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Fix for Issue 61081 #61221

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d1ee4a6
Adds proper description of 'deleteCount' argument for the 'splice' fu…
JulianTaub Feb 6, 2025
f5ba5a9
Adds proper description of 'deleteCount' argument for the 'splice' …
JulianTaub Feb 6, 2025
b80dfc4
Adds deleteCount compiler and fourslash tests. Adds baseline refrence…
JulianTaub Feb 14, 2025
bc5fa06
Formats lib/es5.d.ts
JulianTaub Feb 19, 2025
6d23448
Adds reformatted baseline tests to refrence
JulianTaub Feb 21, 2025
cba1242
Fixes typo and takes out 'Note:' part of description
JulianTaub Mar 7, 2025
9dc1b9e
Rolls back all changes except for es5.d.ts
JulianTaub Jul 6, 2025
a0a316f
Adds fourslash test baseline files affected by es5.d.ts changes
JulianTaub Jul 7, 2025
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10 changes: 8 additions & 2 deletions src/lib/es5.d.ts
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Expand Up @@ -1375,14 +1375,20 @@ interface Array<T> {
/**
* Removes elements from an array and, if necessary, inserts new elements in their place, returning the deleted elements.
* @param start The zero-based location in the array from which to start removing elements.
* @param deleteCount The number of elements to remove.
* @param deleteCount The number of elements to remove. Omitting this argument will remove all elements from the start
* paramater location to end of the array. If value of this argument is either a negative number, zero, undefined, or a type
* that cannot be coverted to an integer, the function will evaluate the argument as zero and not remove any elements.
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possible typo?, "coverted"

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Hi @birgersp, yes it is a typo. I just fixed it and pushed it up.

* @returns An array containing the elements that were deleted.
*/
splice(start: number, deleteCount?: number): T[];
/**
* Removes elements from an array and, if necessary, inserts new elements in their place, returning the deleted elements.
* @param start The zero-based location in the array from which to start removing elements.
* @param deleteCount The number of elements to remove.
* @param deleteCount The number of elements to remove. If value of this argument is either a negative number, zero,
* undefined, or a type that cannot be coverted to an integer, the function will evaluate the argument as zero and
* not remove any elements.
* Note: If the deleteCount argument is left empty between the start and items arguments, it will not be evaluated as
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what does "left empty" mean, specifically?
if you mean "omitted" then that's not really valid, because the compiler will throw an error; "No overload matches this call". IMO this note can be removed.

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@birgersp, yes I meant omitted. I just took out that sentence (that started with "Note") and pushed it up in the latest commit.

* an omission. Instead, it will be evaluated as undefined, which will be evaluated as zero.
* @param items Elements to insert into the array in place of the deleted elements.
* @returns An array containing the elements that were deleted.
*/
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66 changes: 66 additions & 0 deletions tests/baselines/reference/arraySpliceParamDescription.errors.txt
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arraySpliceParamDescription.ts(12,34): error TS2769: No overload matches this call.
Overload 1 of 2, '(start: number, deleteCount?: number): string[]', gave the following error.
Argument of type 'string' is not assignable to parameter of type 'number'.
Overload 2 of 2, '(start: number, deleteCount: number, ...items: string[]): string[]', gave the following error.
Argument of type 'string' is not assignable to parameter of type 'number'.
arraySpliceParamDescription.ts(32,34): error TS1135: Argument expression expected.
arraySpliceParamDescription.ts(32,36): error TS2345: Argument of type 'string' is not assignable to parameter of type 'number'.
arraySpliceParamDescription.ts(34,34): error TS2345: Argument of type 'string' is not assignable to parameter of type 'number'.


==== arraySpliceParamDescription.ts (4 errors) ====
// @target es5

export function isEmptyArr(l: { length: number }) {
return l.length === 0
}

var arrA : string[]
arrA = ["a", "b", "c", "d", "e", "f", "g"]

