeOf(instance, Class.prototype);
return instance;
};
}
// Avoid issues with Class being present but undefined when it wasn't
// present in the original call.
return _construct.apply(null, arguments);
}
`;
helpers.isNativeFunction = helper("7.0.0-beta.0")`
export default function _isNativeFunction(fn) {
// Note: This function returns "true" for core-js functions.
return Function.toString.call(fn).indexOf("[native code]") !== -1;
}
`;
// Based on https://github.com/WebReflection/babel-plugin-transform-builtin-classes
helpers.wrapNativeSuper = helper("7.0.0-beta.0")`
import getPrototypeOf from "getPrototypeOf";
import setPrototypeOf from "setPrototypeOf";
import isNativeFunction from "isNativeFunction";
import construct from "construct";
export default function _wrapNativeSuper(Class) {
var _cache = typeof Map === "function" ? new Map() : undefined;
_wrapNativeSuper = function _wrapNativeSuper(Class) {
if (Class === null || !isNativeFunction(Class)) return Class;
if (typeof Class !== "function") {
throw new TypeError("Super expression must either be null or a function");
}
if (typeof _cache !== "undefined") {
if (_cache.has(Class)) return _cache.get(Class);
_cache.set(Class, Wrapper);
}
function Wrapper() {
return construct(Class, arguments, getPrototypeOf(this).constructor)
}
Wrapper.prototype = Object.create(Class.prototype, {
constructor: {
value: Wrapper,
enumerable: false,
writable: true,
configurable: true,
}
});
return setPrototypeOf(Wrapper, Class);
}
return _wrapNativeSuper(Class)
}
`;
helpers.instanceof = helper("7.0.0-beta.0")`
export default function _instanceof(left, right) {
if (right != null && typeof Symbol !== "undefined" && right[Symbol.hasInstance]) {
return !!right[Symbol.hasInstance](left);
} else {
return left instanceof right;
}
}
`;
helpers.interopRequireDefault = helper("7.0.0-beta.0")`
export default function _interopRequireDefault(obj) {
return obj && obj.__esModule ? obj : { default: obj };
}
`;
helpers.interopRequireWildcard = helper("7.0.0-beta.0")`
function _getRequireWildcardCache() {
if (typeof WeakMap !== "function") return null;
var cache = new WeakMap();
_getRequireWildcardCache = function () { return cache; };
return cache;
}
export default function _interopRequireWildcard(obj) {
if (obj && obj.__esModule) {
return obj;
}
if (obj === null || (typeof obj !== "object" && typeof obj !== "function")) {
return { default: obj }
}
var cache = _getRequireWildcardCache();
if (cache && cache.has(obj)) {
return cache.get(obj);
}
var newObj = {};
var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor;
for (var key in obj) {
if (Object.prototype.hasOwnProperty.call(obj, key)) {
var desc = hasPropertyDescriptor
? Object.getOwnPropertyDescriptor(obj, key)
: null;
if (desc && (desc.get || desc.set)) {
Object.defineProperty(newObj, key, desc);
} else {
newObj[key] = obj[key];
}
}
}
newObj.default = obj;
if (cache) {
cache.set(obj, newObj);
}
return newObj;
}
`;
helpers.newArrowCheck = helper("7.0.0-beta.0")`
export default function _newArrowCheck(innerThis, boundThis) {
if (innerThis !== boundThis) {
throw new TypeError("Cannot instantiate an arrow function");
}
}
`;
helpers.objectDestructuringEmpty = helper("7.0.0-beta.0")`
export default function _objectDestructuringEmpty(obj) {
if (obj == null) throw new TypeError("Cannot destructure undefined");
}
`;
helpers.objectWithoutPropertiesLoose = helper("7.0.0-beta.0")`
export default function _objectWithoutPropertiesLoose(source, excluded) {
if (source == null) return {};
var target = {};
var sourceKeys = Object.keys(source);
var key, i;
for (i = 0; i < sourceKeys.length; i++) {
key = sourceKeys[i];
if (excluded.indexOf(key) >= 0) continue;
target[key] = source[key];
}
return target;
}
`;
helpers.objectWithoutProperties = helper("7.0.0-beta.0")`
import objectWithoutPropertiesLoose from "objectWithoutPropertiesLoose";
export default function _objectWithoutProperties(source, excluded) {
if (source == null) return {};
var target = objectWithoutPropertiesLoose(source, excluded);
var key, i;
if (Object.getOwnPropertySymbols) {
var sourceSymbolKeys = Object.getOwnPropertySymbols(source);
for (i = 0; i < sourceSymbolKeys.length; i++) {
key = sourceSymbolKeys[i];
if (excluded.indexOf(key) >= 0) continue;
if (!Object.prototype.propertyIsEnumerable.call(source, key)) continue;
target[key] = source[key];
}
}
return target;
}
`;
helpers.assertThisInitialized = helper("7.0.0-beta.0")`
export default function _assertThisInitialized(self) {
if (self === void 0) {
throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
}
return self;
}
`;
helpers.possibleConstructorReturn = helper("7.0.0-beta.0")`
import assertThisInitialized from "assertThisInitialized";
export default function _possibleConstructorReturn(self, call) {
if (call && (typeof call === "object" || typeof call === "function")) {
return call;
}
return assertThisInitialized(self);
}
`;
// This is duplicated to packages/babel-plugin-transform-classes/src/inline-createSuper-helpers.js
helpers.createSuper = helper("7.9.0")`
import getPrototypeOf from "getPrototypeOf";
import isNativeReflectConstruct from "isNativeReflectConstruct";
import possibleConstructorReturn from "possibleConstructorReturn";
export default function _createSuper(Derived) {
var hasNativeReflectConstruct = isNativeReflectConstruct();
return function _createSuperInternal() {
var Super = getPrototypeOf(Derived), result;
if (hasNativeReflectConstruct) {
// NOTE: This doesn't work if this.__proto__.constructor has been modified.
