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Add tests
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12 files changed

+204
-1
lines changed

‎tests/baselines/reference/arrayConcat2.js‎

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Original file line numberDiff line numberDiff line change
@@ -6,6 +6,21 @@ a.concat('Hello');
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var b = new Array<string>();
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b.concat('hello');
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const expected: undefined = undefined as Flatten<undefined>;
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// #19535
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const [x] = (undefined as unknown as number[][]).concat([1]);
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x == 1;
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// #26378
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[1].concat(['']);
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// #26976
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[].concat([1]);
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//// [arrayConcat2.js]
@@ -14,3 +29,11 @@ a.concat("hello", 'world');
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a.concat('Hello');
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var b = new Array();
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b.concat('hello');
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var expected = undefined;
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// #19535
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var x = undefined.concat([1])[0];
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x == 1;
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// #26378
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[1].concat(['']);
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// #26976
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[].concat([1]);

‎tests/baselines/reference/arrayConcat2.symbols‎

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Original file line numberDiff line numberDiff line change
@@ -21,3 +21,31 @@ b.concat('hello');
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>b : Symbol(b, Decl(arrayConcat2.ts, 5, 3))
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>concat : Symbol(Array.concat, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
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const expected: undefined = undefined as Flatten<undefined>;
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>expected : Symbol(expected, Decl(arrayConcat2.ts, 8, 5))
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>undefined : Symbol(undefined)
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>Flatten : Symbol(Flatten, Decl(lib.es5.d.ts, --, --))
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// #19535
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const [x] = (undefined as unknown as number[][]).concat([1]);
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>x : Symbol(x, Decl(arrayConcat2.ts, 12, 7))
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>(undefined as unknown as number[][]).concat : Symbol(Array.concat, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
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>undefined : Symbol(undefined)
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>concat : Symbol(Array.concat, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
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x == 1;
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>x : Symbol(x, Decl(arrayConcat2.ts, 12, 7))
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// #26378
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[1].concat(['']);
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>[1].concat : Symbol(Array.concat, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
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>concat : Symbol(Array.concat, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
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// #26976
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[].concat([1]);
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>[].concat : Symbol(Array.concat, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
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>concat : Symbol(Array.concat, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
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‎tests/baselines/reference/arrayConcat2.types‎

Lines changed: 46 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,7 +1,7 @@
11
=== tests/cases/compiler/arrayConcat2.ts ===
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var a: string[] = [];
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>a : string[]
4-
>[] : undefined[]
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>[] : never[]
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a.concat("hello", 'world');
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>a.concat("hello", 'world') : string[]
@@ -30,3 +30,48 @@ b.concat('hello');
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>concat : { (...items: ConcatArray<string>[]): string[]; <U extends any[]>(...items: U): (string | Flatten<U[number]>)[]; }
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>'hello' : "hello"
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const expected: undefined = undefined as Flatten<undefined>;
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>expected : undefined
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>undefined as Flatten<undefined> : undefined
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>undefined : undefined
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// #19535
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const [x] = (undefined as unknown as number[][]).concat([1]);
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>x : number | number[]
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>(undefined as unknown as number[][]).concat([1]) : (number | number[])[]
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>(undefined as unknown as number[][]).concat : { (...items: ConcatArray<number[]>[]): number[][]; <U extends any[]>(...items: U): (number[] | Flatten<U[number]>)[]; }
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>(undefined as unknown as number[][]) : number[][]
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>undefined as unknown as number[][] : number[][]
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>undefined as unknown : unknown
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>undefined : undefined
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>concat : { (...items: ConcatArray<number[]>[]): number[][]; <U extends any[]>(...items: U): (number[] | Flatten<U[number]>)[]; }
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>[1] : number[]
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>1 : 1
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x == 1;
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>x == 1 : boolean
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>x : number | number[]
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>1 : 1
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// #26378
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[1].concat(['']);
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>[1].concat(['']) : (string | number)[]
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>[1].concat : { (...items: ConcatArray<number>[]): number[]; <U extends any[]>(...items: U): (number | Flatten<U[number]>)[]; }
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>[1] : number[]
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>1 : 1
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>concat : { (...items: ConcatArray<number>[]): number[]; <U extends any[]>(...items: U): (number | Flatten<U[number]>)[]; }
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>[''] : string[]
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>'' : ""
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// #26976
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[].concat([1]);
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>[].concat([1]) : number[]
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>[].concat : { (...items: ConcatArray<never>[]): never[]; <U extends any[]>(...items: U): Flatten<U[number]>[]; }
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>[] : never[]
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>concat : { (...items: ConcatArray<never>[]): never[]; <U extends any[]>(...items: U): Flatten<U[number]>[]; }
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>[1] : number[]
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>1 : 1
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‎tests/baselines/reference/arrayFlat.js‎

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@@ -0,0 +1,11 @@
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//// [arrayFlat.ts]
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// #24579 and #29604
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const [x] = [[1], ['']].flat();
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const assert: any extends typeof x ? false : true = true;
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//// [arrayFlat.js]
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// #24579 and #29604
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var x = [[1], ['']].flat()[0];
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var assert = true;

