Shorten the definition

Author: graphemecluster

src/lib/es2015.iterable.d.ts

@@ -60,20 +60,15 @@ interface ArrayConstructor {
         T extends any ? Extract<
             (
                 true extends false & T ? any :
-                T extends (infer U)[] ? U :
                 T extends string | readonly any[] ? unknown :
                 T extends ArrayLike<infer U> | Iterable<infer U> ? U :
                 unknown
             )[] | (
                 true extends false & T ? never :
-                T extends readonly (infer U)[] ? Extract<T, readonly U[]> :
-                never
+                {} extends T ? T & unknown[] :
+                Extract<T, readonly any[]>
             ), T
-        > | (
-            true extends false & T ? never :
-            {} extends T ? T & unknown[] :
-            never
-        ) : never;
+        > : never;
 
     /**
      * Creates an array from an iterable object.

src/lib/es5.d.ts

@@ -1467,20 +1467,15 @@ interface ArrayConstructor {
         T extends any ? Extract<
             (
                 true extends false & T ? any :
-                T extends (infer U)[] ? U :
                 T extends string | readonly any[] ? unknown :
                 T extends ArrayLike<infer U> ? U :
                 unknown
             )[] | (
                 true extends false & T ? never :
-                T extends readonly (infer U)[] ? Extract<T, readonly U[]> :
-                never
+                {} extends T ? T & unknown[] :
+                Extract<T, readonly any[]>
             ), T
-        > | (
-            true extends false & T ? never :
-            {} extends T ? T & unknown[] :
-            never
-        ) : never;
+        > : never;
     readonly prototype: any[];
 }
 

tests/baselines/reference/arrayDestructuringInSwitch1.types

@@ -11,9 +11,9 @@ export function evaluate(expression: Expression): boolean {
 
   if (Array.isArray(expression)) {
 >Array.isArray(expression) : boolean
->Array.isArray : <T>(arg: T) => arg is T extends any ? Extract<(true extends false & T ? any : T extends (infer U)[] ? U : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : T extends readonly (infer U)[] ? Extract<T, readonly U[]> : never, T> | (true extends false & T ? never : {} extends T ? T & unknown[] : never) : never
+>Array.isArray : <T>(arg: T) => arg is T extends any ? Extract<(true extends false & T ? any : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : {} extends T ? T & unknown[] : Extract<T, readonly any[]>, T> : never
 >Array : ArrayConstructor
->isArray : <T>(arg: T) => arg is T extends any ? Extract<(true extends false & T ? any : T extends (infer U)[] ? U : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : T extends readonly (infer U)[] ? Extract<T, readonly U[]> : never, T> | (true extends false & T ? never : {} extends T ? T & unknown[] : never) : never
+>isArray : <T>(arg: T) => arg is T extends any ? Extract<(true extends false & T ? any : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : {} extends T ? T & unknown[] : Extract<T, readonly any[]>, T> : never
 >expression : Expression
 
     const [operator, ...operands] = expression;

tests/baselines/reference/arrayTypeOfTypeOf.types

@@ -14,11 +14,11 @@ var xs2: typeof Array;
 >Array : ArrayConstructor
 
 var xs3: typeof Array<number>;
->xs3 : { (arrayLength: number): number[]; (...items: number[]): number[]; new (arrayLength: number): number[]; new (...items: number[]): number[]; isArray<T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends (infer U)[] ? U : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : T extends readonly (infer U)[] ? Extract<T, readonly U[]> : never, T> | (true extends false & T ? never : {} extends T ? T & unknown[] : never) : never; readonly prototype: any[]; }
+>xs3 : { (arrayLength: number): number[]; (...items: number[]): number[]; new (arrayLength: number): number[]; new (...items: number[]): number[]; isArray<T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : {} extends T ? T & unknown[] : Extract<T, readonly any[]>, T> : never; readonly prototype: any[]; }
 >Array : ArrayConstructor
 
 var xs4: typeof Array<typeof x>;
->xs4 : { (arrayLength: number): number[]; (...items: number[]): number[]; new (arrayLength: number): number[]; new (...items: number[]): number[]; isArray<T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends (infer U)[] ? U : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : T extends readonly (infer U)[] ? Extract<T, readonly U[]> : never, T> | (true extends false & T ? never : {} extends T ? T & unknown[] : never) : never; readonly prototype: any[]; }
+>xs4 : { (arrayLength: number): number[]; (...items: number[]): number[]; new (arrayLength: number): number[]; new (...items: number[]): number[]; isArray<T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : {} extends T ? T & unknown[] : Extract<T, readonly any[]>, T> : never; readonly prototype: any[]; }
 >Array : ArrayConstructor
 >x : number
 

tests/baselines/reference/declarationsWithRecursiveInternalTypesProduceUniqueTypeParams.types