var NewTarget = getPrototypeOf(this).constructor;
result = Reflect.construct(Super, arguments, NewTarget);
} else {
result = Super.apply(this, arguments);
}
return possibleConstructorReturn(this, result);
}
}
`;
helpers.superPropBase = helper("7.0.0-beta.0")`
import getPrototypeOf from "getPrototypeOf";
export default function _superPropBase(object, property) {
// Yes, this throws if object is null to being with, that's on purpose.
while (!Object.prototype.hasOwnProperty.call(object, property)) {
object = getPrototypeOf(object);
if (object === null) break;
}
return object;
}
`;
helpers.get = helper("7.0.0-beta.0")`
import superPropBase from "superPropBase";
export default function _get(target, property, receiver) {
if (typeof Reflect !== "undefined" && Reflect.get) {
_get = Reflect.get;
} else {
_get = function _get(target, property, receiver) {
var base = superPropBase(target, property);
if (!base) return;
var desc = Object.getOwnPropertyDescriptor(base, property);
if (desc.get) {
return desc.get.call(receiver);
}
return desc.value;
};
}
return _get(target, property, receiver || target);
}
`;
helpers.set = helper("7.0.0-beta.0")`
import superPropBase from "superPropBase";
import defineProperty from "defineProperty";
function set(target, property, value, receiver) {
if (typeof Reflect !== "undefined" && Reflect.set) {
set = Reflect.set;
} else {
set = function set(target, property, value, receiver) {
var base = superPropBase(target, property);
var desc;
if (base) {
desc = Object.getOwnPropertyDescriptor(base, property);
if (desc.set) {
desc.set.call(receiver, value);
return true;
} else if (!desc.writable) {
// Both getter and non-writable fall into this.
return false;
}
}
// Without a super that defines the property, spec boils down to
// "define on receiver" for some reason.
desc = Object.getOwnPropertyDescriptor(receiver, property);
if (desc) {
if (!desc.writable) {
// Setter, getter, and non-writable fall into this.
return false;
}
desc.value = value;
Object.defineProperty(receiver, property, desc);
} else {
// Avoid setters that may be defined on Sub's prototype, but not on
// the instance.
defineProperty(receiver, property, value);
}
return true;
};
}
return set(target, property, value, receiver);
}
export default function _set(target, property, value, receiver, isStrict) {
var s = set(target, property, value, receiver || target);
if (!s && isStrict) {
throw new Error('failed to set property');
}
return value;
}
`;
helpers.taggedTemplateLiteral = helper("7.0.0-beta.0")`
export default function _taggedTemplateLiteral(strings, raw) {
if (!raw) { raw = strings.slice(0); }
return Object.freeze(Object.defineProperties(strings, {
raw: { value: Object.freeze(raw) }
}));
}
`;
helpers.taggedTemplateLiteralLoose = helper("7.0.0-beta.0")`
export default function _taggedTemplateLiteralLoose(strings, raw) {
if (!raw) { raw = strings.slice(0); }
strings.raw = raw;
return strings;
}
`;
helpers.readOnlyError = helper("7.0.0-beta.0")`
export default function _readOnlyError(name) {
throw new Error("\\"" + name + "\\" is read-only");
}
`;
helpers.classNameTDZError = helper("7.0.0-beta.0")`
export default function _classNameTDZError(name) {
throw new Error("Class \\"" + name + "\\" cannot be referenced in computed property keys.");
}
`;
helpers.temporalUndefined = helper("7.0.0-beta.0")`
// This function isn't mean to be called, but to be used as a reference.
// We can't use a normal object because it isn't hoisted.
