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@@ -0,0 +1,342 @@
+/*! *****************************************************************************
+Copyright (c) Microsoft Corporation. All rights reserved.
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use
+this file except in compliance with the License. You may obtain a copy of the
+License at http://www.apache.org/licenses/LICENSE-2.0
+
+THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
+WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
+MERCHANTABLITY OR NON-INFRINGEMENT.
+
+See the Apache Version 2.0 License for specific language governing permissions
+and limitations under the License.
+***************************************************************************** */
+
+
+/// <reference no-default-lib="true"/>
+
+interface Array<T> {
+    /**
+     * Returns the value of the last element in the array where predicate is true, and undefined
+     * otherwise.
+     * @param predicate findLast calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found, findLast
+     * immediately returns that element value. Otherwise, findLast returns undefined.
+     * @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.
+     */
+    findLast<S extends T>(predicate: (value: T, index: number, array: T[]) => value is S, thisArg?: any): S | undefined;
+    findLast(predicate: (value: T, index: number, array: T[]) => unknown, thisArg?: any): T | undefined;
+
+    /**
+     * Returns the index of the last element in the array where predicate is true, and -1
+     * otherwise.
+     * @param predicate findLastIndex calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found,
+     * findLastIndex immediately returns that element index. Otherwise, findLastIndex returns -1.
+     * @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.
+     */
+    findLastIndex(predicate: (value: T, index: number, array: T[]) => unknown, thisArg?: any): number;
+}
+
+interface ReadonlyArray<T> {
+    /**
+     * Returns the value of the last element in the array where predicate is true, and undefined
+     * otherwise.
+     * @param predicate findLast calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found, findLast
+     * immediately returns that element value. Otherwise, findLast returns undefined.
+     * @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.
+     */
+    findLast<S extends T>(predicate: (value: T, index: number, array: readonly T[]) => value is S, thisArg?: any): S | undefined;
+    findLast(predicate: (value: T, index: number, array: readonly T[]) => unknown, thisArg?: any): T | undefined;
+
+    /**
+     * Returns the index of the last element in the array where predicate is true, and -1
+     * otherwise.
+     * @param predicate findLastIndex calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found,
+     * findLastIndex immediately returns that element index. Otherwise, findLastIndex returns -1.
+     * @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.
+     */
+    findLastIndex(predicate: (value: T, index: number, array: readonly T[]) => unknown, thisArg?: any): number;
+}
+
+interface Int8Array {
+    /**
+     * Returns the value of the last element in the array where predicate is true, and undefined
+     * otherwise.
+     * @param predicate findLast calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found, findLast
+     * immediately returns that element value. Otherwise, findLast returns undefined.
+     * @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.
+     */
+    findLast<S extends number>(predicate: (value: number, index: number, array: Int8Array) => value is S, thisArg?: any): S | undefined;
+    findLast(predicate: (value: number, index: number, array: Int8Array) => unknown, thisArg?: any): number | undefined;
+
+    /**
+     * Returns the index of the last element in the array where predicate is true, and -1
+     * otherwise.
+     * @param predicate findLastIndex calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found,
+     * findLastIndex immediately returns that element index. Otherwise, findLastIndex returns -1.
+     * @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.
+     */
+    findLastIndex(predicate: (value: number, index: number, array: Int8Array) => unknown, thisArg?: any): number;
+}
+
+interface Uint8Array {
+    /**
+     * Returns the value of the last element in the array where predicate is true, and undefined
+     * otherwise.
+     * @param predicate findLast calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found, findLast
+     * immediately returns that element value. Otherwise, findLast returns undefined.
+     * @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.
+     */
+    findLast<S extends number>(predicate: (value: number, index: number, array: Uint8Array) => value is S, thisArg?: any): S | undefined;
+    findLast(predicate: (value: number, index: number, array: Uint8Array) => unknown, thisArg?: any): number | undefined;
+
+    /**
+     * Returns the index of the last element in the array where predicate is true, and -1
+     * otherwise.
+     * @param predicate findLastIndex calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found,
+     * findLastIndex immediately returns that element index. Otherwise, findLastIndex returns -1.
+     * @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.
+     */
+    findLastIndex(predicate: (value: number, index: number, array: Uint8Array) => unknown, thisArg?: any): number;
+}
+
+interface Uint8ClampedArray {
+    /**
+     * Returns the value of the last element in the array where predicate is true, and undefined
+     * otherwise.
