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tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(4,5): error TS2322: Type 'string' is not assignable to type 'number'.
tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(6,5): error TS2322: Type '2' is not assignable to type '0 | 1'.
tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(7,5): error TS2322: Type '"x"' is not assignable to type '0 | 1'.
tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(8,5): error TS2322: Type 'number' is not assignable to type 'never'.
tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(9,5): error TS2322: Type 'number' is not assignable to type 'never'.
tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(10,5): error TS2322: Type 'string' is not assignable to type 'never'.
tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(14,5): error TS2739: Type '{ [key: string]: number; }' is missing the following properties from type '{ x: number; y: number; }': x, y
tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(15,5): error TS2322: Type 'T' is not assignable to type '{ x: number; y: number; }'.
Type '{ [key: string]: number; }' is missing the following properties from type '{ x: number; y: number; }': x, y
tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(18,5): error TS2322: Type '{ x: number; y: number; }' is not assignable to type 'T'.
'{ x: number; y: number; }' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint '{ [key: string]: number; }'.
tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(19,5): error TS2322: Type '{ [key: string]: number; }' is not assignable to type 'T'.
'{ [key: string]: number; }' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint '{ [key: string]: number; }'.
tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(26,7): error TS2339: Property 'x' does not exist on type 'T'.
tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(27,5): error TS2322: Type 'number' is not assignable to type 'T[keyof T]'.
'number' is assignable to the constraint of type 'T[keyof T]', but 'T[keyof T]' could be instantiated with a different subtype of constraint 'number'.
tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(31,5): error TS2322: Type '{ [key: string]: number; }' is not assignable to type '{ [P in K]: number; }'.
tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(38,5): error TS2322: Type '{ [x: string]: number; }' is not assignable to type '{ [P in K]: number; }'.
tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(50,3): error TS7053: Element implicitly has an 'any' type because expression of type 'string' can't be used to index type 'Item'.
No index signature with a parameter of type 'string' was found on type 'Item'.
tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(51,3): error TS2322: Type 'number' is not assignable to type 'never'.
tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(52,3): error TS2322: Type 'number' is not assignable to type 'T[keyof T]'.
'T[keyof T]' could be instantiated with an arbitrary type which could be unrelated to 'number'.
tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(53,3): error TS2322: Type 'number' is not assignable to type 'T[K]'.
'T[K]' could be instantiated with an arbitrary type which could be unrelated to 'number'.
tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(65,7): error TS2339: Property 'foo' does not exist on type 'T'.
tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(66,3): error TS2536: Type 'string' cannot be used to index type 'T'.
tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(67,3): error TS2322: Type 'number' is not assignable to type 'T[keyof T]'.
'number' is assignable to the constraint of type 'T[keyof T]', but 'T[keyof T]' could be instantiated with a different subtype of constraint 'number'.
tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(68,3): error TS2322: Type 'number' is not assignable to type 'T[K]'.
'number' is assignable to the constraint of type 'T[K]', but 'T[K]' could be instantiated with a different subtype of constraint 'number'.
tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts(108,5): error TS2322: Type '123' is not assignable to type 'Type[K]'.
Type 'number' is not assignable to type 'never'.
==== tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts (23 errors) ====
function f1(obj: { a: number, b: 0 | 1, c: string }, k0: 'a', k1: 'a' | 'b', k2: 'a' | 'b' | 'c') {
obj[k0] = 1;
obj[k0] = 2;
obj[k0] = 'x'; // Error
~~~~~~~
!!! error TS2322: Type 'string' is not assignable to type 'number'.
obj[k1] = 1;
obj[k1] = 2; // Error
~~~~~~~
!!! error TS2322: Type '2' is not assignable to type '0 | 1'.
obj[k1] = 'x'; // Error
~~~~~~~
!!! error TS2322: Type '"x"' is not assignable to type '0 | 1'.
obj[k2] = 1; // Error
~~~~~~~
!!! error TS2322: Type 'number' is not assignable to type 'never'.
obj[k2] = 2; // Error
~~~~~~~
!!! error TS2322: Type 'number' is not assignable to type 'never'.
obj[k2] = 'x'; // Error
~~~~~~~
!!! error TS2322: Type 'string' is not assignable to type 'never'.
