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TypeScript/tests/baselines/reference/keyofAndIndexedAccess2.types
Anders Hejlsberg 15fae38b39
Improve narrowing of generic types in control flow analysis (#43183) 
* Narrow type variables with union constraints when merited by contextual type

* Narrow generics with union type constraints as indicated by contextual type

* Accept new baselines

* Add tests

* Fix circularity for JSX elements

* Remove unnecessary isConstraintPosition information from flow cache key

* Update comment

* Add additional tests

* Rename to getNarrowableTypeForReference, remove getConstraintForLocation

* Add comment

* Fix removal of undefined in destructurings with initializers

* Use getContextFreeTypeOfExpression in discriminateContextualTypeByObjectMembers

* In obj[x], use constraint of obj's type only when x's type is non-generic

* Add comment
2021-03-19 17:12:57 -07:00

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=== tests/cases/conformance/types/keyof/keyofAndIndexedAccess2.ts ===
function f1(obj: { a: number, b: 0 | 1, c: string }, k0: 'a', k1: 'a' | 'b', k2: 'a' | 'b' | 'c') {
>f1 : (obj: { a: number; b: 0 | 1; c: string;}, k0: 'a', k1: 'a' | 'b', k2: 'a' | 'b' | 'c') => void
>obj : { a: number; b: 0 | 1; c: string; }
>a : number
>b : 0 | 1
>c : string
>k0 : "a"
>k1 : "a" | "b"
>k2 : "a" | "b" | "c"
obj[k0] = 1;
>obj[k0] = 1 : 1
>obj[k0] : number
>obj : { a: number; b: 0 | 1; c: string; }
>k0 : "a"
>1 : 1
obj[k0] = 2;
>obj[k0] = 2 : 2
>obj[k0] : number
>obj : { a: number; b: 0 | 1; c: string; }
>k0 : "a"
>2 : 2
obj[k0] = 'x'; // Error
>obj[k0] = 'x' : "x"
>obj[k0] : number
>obj : { a: number; b: 0 | 1; c: string; }
>k0 : "a"
>'x' : "x"
obj[k1] = 1;
>obj[k1] = 1 : 1
>obj[k1] : 0 | 1
>obj : { a: number; b: 0 | 1; c: string; }
>k1 : "a" | "b"
>1 : 1
obj[k1] = 2; // Error
>obj[k1] = 2 : 2
>obj[k1] : 0 | 1
>obj : { a: number; b: 0 | 1; c: string; }
>k1 : "a" | "b"
>2 : 2
obj[k1] = 'x'; // Error
>obj[k1] = 'x' : "x"
>obj[k1] : 0 | 1
>obj : { a: number; b: 0 | 1; c: string; }
>k1 : "a" | "b"
>'x' : "x"
obj[k2] = 1; // Error
>obj[k2] = 1 : 1
>obj[k2] : never
>obj : { a: number; b: 0 | 1; c: string; }
>k2 : "a" | "b" | "c"
>1 : 1
obj[k2] = 2; // Error
>obj[k2] = 2 : 2
>obj[k2] : never
>obj : { a: number; b: 0 | 1; c: string; }
>k2 : "a" | "b" | "c"
>2 : 2
obj[k2] = 'x'; // Error
>obj[k2] = 'x' : "x"
>obj[k2] : never
>obj : { a: number; b: 0 | 1; c: string; }
>k2 : "a" | "b" | "c"
>'x' : "x"
}
function f2<T extends { [key: string]: number }>(a: { x: number, y: number }, b: { [key: string]: number }, c: T, k: keyof T) {
>f2 : <T extends { [key: string]: number; }>(a: { x: number; y: number;}, b: { [key: string]: number; }, c: T, k: keyof T) => void
>key : string
>a : { x: number; y: number; }
>x : number
>y : number
>b : { [key: string]: number; }
>key : string
>c : T
>k : keyof T
a = b; // Error, index signature in source doesn't imply properties are present
>a = b : { [key: string]: number; }
>a : { x: number; y: number; }
>b : { [key: string]: number; }
a = c; // Error, index signature in source doesn't imply properties are present
>a = c : T
>a : { x: number; y: number; }
>c : T
b = a;
>b = a : { x: number; y: number; }
>b : { [key: string]: number; }
>a : { x: number; y: number; }
b = c;
>b = c : T
>b : { [key: string]: number; }
>c : T
c = a; // Error, constraint on target doesn't imply any properties or signatures
>c = a : { x: number; y: number; }
>c : T
>a : { x: number; y: number; }
c = b; // Error, constraint on target doesn't imply any properties or signatures
>c = b : { [key: string]: number; }
>c : T
>b : { [key: string]: number; }
a.x;
>a.x : number
>a : { x: number; y: number; }
>x : number
b.x;
>b.x : number
>b : { [key: string]: number; }
>x : number
c.x;
>c.x : number
>c : T
>x : number
c[k];
>c[k] : T[keyof T]
>c : T