+     * @param predicate findLast calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found, findLast
+     * immediately returns that element value. Otherwise, findLast returns undefined.
+     * @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.
+     */
+    findLast<S extends number>(predicate: (value: number, index: number, array: Uint8ClampedArray) => value is S, thisArg?: any): S | undefined;
+    findLast(predicate: (value: number, index: number, array: Uint8ClampedArray) => unknown, thisArg?: any): number | undefined;
+
+    /**
+     * Returns the index of the last element in the array where predicate is true, and -1
+     * otherwise.
+     * @param predicate findLastIndex calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found,
+     * findLastIndex immediately returns that element index. Otherwise, findLastIndex returns -1.
+     * @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.
+     */
+    findLastIndex(predicate: (value: number, index: number, array: Uint8ClampedArray) => unknown, thisArg?: any): number;
+}
+
+interface Int16Array {
+    /**
+     * Returns the value of the last element in the array where predicate is true, and undefined
+     * otherwise.
+     * @param predicate findLast calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found, findLast
+     * immediately returns that element value. Otherwise, findLast returns undefined.
+     * @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.
+     */
+    findLast<S extends number>(predicate: (value: number, index: number, array: Int16Array) => value is S, thisArg?: any): S | undefined;
+    findLast(predicate: (value: number, index: number, array: Int16Array) => unknown, thisArg?: any): number | undefined;
+
+    /**
+     * Returns the index of the last element in the array where predicate is true, and -1
+     * otherwise.
+     * @param predicate findLastIndex calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found,
+     * findLastIndex immediately returns that element index. Otherwise, findLastIndex returns -1.
+     * @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.
+     */
+    findLastIndex(predicate: (value: number, index: number, array: Int16Array) => unknown, thisArg?: any): number;
+}
+
+interface Uint16Array {
+    /**
+     * Returns the value of the last element in the array where predicate is true, and undefined
+     * otherwise.
+     * @param predicate findLast calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found, findLast
+     * immediately returns that element value. Otherwise, findLast returns undefined.
+     * @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.
+     */
+    findLast<S extends number>(predicate: (value: number, index: number, array: Uint16Array) => value is S, thisArg?: any): S | undefined;
+    findLast(predicate: (value: number, index: number, array: Uint16Array) => unknown, thisArg?: any): number | undefined;
+
+    /**
+     * Returns the index of the last element in the array where predicate is true, and -1
+     * otherwise.
+     * @param predicate findLastIndex calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found,
+     * findLastIndex immediately returns that element index. Otherwise, findLastIndex returns -1.
+     * @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.
+     */
+    findLastIndex(predicate: (value: number, index: number, array: Uint16Array) => unknown, thisArg?: any): number;
+}
+
+interface Int32Array {
+    /**
+     * Returns the value of the last element in the array where predicate is true, and undefined
+     * otherwise.
+     * @param predicate findLast calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found, findLast
+     * immediately returns that element value. Otherwise, findLast returns undefined.
+     * @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.
+     */
+    findLast<S extends number>(predicate: (value: number, index: number, array: Int32Array) => value is S, thisArg?: any): S | undefined;
+    findLast(predicate: (value: number, index: number, array: Int32Array) => unknown, thisArg?: any): number | undefined;
+
+    /**
+     * Returns the index of the last element in the array where predicate is true, and -1
+     * otherwise.
+     * @param predicate findLastIndex calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found,
+     * findLastIndex immediately returns that element index. Otherwise, findLastIndex returns -1.
+     * @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.
+     */
+    findLastIndex(predicate: (value: number, index: number, array: Int32Array) => unknown, thisArg?: any): number;
+}
+
+interface Uint32Array {
+    /**
+     * Returns the value of the last element in the array where predicate is true, and undefined
+     * otherwise.
+     * @param predicate findLast calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found, findLast
+     * immediately returns that element value. Otherwise, findLast returns undefined.
+     * @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.
+     */
+    findLast<S extends number>(predicate: (value: number, index: number, array: Uint32Array) => value is S, thisArg?: any): S | undefined;
+    findLast(predicate: (value: number, index: number, array: Uint32Array) => unknown, thisArg?: any): number | undefined;
+
+    /**
+     * Returns the index of the last element in the array where predicate is true, and -1
+     * otherwise.