export default function _temporalUndefined() {}
`;
helpers.tdz = helper("7.5.5")`
export default function _tdzError(name) {
throw new ReferenceError(name + " is not defined - temporal dead zone");
}
`;
helpers.temporalRef = helper("7.0.0-beta.0")`
import undef from "temporalUndefined";
import err from "tdz";
export default function _temporalRef(val, name) {
return val === undef ? err(name) : val;
}
`;
helpers.slicedToArray = helper("7.0.0-beta.0")`
import arrayWithHoles from "arrayWithHoles";
import iterableToArrayLimit from "iterableToArrayLimit";
import unsupportedIterableToArray from "unsupportedIterableToArray";
import nonIterableRest from "nonIterableRest";
export default function _slicedToArray(arr, i) {
return (
arrayWithHoles(arr) ||
iterableToArrayLimit(arr, i) ||
unsupportedIterableToArray(arr, i) ||
nonIterableRest()
);
}
`;
helpers.slicedToArrayLoose = helper("7.0.0-beta.0")`
import arrayWithHoles from "arrayWithHoles";
import iterableToArrayLimitLoose from "iterableToArrayLimitLoose";
import unsupportedIterableToArray from "unsupportedIterableToArray";
import nonIterableRest from "nonIterableRest";
export default function _slicedToArrayLoose(arr, i) {
return (
arrayWithHoles(arr) ||
iterableToArrayLimitLoose(arr, i) ||
unsupportedIterableToArray(arr, i) ||
nonIterableRest()
);
}
`;
helpers.toArray = helper("7.0.0-beta.0")`
import arrayWithHoles from "arrayWithHoles";
import iterableToArray from "iterableToArray";
import unsupportedIterableToArray from "unsupportedIterableToArray";
import nonIterableRest from "nonIterableRest";
export default function _toArray(arr) {
return (
arrayWithHoles(arr) ||
iterableToArray(arr) ||
unsupportedIterableToArray(arr) ||
nonIterableRest()
);
}
`;
helpers.toConsumableArray = helper("7.0.0-beta.0")`
import arrayWithoutHoles from "arrayWithoutHoles";
import iterableToArray from "iterableToArray";
import unsupportedIterableToArray from "unsupportedIterableToArray";
import nonIterableSpread from "nonIterableSpread";
export default function _toConsumableArray(arr) {
return (
arrayWithoutHoles(arr) ||
iterableToArray(arr) ||
unsupportedIterableToArray(arr) ||
nonIterableSpread()
);
}
`;
helpers.arrayWithoutHoles = helper("7.0.0-beta.0")`
import arrayLikeToArray from "arrayLikeToArray";
export default function _arrayWithoutHoles(arr) {
if (Array.isArray(arr)) return arrayLikeToArray(arr);
}
`;
helpers.arrayWithHoles = helper("7.0.0-beta.0")`
export default function _arrayWithHoles(arr) {
if (Array.isArray(arr)) return arr;
}
`;
helpers.maybeArrayLike = helper("7.9.0")`
import arrayLikeToArray from "arrayLikeToArray";
export default function _maybeArrayLike(next, arr, i) {
if (arr && !Array.isArray(arr) && typeof arr.length === "number") {
var len = arr.length;
return arrayLikeToArray(arr, i !== void 0 && i < len ? i : len);
}
return next(arr, i);
}
`;
helpers.iterableToArray = helper("7.0.0-beta.0")`
export default function _iterableToArray(iter) {
if (typeof Symbol !== "undefined" && Symbol.iterator in Object(iter)) return Array.from(iter);
}
`;
helpers.iterableToArrayLimit = helper("7.0.0-beta.0")`
export default function _iterableToArrayLimit(arr, i) {
// this is an expanded form of \`for...of\` that properly supports abrupt completions of
// iterators etc. variable names have been minimised to reduce the size of this massive
// helper. sometimes spec compliance is annoying :(
//
// _n = _iteratorNormalCompletion
// _d = _didIteratorError
// _e = _iteratorError
// _i = _iterator
// _s = _step
if (typeof Symbol === "undefined" || !(Symbol.iterator in Object(arr))) return;
var _arr = [];
var _n = true;
var _d = false;
var _e = undefined;
try {
for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) {
_arr.push(_s.value);
if (i && _arr.length === i) break;
}
} catch (err) {
_d = true;
_e = err;
} finally {
try {
if (!_n && _i["return"] != null) _i["return"]();
} finally {
if (_d) throw _e;
}
}
return _arr;
}
`;
helpers.iterableToArrayLimitLoose = helper("7.0.0-beta.0")`
export default function _iterableToArrayLimitLoose(arr, i) {
if (typeof Symbol === "undefined" || !(Symbol.iterator in Object(arr))) return;
var _arr = [];
for (var _iterator = arr[Symbol.iterator](), _step; !(_step = _iterator.next()).done;) {
_arr.push(_step.value);
if (i && _arr.length === i) break;
}
return _arr;
}
`;
helpers.unsupportedIterableToArray = helper("7.9.0")`
import arrayLikeToArray from "arrayLikeToArray";
export default function _unsupportedIterableToArray(o, minLen) {
if (!o) return;
if (typeof o === "string") return arrayLikeToArray(o, minLen);
var n = Object.prototype.toString.call(o).slice(8, -1);
if (n === "Object" && o.constructor) n = o.constructor.name;
if (n === "Map" || n === "Set") return Array.from(o);
if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n))
return arrayLikeToArray(o, minLen);
}
`;
helpers.arrayLikeToArray = helper("7.9.0")`
export default function _arrayLikeToArray(arr, len) {
if (len == null || len > arr.length) len = arr.length;
for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i];
return arr2;
}
`;
helpers.nonIterableSpread = helper("7.0.0-beta.0")`
export default function _nonIterableSpread() {
throw new TypeError(
"Invalid attempt to spread non-iterable instance.\\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."
);
}
`;
helpers.nonIterableRest = helper("7.0.0-beta.0")`
export default function _nonIterableRest() {
throw new TypeError(
"Invalid attempt to destructure non-iterable instance.\\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."
