Update LKG (microsoft#18774)

Author: Andy

lib/lib.d.ts

@@ -30,9 +30,7 @@ interface Array<T> {
      * @param thisArg If provided, it will be used as the this value for each invocation of
      * predicate. If it is not provided, undefined is used instead.
      */
-    find(predicate: (this: void, value: T, index: number, obj: Array<T>) => boolean): T | undefined;
-    find(predicate: (this: void, value: T, index: number, obj: Array<T>) => boolean, thisArg: undefined): T | undefined;
-    find<Z>(predicate: (this: Z, value: T, index: number, obj: Array<T>) => boolean, thisArg: Z): T | undefined;
+    find(predicate: (value: T, index: number, obj: T[]) => boolean, thisArg?: any): T | undefined;
 
     /**
      * Returns the index of the first element in the array where predicate is true, and -1
@@ -43,9 +41,7 @@ interface Array<T> {
      * @param thisArg If provided, it will be used as the this value for each invocation of
      * predicate. If it is not provided, undefined is used instead.
      */
-    findIndex(predicate: (this: void, value: T, index: number, obj: Array<T>) => boolean): number;
-    findIndex(predicate: (this: void, value: T, index: number, obj: Array<T>) => boolean, thisArg: undefined): number;
-    findIndex<Z>(predicate: (this: Z, value: T, index: number, obj: Array<T>) => boolean, thisArg: Z): number;
+    findIndex(predicate: (value: T, index: number, obj: T[]) => boolean, thisArg?: any): number;
 
     /**
      * Returns the this object after filling the section identified by start and end with value
@@ -76,22 +72,13 @@ interface ArrayConstructor {
      * @param mapfn A mapping function to call on every element of the array.
      * @param thisArg Value of 'this' used to invoke the mapfn.
      */
-    from<T, U>(arrayLike: ArrayLike<T>, mapfn: (this: void, v: T, k: number) => U): Array<U>;
-    from<T, U>(arrayLike: ArrayLike<T>, mapfn: (this: void, v: T, k: number) => U, thisArg: undefined): Array<U>;
-    from<Z, T, U>(arrayLike: ArrayLike<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): Array<U>;
-
-
-    /**
-     * Creates an array from an array-like object.
-     * @param arrayLike An array-like object to convert to an array.
-     */
-    from<T>(arrayLike: ArrayLike<T>): Array<T>;
+    from<T, U = T>(arrayLike: ArrayLike<T>, mapfn?: (v: T, k: number) => U, thisArg?: any): U[];
 
     /**
      * Returns a new array from a set of elements.
      * @param items A set of elements to include in the new array object.
      */
-    of<T>(...items: T[]): Array<T>;
+    of<T>(...items: T[]): T[];
 }
 
 interface DateConstructor {
@@ -360,7 +347,7 @@ interface ObjectConstructor {
      * @param o Object that contains the property.
      * @param p Name of the property.
      */
-    getOwnPropertyDescriptor(o: any, propertyKey: PropertyKey): PropertyDescriptor;
+    getOwnPropertyDescriptor(o: any, propertyKey: PropertyKey): PropertyDescriptor | undefined;
 
     /**
      * Adds a property to an object, or modifies attributes of an existing property.
@@ -383,9 +370,7 @@ interface ReadonlyArray<T> {
      * @param thisArg If provided, it will be used as the this value for each invocation of
      * predicate. If it is not provided, undefined is used instead.
      */
-    find(predicate: (this: void, value: T, index: number, obj: ReadonlyArray<T>) => boolean): T | undefined;
-    find(predicate: (this: void, value: T, index: number, obj: ReadonlyArray<T>) => boolean, thisArg: undefined): T | undefined;
-    find<Z>(predicate: (this: Z, value: T, index: number, obj: ReadonlyArray<T>) => boolean, thisArg: Z): T | undefined;
+    find(predicate: (value: T, index: number, obj: ReadonlyArray<T>) => boolean, thisArg?: any): T | undefined;
 
