将下面reflect-metadata源码改成好理解的代码，并且在文件上方屏蔽eslint校验：let Reflect;
(function (Reflect) {
// Metadata Proposal
// https://rbuckton.github.io/reflect-metadata/
(function (factory) {
let root = typeof globalThis === 'object' ? globalThis :
typeof global === 'object' ? global :
typeof self === 'object' ? self :
typeof this === 'object' ? this :
sloppyModeThis();
let exporter = makeExporter(Reflect);
if (typeof root.Reflect !== 'undefined') {
exporter = makeExporter(root.Reflect, exporter);
}
factory(exporter, root);
if (typeof root.Reflect === 'undefined') {
root.Reflect = Reflect;
}
function makeExporter(target, previous) {
return function (key, value) {
Object.defineProperty(target, key, { configurable: true, writable: true, value });
if (previous) {
previous(key, value);
}
};
}
function functionThis() {
try {
return Function('return this;')();
} catch (_) { }
}
function indirectEvalThis() {
try {
return (void 0, eval)('(function() { return this; })()');
} catch (_) { }
}
function sloppyModeThis() {
return functionThis() || indirectEvalThis();
}
})((exporter, root) => {
let hasOwn = Object.prototype.hasOwnProperty;
// feature test for Symbol support
let supportsSymbol = typeof Symbol === 'function';
let toPrimitiveSymbol = supportsSymbol && typeof Symbol.toPrimitive !== 'undefined' ? Symbol.toPrimitive : '@@toPrimitive';
let iteratorSymbol = supportsSymbol && typeof Symbol.iterator !== 'undefined' ? Symbol.iterator : '@@iterator';
let supportsCreate = typeof Object.create === 'function'; // feature test for Object.create support
let supportsProto = { __proto__: [] } instanceof Array; // feature test for __proto__ support
let downLevel = !supportsCreate && !supportsProto;
let HashMap = {
// create an object in dictionary mode (a.k.a. "slow" mode in v8)
create: supportsCreate ?
function () {
return MakeDictionary(Object.create(null));
} :
supportsProto ?
function () {
return MakeDictionary({ __proto__: null });
} :
function () {
return MakeDictionary({});
},
has: downLevel ?
function (map, key) {
return hasOwn.call(map, key);
} :
function (map, key) {
return key in map;
},
get: downLevel ?
function (map, key) {
return hasOwn.call(map, key) ? map[key] : undefined;
} :
function (map, key) {
return map[key];
},
};
// Load global or shim versions of Map, Set, and WeakMap
let functionPrototype = Object.getPrototypeOf(Function);
let _Map = typeof Map === 'function' && typeof Map.prototype.entries === 'function' ? Map : CreateMapPolyfill();
let _Set = typeof Set === 'function' && typeof Set.prototype.entries === 'function' ? Set : CreateSetPolyfill();
let _WeakMap = typeof WeakMap === 'function' ? WeakMap : CreateWeakMapPolyfill();
let registrySymbol = supportsSymbol ? Symbol.for('@reflect-metadata:registry') : undefined;
let metadataRegistry = GetOrCreateMetadataRegistry();
let metadataProvider = CreateMetadataProvider(metadataRegistry);
/**
* Applies a set of decorators to a property of a target object.
* @param decorators An array of decorators.
* @param target The target object.
* @param propertyKey (Optional) The property key to decorate.
* @param attributes (Optional) The property descriptor for the target key.
* @remarks Decorators are applied in reverse order.
* @example
*
* class Example {
* // property declarations are not part of ES6, though they are valid in TypeScript:
* // static staticProperty;
* // property;
*
* constructor(p) { }
* static staticMethod(p) { }
* method(p) { }
* }
*
* // constructor
* Example = Reflect.decorate(decoratorsArray, Example);
*
* // property (on constructor)
* Reflect.decorate(decoratorsArray, Example, "staticProperty");
*
* // property (on prototype)
* Reflect.decorate(decoratorsArray, Example.prototype, "property");
*
* // method (on constructor)
* Object.defineProperty(Example, "staticMethod",
* Reflect.decorate(decoratorsArray, Example, "staticMethod",
* Object.getOwnPropertyDescriptor(Example, "staticMethod")));
*
* // method (on prototype)
* Object.defineProperty(Example.prototype, "method",
* Reflect.decorate(decoratorsArray, Example.prototype, "method",
* Object.getOwnPropertyDescriptor(Example.prototype, "method")));
*
*/
function decorate(decorators, target, propertyKey, attributes) {
if (!IsUndefined(propertyKey)) {
if (!IsArray(decorators)) {
throw new TypeError();
}
if (!IsObject(target)) {
throw new TypeError();
}
if (!IsObject(attributes) && !IsUndefined(attributes) && !IsNull(attributes)) {
throw new TypeError();
}
if (IsNull(attributes)) {
attributes = undefined;
}
propertyKey = ToPropertyKey(propertyKey);
return DecorateProperty(decorators, target, propertyKey, attributes);
} else {
if (!IsArray(decorators)) {
throw new TypeError();
}
if (!IsConstructor(target)) {
throw new TypeError();
}
return DecorateConstructor(decorators, target);
}
}
exporter('decorate', decorate);
// 4.1.2 Reflect.metadata(metadataKey, metadataValue)
// https://rbuckton.github.io/reflect-metadata/#reflect.metadata
/**
* A default metadata decorator factory that can be used on a class, class member, or parameter.
* @param metadataKey The key for the metadata entry.
* @param metadataValue The value for the metadata entry.
* @returns A decorator function.
* @remarks
* If `metadataKey` is already defined for the target and target key, the
* metadataValue for that key will be overwritten.