);
}
`;
helpers.createForOfIteratorHelper = helper("7.9.0")`
import unsupportedIterableToArray from "unsupportedIterableToArray";
// s: start (create the iterator)
// n: next
// e: error (called whenever something throws)
// f: finish (always called at the end)
export default function _createForOfIteratorHelper(o, allowArrayLike) {
var it;
if (typeof Symbol === "undefined" || o[Symbol.iterator] == null) {
// Fallback for engines without symbol support
if (
Array.isArray(o) ||
(it = unsupportedIterableToArray(o)) ||
(allowArrayLike && o && typeof o.length === "number")
) {
if (it) o = it;
var i = 0;
var F = function(){};
return {
s: F,
n: function() {
if (i >= o.length) return { done: true };
return { done: false, value: o[i++] };
},
e: function(e) { throw e; },
f: F,
};
}
throw new TypeError("Invalid attempt to iterate non-iterable instance.\\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
}
var normalCompletion = true, didErr = false, err;
return {
s: function() {
it = o[Symbol.iterator]();
},
n: function() {
var step = it.next();
normalCompletion = step.done;
return step;
},
e: function(e) {
didErr = true;
err = e;
},
f: function() {
try {
if (!normalCompletion && it.return != null) it.return();
} finally {
if (didErr) throw err;
}
}
};
}
`;
helpers.createForOfIteratorHelperLoose = helper("7.9.0")`
import unsupportedIterableToArray from "unsupportedIterableToArray";
export default function _createForOfIteratorHelperLoose(o, allowArrayLike) {
var it;
if (typeof Symbol === "undefined" || o[Symbol.iterator] == null) {
// Fallback for engines without symbol support
if (
Array.isArray(o) ||
(it = unsupportedIterableToArray(o)) ||
(allowArrayLike && o && typeof o.length === "number")
) {
if (it) o = it;
var i = 0;
return function() {
if (i >= o.length) return { done: true };
return { done: false, value: o[i++] };
}
}
throw new TypeError("Invalid attempt to iterate non-iterable instance.\\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
}
it = o[Symbol.iterator]();
return it.next.bind(it);
}
`;
helpers.skipFirstGeneratorNext = helper("7.0.0-beta.0")`
export default function _skipFirstGeneratorNext(fn) {
return function () {
var it = fn.apply(this, arguments);
it.next();
return it;
}
}
`;
helpers.toPrimitive = helper("7.1.5")`
export default function _toPrimitive(
input,
hint /*: "default" | "string" | "number" | void */
) {
if (typeof input !== "object" || input === null) return input;
var prim = input[Symbol.toPrimitive];
if (prim !== undefined) {
var res = prim.call(input, hint || "default");
if (typeof res !== "object") return res;
throw new TypeError("@@toPrimitive must return a primitive value.");
}
return (hint === "string" ? String : Number)(input);
}
`;
helpers.toPropertyKey = helper("7.1.5")`
import toPrimitive from "toPrimitive";
export default function _toPropertyKey(arg) {
var key = toPrimitive(arg, "string");
return typeof key === "symbol" ? key : String(key);
}
`;
/**
* Add a helper that will throw a useful error if the transform fails to detect the class
* property assignment, so users know something failed.
*/
helpers.initializerWarningHelper = helper("7.0.0-beta.0")`
export default function _initializerWarningHelper(descriptor, context){
throw new Error(
'Decorating class property failed. Please ensure that ' +
'proposal-class-properties is enabled and runs after the decorators transform.'
);
}
`;
/**
* Add a helper to call as a replacement for class property definition.
*/
helpers.initializerDefineProperty = helper("7.0.0-beta.0")`
export default function _initializerDefineProperty(target, property, descriptor, context){
if (!descriptor) return;
Object.defineProperty(target, property, {
enumerable: descriptor.enumerable,
configurable: descriptor.configurable,
writable: descriptor.writable,
value: descriptor.initializer ? descriptor.initializer.call(context) : void 0,
});
}
`;
/**
* Add a helper to take an initial descriptor, apply some decorators to it, and optionally
* define the property.
*/
helpers.applyDecoratedDescriptor = helper("7.0.0-beta.0")`
export default function _applyDecoratedDescriptor(target, property, decorators, descriptor, context){
var desc = {};
Object.keys(descriptor).forEach(function(key){
desc[key] = descriptor[key];
});
desc.enumerable = !!desc.enumerable;
desc.configurable = !!desc.configurable;
if ('value' in desc || desc.initializer){
desc.writable = true;
}
desc = decorators.slice().reverse().reduce(function(desc, decorator){
return decorator(target, property, desc) || desc;
}, desc);
if (context && desc.initializer !== void 0){
desc.value = desc.initializer ? desc.initializer.call(context) : void 0;
desc.initializer = undefined;
}
if (desc.initializer === void 0){
// This is a hack to avoid this being processed by 'transform-runtime'.
// See issue #9.
Object.defineProperty(target, property, desc);
desc = null;
}
return desc;
}
`;
helpers.classPrivateFieldLooseKey = helper("7.0.0-beta.0")`
var id = 0;
export default function _classPrivateFieldKey(name) {
return "__private_" + (id++) + "_" + name;
}
`;
helpers.classPrivateFieldLooseBase = helper("7.0.0-beta.0")`
export default function _classPrivateFieldBase(receiver, privateKey) {
if (!Object.prototype.hasOwnProperty.call(receiver, privateKey)) {
throw new TypeError("attempted to use private field on non-instance");
}
return receiver;
}
`;
helpers.classPrivateFieldGet = helper("7.0.0-beta.0")`
export default function _classPrivateFieldGet(receiver, privateMap) {
var descriptor = privateMap.get(receiver);
if (!descriptor) {
throw new TypeError("attempted to get private field on non-instance");
}
if (descriptor.get) {
return descriptor.get.call(receiver);
}
return descriptor.value;
}
`;
helpers.classPrivateFieldSet = helper("7.0.0-beta.0")`
export default function _classPrivateFieldSet(receiver, privateMap, value) {
var descriptor = privateMap.get(receiver);
if (!descriptor) {
throw new TypeError("attempted to set private field on non-instance");
}
if (descriptor.set) {
descriptor.set.call(receiver, value);
} else {
if (!descriptor.writable) {
// This should only throw in strict mode, but class bodies are
// always strict and private fields can only be used inside
// class bodies.