@@ -67,9 +67,9 @@ export const updateIfChanged = <T>(t: T) => {
 >assign : { <T extends {}, U>(target: T, source: U): T & U; <T extends {}, U, V>(target: T, source1: U, source2: V): T & U & V; <T extends {}, U, V, W>(target: T, source1: U, source2: V, source3: W): T & U & V & W; (target: object, ...sources: any[]): any; }
 >Array.isArray(u) ? [] : {} : undefined[] | {}
 >Array.isArray(u) : boolean
->Array.isArray : { <T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends (infer U)[] ? U : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : T extends readonly (infer U)[] ? Extract<T, readonly U[]> : never, T> | (true extends false & T ? never : {} extends T ? T & unknown[] : never) : never; <T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends (infer U)[] ? U : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> | Iterable<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : T extends readonly (infer U)[] ? Extract<T, readonly U[]> : never, T> | (true extends false & T ? never : {} extends T ? T & unknown[] : never) : never; }
+>Array.isArray : { <T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : {} extends T ? T & unknown[] : Extract<T, readonly any[]>, T> : never; <T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> | Iterable<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : {} extends T ? T & unknown[] : Extract<T, readonly any[]>, T> : never; }
 >Array : ArrayConstructor
->isArray : { <T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends (infer U)[] ? U : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : T extends readonly (infer U)[] ? Extract<T, readonly U[]> : never, T> | (true extends false & T ? never : {} extends T ? T & unknown[] : never) : never; <T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends (infer U)[] ? U : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> | Iterable<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : T extends readonly (infer U)[] ? Extract<T, readonly U[]> : never, T> | (true extends false & T ? never : {} extends T ? T & unknown[] : never) : never; }
+>isArray : { <T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : {} extends T ? T & unknown[] : Extract<T, readonly any[]>, T> : never; <T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> | Iterable<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : {} extends T ? T & unknown[] : Extract<T, readonly any[]>, T> : never; }
 >u : U
 >[] : undefined[]
 >{} : {}

tests/baselines/reference/destructuringParameterDeclaration4.errors.txt

@@ -41,7 +41,7 @@ tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration4.ts(
     a1(...array2);            // Error parameter type is (number|string)[]
           ~~~~~~
 !!! error TS2552: Cannot find name 'array2'. Did you mean 'Array'?
-!!! related TS2728 /.ts/lib.es5.d.ts:1507:13: 'Array' is declared here.
+!!! related TS2728 /.ts/lib.es5.d.ts:1502:13: 'Array' is declared here.
     a5([1, 2, "string", false, true]);       // Error, parameter type is [any, any, [[any]]]
               ~~~~~~~~
 !!! error TS2322: Type 'string' is not assignable to type '[[any]]'.

tests/baselines/reference/fixSignatureCaching.types

@@ -1109,9 +1109,9 @@ define(function () {
 >Array : ArrayConstructor
 
         Array.isArray : function (value) { return Object.prototype.toString.call(value) === '[object Array]'; };
->Array.isArray : <T>(arg: T) => arg is T extends any ? Extract<(true extends false & T ? any : T extends (infer U)[] ? U : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : T extends readonly (infer U)[] ? Extract<T, readonly U[]> : never, T> | (true extends false & T ? never : {} extends T ? T & unknown[] : never) : never
+>Array.isArray : <T>(arg: T) => arg is T extends any ? Extract<(true extends false & T ? any : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : {} extends T ? T & unknown[] : Extract<T, readonly any[]>, T> : never
 >Array : ArrayConstructor
->isArray : <T>(arg: T) => arg is T extends any ? Extract<(true extends false & T ? any : T extends (infer U)[] ? U : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : T extends readonly (infer U)[] ? Extract<T, readonly U[]> : never, T> | (true extends false & T ? never : {} extends T ? T & unknown[] : never) : never
+>isArray : <T>(arg: T) => arg is T extends any ? Extract<(true extends false & T ? any : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : {} extends T ? T & unknown[] : Extract<T, readonly any[]>, T> : never
 >function (value) { return Object.prototype.toString.call(value) === '[object Array]'; } : (value: any) => boolean
 >value : any
 >Object.prototype.toString.call(value) === '[object Array]' : boolean
@@ -1150,9 +1150,9 @@ define(function () {
 >'[object Array]' : "[object Array]"
 