     /**
      * Returns the index of the first element in the array where predicate is true, and -1
@@ -396,9 +381,7 @@ interface ReadonlyArray<T> {
      * @param thisArg If provided, it will be used as the this value for each invocation of
      * predicate. If it is not provided, undefined is used instead.
      */
-    findIndex(predicate: (this: void, value: T, index: number, obj: Array<T>) => boolean): number;
-    findIndex(predicate: (this: void, value: T, index: number, obj: Array<T>) => boolean, thisArg: undefined): number;
-    findIndex<Z>(predicate: (this: Z, value: T, index: number, obj: Array<T>) => boolean, thisArg: Z): number;
+    findIndex(predicate: (value: T, index: number, obj: ReadonlyArray<T>) => boolean, thisArg?: any): number;
 }
 
 interface RegExp {

lib/lib.dom.d.ts

@@ -74,15 +74,7 @@ interface ArrayConstructor {
      * @param mapfn A mapping function to call on every element of the array.
      * @param thisArg Value of 'this' used to invoke the mapfn.
      */
-    from<T, U>(iterable: Iterable<T>, mapfn: (this: void, v: T, k: number) => U): Array<U>;
-    from<T, U>(iterable: Iterable<T>, mapfn: (this: void, v: T, k: number) => U, thisArg: undefined): Array<U>;
-    from<Z, T, U>(iterable: Iterable<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): Array<U>;
-
-    /**
-     * Creates an array from an iterable object.
-     * @param iterable An iterable object to convert to an array.
-     */
-    from<T>(iterable: Iterable<T>): Array<T>;
+    from<T, U = T>(iterable: Iterable<T>, mapfn?: (v: T, k: number) => U, thisArg?: any): U[];
 }
 
 interface ReadonlyArray<T> {
@@ -237,10 +229,6 @@ interface String {
     [Symbol.iterator](): IterableIterator<string>;
 }
 
-/**
- * A typed array of 8-bit integer values. The contents are initialized to 0. If the requested
- * number of bytes could not be allocated an exception is raised.
- */
 interface Int8Array {
     [Symbol.iterator](): IterableIterator<number>;
     /**
@@ -266,17 +254,9 @@ interface Int8ArrayConstructor {
      * @param mapfn A mapping function to call on every element of the array.
      * @param thisArg Value of 'this' used to invoke the mapfn.
      */
-    from(arrayLike: Iterable<number>, mapfn: (this: void, v: number, k: number) => number): Int8Array;
-    from(arrayLike: Iterable<number>, mapfn: (this: void, v: number, k: number) => number, thisArg: undefined): Int8Array;
-    from<Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int8Array;
-
-    from(arrayLike: Iterable<number>): Int8Array;
+    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int8Array;
 }
 
-/**
- * A typed array of 8-bit unsigned integer values. The contents are initialized to 0. If the
- * requested number of bytes could not be allocated an exception is raised.
- */
 interface Uint8Array {
     [Symbol.iterator](): IterableIterator<number>;
     /**
@@ -302,17 +282,9 @@ interface Uint8ArrayConstructor {
      * @param mapfn A mapping function to call on every element of the array.
      * @param thisArg Value of 'this' used to invoke the mapfn.
      */
-    from(arrayLike: Iterable<number>, mapfn: (this: void, v: number, k: number) => number): Uint8Array;
-    from(arrayLike: Iterable<number>, mapfn: (this: void, v: number, k: number) => number, thisArg: undefined): Uint8Array;
-    from<Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8Array;
-
-    from(arrayLike: Iterable<number>): Uint8Array;
+    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8Array;
 }
 
-/**
- * A typed array of 8-bit unsigned integer (clamped) values. The contents are initialized to 0.
- * If the requested number of bytes could not be allocated an exception is raised.
- */
 interface Uint8ClampedArray {
     [Symbol.iterator](): IterableIterator<number>;
     /**
@@ -341,17 +313,9 @@ interface Uint8ClampedArrayConstructor {
      * @param mapfn A mapping function to call on every element of the array.
      * @param thisArg Value of 'this' used to invoke the mapfn.
      */
-    from(arrayLike: Iterable<number>, mapfn: (this: void, v: number, k: number) => number): Uint8ClampedArray;
-    from(arrayLike: Iterable<number>, mapfn: (this: void, v: number, k: number) => number, thisArg: undefined): Uint8ClampedArray;
-    from<Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8ClampedArray;
-
-    from(arrayLike: Iterable<number>): Uint8ClampedArray;
+    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8ClampedArray;
 }
 