‎tests/baselines/reference/arrayFlat.symbols‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,12 @@
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=== tests/cases/compiler/arrayFlat.ts ===
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// #24579 and #29604
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const [x] = [[1], ['']].flat();
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>x : Symbol(x, Decl(arrayFlat.ts, 2, 7))
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>[[1], ['']].flat : Symbol(Array.flat, Decl(lib.es2019.array.d.ts, --, --), Decl(lib.es2019.array.d.ts, --, --), Decl(lib.es2019.array.d.ts, --, --), Decl(lib.es2019.array.d.ts, --, --), Decl(lib.es2019.array.d.ts, --, --) ... and 1 more)
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>flat : Symbol(Array.flat, Decl(lib.es2019.array.d.ts, --, --), Decl(lib.es2019.array.d.ts, --, --), Decl(lib.es2019.array.d.ts, --, --), Decl(lib.es2019.array.d.ts, --, --), Decl(lib.es2019.array.d.ts, --, --) ... and 1 more)
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const assert: any extends typeof x ? false : true = true;
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>assert : Symbol(assert, Decl(arrayFlat.ts, 3, 5))
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>x : Symbol(x, Decl(arrayFlat.ts, 2, 7))
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‎tests/baselines/reference/arrayFlat.types‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,21 @@
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=== tests/cases/compiler/arrayFlat.ts ===
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// #24579 and #29604
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const [x] = [[1], ['']].flat();
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>x : string | number
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>[[1], ['']].flat() : (string | number)[]
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>[[1], ['']].flat : { (depth: 4): (string | number)[]; (depth: 3): (string | number)[]; (depth: 2): (string | number)[]; (depth?: 1): (string | number)[]; (depth: 0): (number[] | string[])[]; (depth: number): (string | number | number[] | string[])[]; }
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>[[1], ['']] : (number[] | string[])[]
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>[1] : number[]
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>1 : 1
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>[''] : string[]
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>'' : ""
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>flat : { (depth: 4): (string | number)[]; (depth: 3): (string | number)[]; (depth: 2): (string | number)[]; (depth?: 1): (string | number)[]; (depth: 0): (number[] | string[])[]; (depth: number): (string | number | number[] | string[])[]; }
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const assert: any extends typeof x ? false : true = true;
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>assert : boolean
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>x : string | number
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>false : false
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>true : true
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>true : true
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‎tests/baselines/reference/arrayFlatMap.js‎

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Original file line numberDiff line numberDiff line change
@@ -3,10 +3,18 @@ const array: number[] = [];
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const readonlyArray: ReadonlyArray<number> = [];
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array.flatMap((): ReadonlyArray<number> => []); // ok
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readonlyArray.flatMap((): ReadonlyArray<number> => []); // ok
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// #19535
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const [x] = [1].flatMap(undefined as () => number[] | number[][]);
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x == 1;
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//// [arrayFlatMap.js]
914
var array = [];
1015
var readonlyArray = [];
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array.flatMap(function () { return []; }); // ok
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readonlyArray.flatMap(function () { return []; }); // ok
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// #19535
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var x = [1].flatMap(undefined)[0];
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x == 1;

‎tests/baselines/reference/arrayFlatMap.symbols‎

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Original file line numberDiff line numberDiff line change
@@ -18,3 +18,14 @@ readonlyArray.flatMap((): ReadonlyArray<number> => []); // ok
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>flatMap : Symbol(ReadonlyArray.flatMap, Decl(lib.es2019.array.d.ts, --, --))
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>ReadonlyArray : Symbol(ReadonlyArray, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es2019.array.d.ts, --, --))
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// #19535
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const [x] = [1].flatMap(undefined as () => number[] | number[][]);
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>x : Symbol(x, Decl(arrayFlatMap.ts, 7, 7))
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>[1].flatMap : Symbol(Array.flatMap, Decl(lib.es2019.array.d.ts, --, --))
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>flatMap : Symbol(Array.flatMap, Decl(lib.es2019.array.d.ts, --, --))
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>undefined : Symbol(undefined)
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x == 1;
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>x : Symbol(x, Decl(arrayFlatMap.ts, 7, 7))
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‎tests/baselines/reference/arrayFlatMap.types‎

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Original file line numberDiff line numberDiff line change
@@ -23,3 +23,20 @@ readonlyArray.flatMap((): ReadonlyArray<number> => []); // ok
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>(): ReadonlyArray<number> => [] : () => readonly number[]
2424
>[] : undefined[]
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// #19535
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const [x] = [1].flatMap(undefined as () => number[] | number[][]);
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>x : number | number[]
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>[1].flatMap(undefined as () => number[] | number[][]) : (number | number[])[]
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>[1].flatMap : <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any) => Flatten<U>[]
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>[1] : number[]
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>1 : 1
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>flatMap : <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any) => Flatten<U>[]
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>undefined as () => number[] | number[][] : () => number[] | number[][]
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>undefined : undefined
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x == 1;
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>x == 1 : boolean
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>x : number | number[]
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>1 : 1
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‎tests/cases/compiler/arrayConcat2.ts‎

Lines changed: 16 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -5,3 +5,19 @@ a.concat('Hello');
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var b = new Array<string>();
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b.concat('hello');
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const expected: undefined = undefined as Flatten<undefined>;
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// #19535
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const [x] = (undefined as unknown as number[][]).concat([1]);
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x == 1;
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// #26378
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[1].concat(['']);
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// #26976
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// @strictNullChecks: true
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[].concat([1]);

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