         : Array.isArray;
->Array.isArray : <T>(arg: T) => arg is T extends any ? Extract<(true extends false & T ? any : T extends (infer U)[] ? U : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : T extends readonly (infer U)[] ? Extract<T, readonly U[]> : never, T> | (true extends false & T ? never : {} extends T ? T & unknown[] : never) : never
+>Array.isArray : <T>(arg: T) => arg is T extends any ? Extract<(true extends false & T ? any : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : {} extends T ? T & unknown[] : Extract<T, readonly any[]>, T> : never
 >Array : ArrayConstructor
->isArray : <T>(arg: T) => arg is T extends any ? Extract<(true extends false & T ? any : T extends (infer U)[] ? U : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : T extends readonly (infer U)[] ? Extract<T, readonly U[]> : never, T> | (true extends false & T ? never : {} extends T ? T & unknown[] : never) : never
+>isArray : <T>(arg: T) => arg is T extends any ? Extract<(true extends false & T ? any : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : {} extends T ? T & unknown[] : Extract<T, readonly any[]>, T> : never
 
     function equalIC(a, b) {
 >equalIC : (a: any, b: any) => boolean

tests/baselines/reference/instantiationExpressions.types

@@ -61,13 +61,13 @@ function f2() {
 >Array : ArrayConstructor
 
     const A1 = Array<string>;  // new (...) => string[]
->A1 : { (arrayLength: number): string[]; (...items: string[]): string[]; new (arrayLength: number): string[]; new (...items: string[]): string[]; isArray<T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends (infer U)[] ? U : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : T extends readonly (infer U)[] ? Extract<T, readonly U[]> : never, T> | (true extends false & T ? never : {} extends T ? T & unknown[] : never) : never; readonly prototype: any[]; }
->Array<string> : { (arrayLength: number): string[]; (...items: string[]): string[]; new (arrayLength: number): string[]; new (...items: string[]): string[]; isArray<T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends (infer U)[] ? U : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : T extends readonly (infer U)[] ? Extract<T, readonly U[]> : never, T> | (true extends false & T ? never : {} extends T ? T & unknown[] : never) : never; readonly prototype: any[]; }
+>A1 : { (arrayLength: number): string[]; (...items: string[]): string[]; new (arrayLength: number): string[]; new (...items: string[]): string[]; isArray<T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : {} extends T ? T & unknown[] : Extract<T, readonly any[]>, T> : never; readonly prototype: any[]; }
+>Array<string> : { (arrayLength: number): string[]; (...items: string[]): string[]; new (arrayLength: number): string[]; new (...items: string[]): string[]; isArray<T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : {} extends T ? T & unknown[] : Extract<T, readonly any[]>, T> : never; readonly prototype: any[]; }
 >Array : ArrayConstructor
 
     const A2 = Array<string, number>;  // Error
->A2 : { isArray<T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends (infer U)[] ? U : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : T extends readonly (infer U)[] ? Extract<T, readonly U[]> : never, T> | (true extends false & T ? never : {} extends T ? T & unknown[] : never) : never; readonly prototype: any[]; }
->Array<string, number> : { isArray<T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends (infer U)[] ? U : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : T extends readonly (infer U)[] ? Extract<T, readonly U[]> : never, T> | (true extends false & T ? never : {} extends T ? T & unknown[] : never) : never; readonly prototype: any[]; }
+>A2 : { isArray<T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : {} extends T ? T & unknown[] : Extract<T, readonly any[]>, T> : never; readonly prototype: any[]; }
+>Array<string, number> : { isArray<T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : {} extends T ? T & unknown[] : Extract<T, readonly any[]>, T> : never; readonly prototype: any[]; }
 >Array : ArrayConstructor
 }
 
@@ -76,11 +76,11 @@ type T20 = typeof Array<>;  // Error
 >Array : ArrayConstructor
 
 type T21 = typeof Array<string>;  // new (...) => string[]
->T21 : { (arrayLength: number): string[]; (...items: string[]): string[]; new (arrayLength: number): string[]; new (...items: string[]): string[]; isArray<T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends (infer U)[] ? U : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : T extends readonly (infer U)[] ? Extract<T, readonly U[]> : never, T> | (true extends false & T ? never : {} extends T ? T & unknown[] : never) : never; readonly prototype: any[]; }
+>T21 : { (arrayLength: number): string[]; (...items: string[]): string[]; new (arrayLength: number): string[]; new (...items: string[]): string[]; isArray<T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : {} extends T ? T & unknown[] : Extract<T, readonly any[]>, T> : never; readonly prototype: any[]; }
 >Array : ArrayConstructor
 
 type T22 = typeof Array<string, number>;  // Error
->T22 : { isArray<T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends (infer U)[] ? U : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : T extends readonly (infer U)[] ? Extract<T, readonly U[]> : never, T> | (true extends false & T ? never : {} extends T ? T & unknown[] : never) : never; readonly prototype: any[]; }
+>T22 : { isArray<T>(arg: T): arg is T extends any ? Extract<(true extends false & T ? any : T extends string | readonly any[] ? unknown : T extends ArrayLike<infer U> ? U : unknown)[], T> | Extract<true extends false & T ? never : {} extends T ? T & unknown[] : Extract<T, readonly any[]>, T> : never; readonly prototype: any[]; }
 >Array : ArrayConstructor
 
 declare class C<T> {