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Lazy-initialize helper templates.

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This commit is contained in:
Logan Smyth
2017-12-01 17:11:11 -08:00
parent cb4f4f4d5f
commit dffcef785a
1 changed files with 88 additions and 92 deletions
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180
packages/babel-helpers/src/helpers.js
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@@ -5,11 +5,7 @@ import template from "@babel/template";
const helpers = {};
export default helpers;
// Helpers never include placeholders, so we disable placeholder pattern
// matching to allow us to use pattern-like variable names.
const defineHelper = template.program({ placeholderPattern: false });
helpers.typeof = defineHelper(`
helpers.typeof = () => template.program.ast`
export default function _typeof(obj) {
if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
_typeof = function (obj) { return typeof obj; };
@@ -23,9 +19,9 @@ helpers.typeof = defineHelper(`
return _typeof(obj);
}
`);
`;
helpers.jsx = defineHelper(`
helpers.jsx = () => template.program.ast`
var REACT_ELEMENT_TYPE;
export default function _createRawReactElement(type, props, key, children) {
@@ -72,9 +68,9 @@ helpers.jsx = defineHelper(`
_owner: null,
};
}
`);
`;
helpers.asyncIterator = defineHelper(`
helpers.asyncIterator = () => template.program.ast`
export default function _asyncIterator(iterable) {
if (typeof Symbol === "function") {
if (Symbol.asyncIterator) {
@@ -87,15 +83,15 @@ helpers.asyncIterator = defineHelper(`
}
throw new TypeError("Object is not async iterable");
}
`);
`;
helpers.AwaitValue = defineHelper(`
helpers.AwaitValue = () => template.program.ast`
export default function _AwaitValue(value) {
this.wrapped = value;
}
`);
`;
helpers.AsyncGenerator = defineHelper(`
helpers.AsyncGenerator = () => template.program.ast`
import AwaitValue from "AwaitValue";
export default function AsyncGenerator(gen) {
@@ -177,9 +173,9 @@ helpers.AsyncGenerator = defineHelper(`
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 = defineHelper(`
helpers.wrapAsyncGenerator = () => template.program.ast`
import AsyncGenerator from "AsyncGenerator";
export default function _wrapAsyncGenerator(fn) {
@@ -187,17 +183,17 @@ helpers.wrapAsyncGenerator = defineHelper(`
return new AsyncGenerator(fn.apply(this, arguments));
};
}
`);
`;
helpers.awaitAsyncGenerator = defineHelper(`
helpers.awaitAsyncGenerator = () => template.program.ast`
import AwaitValue from "AwaitValue";
export default function _awaitAsyncGenerator(value) {
return new AwaitValue(value);
}
`);
`;
helpers.asyncGeneratorDelegate = defineHelper(`
helpers.asyncGeneratorDelegate = () => template.program.ast`
export default function _asyncGeneratorDelegate(inner, awaitWrap) {
var iter = {}, waiting = false;
@@ -237,9 +233,9 @@ helpers.asyncGeneratorDelegate = defineHelper(`
return iter;
}
`);
`;
helpers.asyncToGenerator = defineHelper(`
helpers.asyncToGenerator = () => template.program.ast`
export default function _asyncToGenerator(fn) {
return function () {
var self = this, args = arguments;
@@ -267,17 +263,17 @@ helpers.asyncToGenerator = defineHelper(`
});
};
}
`);
`;
helpers.classCallCheck = defineHelper(`
helpers.classCallCheck = () => template.program.ast`
export default function _classCallCheck(instance, Constructor) {
if (!(instance instanceof Constructor)) {
throw new TypeError("Cannot call a class as a function");
}
}
`);
`;
helpers.createClass = defineHelper(`
helpers.createClass = () => template.program.ast`
function _defineProperties(target, props) {
for (var i = 0; i < props.length; i ++) {
var descriptor = props[i];
@@ -293,9 +289,9 @@ helpers.createClass = defineHelper(`
if (staticProps) _defineProperties(Constructor, staticProps);
return Constructor;
}
`);
`;
helpers.defineEnumerableProperties = defineHelper(`
helpers.defineEnumerableProperties = () => template.program.ast`
export default function _defineEnumerableProperties(obj, descs) {
for (var key in descs) {
var desc = descs[key];
@@ -319,9 +315,9 @@ helpers.defineEnumerableProperties = defineHelper(`
}
return obj;
}
`);
`;
helpers.defaults = defineHelper(`
helpers.defaults = () => template.program.ast`
export default function _defaults(obj, defaults) {
var keys = Object.getOwnPropertyNames(defaults);
for (var i = 0; i < keys.length; i++) {
@@ -333,9 +329,9 @@ helpers.defaults = defineHelper(`
}
return obj;
}
`);
`;
helpers.defineProperty = defineHelper(`
helpers.defineProperty = () => template.program.ast`
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
@@ -354,9 +350,9 @@ helpers.defineProperty = defineHelper(`
}
return obj;
}
`);
`;
helpers.extends = defineHelper(`