}
function f2<T extends { [key: string]: number }>(a: { x: number, y: number }, b: { [key: string]: number }, c: T, k: keyof T) {
a = b; // Error, index signature in source doesn't imply properties are present
~
!!! error TS2739: Type '{ [key: string]: number; }' is missing the following properties from type '{ x: number; y: number; }': x, y
a = c; // Error, index signature in source doesn't imply properties are present
~
!!! error TS2322: Type 'T' is not assignable to type '{ x: number; y: number; }'.
!!! error TS2322: Type '{ [key: string]: number; }' is missing the following properties from type '{ x: number; y: number; }': x, y
b = a;
b = c;
c = a; // Error, constraint on target doesn't imply any properties or signatures
~
!!! error TS2322: Type '{ x: number; y: number; }' is not assignable to type 'T'.
!!! error TS2322: '{ x: number; y: number; }' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint '{ [key: string]: number; }'.
c = b; // Error, constraint on target doesn't imply any properties or signatures
~
!!! error TS2322: Type '{ [key: string]: number; }' is not assignable to type 'T'.
!!! error TS2322: '{ [key: string]: number; }' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint '{ [key: string]: number; }'.
a.x;
b.x;
c.x;
c[k];
a.x = 1;
b.x = 1;
c.x = 1; // Error, cannot write to index signature through constraint
~
!!! error TS2339: Property 'x' does not exist on type 'T'.
c[k] = 1; // Error, cannot write to index signature through constraint
~~~~
!!! error TS2322: Type 'number' is not assignable to type 'T[keyof T]'.
!!! error TS2322: 'number' is assignable to the constraint of type 'T[keyof T]', but 'T[keyof T]' could be instantiated with a different subtype of constraint 'number'.
}
function f3<K extends string>(a: { [P in K]: number }, b: { [key: string]: number }, k: K) {
a = b; // Error, index signature doesn't imply properties are present
~
!!! error TS2322: Type '{ [key: string]: number; }' is not assignable to type '{ [P in K]: number; }'.
b = a;
a[k];
a[k] = 1;
}
function f3b<K extends string>(a: { [P in K]: number }, b: { [P in string]: number }, k: K) {
a = b; // Error, index signature doesn't imply properties are present
~
!!! error TS2322: Type '{ [x: string]: number; }' is not assignable to type '{ [P in K]: number; }'.
b = a;
}
function f4<K extends string>(a: { [key: string]: number }[K], b: number) {
a = b;
b = a;
}
type Item = { a: string, b: number };
function f10<T extends Item, K extends keyof T>(obj: T, k1: string, k2: keyof Item, k3: keyof T, k4: K) {
obj[k1] = 123; // Error
~~~~~~~
!!! error TS7053: Element implicitly has an 'any' type because expression of type 'string' can't be used to index type 'Item'.
!!! error TS7053: No index signature with a parameter of type 'string' was found on type 'Item'.
obj[k2] = 123; // Error
~~~~~~~
!!! error TS2322: Type 'number' is not assignable to type 'never'.
obj[k3] = 123; // Error
~~~~~~~
!!! error TS2322: Type 'number' is not assignable to type 'T[keyof T]'.
!!! error TS2322: 'T[keyof T]' could be instantiated with an arbitrary type which could be unrelated to 'number'.
obj[k4] = 123; // Error
~~~~~~~
!!! error TS2322: Type 'number' is not assignable to type 'T[K]'.
!!! error TS2322: 'T[K]' could be instantiated with an arbitrary type which could be unrelated to 'number'.