* @example
*
* // constructor
* @Reflect.metadata(key, value)
* class Example {
* }
*
* // property (on constructor, TypeScript only)
* class Example {
* @Reflect.metadata(key, value)
* static staticProperty;
* }
*
* // property (on prototype, TypeScript only)
* class Example {
* @Reflect.metadata(key, value)
* property;
* }
*
* // method (on constructor)
* class Example {
* @Reflect.metadata(key, value)
* static staticMethod() { }
* }
*
* // method (on prototype)
* class Example {
* @Reflect.metadata(key, value)
* method() { }
* }
*
*/
function metadata(metadataKey, metadataValue) {
function decorator(target, propertyKey) {
if (!IsObject(target)) {
throw new TypeError();
}
if (!IsUndefined(propertyKey) && !IsPropertyKey(propertyKey)) {
throw new TypeError();
}
OrdinaryDefineOwnMetadata(metadataKey, metadataValue, target, propertyKey);
}
return decorator;
}
exporter('metadata', metadata);
/**
* Define a unique metadata entry on the target.
* @param metadataKey A key used to store and retrieve metadata.
* @param metadataValue A value that contains attached metadata.
* @param target The target object on which to define metadata.
* @param propertyKey (Optional) The property key for the target.
* @example
*
* class Example {
* // property declarations are not part of ES6, though they are valid in TypeScript:
* // static staticProperty;
* // property;
*
* constructor(p) { }
* static staticMethod(p) { }
* method(p) { }
* }
*
* // constructor
* Reflect.defineMetadata("custom:annotation", options, Example);
*
* // property (on constructor)
* Reflect.defineMetadata("custom:annotation", options, Example, "staticProperty");
*
* // property (on prototype)
* Reflect.defineMetadata("custom:annotation", options, Example.prototype, "property");
*
* // method (on constructor)
* Reflect.defineMetadata("custom:annotation", options, Example, "staticMethod");
*
* // method (on prototype)
* Reflect.defineMetadata("custom:annotation", options, Example.prototype, "method");
*
* // decorator factory as metadata-producing annotation.
* function MyAnnotation(options): Decorator {
* return (target, key?) => Reflect.defineMetadata("custom:annotation", options, target, key);
* }
*
*/
function defineMetadata(metadataKey, metadataValue, target, propertyKey) {
if (!IsObject(target)) {
throw new TypeError();
}
if (!IsUndefined(propertyKey)) {
propertyKey = ToPropertyKey(propertyKey);
}
return OrdinaryDefineOwnMetadata(metadataKey, metadataValue, target, propertyKey);
}
exporter('defineMetadata', defineMetadata);
/**
* Gets a value indicating whether the target object or its prototype chain has the provided metadata key defined.
* @param metadataKey A key used to store and retrieve metadata.
* @param target The target object on which the metadata is defined.
* @param propertyKey (Optional) The property key for the target.
* @returns `true` if the metadata key was defined on the target object or its prototype chain; otherwise, `false`.
* @example
*
* class Example {
* // property declarations are not part of ES6, though they are valid in TypeScript:
* // static staticProperty;
* // property;
*
* constructor(p) { }
* static staticMethod(p) { }
* method(p) { }
* }
*
* // constructor
* result = Reflect.hasMetadata("custom:annotation", Example);
*
* // property (on constructor)
* result = Reflect.hasMetadata("custom:annotation", Example, "staticProperty");
*
* // property (on prototype)
* result = Reflect.hasMetadata("custom:annotation", Example.prototype, "property");
*
* // method (on constructor)
* result = Reflect.hasMetadata("custom:annotation", Example, "staticMethod");
*
* // method (on prototype)
* result = Reflect.hasMetadata("custom:annotation", Example.prototype, "method");
*
*/
function hasMetadata(metadataKey, target, propertyKey) {
if (!IsObject(target)) {
throw new TypeError();
}
if (!IsUndefined(propertyKey)) {
propertyKey = ToPropertyKey(propertyKey);
}
return OrdinaryHasMetadata(metadataKey, target, propertyKey);
}
exporter('hasMetadata', hasMetadata);
/**
* Gets a value indicating whether the target object has the provided metadata key defined.
* @param metadataKey A key used to store and retrieve metadata.
* @param target The target object on which the metadata is defined.
* @param propertyKey (Optional) The property key for the target.
* @returns `true` if the metadata key was defined on the target object; otherwise, `false`.
* @example
*
* class Example {
* // property declarations are not part of ES6, though they are valid in TypeScript:
* // static staticProperty;
* // property;
*
* constructor(p) { }
* static staticMethod(p) { }
* method(p) { }
* }
*
* // constructor
* result = Reflect.hasOwnMetadata("custom:annotation", Example);
*
* // property (on constructor)
* result = Reflect.hasOwnMetadata("custom:annotation", Example, "staticProperty");
*
* // property (on prototype)
* result = Reflect.hasOwnMetadata("custom:annotation", Example.prototype, "property");
*
* // method (on constructor)
* result = Reflect.hasOwnMetadata("custom:annotation", Example, "staticMethod");
*
* // method (on prototype)
* result = Reflect.hasOwnMetadata("custom:annotation", Example.prototype, "method");
*
*/
function hasOwnMetadata(metadataKey, target, propertyKey) {
if (!IsObject(target)) {
throw new TypeError();
}
if (!IsUndefined(propertyKey)) {
propertyKey = ToPropertyKey(propertyKey);
}
return OrdinaryHasOwnMetadata(metadataKey, target, propertyKey);
}
exporter('hasOwnMetadata', hasOwnMetadata);
/**
* Gets the metadata value for the provided metadata key on the target object or its prototype chain.
* @param metadataKey A key used to store and retrieve metadata.
* @param target The target object on which the metadata is defined.
* @param propertyKey (Optional) The property key for the target.
* @returns The metadata value for the metadata key if found; otherwise, `undefined`.
* @example
*
* class Example {
* // property declarations are not part of ES6, though they are valid in TypeScript:
* // static staticProperty;
* // property;
*
* constructor(p) { }
* static staticMethod(p) { }
* method(p) { }
* }
*
* // constructor
* result = Reflect.getMetadata("custom:annotation", Example);
*
* // property (on constructor)
* result = Reflect.getMetadata("custom:annotation", Example, "staticProperty");
*
* // property (on prototype)
* result = Reflect.getMetadata("custom:annotation", Example.prototype, "property");
*
* // method (on constructor)
* result = Reflect.getMetadata("custom:annotation", Example, "staticMethod");
*
* // method (on prototype)
* result = Reflect.getMetadata("custom:annotation", Example.prototype, "method");
*
*/
function getMetadata(metadataKey, target, propertyKey) {
if (!IsObject(target)) {
throw new TypeError();
}
if (!IsUndefined(propertyKey)) {
propertyKey = ToPropertyKey(propertyKey);
}
return OrdinaryGetMetadata(metadataKey, target, propertyKey);
}
exporter('getMetadata', getMetadata);
/**
* Gets the metadata value for the provided metadata key on the target object.