+     * @param predicate findLastIndex calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found,
+     * findLastIndex immediately returns that element index. Otherwise, findLastIndex returns -1.
+     * @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.
+     */
+    findLastIndex(predicate: (value: number, index: number, array: Uint32Array) => unknown, thisArg?: any): number;
+}
+
+interface Float32Array {
+    /**
+     * Returns the value of the last element in the array where predicate is true, and undefined
+     * otherwise.
+     * @param predicate findLast calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found, findLast
+     * immediately returns that element value. Otherwise, findLast returns undefined.
+     * @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.
+     */
+    findLast<S extends number>(predicate: (value: number, index: number, array: Float32Array) => value is S, thisArg?: any): S | undefined;
+    findLast(predicate: (value: number, index: number, array: Float32Array) => unknown, thisArg?: any): number | undefined;
+
+    /**
+     * Returns the index of the last element in the array where predicate is true, and -1
+     * otherwise.
+     * @param predicate findLastIndex calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found,
+     * findLastIndex immediately returns that element index. Otherwise, findLastIndex returns -1.
+     * @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.
+     */
+    findLastIndex(predicate: (value: number, index: number, array: Float32Array) => unknown, thisArg?: any): number;
+}
+
+interface Float64Array {
+    /**
+     * Returns the value of the last element in the array where predicate is true, and undefined
+     * otherwise.
+     * @param predicate findLast calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found, findLast
+     * immediately returns that element value. Otherwise, findLast returns undefined.
+     * @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.
+     */
+    findLast<S extends number>(predicate: (value: number, index: number, array: Float64Array) => value is S, thisArg?: any): S | undefined;
+    findLast(predicate: (value: number, index: number, array: Float64Array) => unknown, thisArg?: any): number | undefined;
+
+    /**
+     * Returns the index of the last element in the array where predicate is true, and -1
+     * otherwise.
+     * @param predicate findLastIndex calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found,
+     * findLastIndex immediately returns that element index. Otherwise, findLastIndex returns -1.
+     * @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.
+     */
+    findLastIndex(predicate: (value: number, index: number, array: Float64Array) => unknown, thisArg?: any): number;
+}
+
+interface BigInt64Array {
+    /**
+     * Returns the value of the last element in the array where predicate is true, and undefined
+     * otherwise.
+     * @param predicate findLast calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found, findLast
+     * immediately returns that element value. Otherwise, findLast returns undefined.
+     * @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.
+     */
+    findLast<S extends bigint>(predicate: (value: bigint, index: number, array: BigInt64Array) => value is S, thisArg?: any): S | undefined;
+    findLast(predicate: (value: bigint, index: number, array: BigInt64Array) => unknown, thisArg?: any): bigint | undefined;
+
+    /**
+     * Returns the index of the last element in the array where predicate is true, and -1
+     * otherwise.
+     * @param predicate findLastIndex calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found,
+     * findLastIndex immediately returns that element index. Otherwise, findLastIndex returns -1.
+     * @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.
+     */
+    findLastIndex(predicate: (value: bigint, index: number, array: BigInt64Array) => unknown, thisArg?: any): number;
+}
+
+interface BigUint64Array {
+    /**
+     * Returns the value of the last element in the array where predicate is true, and undefined
+     * otherwise.
+     * @param predicate findLast calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found, findLast
+     * immediately returns that element value. Otherwise, findLast returns undefined.
+     * @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.
+     */
+    findLast<S extends bigint>(predicate: (value: bigint, index: number, array: BigUint64Array) => value is S, thisArg?: any): S | undefined;
+    findLast(predicate: (value: bigint, index: number, array: BigUint64Array) => unknown, thisArg?: any): bigint | undefined;
+
+    /**
+     * Returns the index of the last element in the array where predicate is true, and -1
+     * otherwise.
+     * @param predicate findLastIndex calls predicate once for each element of the array, in descending
+     * order, until it finds one where predicate returns true. If such an element is found,
+     * findLastIndex immediately returns that element index. Otherwise, findLastIndex returns -1.
+     * @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.
+     */
+    findLastIndex(predicate: (value: bigint, index: number, array: BigUint64Array) => unknown, thisArg?: any): number;
+}