TypeScript/tests/baselines/reference/typeInferenceWithTupleType.types at 31d6f324dbe0a23da25c509b2d6e63b110808ee9 · jablko/TypeScript · GitHub

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=== tests/cases/conformance/types/tuple/typeInferenceWithTupleType.ts ===
function combine<T, U>(x: T, y: U): [T, U] {
>combine : <T, U>(x: T, y: U) => [T, U]
>x : T
>y : U

    return [x, y];
>[x, y] : [T, U]
>x : T
>y : U
}

var combineResult = combine("string", 10);
>combineResult : [string, number]
>combine("string", 10) : [string, number]
>combine : <T, U>(x: T, y: U) => [T, U]
>"string" : "string"
>10 : 10

var combineEle1 = combineResult[0]; // string
>combineEle1 : string
>combineResult[0] : string
>combineResult : [string, number]
>0 : 0

var combineEle2 = combineResult[1]; // number
>combineEle2 : number
>combineResult[1] : number
>combineResult : [string, number]
>1 : 1

function zip<T, U>(array1: T[], array2: U[]): [[T, U]] {
>zip : <T, U>(array1: T[], array2: U[]) => [[T, U]]
>array1 : T[]
>array2 : U[]

    if (array1.length != array2.length) {
>array1.length != array2.length : boolean
>array1.length : number
>array1 : T[]
>length : number
>array2.length : number
>array2 : U[]
>length : number

        return [[undefined, undefined]];
>[[undefined, undefined]] : [[undefined, undefined]]
>[undefined, undefined] : [undefined, undefined]
>undefined : undefined
>undefined : undefined
    }
    var length = array1.length;
>length : number
>array1.length : number
>array1 : T[]
>length : number

    var zipResult: [[T, U]];
>zipResult : [[T, U]]

    for (var i = 0; i < length; ++i) {
>i : number
>0 : 0
>i < length : boolean
>i : number
>length : number
>++i : number
>i : number

        zipResult.push([array1[i], array2[i]]);
>zipResult.push([array1[i], array2[i]]) : number
>zipResult.push : (...items: [T, U][]) => number
>zipResult : [[T, U]]
>push : (...items: [T, U][]) => number
>[array1[i], array2[i]] : [T, U]
>array1[i] : T
>array1 : T[]
>i : number
>array2[i] : U
>array2 : U[]
>i : number
    }
    return zipResult;
>zipResult : [[T, U]]
}

var zipResult = zip(["foo", "bar"], [5, 6]);
>zipResult : [[string, number]]
>zip(["foo", "bar"], [5, 6]) : [[string, number]]
>zip : <T, U>(array1: T[], array2: U[]) => [[T, U]]
>["foo", "bar"] : string[]
>"foo" : "foo"
>"bar" : "bar"
>[5, 6] : number[]
>5 : 5
>6 : 6

var zipResultEle = zipResult[0]; // [string, number]
>zipResultEle : [string, number]
>zipResult[0] : [string, number]
>zipResult : [[string, number]]
>0 : 0

var zipResultEleEle = zipResult[0][0]; // string
>zipResultEleEle : string
>zipResult[0][0] : string
>zipResult[0] : [string, number]
>zipResult : [[string, number]]
>0 : 0
>0 : 0

// #33559 and #33752

declare function f1<T1, T2>(values: [T1[], T2[]]): T1;
>f1 : <T1, T2>(values: [T1[], T2[]]) => T1
>values : [T1[], T2[]]

declare function f2<T1, T2>(values: readonly [T1[], T2[]]): T1;
>f2 : <T1, T2>(values: readonly [T1[], T2[]]) => T1
>values : readonly [T1[], T2[]]

let expected: "a";
>expected : "a"

expected = f1(undefined as ["a"[], "b"[]]);
>expected = f1(undefined as ["a"[], "b"[]]) : "a"
>expected : "a"
>f1(undefined as ["a"[], "b"[]]) : "a"
>f1 : <T1, T2>(values: [T1[], T2[]]) => T1
>undefined as ["a"[], "b"[]] : ["a"[], "b"[]]
>undefined : undefined

expected = f2(undefined as ["a"[], "b"[]]);
>expected = f2(undefined as ["a"[], "b"[]]) : "a"
>expected : "a"
>f2(undefined as ["a"[], "b"[]]) : "a"
>f2 : <T1, T2>(values: readonly [T1[], T2[]]) => T1
>undefined as ["a"[], "b"[]] : ["a"[], "b"[]]
>undefined : undefined