* @param metadataKey A key used to store and retrieve metadata.
* @param target The target object on which the metadata is defined.
* @param propertyKey (Optional) The property key for the target.
* @returns The metadata value for the metadata key if found; otherwise, `undefined`.
* @example
*
* class Example {
* // property declarations are not part of ES6, though they are valid in TypeScript:
* // static staticProperty;
* // property;
*
* constructor(p) { }
* static staticMethod(p) { }
* method(p) { }
* }
*
* // constructor
* result = Reflect.getOwnMetadata("custom:annotation", Example);
*
* // property (on constructor)
* result = Reflect.getOwnMetadata("custom:annotation", Example, "staticProperty");
*
* // property (on prototype)
* result = Reflect.getOwnMetadata("custom:annotation", Example.prototype, "property");
*
* // method (on constructor)
* result = Reflect.getOwnMetadata("custom:annotation", Example, "staticMethod");
*
* // method (on prototype)
* result = Reflect.getOwnMetadata("custom:annotation", Example.prototype, "method");
*
*/
function getOwnMetadata(metadataKey, target, propertyKey) {
if (!IsObject(target)) {
throw new TypeError();
}
if (!IsUndefined(propertyKey)) {
propertyKey = ToPropertyKey(propertyKey);
}
return OrdinaryGetOwnMetadata(metadataKey, target, propertyKey);
}
exporter('getOwnMetadata', getOwnMetadata);
/**
* Gets the metadata keys defined on the target object or its prototype chain.
* @param target The target object on which the metadata is defined.
* @param propertyKey (Optional) The property key for the target.
* @returns An array of unique metadata keys.
* @example
*
* class Example {
* // property declarations are not part of ES6, though they are valid in TypeScript:
* // static staticProperty;
* // property;
*
* constructor(p) { }
* static staticMethod(p) { }
* method(p) { }
* }
*
* // constructor
* result = Reflect.getMetadataKeys(Example);
*
* // property (on constructor)
* result = Reflect.getMetadataKeys(Example, "staticProperty");
*
* // property (on prototype)
* result = Reflect.getMetadataKeys(Example.prototype, "property");
*
* // method (on constructor)
* result = Reflect.getMetadataKeys(Example, "staticMethod");
*
* // method (on prototype)
* result = Reflect.getMetadataKeys(Example.prototype, "method");
*
*/
function getMetadataKeys(target, propertyKey) {
if (!IsObject(target)) {
throw new TypeError();
}
if (!IsUndefined(propertyKey)) {
propertyKey = ToPropertyKey(propertyKey);
}
return OrdinaryMetadataKeys(target, propertyKey);
}
exporter('getMetadataKeys', getMetadataKeys);
/**
* Gets the unique metadata keys defined on the target object.
* @param target The target object on which the metadata is defined.
* @param propertyKey (Optional) The property key for the target.
* @returns An array of unique metadata keys.
* @example
*
* class Example {
* // property declarations are not part of ES6, though they are valid in TypeScript:
* // static staticProperty;
* // property;
*
* constructor(p) { }
* static staticMethod(p) { }
* method(p) { }
* }
*
* // constructor
* result = Reflect.getOwnMetadataKeys(Example);
*
* // property (on constructor)
* result = Reflect.getOwnMetadataKeys(Example, "staticProperty");
*
* // property (on prototype)
* result = Reflect.getOwnMetadataKeys(Example.prototype, "property");
*
* // method (on constructor)
* result = Reflect.getOwnMetadataKeys(Example, "staticMethod");
*
* // method (on prototype)
* result = Reflect.getOwnMetadataKeys(Example.prototype, "method");
*
*/
function getOwnMetadataKeys(target, propertyKey) {
if (!IsObject(target)) {
throw new TypeError();
}
if (!IsUndefined(propertyKey)) {
propertyKey = ToPropertyKey(propertyKey);
}
return OrdinaryOwnMetadataKeys(target, propertyKey);
}
exporter('getOwnMetadataKeys', getOwnMetadataKeys);
/**
* Deletes the metadata entry from the target object with the provided key.
* @param metadataKey A key used to store and retrieve metadata.
* @param target The target object on which the metadata is defined.
* @param propertyKey (Optional) The property key for the target.
* @returns `true` if the metadata entry was found and deleted; otherwise, false.