// deleteCount param: undefined | NaN | 0 | -int; no elements removed
var undefSplice1 = arrA.splice(2, undefined) // OK
var charSplice1 = arrA.splice(2, "a") // expect error
~~~
!!! error TS2769: No overload matches this call.
!!! error TS2769: Overload 1 of 2, '(start: number, deleteCount?: number): string[]', gave the following error.
!!! error TS2769: Argument of type 'string' is not assignable to parameter of type 'number'.
!!! error TS2769: Overload 2 of 2, '(start: number, deleteCount: number, ...items: string[]): string[]', gave the following error.
!!! error TS2769: Argument of type 'string' is not assignable to parameter of type 'number'.
var naNSplice1 = arrA.splice(2, NaN) // OK
var zeroSplice1 = arrA.splice(2, 0) // OK
var negSplice1 = arrA.splice(2, -2) // OK and expect arrA = ["a", "b", "c", "d", "e", "f", "g"]

// deleteCount param omitted; All elements after start param are removed
var omitSplice1 = arrA.splice(2,) // OK expect arrA = ["a", "b"]

// testing the splice arrays are empty
isEmptyArr(undefSplice1) // OK and true
isEmptyArr(charSplice1) // OK and true
isEmptyArr(naNSplice1) // OK and true
isEmptyArr(zeroSplice1) // OK and true
isEmptyArr(negSplice1) // OK and true
isEmptyArr(omitSplice1) // OK and false. length of removed elements is 5

var arrB : string[]
arrB = ["a", "b", "c", "d", "e", "f", "g"]

var undefSplice2 = arrB.splice(2, undefined, "h", "i") // expect error and arrB = ["a", "b", "h", "i", "e", "f", "g"]
var omitSplice2 = arrB.splice(2, , "j", "k") // expect error and arrB = ["a", "b", "j", "k", "e", "f", "g"]
~
!!! error TS1135: Argument expression expected.
~~~
!!! error TS2345: Argument of type 'string' is not assignable to parameter of type 'number'.
var naNSplice2 = arrB.splice(2, NaN, "l", "m") // OK and arrB = ["a", "b", "l", "m", "e", "f", "g"]
var charSplice2 = arrB.splice(2, "a", "n", "o") // expect error and arrB = ["a", "b", "n", "o", "e", "f", "g"]
~~~
!!! error TS2345: Argument of type 'string' is not assignable to parameter of type 'number'.
var zeroSplice2 = arrB.splice(2, 0, "p", "q") // OK and arrB = ["a", "b", "p", "q", "e", "f", "g"]
var negSplice2 = arrB.splice(2, -2, "r", "s") // OK and arrB = ["a", "b", "r", "s", "e", "f", "g"]

isEmptyArr(undefSplice2) // OK and true
isEmptyArr(omitSplice2) // OK and true
isEmptyArr(naNSplice2) // OK and true
isEmptyArr(charSplice2) // OK and true
isEmptyArr(zeroSplice2) // OK and true
isEmptyArr(negSplice2) // OK and true
86 changes: 86 additions & 0 deletions tests/baselines/reference/arraySpliceParamDescription.js
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//// [tests/cases/compiler/arraySpliceParamDescription.ts] ////

//// [arraySpliceParamDescription.ts]
// @target es5

export function isEmptyArr(l: { length: number }) {
return l.length === 0
}

var arrA : string[]
arrA = ["a", "b", "c", "d", "e", "f", "g"]

// deleteCount param: undefined | NaN | 0 | -int; no elements removed
var undefSplice1 = arrA.splice(2, undefined) // OK
var charSplice1 = arrA.splice(2, "a") // expect error
var naNSplice1 = arrA.splice(2, NaN) // OK
var zeroSplice1 = arrA.splice(2, 0) // OK
var negSplice1 = arrA.splice(2, -2) // OK and expect arrA = ["a", "b", "c", "d", "e", "f", "g"]

// deleteCount param omitted; All elements after start param are removed
var omitSplice1 = arrA.splice(2,) // OK expect arrA = ["a", "b"]

// testing the splice arrays are empty
isEmptyArr(undefSplice1) // OK and true
isEmptyArr(charSplice1) // OK and true
isEmptyArr(naNSplice1) // OK and true
isEmptyArr(zeroSplice1) // OK and true
isEmptyArr(negSplice1) // OK and true
isEmptyArr(omitSplice1) // OK and false. length of removed elements is 5

var arrB : string[]
