Update LKG for 5.2.1 RC.

Author: DanielRosenwasser

lib/lib.es2015.core.d.ts

@@ -56,10 +56,10 @@ interface Array<T> {
      * @param target If target is negative, it is treated as length+target where length is the
      * length of the array.
      * @param start If start is negative, it is treated as length+start. If end is negative, it
-     * is treated as length+end. If start is omitted, `0` is used.
+     * is treated as length+end.
      * @param end If not specified, length of the this object is used as its default value.
      */
-    copyWithin(target: number, start?: number, end?: number): this;
+    copyWithin(target: number, start: number, end?: number): this;
 }
 
 interface ArrayConstructor {

lib/lib.es2020.bigint.d.ts

@@ -165,10 +165,10 @@ interface BigInt64Array {
      * @param target If target is negative, it is treated as length+target where length is the
      * length of the array.
      * @param start If start is negative, it is treated as length+start. If end is negative, it
-     * is treated as length+end. If start is omitted, `0` is used.
+     * is treated as length+end.
      * @param end If not specified, length of the this object is used as its default value.
      */
-    copyWithin(target: number, start?: number, end?: number): this;
+    copyWithin(target: number, start: number, end?: number): this;
 
     /** Yields index, value pairs for every entry in the array. */
     entries(): IterableIterator<[number, bigint]>;
@@ -437,10 +437,10 @@ interface BigUint64Array {
      * @param target If target is negative, it is treated as length+target where length is the
      * length of the array.
      * @param start If start is negative, it is treated as length+start. If end is negative, it
-     * is treated as length+end. If start is omitted, `0` is used.
+     * is treated as length+end.
      * @param end If not specified, length of the this object is used as its default value.
      */
-    copyWithin(target: number, start?: number, end?: number): this;
+    copyWithin(target: number, start: number, end?: number): this;
 
     /** Yields index, value pairs for every entry in the array. */
     entries(): IterableIterator<[number, bigint]>;

lib/lib.es5.d.ts

@@ -1889,10 +1889,10 @@ interface Int8Array {
      * @param target If target is negative, it is treated as length+target where length is the
      * length of the array.
      * @param start If start is negative, it is treated as length+start. If end is negative, it
-     * is treated as length+end. If start is omitted, `0` is used.
+     * is treated as length+end.
      * @param end If not specified, length of the this object is used as its default value.
      */
-    copyWithin(target: number, start?: number, end?: number): this;
+    copyWithin(target: number, start: number, end?: number): this;
 
     /**
      * Determines whether all the members of an array satisfy the specified test.
@@ -2171,10 +2171,10 @@ interface Uint8Array {
      * @param target If target is negative, it is treated as length+target where length is the
      * length of the array.
      * @param start If start is negative, it is treated as length+start. If end is negative, it
-     * is treated as length+end. If start is omitted, `0` is used.
+     * is treated as length+end.
      * @param end If not specified, length of the this object is used as its default value.
      */
-    copyWithin(target: number, start?: number, end?: number): this;
+    copyWithin(target: number, start: number, end?: number): this;
 
     /**
      * Determines whether all the members of an array satisfy the specified test.
@@ -2453,10 +2453,10 @@ interface Uint8ClampedArray {
      * @param target If target is negative, it is treated as length+target where length is the
      * length of the array.
      * @param start If start is negative, it is treated as length+start. If end is negative, it
-     * is treated as length+end. If start is omitted, `0` is used.
+     * is treated as length+end.
      * @param end If not specified, length of the this object is used as its default value.
      */
-    copyWithin(target: number, start?: number, end?: number): this;
+    copyWithin(target: number, start: number, end?: number): this;
 
     /**
      * Determines whether all the members of an array satisfy the specified test.
@@ -2734,10 +2734,10 @@ interface Int16Array {
      * @param target If target is negative, it is treated as length+target where length is the
      * length of the array.
      * @param start If start is negative, it is treated as length+start. If end is negative, it
-     * is treated as length+end. If start is omitted, `0` is used.
+     * is treated as length+end.
      * @param end If not specified, length of the this object is used as its default value.
      */
-    copyWithin(target: number, start?: number, end?: number): this;
+    copyWithin(target: number, start: number, end?: number): this;
 
     /**
      * Determines whether all the members of an array satisfy the specified test.
@@ -3016,10 +3016,10 @@ interface Uint16Array {
      * @param target If target is negative, it is treated as length+target where length is the
      * length of the array.
      * @param start If start is negative, it is treated as length+start. If end is negative, it
-     * is treated as length+end. If start is omitted, `0` is used.
+     * is treated as length+end.
      * @param end If not specified, length of the this object is used as its default value.
      */
-    copyWithin(target: number, start?: number, end?: number): this;
+    copyWithin(target: number, start: number, end?: number): this;
 
     /**
      * Determines whether all the members of an array satisfy the specified test.
@@ -3298,10 +3298,10 @@ interface Int32Array {
      * @param target If target is negative, it is treated as length+target where length is the
      * length of the array.
      * @param start If start is negative, it is treated as length+start. If end is negative, it
-     * is treated as length+end. If start is omitted, `0` is used.
+     * is treated as length+end.
      * @param end If not specified, length of the this object is used as its default value.
      */
-    copyWithin(target: number, start?: number, end?: number): this;
+    copyWithin(target: number, start: number, end?: number): this;
 
     /**
      * Determines whether all the members of an array satisfy the specified test.
@@ -3580,10 +3580,10 @@ interface Uint32Array {
      * @param target If target is negative, it is treated as length+target where length is the
      * length of the array.
      * @param start If start is negative, it is treated as length+start. If end is negative, it
-     * is treated as length+end. If start is omitted, `0` is used.
+     * is treated as length+end.
      * @param end If not specified, length of the this object is used as its default value.
      */
-    copyWithin(target: number, start?: number, end?: number): this;
+    copyWithin(target: number, start: number, end?: number): this;
 
     /**
      * Determines whether all the members of an array satisfy the specified test.
@@ -3861,10 +3861,10 @@ interface Float32Array {
      * @param target If target is negative, it is treated as length+target where length is the
      * length of the array.
      * @param start If start is negative, it is treated as length+start. If end is negative, it
-     * is treated as length+end. If start is omitted, `0` is used.
+     * is treated as length+end.
      * @param end If not specified, length of the this object is used as its default value.
      */
-    copyWithin(target: number, start?: number, end?: number): this;
+    copyWithin(target: number, start: number, end?: number): this;
 
     /**
      * Determines whether all the members of an array satisfy the specified test.
@@ -4144,10 +4144,10 @@ interface Float64Array {
      * @param target If target is negative, it is treated as length+target where length is the
      * length of the array.
      * @param start If start is negative, it is treated as length+start. If end is negative, it
-     * is treated as length+end. If start is omitted, `0` is used.
+     * is treated as length+end.
      * @param end If not specified, length of the this object is used as its default value.
      */
-    copyWithin(target: number, start?: number, end?: number): this;
+    copyWithin(target: number, start: number, end?: number): this;
 
     /**
      * Determines whether all the members of an array satisfy the specified test.