* @example
*
* class Example {
* // property declarations are not part of ES6, though they are valid in TypeScript:
* // static staticProperty;
* // property;
*
* constructor(p) { }
* static staticMethod(p) { }
* method(p) { }
* }
*
* // constructor
* result = Reflect.deleteMetadata("custom:annotation", Example);
*
* // property (on constructor)
* result = Reflect.deleteMetadata("custom:annotation", Example, "staticProperty");
*
* // property (on prototype)
* result = Reflect.deleteMetadata("custom:annotation", Example.prototype, "property");
*
* // method (on constructor)
* result = Reflect.deleteMetadata("custom:annotation", Example, "staticMethod");
*
* // method (on prototype)
* result = Reflect.deleteMetadata("custom:annotation", Example.prototype, "method");
*
*/
function deleteMetadata(metadataKey, target, propertyKey) {
if (!IsObject(target)) {
throw new TypeError();
}
if (!IsUndefined(propertyKey)) {
propertyKey = ToPropertyKey(propertyKey);
}
if (!IsObject(target)) {
throw new TypeError();
}
if (!IsUndefined(propertyKey)) {
propertyKey = ToPropertyKey(propertyKey);
}
let provider = GetMetadataProvider(target, propertyKey, /* Create*/ false);
if (IsUndefined(provider)) {
return false;
}
return provider.OrdinaryDeleteMetadata(metadataKey, target, propertyKey);
}
exporter('deleteMetadata', deleteMetadata);
function DecorateConstructor(decorators, target) {
for (let i = decorators.length - 1; i >= 0; --i) {
let decorator = decorators[i];
let decorated = decorator(target);
if (!IsUndefined(decorated) && !IsNull(decorated)) {
if (!IsConstructor(decorated)) {
throw new TypeError();
}
target = decorated;
}
}
return target;
}
function DecorateProperty(decorators, target, propertyKey, descriptor) {
for (let i = decorators.length - 1; i >= 0; --i) {
let decorator = decorators[i];
let decorated = decorator(target, propertyKey, descriptor);
if (!IsUndefined(decorated) && !IsNull(decorated)) {
if (!IsObject(decorated)) {
throw new TypeError();
}
descriptor = decorated;
}
}
return descriptor;
}
// 3.1.1.1 OrdinaryHasMetadata(MetadataKey, O, P)
// https://rbuckton.github.io/reflect-metadata/#ordinaryhasmetadata
function OrdinaryHasMetadata(MetadataKey, O, P) {
let hasOwn = OrdinaryHasOwnMetadata(MetadataKey, O, P);
if (hasOwn) {
return true;
}
let parent = OrdinaryGetPrototypeOf(O);
if (!IsNull(parent)) {
return OrdinaryHasMetadata(MetadataKey, parent, P);
}
return false;
}
// 3.1.2.1 OrdinaryHasOwnMetadata(MetadataKey, O, P)
// https://rbuckton.github.io/reflect-metadata/#ordinaryhasownmetadata
function OrdinaryHasOwnMetadata(MetadataKey, O, P) {
let provider = GetMetadataProvider(O, P, /* Create*/ false);
if (IsUndefined(provider)) {
return false;
}
return ToBoolean(provider.OrdinaryHasOwnMetadata(MetadataKey, O, P));
}
// 3.1.3.1 OrdinaryGetMetadata(MetadataKey, O, P)
// https://rbuckton.github.io/reflect-metadata/#ordinarygetmetadata
function OrdinaryGetMetadata(MetadataKey, O, P) {
let hasOwn = OrdinaryHasOwnMetadata(MetadataKey, O, P);
if (hasOwn) {
return OrdinaryGetOwnMetadata(MetadataKey, O, P);
}
let parent = OrdinaryGetPrototypeOf(O);
if (!IsNull(parent)) {
return OrdinaryGetMetadata(MetadataKey, parent, P);
}
return undefined;
}
// 3.1.4.1 OrdinaryGetOwnMetadata(MetadataKey, O, P)
// https://rbuckton.github.io/reflect-metadata/#ordinarygetownmetadata
function OrdinaryGetOwnMetadata(MetadataKey, O, P) {
let provider = GetMetadataProvider(O, P, /* Create*/ false);
if (IsUndefined(provider)) {
return;
}
return provider.OrdinaryGetOwnMetadata(MetadataKey, O, P);
}
// 3.1.5.1 OrdinaryDefineOwnMetadata(MetadataKey, MetadataValue, O, P)
// https://rbuckton.github.io/reflect-metadata/#ordinarydefineownmetadata
function OrdinaryDefineOwnMetadata(MetadataKey, MetadataValue, O, P) {
let provider = GetMetadataProvider(O, P, /* Create*/ true);
provider.OrdinaryDefineOwnMetadata(MetadataKey, MetadataValue, O, P);
}
// 3.1.6.1 OrdinaryMetadataKeys(O, P)
// https://rbuckton.github.io/reflect-metadata/#ordinarymetadatakeys
function OrdinaryMetadataKeys(O, P) {
let ownKeys = OrdinaryOwnMetadataKeys(O, P);
let parent = OrdinaryGetPrototypeOf(O);
if (parent === null) {
return ownKeys;
}
let parentKeys = OrdinaryMetadataKeys(parent, P);
if (parentKeys.length <= 0) {
return ownKeys;
}
if (ownKeys.length <= 0) {
return parentKeys;
}
let set = new _Set();
let keys = [];
for (let _i = 0, ownKeys_1 = ownKeys; _i < ownKeys_1.length; _i++) {
var key = ownKeys_1[_i];
var hasKey = set.has(key);
if (!hasKey) {
set.add(key);
keys.push(key);
}
}
for (let _a = 0, parentKeys_1 = parentKeys; _a < parentKeys_1.length; _a++) {
var key = parentKeys_1[_a];
var hasKey = set.has(key);
if (!hasKey) {
set.add(key);
keys.push(key);
}
}
return keys;
}
// 3.1.7.1 OrdinaryOwnMetadataKeys(O, P)
// https://rbuckton.github.io/reflect-metadata/#ordinaryownmetadatakeys
function OrdinaryOwnMetadataKeys(O, P) {
let provider = GetMetadataProvider(O, P, /* create*/ false);
if (!provider) {
return [];
}
return provider.OrdinaryOwnMetadataKeys(O, P);
}
// 6 ECMAScript Data Types and Values
// https://tc39.github.io/ecma262/#sec-ecmascript-data-types-and-values
function Type(x) {
if (x === null) {
return 1 /* Null */;
}
switch (typeof x) {
case 'undefined': return 0 /* Undefined */;
case 'boolean': return 2 /* Boolean */;
case 'string': return 3 /* String */;
case 'symbol': return 4 /* Symbol */;
case 'number': return 5 /* Number */;
case 'object': return x === null ? 1 /* Null */ : 6 /* Object */;
default: return 6 /* Object */;
}
}
// 6.1.1 The Undefined Type
// https://tc39.github.io/ecma262/#sec-ecmascript-language-types-undefined-type
function IsUndefined(x) {
return x === undefined;
}
// 6.1.2 The Null Type