arrB = ["a", "b", "c", "d", "e", "f", "g"]

var undefSplice2 = arrB.splice(2, undefined, "h", "i") // expect error and arrB = ["a", "b", "h", "i", "e", "f", "g"]
var omitSplice2 = arrB.splice(2, , "j", "k") // expect error and arrB = ["a", "b", "j", "k", "e", "f", "g"]
var naNSplice2 = arrB.splice(2, NaN, "l", "m") // OK and arrB = ["a", "b", "l", "m", "e", "f", "g"]
var charSplice2 = arrB.splice(2, "a", "n", "o") // expect error and arrB = ["a", "b", "n", "o", "e", "f", "g"]
var zeroSplice2 = arrB.splice(2, 0, "p", "q") // OK and arrB = ["a", "b", "p", "q", "e", "f", "g"]
var negSplice2 = arrB.splice(2, -2, "r", "s") // OK and arrB = ["a", "b", "r", "s", "e", "f", "g"]

isEmptyArr(undefSplice2) // OK and true
isEmptyArr(omitSplice2) // OK and true
isEmptyArr(naNSplice2) // OK and true
isEmptyArr(charSplice2) // OK and true
isEmptyArr(zeroSplice2) // OK and true
isEmptyArr(negSplice2) // OK and true

//// [arraySpliceParamDescription.js]
"use strict";
// @target es5
Object.defineProperty(exports, "__esModule", { value: true });
exports.isEmptyArr = isEmptyArr;
function isEmptyArr(l) {
return l.length === 0;
}
var arrA;
arrA = ["a", "b", "c", "d", "e", "f", "g"];
// deleteCount param: undefined | NaN | 0 | -int; no elements removed
var undefSplice1 = arrA.splice(2, undefined); // OK
var charSplice1 = arrA.splice(2, "a"); // expect error
var naNSplice1 = arrA.splice(2, NaN); // OK
var zeroSplice1 = arrA.splice(2, 0); // OK
var negSplice1 = arrA.splice(2, -2); // OK and expect arrA = ["a", "b", "c", "d", "e", "f", "g"]
// deleteCount param omitted; All elements after start param are removed
var omitSplice1 = arrA.splice(2); // OK expect arrA = ["a", "b"]
// testing the splice arrays are empty
isEmptyArr(undefSplice1); // OK and true
isEmptyArr(charSplice1); // OK and true
isEmptyArr(naNSplice1); // OK and true
isEmptyArr(zeroSplice1); // OK and true
isEmptyArr(negSplice1); // OK and true
isEmptyArr(omitSplice1); // OK and false. length of removed elements is 5
var arrB;
arrB = ["a", "b", "c", "d", "e", "f", "g"];
var undefSplice2 = arrB.splice(2, undefined, "h", "i"); // expect error and arrB = ["a", "b", "h", "i", "e", "f", "g"]
var omitSplice2 = arrB.splice(2, "j", "k"); // expect error and arrB = ["a", "b", "j", "k", "e", "f", "g"]
var naNSplice2 = arrB.splice(2, NaN, "l", "m"); // OK and arrB = ["a", "b", "l", "m", "e", "f", "g"]
var charSplice2 = arrB.splice(2, "a", "n", "o"); // expect error and arrB = ["a", "b", "n", "o", "e", "f", "g"]
var zeroSplice2 = arrB.splice(2, 0, "p", "q"); // OK and arrB = ["a", "b", "p", "q", "e", "f", "g"]
var negSplice2 = arrB.splice(2, -2, "r", "s"); // OK and arrB = ["a", "b", "r", "s", "e", "f", "g"]
isEmptyArr(undefSplice2); // OK and true
isEmptyArr(omitSplice2); // OK and true
isEmptyArr(naNSplice2); // OK and true
isEmptyArr(charSplice2); // OK and true
isEmptyArr(zeroSplice2); // OK and true
isEmptyArr(negSplice2); // OK and true
155 changes: 155 additions & 0 deletions tests/baselines/reference/arraySpliceParamDescription.symbols
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//// [tests/cases/compiler/arraySpliceParamDescription.ts] ////

=== arraySpliceParamDescription.ts ===
// @target es5

export function isEmptyArr(l: { length: number }) {
>isEmptyArr : Symbol(isEmptyArr, Decl(arraySpliceParamDescription.ts, 0, 0))
>l : Symbol(l, Decl(arraySpliceParamDescription.ts, 2, 27))
>length : Symbol(length, Decl(arraySpliceParamDescription.ts, 2, 31))

return l.length === 0
>l.length : Symbol(length, Decl(arraySpliceParamDescription.ts, 2, 31))
>l : Symbol(l, Decl(arraySpliceParamDescription.ts, 2, 27))
>length : Symbol(length, Decl(arraySpliceParamDescription.ts, 2, 31))
}

var arrA : string[]