}
type Dict = Record<string, number>;
function f11<K extends keyof Dict>(obj: Dict, k1: keyof Dict, k2: K) {
obj.foo = 123;
obj[k1] = 123;
obj[k2] = 123;
}
function f12<T extends Readonly<Dict>, K extends keyof T>(obj: T, k1: keyof Dict, k2: keyof T, k3: K) {
obj.foo = 123; // Error
~~~
!!! error TS2339: Property 'foo' does not exist on type 'T'.
obj[k1] = 123; // Error
~~~~~~~
!!! error TS2536: Type 'string' cannot be used to index type 'T'.
obj[k2] = 123; // Error
~~~~~~~
!!! error TS2322: Type 'number' is not assignable to type 'T[keyof T]'.
!!! error TS2322: 'number' is assignable to the constraint of type 'T[keyof T]', but 'T[keyof T]' could be instantiated with a different subtype of constraint 'number'.
obj[k3] = 123; // Error
~~~~~~~
!!! error TS2322: Type 'number' is not assignable to type 'T[K]'.
!!! error TS2322: 'number' is assignable to the constraint of type 'T[K]', but 'T[K]' could be instantiated with a different subtype of constraint 'number'.
}
// Repro from #27895
export interface Entity {
id: number | string;
}
export type IdOf<E extends Entity> = E['id'];
export interface EntityState<E extends Entity> {
ids: IdOf<E>[];
entities: { [key: string]: E, [key: number]: E };
}
export function getAllEntities<E extends Entity>(state: EntityState<E>): E[] {
const { ids, entities } = state;
return ids.map(id => entities[id]);
}
export function getEntity<E extends Entity>(id: IdOf<E>, state: EntityState<E>): E | undefined {
const { ids, entities } = state;
if (!ids.includes(id)) {
return undefined;
}
return entities[id];
}
// Repro from #30603
interface Type {
a: 123;
b: "some string";
}
function get123<K extends keyof Type>(): Type[K] {
return 123; // Error
~~~~~~~~~~~
!!! error TS2322: Type '123' is not assignable to type 'Type[K]'.
!!! error TS2322: Type 'number' is not assignable to type 'never'.
}
// Repro from #30920
type StrictExtract<T, U> = T extends U ? U extends T ? T : never : never;
type StrictExclude<T, U> = T extends StrictExtract<T, U> ? never : T;
type A<T> = { [Q in { [P in keyof T]: P; }[keyof T]]: T[Q]; };
type B<T, V> = A<{ [Q in keyof T]: StrictExclude<B<T[Q], V>, {}>; }>;
// Repros from #30938
function fn<T extends {elements: Array<string>} | {elements: Array<number>}>(param: T, cb: (element: T['elements'][number]) => void) {
cb(param.elements[0]);
}
function fn2<T extends Array<string>>(param: T, cb: (element: T[number]) => void) {
cb(param[0]);
}
// Repro from #31149
function fn3<T extends ReadonlyArray<string>>(param: T, cb: (element: T[number]) => void) {
cb(param[0]);
}
function fn4<K extends number>() {
let x: Array<string>[K] = 'abc';
let y: ReadonlyArray<string>[K] = 'abc';
}
// Repro from #31439 and #31691
export class c {
[x: string]: string;
constructor() {
this.a = "b";
this["a"] = "b";
}
}
// Repro from #31385
type Foo<T> = { [key: string]: { [K in keyof T]: K }[keyof T] };
type Bar<T> = { [key: string]: { [K in keyof T]: [K] }[keyof T] };
type Baz<T, Q extends Foo<T>> = { [K in keyof Q]: T[Q[K]] };
type Qux<T, Q extends Bar<T>> = { [K in keyof Q]: T[Q[K]["0"]] };
// Repro from #32038
const actions = ['resizeTo', 'resizeBy'] as const;
for (const action of actions) {
window[action] = (x, y) => {
window[action](x, y);
}
}
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