// https://tc39.github.io/ecma262/#sec-ecmascript-language-types-null-type
function IsNull(x) {
return x === null;
}
// 6.1.5 The Symbol Type
// https://tc39.github.io/ecma262/#sec-ecmascript-language-types-symbol-type
function IsSymbol(x) {
return typeof x === 'symbol';
}
// 6.1.7 The Object Type
// https://tc39.github.io/ecma262/#sec-object-type
function IsObject(x) {
return typeof x === 'object' ? x !== null : typeof x === 'function';
}
// 7.1 Type Conversion
// https://tc39.github.io/ecma262/#sec-type-conversion
// 7.1.1 ToPrimitive(input [, PreferredType])
// https://tc39.github.io/ecma262/#sec-toprimitive
function ToPrimitive(input, PreferredType) {
switch (Type(input)) {
case 0 /* Undefined */: return input;
case 1 /* Null */: return input;
case 2 /* Boolean */: return input;
case 3 /* String */: return input;
case 4 /* Symbol */: return input;
case 5 /* Number */: return input;
}
let hint = PreferredType === 3 /* String */ ? 'string' : PreferredType === 5 /* Number */ ? 'number' : 'default';
let exoticToPrim = GetMethod(input, toPrimitiveSymbol);
if (exoticToPrim !== undefined) {
let result = exoticToPrim.call(input, hint);
if (IsObject(result)) {
throw new TypeError();
}
return result;
}
return OrdinaryToPrimitive(input, hint === 'default' ? 'number' : hint);
}
// 7.1.1.1 OrdinaryToPrimitive(O, hint)
// https://tc39.github.io/ecma262/#sec-ordinarytoprimitive
function OrdinaryToPrimitive(O, hint) {
if (hint === 'string') {
let toString_1 = O.toString;
if (IsCallable(toString_1)) {
var result = toString_1.call(O);
if (!IsObject(result)) {
return result;
}
}
var { valueOf } = O;
if (IsCallable(valueOf)) {
var result = valueOf.call(O);
if (!IsObject(result)) {
return result;
}
}
} else {
var { valueOf } = O;
if (IsCallable(valueOf)) {
var result = valueOf.call(O);
if (!IsObject(result)) {
return result;
}
}
let toString_2 = O.toString;
if (IsCallable(toString_2)) {
var result = toString_2.call(O);
if (!IsObject(result)) {
return result;
}
}
}
throw new TypeError();
}
// 7.1.2 ToBoolean(argument)
// https://tc39.github.io/ecma262/2016/#sec-toboolean
function ToBoolean(argument) {
return Boolean(argument);
}
// 7.1.12 ToString(argument)
// https://tc39.github.io/ecma262/#sec-tostring
function ToString(argument) {
return `${argument}`;
}
// 7.1.14 ToPropertyKey(argument)
// https://tc39.github.io/ecma262/#sec-topropertykey
function ToPropertyKey(argument) {
let key = ToPrimitive(argument, 3 /* String */);
if (IsSymbol(key)) {
return key;
}
return ToString(key);
}
// 7.2 Testing and Comparison Operations
// https://tc39.github.io/ecma262/#sec-testing-and-comparison-operations
// 7.2.2 IsArray(argument)
// https://tc39.github.io/ecma262/#sec-isarray
function IsArray(argument) {
return Array.isArray ?
Array.isArray(argument) :
argument instanceof Object ?
argument instanceof Array :
Object.prototype.toString.call(argument) === '[object Array]';
}
// 7.2.3 IsCallable(argument)
// https://tc39.github.io/ecma262/#sec-iscallable
function IsCallable(argument) {
// NOTE: This is an approximation as we cannot check for [[Call]] internal method.
return typeof argument === 'function';
}
// 7.2.4 IsConstructor(argument)
// https://tc39.github.io/ecma262/#sec-isconstructor
function IsConstructor(argument) {
// NOTE: This is an approximation as we cannot check for [[Construct]] internal method.
return typeof argument === 'function';
}
// 7.2.7 IsPropertyKey(argument)
// https://tc39.github.io/ecma262/#sec-ispropertykey
function IsPropertyKey(argument) {
switch (Type(argument)) {
case 3 /* String */: return true;
case 4 /* Symbol */: return true;
default: return false;
}
}
function SameValueZero(x, y) {
return x === y || x !== x && y !== y;
}
// 7.3 Operations on Objects
// https://tc39.github.io/ecma262/#sec-operations-on-objects
// 7.3.9 GetMethod(V, P)
// https://tc39.github.io/ecma262/#sec-getmethod
function GetMethod(V, P) {
let func = V[P];
if (func === undefined || func === null) {
return undefined;
}
if (!IsCallable(func)) {
throw new TypeError();
}
return func;
}
// 7.4 Operations on Iterator Objects
// https://tc39.github.io/ecma262/#sec-operations-on-iterator-objects
function GetIterator(obj) {
let method = GetMethod(obj, iteratorSymbol);
if (!IsCallable(method)) {
throw new TypeError();
} // from Call
let iterator = method.call(obj);
if (!IsObject(iterator)) {
throw new TypeError();
}
return iterator;
}
// 7.4.4 IteratorValue(iterResult)
// https://tc39.github.io/ecma262/2016/#sec-iteratorvalue
function IteratorValue(iterResult) {
return iterResult.value;
}
// 7.4.5 IteratorStep(iterator)
// https://tc39.github.io/ecma262/#sec-iteratorstep
function IteratorStep(iterator) {
let result = iterator.next();
return result.done ? false : result;
}
// 7.4.6 IteratorClose(iterator, completion)
// https://tc39.github.io/ecma262/#sec-iteratorclose
function IteratorClose(iterator) {
let f = iterator.return;
if (f) {
f.call(iterator);
}
}
// 9.1 Ordinary Object Internal Methods and Internal Slots
// https://tc39.github.io/ecma262/#sec-ordinary-object-internal-methods-and-internal-slots
// 9.1.1.1 OrdinaryGetPrototypeOf(O)
// https://tc39.github.io/ecma262/#sec-ordinarygetprototypeof
function OrdinaryGetPrototypeOf(O) {
let proto = Object.getPrototypeOf(O);
if (typeof O !== 'function' || O === functionPrototype) {
return proto;
}
// TypeScript doesn't set __proto__ in ES5, as it's non-standard.
// Try to determine the superclass constructor. Compatible implementations
// must either set __proto__ on a subclass constructor to the superclass constructor,
// or ensure each class has a valid `constructor` property on its prototype that
// points back to the constructor.