>k : keyof T
a.x = 1;
>a.x = 1 : 1
>a.x : number
>a : { x: number; y: number; }
>x : number
>1 : 1
b.x = 1;
>b.x = 1 : 1
>b.x : number
>b : { [key: string]: number; }
>x : number
>1 : 1
c.x = 1; // Error, cannot write to index signature through constraint
>c.x = 1 : 1
>c.x : any
>c : T
>x : any
>1 : 1
c[k] = 1; // Error, cannot write to index signature through constraint
>c[k] = 1 : 1
>c[k] : T[keyof T]
>c : T
>k : keyof T
>1 : 1
}
function f3<K extends string>(a: { [P in K]: number }, b: { [key: string]: number }, k: K) {
>f3 : <K extends string>(a: { [P in K]: number; }, b: { [key: string]: number; }, k: K) => void
>a : { [P in K]: number; }
>b : { [key: string]: number; }
>key : string
>k : K
a = b; // Error, index signature doesn't imply properties are present
>a = b : { [key: string]: number; }
>a : { [P in K]: number; }
>b : { [key: string]: number; }
b = a;
>b = a : { [P in K]: number; }
>b : { [key: string]: number; }
>a : { [P in K]: number; }
a[k];
>a[k] : { [P in K]: number; }[K]
>a : { [P in K]: number; }
>k : K
a[k] = 1;
>a[k] = 1 : 1
>a[k] : { [P in K]: number; }[K]
>a : { [P in K]: number; }
>k : K
>1 : 1
}
function f3b<K extends string>(a: { [P in K]: number }, b: { [P in string]: number }, k: K) {
>f3b : <K extends string>(a: { [P in K]: number; }, b: { [x: string]: number; }, k: K) => void
>a : { [P in K]: number; }
>b : { [x: string]: number; }
>k : K
a = b; // Error, index signature doesn't imply properties are present
>a = b : { [x: string]: number; }
>a : { [P in K]: number; }
>b : { [x: string]: number; }
b = a;
>b = a : { [P in K]: number; }
>b : { [x: string]: number; }
>a : { [P in K]: number; }
}
function f4<K extends string>(a: { [key: string]: number }[K], b: number) {
>f4 : <K extends string>(a: number, b: number) => void
>a : number
>key : string
>b : number
a = b;
>a = b : number
>a : number
>b : number
b = a;
>b = a : number
>b : number
>a : number
}
type Item = { a: string, b: number };
>Item : 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) {
>f10 : <T extends Item, K extends keyof T>(obj: T, k1: string, k2: keyof Item, k3: keyof T, k4: K) => void
>obj : T
>k1 : string
>k2 : keyof Item
>k3 : keyof T
>k4 : K
obj[k1] = 123; // Error
>obj[k1] = 123 : 123
>obj[k1] : any
>obj : T
>k1 : string
>123 : 123
obj[k2] = 123; // Error
>obj[k2] = 123 : 123
>obj[k2] : never
>obj : T
>k2 : keyof Item
>123 : 123
obj[k3] = 123; // Error
>obj[k3] = 123 : 123
>obj[k3] : T[keyof T]
>obj : T
>k3 : keyof T
>123 : 123
obj[k4] = 123; // Error
>obj[k4] = 123 : 123
>obj[k4] : T[K]
>obj : T
>k4 : K
>123 : 123
}
type Dict = Record<string, number>;
>Dict : Dict
function f11<K extends keyof Dict>(obj: Dict, k1: keyof Dict, k2: K) {
>f11 : <K extends string>(obj: Dict, k1: keyof Dict, k2: K) => void
>obj : Dict
>k1 : string
>k2 : K
obj.foo = 123;
>obj.foo = 123 : 123
>obj.foo : number
>obj : Dict
>foo : number
>123 : 123
obj[k1] = 123;
>obj[k1] = 123 : 123
>obj[k1] : number
>obj : Dict
>k1 : string
>123 : 123
obj[k2] = 123;
>obj[k2] = 123 : 123
>obj[k2] : number
>obj : Dict
>k2 : K
>123 : 123
}
function f12<T extends Readonly<Dict>, K extends keyof T>(obj: T, k1: keyof Dict, k2: keyof T, k3: K) {
>f12 : <T extends Readonly<Dict>, K extends keyof T>(obj: T, k1: keyof Dict, k2: keyof T, k3: K) => void
>obj : T
>k1 : string
>k2 : keyof T
>k3 : K
obj.foo = 123; // Error
>obj.foo = 123 : 123
>obj.foo : any
>obj : T
>foo : any
>123 : 123
obj[k1] = 123; // Error
>obj[k1] = 123 : 123
>obj[k1] : any
>obj : T
>k1 : string
>123 : 123
obj[k2] = 123; // Error
>obj[k2] = 123 : 123
>obj[k2] : T[keyof T]
>obj : T
>k2 : keyof T
>123 : 123
obj[k3] = 123; // Error
>obj[k3] = 123 : 123
>obj[k3] : T[K]
>obj : T
>k3 : K
>123 : 123
}
// Repro from #27895
export interface Entity {
id: number | string;
>id : string | number
}
export type IdOf<E extends Entity> = E['id'];
>IdOf : IdOf<E>