helpers.extends = () => template.program.ast`
export default function _extends() {
_extends = Object.assign || function (target) {
for (var i = 1; i < arguments.length; i++) {
@@ -372,9 +368,9 @@ helpers.extends = defineHelper(`
return _extends.apply(this, arguments);
}
`);
`;
helpers.objectSpread = defineHelper(`
helpers.objectSpread = () => template.program.ast`
import defineProperty from "defineProperty";
export default function _objectSpread(target) {
@@ -392,9 +388,9 @@ helpers.objectSpread = defineHelper(`
}
return target;
}
`);
`;
helpers.get = defineHelper(`
helpers.get = () => template.program.ast`
export default function _get(object, property, receiver) {
if (object === null) object = Function.prototype;
@@ -420,9 +416,9 @@ helpers.get = defineHelper(`
return getter.call(receiver);
}
}
`);
`;
helpers.inherits = defineHelper(`
helpers.inherits = () => template.program.ast`
export default function _inherits(subClass, superClass) {
if (typeof superClass !== "function" && superClass !== null) {
throw new TypeError("Super expression must either be null or a function");
@@ -437,18 +433,18 @@ helpers.inherits = defineHelper(`
});
if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass;
}
`);
`;
helpers.inheritsLoose = defineHelper(`
helpers.inheritsLoose = () => template.program.ast`
export default function _inheritsLoose(subClass, superClass) {
subClass.prototype = Object.create(superClass.prototype);
subClass.prototype.constructor = subClass;
subClass.__proto__ = superClass;
}
`);
`;
// Based on https://github.com/WebReflection/babel-plugin-transform-builtin-classes
helpers.wrapNativeSuper = defineHelper(`
helpers.wrapNativeSuper = () => template.program.ast`
var _gPO = Object.getPrototypeOf || function _gPO(o) { return o.__proto__ };
var _sPO = Object.setPrototypeOf || function _sPO(o, p) { o.__proto__ = p; return o };
var _construct = (typeof Reflect === "object" && Reflect.construct) ||
@@ -490,9 +486,9 @@ helpers.wrapNativeSuper = defineHelper(`
)
);
}
`);
`;
helpers.instanceof = defineHelper(`
helpers.instanceof = () => template.program.ast`
export default function _instanceof(left, right) {
if (right != null && typeof Symbol !== "undefined" && right[Symbol.hasInstance]) {
return right[Symbol.hasInstance](left);
@@ -500,15 +496,15 @@ helpers.instanceof = defineHelper(`
return left instanceof right;
}
}
`);
`;
helpers.interopRequireDefault = defineHelper(`
helpers.interopRequireDefault = () => template.program.ast`
export default function _interopRequireDefault(obj) {
return obj && obj.__esModule ? obj : { default: obj };
}
`);
`;
helpers.interopRequireWildcard = defineHelper(`
helpers.interopRequireWildcard = () => template.program.ast`
export default function _interopRequireWildcard(obj) {
if (obj && obj.__esModule) {
return obj;
@@ -532,23 +528,23 @@ helpers.interopRequireWildcard = defineHelper(`
return newObj;
}
}
`);
`;
helpers.newArrowCheck = defineHelper(`
helpers.newArrowCheck = () => template.program.ast`
export default function _newArrowCheck(innerThis, boundThis) {
if (innerThis !== boundThis) {
throw new TypeError("Cannot instantiate an arrow function");
}
}
`);
`;
helpers.objectDestructuringEmpty = defineHelper(`
helpers.objectDestructuringEmpty = () => template.program.ast`
export default function _objectDestructuringEmpty(obj) {
if (obj == null) throw new TypeError("Cannot destructure undefined");
}
`);
`;
helpers.objectWithoutProperties = defineHelper(`
helpers.objectWithoutProperties = () => template.program.ast`
export default function _objectWithoutProperties(source, excluded) {
if (source == null) return {};
@@ -574,18 +570,18 @@ helpers.objectWithoutProperties = defineHelper(`
return target;
}
`);
`;
helpers.assertThisInitialized = defineHelper(`
helpers.assertThisInitialized = () => template.program.ast`
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 = defineHelper(`
helpers.possibleConstructorReturn = () => template.program.ast`
export default function _possibleConstructorReturn(self, call) {
if (call && (typeof call === "object" || typeof call === "function")) {
return call;
@@ -598,9 +594,9 @@ helpers.possibleConstructorReturn = defineHelper(`
}
return self;
}
`);
`;
helpers.set = defineHelper(`
helpers.set = () => template.program.ast`
export default function _set(object, property, value, receiver) {
var desc = Object.getOwnPropertyDescriptor(object, property);
@@ -622,9 +618,9 @@ helpers.set = defineHelper(`
return value;
}
`);
`;
helpers.slicedToArray = defineHelper(`
helpers.slicedToArray = () => template.program.ast`
// Broken out into a separate function to avoid deoptimizations due to the try/catch for the
// array iterator case.