// If this is not the same as Function.[[Prototype]], then this is definately inherited.
// This is the case when in ES6 or when using __proto__ in a compatible browser.
if (proto !== functionPrototype) {
return proto;
}
// If the super prototype is Object.prototype, null, or undefined, then we cannot determine the heritage.
let { prototype } = O;
let prototypeProto = prototype && Object.getPrototypeOf(prototype);
if (prototypeProto == null || prototypeProto === Object.prototype) {
return proto;
}
// If the constructor was not a function, then we cannot determine the heritage.
let { constructor } = prototypeProto;
if (typeof constructor !== 'function') {
return proto;
}
// If we have some kind of self-reference, then we cannot determine the heritage.
if (constructor === O) {
return proto;
}
// we have a pretty good guess at the heritage.
return constructor;
}
// Global metadata registry
// - Allows `import "reflect-metadata"` and `import "reflect-metadata/no-conflict"` to interoperate.
// - Uses isolated metadata if `Reflect` is frozen before the registry can be installed.
/**
* Creates a registry used to allow multiple `reflect-metadata` providers.
*/
function CreateMetadataRegistry() {
let fallback;
if (!IsUndefined(registrySymbol) &&
typeof root.Reflect !== 'undefined' &&
!(registrySymbol in root.Reflect) &&
typeof root.Reflect.defineMetadata === 'function') {
// interoperate with older version of `reflect-metadata` that did not support a registry.
fallback = CreateFallbackProvider(root.Reflect);
}
let first;
let second;
let rest;
let targetProviderMap = new _WeakMap();
let registry = {
registerProvider,
getProvider,
setProvider,
};
return registry;
function registerProvider(provider) {
if (!Object.isExtensible(registry)) {
throw new Error('Cannot add provider to a frozen registry.');
}
switch (true) {
case fallback === provider: break;
case IsUndefined(first):
first = provider;
break;
case first === provider: break;
case IsUndefined(second):
second = provider;
break;
case second === provider: break;
default:
if (rest === undefined) {
rest = new _Set();
}
rest.add(provider);
break;
}
}
function getProviderNoCache(O, P) {
if (!IsUndefined(first)) {
if (first.isProviderFor(O, P)) {
return first;
}
if (!IsUndefined(second)) {
if (second.isProviderFor(O, P)) {
return first;
}
if (!IsUndefined(rest)) {
let iterator = GetIterator(rest);
while (true) {
let next = IteratorStep(iterator);
if (!next) {
return undefined;
}
let provider = IteratorValue(next);
if (provider.isProviderFor(O, P)) {
IteratorClose(iterator);
return provider;
}
}
}
}
}
if (!IsUndefined(fallback) && fallback.isProviderFor(O, P)) {
return fallback;
}
return undefined;
}
function getProvider(O, P) {
let providerMap = targetProviderMap.get(O);
let provider;
if (!IsUndefined(providerMap)) {
provider = providerMap.get(P);
}
if (!IsUndefined(provider)) {
return provider;
}
provider = getProviderNoCache(O, P);
if (!IsUndefined(provider)) {
if (IsUndefined(providerMap)) {
providerMap = new _Map();
targetProviderMap.set(O, providerMap);
}
providerMap.set(P, provider);
}
return provider;
}
function hasProvider(provider) {
if (IsUndefined(provider)) {
throw new TypeError();
}
return first === provider || second === provider || !IsUndefined(rest) && rest.has(provider);
}
function setProvider(O, P, provider) {
if (!hasProvider(provider)) {
throw new Error('Metadata provider not registered.');
}
let existingProvider = getProvider(O, P);
if (existingProvider !== provider) {
if (!IsUndefined(existingProvider)) {
return false;
}
let providerMap = targetProviderMap.get(O);
if (IsUndefined(providerMap)) {
providerMap = new _Map();
targetProviderMap.set(O, providerMap);
}
providerMap.set(P, provider);
}
return true;
}
}
/**
* Gets or creates the shared registry of metadata providers.
*/
function GetOrCreateMetadataRegistry() {
let metadataRegistry;
if (!IsUndefined(registrySymbol) && IsObject(root.Reflect) && Object.isExtensible(root.Reflect)) {
metadataRegistry = root.Reflect[registrySymbol];
}
if (IsUndefined(metadataRegistry)) {
metadataRegistry = CreateMetadataRegistry();
}
if (!IsUndefined(registrySymbol) && IsObject(root.Reflect) && Object.isExtensible(root.Reflect)) {
Object.defineProperty(root.Reflect, registrySymbol, {
enumerable: false,
configurable: false,
writable: false,
value: metadataRegistry,
});
}
return metadataRegistry;
}
function CreateMetadataProvider(registry) {
// [[Metadata]] internal slot
// https://rbuckton.github.io/reflect-metadata/#ordinary-object-internal-methods-and-internal-slots
let metadata = new _WeakMap();
let provider = {
isProviderFor (O, P) {
let targetMetadata = metadata.get(O);
if (IsUndefined(targetMetadata)) {
return false;
}
return targetMetadata.has(P);
},
OrdinaryDefineOwnMetadata,
OrdinaryHasOwnMetadata,
OrdinaryGetOwnMetadata,
OrdinaryOwnMetadataKeys,
OrdinaryDeleteMetadata,
};
metadataRegistry.registerProvider(provider);
return provider;
function GetOrCreateMetadataMap(O, P, Create) {
let targetMetadata = metadata.get(O);
let createdTargetMetadata = false;
if (IsUndefined(targetMetadata)) {
if (!Create) {
return undefined;
}
targetMetadata = new _Map();
metadata.set(O, targetMetadata);
createdTargetMetadata = true;
}
let metadataMap = targetMetadata.get(P);
if (IsUndefined(metadataMap)) {
if (!Create) {
return undefined;
}
metadataMap = new _Map();
targetMetadata.set(P, metadataMap);