throw new TypeError("attempted to set read only private field");
}
descriptor.value = value;
}
return value;
}
`;
helpers.classPrivateFieldDestructureSet = helper("7.4.4")`
export default function _classPrivateFieldDestructureSet(receiver, privateMap) {
if (!privateMap.has(receiver)) {
throw new TypeError("attempted to set private field on non-instance");
}
var descriptor = privateMap.get(receiver);
if (descriptor.set) {
if (!("__destrObj" in descriptor)) {
descriptor.__destrObj = {
set value(v) {
descriptor.set.call(receiver, v)
},
};
}
return descriptor.__destrObj;
} else {
if (!descriptor.writable) {
// This should only throw in strict mode, but class bodies are
// always strict and private fields can only be used inside
// class bodies.
throw new TypeError("attempted to set read only private field");
}
return descriptor;
}
}
`;
helpers.classStaticPrivateFieldSpecGet = helper("7.0.2")`
export default function _classStaticPrivateFieldSpecGet(receiver, classConstructor, descriptor) {
if (receiver !== classConstructor) {
throw new TypeError("Private static access of wrong provenance");
}
if (descriptor.get) {
return descriptor.get.call(receiver);
}
return descriptor.value;
}
`;
helpers.classStaticPrivateFieldSpecSet = helper("7.0.2")`
export default function _classStaticPrivateFieldSpecSet(receiver, classConstructor, descriptor, value) {
if (receiver !== classConstructor) {
throw new TypeError("Private static access of wrong provenance");
}
if (descriptor.set) {
descriptor.set.call(receiver, value);
} else {
if (!descriptor.writable) {
// This should only throw in strict mode, but class bodies are
// always strict and private fields can only be used inside
// class bodies.
throw new TypeError("attempted to set read only private field");
}
descriptor.value = value;
}
return value;
}
`;
helpers.classStaticPrivateMethodGet = helper("7.3.2")`
export default function _classStaticPrivateMethodGet(receiver, classConstructor, method) {
if (receiver !== classConstructor) {
throw new TypeError("Private static access of wrong provenance");
}
return method;
}
`;
helpers.classStaticPrivateMethodSet = helper("7.3.2")`
export default function _classStaticPrivateMethodSet() {
throw new TypeError("attempted to set read only static private field");
}
`;
helpers.decorate = helper("7.1.5")`
import toArray from "toArray";
import toPropertyKey from "toPropertyKey";
// These comments are stripped by @babel/template
/*::
type PropertyDescriptor =
| {
value: any,
writable: boolean,
configurable: boolean,
enumerable: boolean,
}
| {
get?: () => any,
set?: (v: any) => void,
configurable: boolean,
enumerable: boolean,
};
type FieldDescriptor ={
writable: boolean,
configurable: boolean,
enumerable: boolean,
};
type Placement = "static" | "prototype" | "own";
type Key = string | symbol; // PrivateName is not supported yet.
type ElementDescriptor =
| {
kind: "method",
key: Key,
placement: Placement,
descriptor: PropertyDescriptor
}
| {
kind: "field",
key: Key,
placement: Placement,
descriptor: FieldDescriptor,
initializer?: () => any,
};
// This is exposed to the user code
type ElementObjectInput = ElementDescriptor & {
[@@toStringTag]?: "Descriptor"
};
// This is exposed to the user code
type ElementObjectOutput = ElementDescriptor & {
[@@toStringTag]?: "Descriptor"
extras?: ElementDescriptor[],
finisher?: ClassFinisher,
};
// This is exposed to the user code
type ClassObject = {
[@@toStringTag]?: "Descriptor",
kind: "class",
elements: ElementDescriptor[],
};
type ElementDecorator = (descriptor: ElementObjectInput) => ?ElementObjectOutput;
type ClassDecorator = (descriptor: ClassObject) => ?ClassObject;
type ClassFinisher = <A, B>(cl: Class<A>) => Class<B>;
// Only used by Babel in the transform output, not part of the spec.