function _sliceIterator(arr, i) {
@@ -669,9 +665,9 @@ helpers.slicedToArray = defineHelper(`
throw new TypeError("Invalid attempt to destructure non-iterable instance");
}
}
`);
`;
helpers.slicedToArrayLoose = defineHelper(`
helpers.slicedToArrayLoose = () => template.program.ast`
export default function _slicedToArrayLoose(arr, i) {
if (Array.isArray(arr)) {
return arr;
@@ -686,26 +682,26 @@ helpers.slicedToArrayLoose = defineHelper(`
throw new TypeError("Invalid attempt to destructure non-iterable instance");
}
}
`);
`;
helpers.taggedTemplateLiteral = defineHelper(`
helpers.taggedTemplateLiteral = () => template.program.ast`
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 = defineHelper(`
helpers.taggedTemplateLiteralLoose = () => template.program.ast`
export default function _taggedTemplateLiteralLoose(strings, raw) {
if (!raw) { raw = strings.slice(0); }
strings.raw = raw;
return strings;
}
`);
`;
helpers.temporalRef = defineHelper(`
helpers.temporalRef = () => template.program.ast`
import undef from "temporalUndefined";
export default function _temporalRef(val, name) {
@@ -715,31 +711,31 @@ helpers.temporalRef = defineHelper(`
return val;
}
}
`);
`;
helpers.readOnlyError = defineHelper(`
helpers.readOnlyError = () => template.program.ast`
export default function _readOnlyError(name) {
throw new Error("\\"" + name + "\\" is read-only");
}
`);
`;
helpers.classNameTDZError = defineHelper(`
helpers.classNameTDZError = () => template.program.ast`
export default function _classNameTDZError(name) {
throw new Error("Class \\"" + name + "\\" cannot be referenced in computed property keys.");
}
`);
`;
helpers.temporalUndefined = defineHelper(`
helpers.temporalUndefined = () => template.program.ast`
export default {};
`);
`;
helpers.toArray = defineHelper(`
helpers.toArray = () => template.program.ast`
export default function _toArray(arr) {
return Array.isArray(arr) ? arr : Array.from(arr);
}
`);
`;
helpers.toConsumableArray = defineHelper(`
helpers.toConsumableArray = () => template.program.ast`
export default function _toConsumableArray(arr) {
if (Array.isArray(arr)) {
for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) arr2[i] = arr[i];
@@ -748,9 +744,9 @@ helpers.toConsumableArray = defineHelper(`
return Array.from(arr);
}
}
`);
`;
helpers.skipFirstGeneratorNext = defineHelper(`
helpers.skipFirstGeneratorNext = () => template.program.ast`
export default function _skipFirstGeneratorNext(fn) {
return function () {
var it = fn.apply(this, arguments);
@@ -758,9 +754,9 @@ helpers.skipFirstGeneratorNext = defineHelper(`
return it;
}
}
`);
`;
helpers.toPropertyKey = defineHelper(`
helpers.toPropertyKey = () => template.program.ast`
export default function _toPropertyKey(key) {
if (typeof key === "symbol") {
return key;
@@ -768,13 +764,13 @@ helpers.toPropertyKey = defineHelper(`
return 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 = defineHelper(`
helpers.initializerWarningHelper = () => template.program.ast`
export default function _initializerWarningHelper(descriptor, context){
throw new Error(
'Decorating class property failed. Please ensure that ' +
@@ -783,12 +779,12 @@ helpers.initializerWarningHelper = defineHelper(`
'the next major version of decorators in stage 2.'
);
}
`);
`;
/**
* Add a helper to call as a replacement for class property definition.
*/
helpers.initializerDefineProperty = defineHelper(`
helpers.initializerDefineProperty = () => template.program.ast`
export default function _initializerDefineProperty(target, property, descriptor, context){
if (!descriptor) return;
@@ -799,13 +795,13 @@ helpers.initializerDefineProperty = defineHelper(`
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 = defineHelper(`
helpers.applyDecoratedDescriptor = () => template.program.ast`
export default function _applyDecoratedDescriptor(target, property, decorators, descriptor, context){
var desc = {};
Object['ke' + 'ys'](descriptor).forEach(function(key){
@@ -835,4 +831,4 @@ helpers.applyDecoratedDescriptor = defineHelper(`
return desc;
}
`);
`;