-/**
- * A typed array of 16-bit signed integer values. The contents are initialized to 0. If the
- * requested number of bytes could not be allocated an exception is raised.
- */
 interface Int16Array {
     [Symbol.iterator](): IterableIterator<number>;
     /**
@@ -379,17 +343,9 @@ interface Int16ArrayConstructor {
      * @param mapfn A mapping function to call on every element of the array.
      * @param thisArg Value of 'this' used to invoke the mapfn.
      */
-    from(arrayLike: Iterable<number>, mapfn: (this: void, v: number, k: number) => number): Int16Array;
-    from(arrayLike: Iterable<number>, mapfn: (this: void, v: number, k: number) => number, thisArg: undefined): Int16Array;
-    from<Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int16Array;
-
-    from(arrayLike: Iterable<number>): Int16Array;
+    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int16Array;
 }
 
-/**
- * A typed array of 16-bit unsigned integer values. The contents are initialized to 0. If the
- * requested number of bytes could not be allocated an exception is raised.
- */
 interface Uint16Array {
     [Symbol.iterator](): IterableIterator<number>;
     /**
@@ -415,17 +371,9 @@ interface Uint16ArrayConstructor {
      * @param mapfn A mapping function to call on every element of the array.
      * @param thisArg Value of 'this' used to invoke the mapfn.
      */
-    from(arrayLike: Iterable<number>, mapfn: (this: void, v: number, k: number) => number): Uint16Array;
-    from(arrayLike: Iterable<number>, mapfn: (this: void, v: number, k: number) => number, thisArg: undefined): Uint16Array;
-    from<Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint16Array;
-
-    from(arrayLike: Iterable<number>): Uint16Array;
+    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint16Array;
 }
 
-/**
- * A typed array of 32-bit signed integer values. The contents are initialized to 0. If the
- * requested number of bytes could not be allocated an exception is raised.
- */
 interface Int32Array {
     [Symbol.iterator](): IterableIterator<number>;
     /**
@@ -451,17 +399,9 @@ interface Int32ArrayConstructor {
      * @param mapfn A mapping function to call on every element of the array.
      * @param thisArg Value of 'this' used to invoke the mapfn.
      */
-    from(arrayLike: Iterable<number>, mapfn: (this: void, v: number, k: number) => number): Int32Array;
-    from(arrayLike: Iterable<number>, mapfn: (this: void, v: number, k: number) => number, thisArg: undefined): Int32Array;
-    from<Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int32Array;
-
-    from(arrayLike: Iterable<number>): Int32Array;
+    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int32Array;
 }
 
-/**
- * A typed array of 32-bit unsigned integer values. The contents are initialized to 0. If the
- * requested number of bytes could not be allocated an exception is raised.
- */
 interface Uint32Array {
     [Symbol.iterator](): IterableIterator<number>;
     /**
@@ -487,17 +427,9 @@ interface Uint32ArrayConstructor {
      * @param mapfn A mapping function to call on every element of the array.
      * @param thisArg Value of 'this' used to invoke the mapfn.
      */
-    from(arrayLike: Iterable<number>, mapfn: (this: void, v: number, k: number) => number): Uint32Array;
-    from(arrayLike: Iterable<number>, mapfn: (this: void, v: number, k: number) => number, thisArg: undefined): Uint32Array;
-    from<Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint32Array;
-
-    from(arrayLike: Iterable<number>): Uint32Array;
+    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint32Array;
 }
 
-/**
- * A typed array of 32-bit float values. The contents are initialized to 0. If the requested number
- * of bytes could not be allocated an exception is raised.
- */
 interface Float32Array {
     [Symbol.iterator](): IterableIterator<number>;
     /**
@@ -523,17 +455,9 @@ interface Float32ArrayConstructor {
      * @param mapfn A mapping function to call on every element of the array.
      * @param thisArg Value of 'this' used to invoke the mapfn.
      */
-    from(arrayLike: Iterable<number>, mapfn: (this: void, v: number, k: number) => number): Float32Array;
-    from(arrayLike: Iterable<number>, mapfn: (this: void, v: number, k: number) => number, thisArg: undefined): Float32Array;
-    from<Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float32Array;
-
-    from(arrayLike: Iterable<number>): Float32Array;
+    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float32Array;
 }
 