type ElementDefinition =
| {
kind: "method",
value: any,
key: Key,
static?: boolean,
decorators?: ElementDecorator[],
}
| {
kind: "field",
value: () => any,
key: Key,
static?: boolean,
decorators?: ElementDecorator[],
};
declare function ClassFactory<C>(initialize: (instance: C) => void): {
F: Class<C>,
d: ElementDefinition[]
}
*/
/*::
// Various combinations with/without extras and with one or many finishers
type ElementFinisherExtras = {
element: ElementDescriptor,
finisher?: ClassFinisher,
extras?: ElementDescriptor[],
};
type ElementFinishersExtras = {
element: ElementDescriptor,
finishers: ClassFinisher[],
extras: ElementDescriptor[],
};
type ElementsFinisher = {
elements: ElementDescriptor[],
finisher?: ClassFinisher,
};
type ElementsFinishers = {
elements: ElementDescriptor[],
finishers: ClassFinisher[],
};
*/
/*::
type Placements = {
static: Key[],
prototype: Key[],
own: Key[],
};
*/
// ClassDefinitionEvaluation (Steps 26-*)
export default function _decorate(
decorators /*: ClassDecorator[] */,
factory /*: ClassFactory */,
superClass /*: ?Class<*> */,
mixins /*: ?Array<Function> */,
) /*: Class<*> */ {
var api = _getDecoratorsApi();
if (mixins) {
for (var i = 0; i < mixins.length; i++) {
api = mixins[i](api);
}
}
var r = factory(function initialize(O) {
api.initializeInstanceElements(O, decorated.elements);
}, superClass);
var decorated = api.decorateClass(
_coalesceClassElements(r.d.map(_createElementDescriptor)),
decorators,
);
api.initializeClassElements(r.F, decorated.elements);
return api.runClassFinishers(r.F, decorated.finishers);
}
function _getDecoratorsApi() {
_getDecoratorsApi = function() {
return api;
};
var api = {
elementsDefinitionOrder: [["method"], ["field"]],
// InitializeInstanceElements
initializeInstanceElements: function(
/*::<C>*/ O /*: C */,
elements /*: ElementDescriptor[] */,
) {
["method", "field"].forEach(function(kind) {
elements.forEach(function(element /*: ElementDescriptor */) {
if (element.kind === kind && element.placement === "own") {
this.defineClassElement(O, element);
}
}, this);
}, this);
},
// InitializeClassElements
initializeClassElements: function(
/*::<C>*/ F /*: Class<C> */,
elements /*: ElementDescriptor[] */,
) {
var proto = F.prototype;
["method", "field"].forEach(function(kind) {
elements.forEach(function(element /*: ElementDescriptor */) {
var placement = element.placement;
if (
element.kind === kind &&
(placement === "static" || placement === "prototype")
) {
var receiver = placement === "static" ? F : proto;
this.defineClassElement(receiver, element);
}
}, this);
}, this);
},
// DefineClassElement
defineClassElement: function(
/*::<C>*/ receiver /*: C | Class<C> */,
element /*: ElementDescriptor */,
) {
var descriptor /*: PropertyDescriptor */ = element.descriptor;
if (element.kind === "field") {
var initializer = element.initializer;
descriptor = {
enumerable: descriptor.enumerable,
writable: descriptor.writable,
configurable: descriptor.configurable,
value: initializer === void 0 ? void 0 : initializer.call(receiver),
};
}
Object.defineProperty(receiver, element.key, descriptor);
},
// DecorateClass
decorateClass: function(
elements /*: ElementDescriptor[] */,
decorators /*: ClassDecorator[] */,
) /*: ElementsFinishers */ {
var newElements /*: ElementDescriptor[] */ = [];
var finishers /*: ClassFinisher[] */ = [];
var placements /*: Placements */ = {
static: [],
prototype: [],
own: [],
};
elements.forEach(function(element /*: ElementDescriptor */) {
this.addElementPlacement(element, placements);
}, this);
elements.forEach(function(element /*: ElementDescriptor */) {
if (!_hasDecorators(element)) return newElements.push(element);
var elementFinishersExtras /*: ElementFinishersExtras */ = this.decorateElement(
element,
placements,
);
newElements.push(elementFinishersExtras.element);
newElements.push.apply(newElements, elementFinishersExtras.extras);
finishers.push.apply(finishers, elementFinishersExtras.finishers);
}, this);
if (!decorators) {
return { elements: newElements, finishers: finishers };
}
var result /*: ElementsFinishers */ = this.decorateConstructor(
newElements,
decorators,
);
finishers.push.apply(finishers, result.finishers);
result.finishers = finishers;
return result;
},
// AddElementPlacement
addElementPlacement: function(
element /*: ElementDescriptor */,
placements /*: Placements */,
silent /*: boolean */,
) {
var keys = placements[element.placement];
if (!silent && keys.indexOf(element.key) !== -1) {
throw new TypeError("Duplicated element (" + element.key + ")");
}
keys.push(element.key);
},
// DecorateElement
decorateElement: function(
element /*: ElementDescriptor */,
placements /*: Placements */,
) /*: ElementFinishersExtras */ {
var extras /*: ElementDescriptor[] */ = [];
var finishers /*: ClassFinisher[] */ = [];
for (
var decorators = element.decorators, i = decorators.length - 1;
i >= 0;
i--
) {
// (inlined) RemoveElementPlacement
var keys = placements[element.placement];
keys.splice(keys.indexOf(element.key), 1);
var elementObject /*: ElementObjectInput */ = this.fromElementDescriptor(
element,
);
var elementFinisherExtras /*: ElementFinisherExtras */ = this.toElementFinisherExtras(
(0, decorators[i])(elementObject) /*: ElementObjectOutput */ ||
elementObject,
);
element = elementFinisherExtras.element;
this.addElementPlacement(element, placements);
if (elementFinisherExtras.finisher) {
finishers.push(elementFinisherExtras.finisher);
}
var newExtras /*: ElementDescriptor[] | void */ =
elementFinisherExtras.extras;
if (newExtras) {