>arrA : Symbol(arrA, Decl(arraySpliceParamDescription.ts, 6, 3))

arrA = ["a", "b", "c", "d", "e", "f", "g"]
>arrA : Symbol(arrA, Decl(arraySpliceParamDescription.ts, 6, 3))

// deleteCount param: undefined | NaN | 0 | -int; no elements removed
var undefSplice1 = arrA.splice(2, undefined) // OK
>undefSplice1 : Symbol(undefSplice1, Decl(arraySpliceParamDescription.ts, 10, 3))
>arrA.splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
>arrA : Symbol(arrA, Decl(arraySpliceParamDescription.ts, 6, 3))
>splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
>undefined : Symbol(undefined)

var charSplice1 = arrA.splice(2, "a") // expect error
>charSplice1 : Symbol(charSplice1, Decl(arraySpliceParamDescription.ts, 11, 3))
>arrA.splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
>arrA : Symbol(arrA, Decl(arraySpliceParamDescription.ts, 6, 3))
>splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))

var naNSplice1 = arrA.splice(2, NaN) // OK
>naNSplice1 : Symbol(naNSplice1, Decl(arraySpliceParamDescription.ts, 12, 3))
>arrA.splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
>arrA : Symbol(arrA, Decl(arraySpliceParamDescription.ts, 6, 3))
>splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
>NaN : Symbol(NaN, Decl(lib.es5.d.ts, --, --))

var zeroSplice1 = arrA.splice(2, 0) // OK
>zeroSplice1 : Symbol(zeroSplice1, Decl(arraySpliceParamDescription.ts, 13, 3))
>arrA.splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
>arrA : Symbol(arrA, Decl(arraySpliceParamDescription.ts, 6, 3))
>splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))

var negSplice1 = arrA.splice(2, -2) // OK and expect arrA = ["a", "b", "c", "d", "e", "f", "g"]
>negSplice1 : Symbol(negSplice1, Decl(arraySpliceParamDescription.ts, 14, 3))
>arrA.splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
>arrA : Symbol(arrA, Decl(arraySpliceParamDescription.ts, 6, 3))
>splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))

// deleteCount param omitted; All elements after start param are removed
var omitSplice1 = arrA.splice(2,) // OK expect arrA = ["a", "b"]
>omitSplice1 : Symbol(omitSplice1, Decl(arraySpliceParamDescription.ts, 17, 3))
>arrA.splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
>arrA : Symbol(arrA, Decl(arraySpliceParamDescription.ts, 6, 3))
>splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))

// testing the splice arrays are empty
isEmptyArr(undefSplice1) // OK and true
>isEmptyArr : Symbol(isEmptyArr, Decl(arraySpliceParamDescription.ts, 0, 0))
>undefSplice1 : Symbol(undefSplice1, Decl(arraySpliceParamDescription.ts, 10, 3))

isEmptyArr(charSplice1) // OK and true
>isEmptyArr : Symbol(isEmptyArr, Decl(arraySpliceParamDescription.ts, 0, 0))
>charSplice1 : Symbol(charSplice1, Decl(arraySpliceParamDescription.ts, 11, 3))

isEmptyArr(naNSplice1) // OK and true
>isEmptyArr : Symbol(isEmptyArr, Decl(arraySpliceParamDescription.ts, 0, 0))
>naNSplice1 : Symbol(naNSplice1, Decl(arraySpliceParamDescription.ts, 12, 3))

isEmptyArr(zeroSplice1) // OK and true
>isEmptyArr : Symbol(isEmptyArr, Decl(arraySpliceParamDescription.ts, 0, 0))
>zeroSplice1 : Symbol(zeroSplice1, Decl(arraySpliceParamDescription.ts, 13, 3))

isEmptyArr(negSplice1) // OK and true
>isEmptyArr : Symbol(isEmptyArr, Decl(arraySpliceParamDescription.ts, 0, 0))
>negSplice1 : Symbol(negSplice1, Decl(arraySpliceParamDescription.ts, 14, 3))

isEmptyArr(omitSplice1) // OK and false. length of removed elements is 5
>isEmptyArr : Symbol(isEmptyArr, Decl(arraySpliceParamDescription.ts, 0, 0))
>omitSplice1 : Symbol(omitSplice1, Decl(arraySpliceParamDescription.ts, 17, 3))

var arrB : string[]
>arrB : Symbol(arrB, Decl(arraySpliceParamDescription.ts, 27, 3))