-/**
- * A typed array of 64-bit float values. The contents are initialized to 0. If the requested
- * number of bytes could not be allocated an exception is raised.
- */
 interface Float64Array {
     [Symbol.iterator](): IterableIterator<number>;
     /**
@@ -559,9 +483,5 @@ interface Float64ArrayConstructor {
      * @param mapfn A mapping function to call on every element of the array.
      * @param thisArg Value of 'this' used to invoke the mapfn.
      */
-    from(arrayLike: Iterable<number>, mapfn: (this: void, v: number, k: number) => number): Float64Array;
-    from(arrayLike: Iterable<number>, mapfn: (this: void, v: number, k: number) => number, thisArg: undefined): Float64Array;
-    from<Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float64Array;
-
-    from(arrayLike: Iterable<number>): Float64Array;
+    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float64Array;
 }

lib/lib.es2015.core.d.ts

@@ -24,11 +24,11 @@ declare namespace Reflect {
     function defineProperty(target: object, propertyKey: PropertyKey, attributes: PropertyDescriptor): boolean;
     function deleteProperty(target: object, propertyKey: PropertyKey): boolean;
     function get(target: object, propertyKey: PropertyKey, receiver?: any): any;
-    function getOwnPropertyDescriptor(target: object, propertyKey: PropertyKey): PropertyDescriptor;
+    function getOwnPropertyDescriptor(target: object, propertyKey: PropertyKey): PropertyDescriptor | undefined;
     function getPrototypeOf(target: object): object;
     function has(target: object, propertyKey: PropertyKey): boolean;
     function isExtensible(target: object): boolean;
-    function ownKeys(target: object): Array<PropertyKey>;
+    function ownKeys(target: object): PropertyKey[];
     function preventExtensions(target: object): boolean;
     function set(target: object, propertyKey: PropertyKey, value: any, receiver?: any): boolean;
     function setPrototypeOf(target: object, proto: any): boolean;

lib/lib.es2015.iterable.d.ts

@@ -260,12 +260,6 @@ interface String {
     split(splitter: { [Symbol.split](string: string, limit?: number): string[]; }, limit?: number): string[];
 }
 
-/**
- * Represents a raw buffer of binary data, which is used to store data for the
- * different typed arrays. ArrayBuffers cannot be read from or written to directly,
- * but can be passed to a typed array or DataView Object to interpret the raw
- * buffer as needed.
- */
 interface ArrayBuffer {
     readonly [Symbol.toStringTag]: "ArrayBuffer";
 }
@@ -274,74 +268,38 @@ interface DataView {
     readonly [Symbol.toStringTag]: "DataView";
 }
 
-/**
- * A typed array of 8-bit integer values. The contents are initialized to 0. If the requested
- * number of bytes could not be allocated an exception is raised.
- */
 interface Int8Array {
     readonly [Symbol.toStringTag]: "Int8Array";
 }
 
-/**
- * A typed array of 8-bit unsigned integer values. The contents are initialized to 0. If the
- * requested number of bytes could not be allocated an exception is raised.
- */
 interface Uint8Array {
     readonly [Symbol.toStringTag]: "UInt8Array";
 }
 
-/**
- * A typed array of 8-bit unsigned integer (clamped) values. The contents are initialized to 0.
- * If the requested number of bytes could not be allocated an exception is raised.
- */
 interface Uint8ClampedArray {
     readonly [Symbol.toStringTag]: "Uint8ClampedArray";
 }
 
-/**
- * A typed array of 16-bit signed integer values. The contents are initialized to 0. If the
- * requested number of bytes could not be allocated an exception is raised.
- */
 interface Int16Array {
     readonly [Symbol.toStringTag]: "Int16Array";
 }
 
-/**
- * A typed array of 16-bit unsigned integer values. The contents are initialized to 0. If the
- * requested number of bytes could not be allocated an exception is raised.
- */
 interface Uint16Array {
     readonly [Symbol.toStringTag]: "Uint16Array";
 }
 
-/**
- * A typed array of 32-bit signed integer values. The contents are initialized to 0. If the
- * requested number of bytes could not be allocated an exception is raised.
- */
 interface Int32Array {
     readonly [Symbol.toStringTag]: "Int32Array";
 }
 
-/**
- * A typed array of 32-bit unsigned integer values. The contents are initialized to 0. If the
- * requested number of bytes could not be allocated an exception is raised.
- */
 interface Uint32Array {
     readonly [Symbol.toStringTag]: "Uint32Array";
 }
 
-/**
- * A typed array of 32-bit float values. The contents are initialized to 0. If the requested number
- * of bytes could not be allocated an exception is raised.
- */
 interface Float32Array {
     readonly [Symbol.toStringTag]: "Float32Array";
 }
 
-/**
- * A typed array of 64-bit float values. The contents are initialized to 0. If the requested
- * number of bytes could not be allocated an exception is raised.
- */
 interface Float64Array {
     readonly [Symbol.toStringTag]: "Float64Array";
 }