for (var j = 0; j < newExtras.length; j++) {
this.addElementPlacement(newExtras[j], placements);
}
extras.push.apply(extras, newExtras);
}
}
return { element: element, finishers: finishers, extras: extras };
},
// DecorateConstructor
decorateConstructor: function(
elements /*: ElementDescriptor[] */,
decorators /*: ClassDecorator[] */,
) /*: ElementsFinishers */ {
var finishers /*: ClassFinisher[] */ = [];
for (var i = decorators.length - 1; i >= 0; i--) {
var obj /*: ClassObject */ = this.fromClassDescriptor(elements);
var elementsAndFinisher /*: ElementsFinisher */ = this.toClassDescriptor(
(0, decorators[i])(obj) /*: ClassObject */ || obj,
);
if (elementsAndFinisher.finisher !== undefined) {
finishers.push(elementsAndFinisher.finisher);
}
if (elementsAndFinisher.elements !== undefined) {
elements = elementsAndFinisher.elements;
for (var j = 0; j < elements.length - 1; j++) {
for (var k = j + 1; k < elements.length; k++) {
if (
elements[j].key === elements[k].key &&
elements[j].placement === elements[k].placement
) {
throw new TypeError(
"Duplicated element (" + elements[j].key + ")",
);
}
}
}
}
}
return { elements: elements, finishers: finishers };
},
// FromElementDescriptor
fromElementDescriptor: function(
element /*: ElementDescriptor */,
) /*: ElementObject */ {
var obj /*: ElementObject */ = {
kind: element.kind,
key: element.key,
placement: element.placement,
descriptor: element.descriptor,
};
var desc = {
value: "Descriptor",
configurable: true,
};
Object.defineProperty(obj, Symbol.toStringTag, desc);
if (element.kind === "field") obj.initializer = element.initializer;
return obj;
},
// ToElementDescriptors
toElementDescriptors: function(
elementObjects /*: ElementObject[] */,
) /*: ElementDescriptor[] */ {
if (elementObjects === undefined) return;
return toArray(elementObjects).map(function(elementObject) {
var element = this.toElementDescriptor(elementObject);
this.disallowProperty(elementObject, "finisher", "An element descriptor");
this.disallowProperty(elementObject, "extras", "An element descriptor");
return element;
}, this);
},
// ToElementDescriptor
toElementDescriptor: function(
elementObject /*: ElementObject */,
) /*: ElementDescriptor */ {
var kind = String(elementObject.kind);
if (kind !== "method" && kind !== "field") {
throw new TypeError(
'An element descriptor\\'s .kind property must be either "method" or' +
' "field", but a decorator created an element descriptor with' +
' .kind "' +
kind +
'"',
);
}
var key = toPropertyKey(elementObject.key);
var placement = String(elementObject.placement);
if (
placement !== "static" &&
placement !== "prototype" &&
placement !== "own"
) {
throw new TypeError(
'An element descriptor\\'s .placement property must be one of "static",' +
' "prototype" or "own", but a decorator created an element descriptor' +
' with .placement "' +
placement +
'"',
);
}
var descriptor /*: PropertyDescriptor */ = elementObject.descriptor;
this.disallowProperty(elementObject, "elements", "An element descriptor");
var element /*: ElementDescriptor */ = {
kind: kind,
key: key,
placement: placement,
descriptor: Object.assign({}, descriptor),
};
if (kind !== "field") {
this.disallowProperty(elementObject, "initializer", "A method descriptor");
} else {
this.disallowProperty(
descriptor,
"get",
"The property descriptor of a field descriptor",
);
this.disallowProperty(
descriptor,
"set",
"The property descriptor of a field descriptor",
);
this.disallowProperty(
descriptor,
"value",
"The property descriptor of a field descriptor",
);
element.initializer = elementObject.initializer;
}
return element;
},
toElementFinisherExtras: function(
elementObject /*: ElementObject */,
) /*: ElementFinisherExtras */ {
var element /*: ElementDescriptor */ = this.toElementDescriptor(
elementObject,
);
var finisher /*: ClassFinisher */ = _optionalCallableProperty(
elementObject,
"finisher",
);
var extras /*: ElementDescriptors[] */ = this.toElementDescriptors(
elementObject.extras,
);
return { element: element, finisher: finisher, extras: extras };
},
// FromClassDescriptor
fromClassDescriptor: function(
elements /*: ElementDescriptor[] */,
) /*: ClassObject */ {
var obj = {
kind: "class",
elements: elements.map(this.fromElementDescriptor, this),
};
var desc = { value: "Descriptor", configurable: true };
Object.defineProperty(obj, Symbol.toStringTag, desc);
return obj;
},
// ToClassDescriptor
toClassDescriptor: function(
obj /*: ClassObject */,
) /*: ElementsFinisher */ {
var kind = String(obj.kind);
if (kind !== "class") {
throw new TypeError(
'A class descriptor\\'s .kind property must be "class", but a decorator' +
' created a class descriptor with .kind "' +
kind +
'"',
);
}
this.disallowProperty(obj, "key", "A class descriptor");
this.disallowProperty(obj, "placement", "A class descriptor");
this.disallowProperty(obj, "descriptor", "A class descriptor");
this.disallowProperty(obj, "initializer", "A class descriptor");
this.disallowProperty(obj, "extras", "A class descriptor");
var finisher = _optionalCallableProperty(obj, "finisher");
var elements = this.toElementDescriptors(obj.elements);
return { elements: elements, finisher: finisher };
},
// RunClassFinishers
runClassFinishers: function(
constructor /*: Class<*> */,
finishers /*: ClassFinisher[] */,
) /*: Class<*> */ {
for (var i = 0; i < finishers.length; i++) {
var newConstructor /*: ?Class<*> */ = (0, finishers[i])(constructor);
if (newConstructor !== undefined) {
// NOTE: This should check if IsConstructor(newConstructor) is false.
