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tests/cases/conformance/types/rest/genericRestParameters3.ts(17,11): error TS2345: Argument of type '[10]' is not assignable to parameter of type '[string] | [number, boolean]'.
Type '[10]' is not assignable to type '[string]'.
Type 'number' is not assignable to type 'string'.
tests/cases/conformance/types/rest/genericRestParameters3.ts(18,1): error TS2345: Argument of type '[]' is not assignable to parameter of type '[string] | [number, boolean]'.
Type '[]' is not assignable to type '[number, boolean]'.
Source has 0 element(s) but target requires 2.
tests/cases/conformance/types/rest/genericRestParameters3.ts(23,1): error TS2322: Type '(x: string, y: string) => void' is not assignable to type '(x: string, ...args: [string] | [number, boolean]) => void'.
Types of parameters 'y' and 'args' are incompatible.
Type '[string] | [number, boolean]' is not assignable to type '[y: string]'.
Type '[number, boolean]' is not assignable to type '[y: string]'.
Source has 2 element(s) but target allows only 1.
tests/cases/conformance/types/rest/genericRestParameters3.ts(24,1): error TS2322: Type '(x: string, y: number, z: boolean) => void' is not assignable to type '(x: string, ...args: [string] | [number, boolean]) => void'.
Types of parameters 'y' and 'args' are incompatible.
Type '[string] | [number, boolean]' is not assignable to type '[y: number, z: boolean]'.
Type '[string]' is not assignable to type '[y: number, z: boolean]'.
Source has 1 element(s) but target requires 2.
tests/cases/conformance/types/rest/genericRestParameters3.ts(35,1): error TS2554: Expected 1 arguments, but got 0.
tests/cases/conformance/types/rest/genericRestParameters3.ts(36,21): error TS2345: Argument of type 'number' is not assignable to parameter of type '(...args: CoolArray<any>) => void'.
tests/cases/conformance/types/rest/genericRestParameters3.ts(37,21): error TS2345: Argument of type '<T extends any[]>(cb: (...args: T) => void) => void' is not assignable to parameter of type '(...args: CoolArray<any>) => void'.
Types of parameters 'cb' and 'args' are incompatible.
Property '0' is missing in type 'CoolArray<any>' but required in type '[cb: (...args: any[]) => void]'.
tests/cases/conformance/types/rest/genericRestParameters3.ts(44,32): error TS2345: Argument of type '[10, 20]' is not assignable to parameter of type 'CoolArray<number>'.
Property 'hello' is missing in type '[10, 20]' but required in type 'CoolArray<number>'.
tests/cases/conformance/types/rest/genericRestParameters3.ts(49,1): error TS2345: Argument of type '[]' is not assignable to parameter of type 'CoolArray<never>'.
Property 'hello' is missing in type '[]' but required in type 'CoolArray<never>'.
tests/cases/conformance/types/rest/genericRestParameters3.ts(50,5): error TS2345: Argument of type '[number]' is not assignable to parameter of type 'CoolArray<unknown>'.
Property 'hello' is missing in type '[number]' but required in type 'CoolArray<unknown>'.
tests/cases/conformance/types/rest/genericRestParameters3.ts(51,5): error TS2345: Argument of type '[number, number]' is not assignable to parameter of type 'CoolArray<unknown>'.
Property 'hello' is missing in type '[number, number]' but required in type 'CoolArray<unknown>'.
tests/cases/conformance/types/rest/genericRestParameters3.ts(52,5): error TS2345: Argument of type 'number[]' is not assignable to parameter of type 'CoolArray<number>'.
Property 'hello' is missing in type 'number[]' but required in type 'CoolArray<number>'.
tests/cases/conformance/types/rest/genericRestParameters3.ts(59,5): error TS2345: Argument of type '["what"]' is not assignable to parameter of type '[] | [number, string]'.
Type '["what"]' is not assignable to type '[number, string]'.
Source has 1 element(s) but target requires 2.
==== tests/cases/conformance/types/rest/genericRestParameters3.ts (13 errors) ====
declare let f1: (x: string, ...args: [string] | [number, boolean]) => void;
declare let f2: (x: string, y: string) => void;
declare let f3: (x: string, y: number, z: boolean) => void;
declare let f4: (...args: [string, string] | [string, number, boolean]) => void;
declare const t1: [string] | [number, boolean];
declare const t2: readonly [string] | [number, boolean];
declare const t3: [string] | readonly [number, boolean];
declare const t4: readonly [string] | readonly [number, boolean];
f1("foo", "abc");
f1("foo", 10, true);
f1("foo", ...t1);
f1("foo", ...t2);
f1("foo", ...t3);
f1("foo", ...t4);
f1("foo", 10); // Error
~~
!!! error TS2345: Argument of type '[10]' is not assignable to parameter of type '[string] | [number, boolean]'.
!!! error TS2345: Type '[10]' is not assignable to type '[string]'.
!!! error TS2345: Type 'number' is not assignable to type 'string'.
f1("foo"); // Error
~~~~~~~~~
!!! error TS2345: Argument of type '[]' is not assignable to parameter of type '[string] | [number, boolean]'.
!!! error TS2345: Type '[]' is not assignable to type '[number, boolean]'.
!!! error TS2345: Source has 0 element(s) but target requires 2.
f2 = f1;
f3 = f1;
f4 = f1;
f1 = f2; // Error
~~
!!! error TS2322: Type '(x: string, y: string) => void' is not assignable to type '(x: string, ...args: [string] | [number, boolean]) => void'.