if (!registry.setProvider(O, P, provider)) {
targetMetadata.delete(P);
if (createdTargetMetadata) {
metadata.delete(O);
}
throw new Error('Wrong provider for target.');
}
}
return metadataMap;
}
// 3.1.2.1 OrdinaryHasOwnMetadata(MetadataKey, O, P)
// https://rbuckton.github.io/reflect-metadata/#ordinaryhasownmetadata
function OrdinaryHasOwnMetadata(MetadataKey, O, P) {
let metadataMap = GetOrCreateMetadataMap(O, P, /* Create*/ false);
if (IsUndefined(metadataMap)) {
return false;
}
return ToBoolean(metadataMap.has(MetadataKey));
}
// 3.1.4.1 OrdinaryGetOwnMetadata(MetadataKey, O, P)
// https://rbuckton.github.io/reflect-metadata/#ordinarygetownmetadata
function OrdinaryGetOwnMetadata(MetadataKey, O, P) {
let metadataMap = GetOrCreateMetadataMap(O, P, /* Create*/ false);
if (IsUndefined(metadataMap)) {
return undefined;
}
return metadataMap.get(MetadataKey);
}
// 3.1.5.1 OrdinaryDefineOwnMetadata(MetadataKey, MetadataValue, O, P)
// https://rbuckton.github.io/reflect-metadata/#ordinarydefineownmetadata
function OrdinaryDefineOwnMetadata(MetadataKey, MetadataValue, O, P) {
let metadataMap = GetOrCreateMetadataMap(O, P, /* Create*/ true);
metadataMap.set(MetadataKey, MetadataValue);
}
// 3.1.7.1 OrdinaryOwnMetadataKeys(O, P)
// https://rbuckton.github.io/reflect-metadata/#ordinaryownmetadatakeys
function OrdinaryOwnMetadataKeys(O, P) {
let keys = [];
let metadataMap = GetOrCreateMetadataMap(O, P, /* Create*/ false);
if (IsUndefined(metadataMap)) {
return keys;
}
let keysObj = metadataMap.keys();
let iterator = GetIterator(keysObj);
let k = 0;
while (true) {
let next = IteratorStep(iterator);
if (!next) {
keys.length = k;
return keys;
}
let nextValue = IteratorValue(next);
try {
keys[k] = nextValue;
} catch (e) {
try {
IteratorClose(iterator);
} finally {
throw e;
}
}
k++;
}
}
function OrdinaryDeleteMetadata(MetadataKey, O, P) {
let metadataMap = GetOrCreateMetadataMap(O, P, /* Create*/ false);
if (IsUndefined(metadataMap)) {
return false;
}
if (!metadataMap.delete(MetadataKey)) {
return false;
}
if (metadataMap.size === 0) {
let targetMetadata = metadata.get(O);
if (!IsUndefined(targetMetadata)) {
targetMetadata.delete(P);
if (targetMetadata.size === 0) {
metadata.delete(targetMetadata);
}
}
}
return true;
}
}
function CreateFallbackProvider(reflect) {
let { defineMetadata } = reflect,
{ hasOwnMetadata } = reflect,
{ getOwnMetadata } = reflect,
{ getOwnMetadataKeys } = reflect,
{ deleteMetadata } = reflect;
let metadataOwner = new _WeakMap();
let provider = {
isProviderFor (O, P) {
let metadataPropertySet = metadataOwner.get(O);
if (!IsUndefined(metadataPropertySet) && metadataPropertySet.has(P)) {
return true;
}
if (getOwnMetadataKeys(O, P).length) {
if (IsUndefined(metadataPropertySet)) {
metadataPropertySet = new _Set();
metadataOwner.set(O, metadataPropertySet);
}
metadataPropertySet.add(P);
return true;
}
return false;
},
OrdinaryDefineOwnMetadata: defineMetadata,
OrdinaryHasOwnMetadata: hasOwnMetadata,
OrdinaryGetOwnMetadata: getOwnMetadata,
OrdinaryOwnMetadataKeys: getOwnMetadataKeys,
OrdinaryDeleteMetadata: deleteMetadata,
};
return provider;
}
/**
* Gets the metadata provider for an object. If the object has no metadata provider and this is for a create operation,
* then this module's metadata provider is assigned to the object.
*/
function GetMetadataProvider(O, P, Create) {
let registeredProvider = metadataRegistry.getProvider(O, P);
if (!IsUndefined(registeredProvider)) {
return registeredProvider;
}
if (Create) {
if (metadataRegistry.setProvider(O, P, metadataProvider)) {
return metadataProvider;
}
throw new Error('Illegal state.');
}
return undefined;
}
// naive Map shim
function CreateMapPolyfill() {
let cacheSentinel = {};
let arraySentinel = [];
let MapIterator = /** @class */ (function () {
function MapIterator(keys, values, selector) {
this._index = 0;
this._keys = keys;
this._values = values;
this._selector = selector;
}
MapIterator.prototype['@@iterator'] = function () {
return this;
};
MapIterator.prototype[iteratorSymbol] = function () {
return this;
};
MapIterator.prototype.next = function () {
let index = this._index;
if (index >= 0 && index < this._keys.length) {
let result = this._selector(this._keys[index], this._values[index]);
if (index + 1 >= this._keys.length) {
this._index = -1;
this._keys = arraySentinel;
this._values = arraySentinel;
} else {
this._index++;
}
return { value: result, done: false };
}
return { value: undefined, done: true };
};
MapIterator.prototype.throw = function (error) {
if (this._index >= 0) {
this._index = -1;
this._keys = arraySentinel;
this._values = arraySentinel;
}
throw error;
};
MapIterator.prototype.return = function (value) {
if (this._index >= 0) {
this._index = -1;
this._keys = arraySentinel;
this._values = arraySentinel;
}
return { value, done: true };
};
return MapIterator;
}());
let Map = /** @class */ (function () {
function Map() {
this._keys = [];
this._values = [];
this._cacheKey = cacheSentinel;
this._cacheIndex = -2;
}
Object.defineProperty(Map.prototype, 'size', {
get () {
return this._keys.length;
},
enumerable: true,
configurable: true,
});
Map.prototype.has = function (key) {
return this._find(key, /* insert*/ false) >= 0;
};
Map.prototype.get = function (key) {
let index = this._find(key, /* insert*/ false);
return index >= 0 ? this._values[index] : undefined;
};
Map.prototype.set = function (key, value) {