if (typeof newConstructor !== "function") {
throw new TypeError("Finishers must return a constructor.");
}
constructor = newConstructor;
}
}
return constructor;
},
disallowProperty: function(obj, name, objectType) {
if (obj[name] !== undefined) {
throw new TypeError(objectType + " can't have a ." + name + " property.");
}
}
};
return api;
}
// ClassElementEvaluation
function _createElementDescriptor(
def /*: ElementDefinition */,
) /*: ElementDescriptor */ {
var key = toPropertyKey(def.key);
var descriptor /*: PropertyDescriptor */;
if (def.kind === "method") {
descriptor = {
value: def.value,
writable: true,
configurable: true,
enumerable: false,
};
} else if (def.kind === "get") {
descriptor = { get: def.value, configurable: true, enumerable: false };
} else if (def.kind === "set") {
descriptor = { set: def.value, configurable: true, enumerable: false };
} else if (def.kind === "field") {
descriptor = { configurable: true, writable: true, enumerable: true };
}
var element /*: ElementDescriptor */ = {
kind: def.kind === "field" ? "field" : "method",
key: key,
placement: def.static
? "static"
: def.kind === "field"
? "own"
: "prototype",
descriptor: descriptor,
};
if (def.decorators) element.decorators = def.decorators;
if (def.kind === "field") element.initializer = def.value;
return element;
}
// CoalesceGetterSetter
function _coalesceGetterSetter(
element /*: ElementDescriptor */,
other /*: ElementDescriptor */,
) {
if (element.descriptor.get !== undefined) {
other.descriptor.get = element.descriptor.get;
} else {
other.descriptor.set = element.descriptor.set;
}
}
// CoalesceClassElements
function _coalesceClassElements(
elements /*: ElementDescriptor[] */,
) /*: ElementDescriptor[] */ {
var newElements /*: ElementDescriptor[] */ = [];
var isSameElement = function(
other /*: ElementDescriptor */,
) /*: boolean */ {
return (
other.kind === "method" &&
other.key === element.key &&
other.placement === element.placement
);
};
for (var i = 0; i < elements.length; i++) {
var element /*: ElementDescriptor */ = elements[i];
var other /*: ElementDescriptor */;
if (
element.kind === "method" &&
(other = newElements.find(isSameElement))
) {
if (
_isDataDescriptor(element.descriptor) ||
_isDataDescriptor(other.descriptor)
) {
if (_hasDecorators(element) || _hasDecorators(other)) {
throw new ReferenceError(
"Duplicated methods (" + element.key + ") can't be decorated.",
);
}
other.descriptor = element.descriptor;
} else {
if (_hasDecorators(element)) {
if (_hasDecorators(other)) {
throw new ReferenceError(
"Decorators can't be placed on different accessors with for " +
"the same property (" +
element.key +
").",
);
}
other.decorators = element.decorators;
}
_coalesceGetterSetter(element, other);
}
} else {
newElements.push(element);
}
}
return newElements;
}
function _hasDecorators(element /*: ElementDescriptor */) /*: boolean */ {
return element.decorators && element.decorators.length;
}
function _isDataDescriptor(desc /*: PropertyDescriptor */) /*: boolean */ {
return (
desc !== undefined &&
!(desc.value === undefined && desc.writable === undefined)
);
}
function _optionalCallableProperty /*::<T>*/(
obj /*: T */,
name /*: $Keys<T> */,
) /*: ?Function */ {
var value = obj[name];
if (value !== undefined && typeof value !== "function") {
throw new TypeError("Expected '" + name + "' to be a function");
}
return value;
}
`;
helpers.classPrivateMethodGet = helper("7.1.6")`
export default function _classPrivateMethodGet(receiver, privateSet, fn) {
if (!privateSet.has(receiver)) {
throw new TypeError("attempted to get private field on non-instance");
}
return fn;
}
`;
helpers.classPrivateMethodSet = helper("7.1.6")`
export default function _classPrivateMethodSet() {
throw new TypeError("attempted to reassign private method");
}
`;
helpers.wrapRegExp = helper("7.2.6")`
import wrapNativeSuper from "wrapNativeSuper";
import getPrototypeOf from "getPrototypeOf";
import possibleConstructorReturn from "possibleConstructorReturn";
import inherits from "inherits";
export default function _wrapRegExp(re, groups) {
_wrapRegExp = function(re, groups) {
return new BabelRegExp(re, undefined, groups);
};
var _RegExp = wrapNativeSuper(RegExp);
var _super = RegExp.prototype;
var _groups = new WeakMap();
function BabelRegExp(re, flags, groups) {
var _this = _RegExp.call(this, re, flags);
// if the regex is recreated with 'g' flag
_groups.set(_this, groups || _groups.get(re));
return _this;
}
inherits(BabelRegExp, _RegExp);
BabelRegExp.prototype.exec = function(str) {
var result = _super.exec.call(this, str);
if (result) result.groups = buildGroups(result, this);
return result;
};
BabelRegExp.prototype[Symbol.replace] = function(str, substitution) {
if (typeof substitution === "string") {
var groups = _groups.get(this);
return _super[Symbol.replace].call(
this,
str,
substitution.replace(/\\$<([^>]+)>/g, function(_, name) {
return "$" + groups[name];
})
);
} else if (typeof substitution === "function") {
var _this = this;
return _super[Symbol.replace].call(
this,
str,
function() {
var args = [];
args.push.apply(args, arguments);
if (typeof args[args.length - 1] !== "object") {
// Modern engines already pass result.groups as the last arg.
args.push(buildGroups(args, _this));
}
return substitution.apply(this, args);
}
);
} else {
return _super[Symbol.replace].call(this, str, substitution);
}
}
function buildGroups(result, re) {
// NOTE: This function should return undefined if there are no groups,
// but in that case Babel doesn't add the wrapper anyway.
var g = _groups.get(re);
return Object.keys(g).reduce(function(groups, name) {
groups[name] = result[g[name]];
return groups;
}, Object.create(null));
}
return _wrapRegExp.apply(this, arguments);
}
`;