!!! error TS2322: Types of parameters 'y' and 'args' are incompatible.
!!! error TS2322: Type '[string] | [number, boolean]' is not assignable to type '[y: string]'.
!!! error TS2322: Type '[number, boolean]' is not assignable to type '[y: string]'.
!!! error TS2322: Source has 2 element(s) but target allows only 1.
f1 = f3; // Error
~~
!!! error TS2322: Type '(x: string, y: number, z: boolean) => void' is not assignable to type '(x: string, ...args: [string] | [number, boolean]) => void'.
!!! error TS2322: Types of parameters 'y' and 'args' are incompatible.
!!! error TS2322: Type '[string] | [number, boolean]' is not assignable to type '[y: number, z: boolean]'.
!!! error TS2322: Type '[string]' is not assignable to type '[y: number, z: boolean]'.
!!! error TS2322: Source has 1 element(s) but target requires 2.
f1 = f4;
// Repro from #26110
interface CoolArray<E> extends Array<E> {
hello: number;
}
declare function foo<T extends any[]>(cb: (...args: T) => void): void;
foo<CoolArray<any>>(); // Error
~~~~~~~~~~~~~~~~~~~~~
!!! error TS2554: Expected 1 arguments, but got 0.
!!! related TS6210 tests/cases/conformance/types/rest/genericRestParameters3.ts:33:39: An argument for 'cb' was not provided.
foo<CoolArray<any>>(100); // Error
~~~
!!! error TS2345: Argument of type 'number' is not assignable to parameter of type '(...args: CoolArray<any>) => void'.
foo<CoolArray<any>>(foo); // Error
~~~
!!! error TS2345: Argument of type '<T extends any[]>(cb: (...args: T) => void) => void' is not assignable to parameter of type '(...args: CoolArray<any>) => void'.
!!! error TS2345: Types of parameters 'cb' and 'args' are incompatible.
!!! error TS2345: Property '0' is missing in type 'CoolArray<any>' but required in type '[cb: (...args: any[]) => void]'.
function bar<T extends any[]>(...args: T): T {
return args;
}
let a = bar(10, 20);
let b = bar<CoolArray<number>>(10, 20); // Error
~~~~~~
!!! error TS2345: Argument of type '[10, 20]' is not assignable to parameter of type 'CoolArray<number>'.
!!! error TS2345: Property 'hello' is missing in type '[10, 20]' but required in type 'CoolArray<number>'.
!!! related TS2728 tests/cases/conformance/types/rest/genericRestParameters3.ts:30:5: 'hello' is declared here.
declare function baz<T>(...args: CoolArray<T>): void;
declare const ca: CoolArray<number>;
baz(); // Error
~~~~~
!!! error TS2345: Argument of type '[]' is not assignable to parameter of type 'CoolArray<never>'.
!!! error TS2345: Property 'hello' is missing in type '[]' but required in type 'CoolArray<never>'.
!!! related TS2728 tests/cases/conformance/types/rest/genericRestParameters3.ts:30:5: 'hello' is declared here.
baz(1); // Error
~
!!! error TS2345: Argument of type '[number]' is not assignable to parameter of type 'CoolArray<unknown>'.
!!! error TS2345: Property 'hello' is missing in type '[number]' but required in type 'CoolArray<unknown>'.
!!! related TS2728 tests/cases/conformance/types/rest/genericRestParameters3.ts:30:5: 'hello' is declared here.
baz(1, 2); // Error
~~~~
!!! error TS2345: Argument of type '[number, number]' is not assignable to parameter of type 'CoolArray<unknown>'.
!!! error TS2345: Property 'hello' is missing in type '[number, number]' but required in type 'CoolArray<unknown>'.
!!! related TS2728 tests/cases/conformance/types/rest/genericRestParameters3.ts:30:5: 'hello' is declared here.
baz(...ca); // Error
~~~~~
!!! error TS2345: Argument of type 'number[]' is not assignable to parameter of type 'CoolArray<number>'.
!!! error TS2345: Property 'hello' is missing in type 'number[]' but required in type 'CoolArray<number>'.
!!! related TS2728 tests/cases/conformance/types/rest/genericRestParameters3.ts:30:5: 'hello' is declared here.
// Repro from #26491
declare function hmm<A extends [] | [number, string]>(...args: A): void;
hmm(); // okay, A = []
hmm(1, "s"); // okay, A = [1, "s"]
hmm("what"); // no error? A = [] | [number, string] ?
~~~~~~
!!! error TS2345: Argument of type '["what"]' is not assignable to parameter of type '[] | [number, string]'.
!!! error TS2345: Type '["what"]' is not assignable to type '[number, string]'.
!!! error TS2345: Source has 1 element(s) but target requires 2.
// Repro from #35066
declare function foo2(...args: string[] | number[]): void;
let x2: ReadonlyArray<string> = ["hello"];
foo2(...x2);
// Repros from #47754
type RestParams = [y: string] | [y: number];
type Signature = (x: string, ...rest: RestParams) => void;
type MergedParams = Parameters<Signature>; // [x: string, y: string] | [x: string, y: number]
declare let ff1: (...rest: [string, string] | [string, number]) => void;
declare let ff2: (x: string, ...rest: [string] | [number]) => void;
ff1 = ff2;
ff2 = ff1;
function ff3<A extends unknown[]>(s1: (...args: [x: string, ...rest: A | [number]]) => void, s2: (x: string, ...rest: A | [number]) => void) {
s1 = s2;
s2 = s1;
}
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