let index = this._find(key, /* insert*/ true);
this._values[index] = value;
return this;
};
Map.prototype.delete = function (key) {
let index = this._find(key, /* insert*/ false);
if (index >= 0) {
let size = this._keys.length;
for (let i = index + 1; i < size; i++) {
this._keys[i - 1] = this._keys[i];
this._values[i - 1] = this._values[i];
}
this._keys.length--;
this._values.length--;
if (SameValueZero(key, this._cacheKey)) {
this._cacheKey = cacheSentinel;
this._cacheIndex = -2;
}
return true;
}
return false;
};
Map.prototype.clear = function () {
this._keys.length = 0;
this._values.length = 0;
this._cacheKey = cacheSentinel;
this._cacheIndex = -2;
};
Map.prototype.keys = function () {
return new MapIterator(this._keys, this._values, getKey);
};
Map.prototype.values = function () {
return new MapIterator(this._keys, this._values, getValue);
};
Map.prototype.entries = function () {
return new MapIterator(this._keys, this._values, getEntry);
};
Map.prototype['@@iterator'] = function () {
return this.entries();
};
Map.prototype[iteratorSymbol] = function () {
return this.entries();
};
Map.prototype._find = function (key, insert) {
if (!SameValueZero(this._cacheKey, key)) {
this._cacheIndex = -1;
for (let i = 0; i < this._keys.length; i++) {
if (SameValueZero(this._keys[i], key)) {
this._cacheIndex = i;
break;
}
}
}
if (this._cacheIndex < 0 && insert) {
this._cacheIndex = this._keys.length;
this._keys.push(key);
this._values.push(undefined);
}
return this._cacheIndex;
};
return Map;
}());
return Map;
function getKey(key, _) {
return key;
}
function getValue(_, value) {
return value;
}
function getEntry(key, value) {
return [key, value];
}
}
// naive Set shim
function CreateSetPolyfill() {
let Set = /** @class */ (function () {
function Set() {
this._map = new _Map();
}
Object.defineProperty(Set.prototype, 'size', {
get () {
return this._map.size;
},
enumerable: true,
configurable: true,
});
Set.prototype.has = function (value) {
return this._map.has(value);
};
Set.prototype.add = function (value) {
return this._map.set(value, value), this;
};
Set.prototype.delete = function (value) {
return this._map.delete(value);
};
Set.prototype.clear = function () {
this._map.clear();
};
Set.prototype.keys = function () {
return this._map.keys();
};
Set.prototype.values = function () {
return this._map.keys();
};
Set.prototype.entries = function () {
return this._map.entries();
};
Set.prototype['@@iterator'] = function () {
return this.keys();
};
Set.prototype[iteratorSymbol] = function () {
return this.keys();
};
return Set;
}());
return Set;
}
// naive WeakMap shim
function CreateWeakMapPolyfill() {
let UUID_SIZE = 16;
let keys = HashMap.create();
let rootKey = CreateUniqueKey();
return /** @class */ (function () {
function WeakMap() {
this._key = CreateUniqueKey();
}
WeakMap.prototype.has = function (target) {
let table = GetOrCreateWeakMapTable(target, /* create*/ false);
return table !== undefined ? HashMap.has(table, this._key) : false;
};
WeakMap.prototype.get = function (target) {
let table = GetOrCreateWeakMapTable(target, /* create*/ false);
return table !== undefined ? HashMap.get(table, this._key) : undefined;
};
WeakMap.prototype.set = function (target, value) {
let table = GetOrCreateWeakMapTable(target, /* create*/ true);
table[this._key] = value;
return this;
};
WeakMap.prototype.delete = function (target) {
let table = GetOrCreateWeakMapTable(target, /* create*/ false);
return table !== undefined ? delete table[this._key] : false;
};
WeakMap.prototype.clear = function () {
// NOTE: not a real clear, just makes the previous data unreachable
this._key = CreateUniqueKey();
};
return WeakMap;
}());
function CreateUniqueKey() {
let key;
do {
key = `@@WeakMap@@${CreateUUID()}`;
}
while (HashMap.has(keys, key));
keys[key] = true;
return key;
}
function GetOrCreateWeakMapTable(target, create) {
if (!hasOwn.call(target, rootKey)) {
if (!create) {
return undefined;
}
Object.defineProperty(target, rootKey, { value: HashMap.create() });
}
return target[rootKey];
}
function FillRandomBytes(buffer, size) {
for (let i = 0; i < size; ++i) {
buffer[i] = Math.random() * 0xff | 0;
}
return buffer;
}
function GenRandomBytes(size) {
if (typeof Uint8Array === 'function') {
let array = new Uint8Array(size);
if (typeof crypto !== 'undefined') {
crypto.getRandomValues(array);
} else if (typeof msCrypto !== 'undefined') {
msCrypto.getRandomValues(array);
} else {
FillRandomBytes(array, size);
}
return array;
}
return FillRandomBytes(new Array(size), size);
}
function CreateUUID() {
let data = GenRandomBytes(UUID_SIZE);
// mark as random - RFC 4122 § 4.4
data[6] = data[6] & 0x4f | 0x40;
data[8] = data[8] & 0xbf | 0x80;
let result = '';
for (let offset = 0; offset < UUID_SIZE; ++offset) {
let byte = data[offset];
if (offset === 4 || offset === 6 || offset === 8) {
result += '-';
}
if (byte < 16) {
result += '0';
}
result += byte.toString(16).toLowerCase();
}
return result;
}
}
// uses a heuristic used by v8 and chakra to force an object into dictionary mode.
function MakeDictionary(obj) {
obj.__ = undefined;
delete obj.__;
return obj;
}
});
})(Reflect || (Reflect = {}));
本文详细介绍了JavaScript中四个重要的实用方法：hasOwnProperty()用于检查对象自身属性，Array.isArray()判断值是否为数组，Object.entries()获取对象的键值对数组，以及Reflect.set()用于设置对象属性。每个方法都通过示例进行了解释并提供了MDN的官方参考链接。
扫一扫
1673
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