arrB = ["a", "b", "c", "d", "e", "f", "g"]
>arrB : Symbol(arrB, Decl(arraySpliceParamDescription.ts, 27, 3))

var undefSplice2 = arrB.splice(2, undefined, "h", "i") // expect error and arrB = ["a", "b", "h", "i", "e", "f", "g"]
>undefSplice2 : Symbol(undefSplice2, Decl(arraySpliceParamDescription.ts, 30, 3))
>arrB.splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
>arrB : Symbol(arrB, Decl(arraySpliceParamDescription.ts, 27, 3))
>splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
>undefined : Symbol(undefined)

var omitSplice2 = arrB.splice(2, , "j", "k") // expect error and arrB = ["a", "b", "j", "k", "e", "f", "g"]
>omitSplice2 : Symbol(omitSplice2, Decl(arraySpliceParamDescription.ts, 31, 3))
>arrB.splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
>arrB : Symbol(arrB, Decl(arraySpliceParamDescription.ts, 27, 3))
>splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))

var naNSplice2 = arrB.splice(2, NaN, "l", "m") // OK and arrB = ["a", "b", "l", "m", "e", "f", "g"]
>naNSplice2 : Symbol(naNSplice2, Decl(arraySpliceParamDescription.ts, 32, 3))
>arrB.splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
>arrB : Symbol(arrB, Decl(arraySpliceParamDescription.ts, 27, 3))
>splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
>NaN : Symbol(NaN, Decl(lib.es5.d.ts, --, --))

var charSplice2 = arrB.splice(2, "a", "n", "o") // expect error and arrB = ["a", "b", "n", "o", "e", "f", "g"]
>charSplice2 : Symbol(charSplice2, Decl(arraySpliceParamDescription.ts, 33, 3))
>arrB.splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
>arrB : Symbol(arrB, Decl(arraySpliceParamDescription.ts, 27, 3))
>splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))

var zeroSplice2 = arrB.splice(2, 0, "p", "q") // OK and arrB = ["a", "b", "p", "q", "e", "f", "g"]
>zeroSplice2 : Symbol(zeroSplice2, Decl(arraySpliceParamDescription.ts, 34, 3))
>arrB.splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
>arrB : Symbol(arrB, Decl(arraySpliceParamDescription.ts, 27, 3))
>splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))

var negSplice2 = arrB.splice(2, -2, "r", "s") // OK and arrB = ["a", "b", "r", "s", "e", "f", "g"]
>negSplice2 : Symbol(negSplice2, Decl(arraySpliceParamDescription.ts, 35, 3))
>arrB.splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
>arrB : Symbol(arrB, Decl(arraySpliceParamDescription.ts, 27, 3))
>splice : Symbol(Array.splice, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))

isEmptyArr(undefSplice2) // OK and true
>isEmptyArr : Symbol(isEmptyArr, Decl(arraySpliceParamDescription.ts, 0, 0))
>undefSplice2 : Symbol(undefSplice2, Decl(arraySpliceParamDescription.ts, 30, 3))

isEmptyArr(omitSplice2) // OK and true
>isEmptyArr : Symbol(isEmptyArr, Decl(arraySpliceParamDescription.ts, 0, 0))
>omitSplice2 : Symbol(omitSplice2, Decl(arraySpliceParamDescription.ts, 31, 3))

isEmptyArr(naNSplice2) // OK and true
>isEmptyArr : Symbol(isEmptyArr, Decl(arraySpliceParamDescription.ts, 0, 0))
>naNSplice2 : Symbol(naNSplice2, Decl(arraySpliceParamDescription.ts, 32, 3))

isEmptyArr(charSplice2) // OK and true
>isEmptyArr : Symbol(isEmptyArr, Decl(arraySpliceParamDescription.ts, 0, 0))
>charSplice2 : Symbol(charSplice2, Decl(arraySpliceParamDescription.ts, 33, 3))

isEmptyArr(zeroSplice2) // OK and true
>isEmptyArr : Symbol(isEmptyArr, Decl(arraySpliceParamDescription.ts, 0, 0))
>zeroSplice2 : Symbol(zeroSplice2, Decl(arraySpliceParamDescription.ts, 34, 3))

isEmptyArr(negSplice2) // OK and true
>isEmptyArr : Symbol(isEmptyArr, Decl(arraySpliceParamDescription.ts, 0, 0))
>negSplice2 : Symbol(negSplice2, Decl(arraySpliceParamDescription.ts, 35, 3))

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