TypeScript/tests/baselines/reference/arrayConcat2.types at bc574c14738d294789cc0ca4d1c5ce75207b54bc · jablko/TypeScript · GitHub

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=== tests/cases/compiler/arrayConcat2.ts ===
var a: string[] = [];
>a : string[]
>[] : never[]

a.concat("hello", 'world');
>a.concat("hello", 'world') : string[]
>a.concat : { (...items: (string | ConcatArray<string>)[]): string[]; <U>(...items: (U | ConcatArray<U>)[]): (string | U)[]; }
>a : string[]
>concat : { (...items: (string | ConcatArray<string>)[]): string[]; <U>(...items: (U | ConcatArray<U>)[]): (string | U)[]; }
>"hello" : "hello"
>'world' : "world"

a.concat('Hello');
>a.concat('Hello') : string[]
>a.concat : { (...items: (string | ConcatArray<string>)[]): string[]; <U>(...items: (U | ConcatArray<U>)[]): (string | U)[]; }
>a : string[]
>concat : { (...items: (string | ConcatArray<string>)[]): string[]; <U>(...items: (U | ConcatArray<U>)[]): (string | U)[]; }
>'Hello' : "Hello"

var b = new Array<string>();
>b : string[]
>new Array<string>() : string[]
>Array : ArrayConstructor

b.concat('hello');
>b.concat('hello') : string[]
>b.concat : { (...items: (string | ConcatArray<string>)[]): string[]; <U>(...items: (U | ConcatArray<U>)[]): (string | U)[]; }
>b : string[]
>concat : { (...items: (string | ConcatArray<string>)[]): string[]; <U>(...items: (U | ConcatArray<U>)[]): (string | U)[]; }
>'hello' : "hello"

// #26378

[""].concat([1]);
>[""].concat([1]) : (string | number)[]
>[""].concat : { (...items: (string | ConcatArray<string>)[]): string[]; <U>(...items: (U | ConcatArray<U>)[]): (string | U)[]; }
>[""] : string[]
>"" : ""
>concat : { (...items: (string | ConcatArray<string>)[]): string[]; <U>(...items: (U | ConcatArray<U>)[]): (string | U)[]; }
>[1] : number[]
>1 : 1

// #26976

[].concat([""]);
>[].concat([""]) : string[]
>[].concat : { (...items: ConcatArray<never>[]): never[]; <U>(...items: (U | ConcatArray<U>)[]): U[]; }
>[] : never[]
>concat : { (...items: ConcatArray<never>[]): never[]; <U>(...items: (U | ConcatArray<U>)[]): U[]; }
>[""] : string[]
>"" : ""