export interface EntityState<E extends Entity> {
ids: IdOf<E>[];
>ids : IdOf<E>[]
entities: { [key: string]: E, [key: number]: E };
>entities : { [key: string]: E; [key: number]: E; }
>key : string
>key : number
}
export function getAllEntities<E extends Entity>(state: EntityState<E>): E[] {
>getAllEntities : <E extends Entity>(state: EntityState<E>) => E[]
>state : EntityState<E>
const { ids, entities } = state;
>ids : IdOf<E>[]
>entities : { [key: string]: E; [key: number]: E; }
>state : EntityState<E>
return ids.map(id => entities[id]);
>ids.map(id => entities[id]) : { [key: string]: E; [key: number]: E; }[IdOf<E>][]
>ids.map : <U>(callbackfn: (value: IdOf<E>, index: number, array: IdOf<E>[]) => U, thisArg?: any) => U[]
>ids : IdOf<E>[]
>map : <U>(callbackfn: (value: IdOf<E>, index: number, array: IdOf<E>[]) => U, thisArg?: any) => U[]
>id => entities[id] : (id: IdOf<E>) => { [key: string]: E; [key: number]: E; }[IdOf<E>]
>id : IdOf<E>
>entities[id] : { [key: string]: E; [key: number]: E; }[IdOf<E>]
>entities : { [key: string]: E; [key: number]: E; }
>id : IdOf<E>
}
export function getEntity<E extends Entity>(id: IdOf<E>, state: EntityState<E>): E | undefined {
>getEntity : <E extends Entity>(id: IdOf<E>, state: EntityState<E>) => E | undefined
>id : IdOf<E>
>state : EntityState<E>
const { ids, entities } = state;
>ids : IdOf<E>[]
>entities : { [key: string]: E; [key: number]: E; }
>state : EntityState<E>
if (!ids.includes(id)) {
>!ids.includes(id) : boolean
>ids.includes(id) : boolean
>ids.includes : (searchElement: IdOf<E>, fromIndex?: number | undefined) => boolean
>ids : IdOf<E>[]
>includes : (searchElement: IdOf<E>, fromIndex?: number | undefined) => boolean
>id : IdOf<E>
return undefined;
>undefined : undefined
}
return entities[id];
>entities[id] : { [key: string]: E; [key: number]: E; }[IdOf<E>]
>entities : { [key: string]: E; [key: number]: E; }
>id : IdOf<E>
}
// Repro from #30603
interface Type {
a: 123;
>a : 123
b: "some string";
>b : "some string"
}
function get123<K extends keyof Type>(): Type[K] {
>get123 : <K extends keyof Type>() => Type[K]
return 123; // Error
>123 : 123
}
// Repro from #30920
type StrictExtract<T, U> = T extends U ? U extends T ? T : never : never;
>StrictExtract : StrictExtract<T, U>
type StrictExclude<T, U> = T extends StrictExtract<T, U> ? never : T;
>StrictExclude : StrictExclude<T, U>
type A<T> = { [Q in { [P in keyof T]: P; }[keyof T]]: T[Q]; };
>A : A<T>
type B<T, V> = A<{ [Q in keyof T]: StrictExclude<B<T[Q], V>, {}>; }>;
>B : B<T, V>
// Repros from #30938
function fn<T extends {elements: Array<string>} | {elements: Array<number>}>(param: T, cb: (element: T['elements'][number]) => void) {
>fn : <T extends { elements: Array<string>; } | { elements: Array<number>; }>(param: T, cb: (element: T['elements'][number]) => void) => void
>elements : string[]
>elements : number[]
>param : T
>cb : (element: T['elements'][number]) => void
>element : T["elements"][number]
cb(param.elements[0]);
>cb(param.elements[0]) : void
>cb : (element: T["elements"][number]) => void
>param.elements[0] : string | number
>param.elements : string[] | number[]
>param : { elements: string[]; } | { elements: number[]; }
>elements : string[] | number[]
>0 : 0
}
function fn2<T extends Array<string>>(param: T, cb: (element: T[number]) => void) {
>fn2 : <T extends string[]>(param: T, cb: (element: T[number]) => void) => void
>param : T
>cb : (element: T[number]) => void
>element : T[number]
cb(param[0]);
>cb(param[0]) : void
>cb : (element: T[number]) => void
>param[0] : string
>param : T
>0 : 0
}
// Repro from #31149
function fn3<T extends ReadonlyArray<string>>(param: T, cb: (element: T[number]) => void) {
>fn3 : <T extends readonly string[]>(param: T, cb: (element: T[number]) => void) => void
>param : T
>cb : (element: T[number]) => void
>element : T[number]
cb(param[0]);
>cb(param[0]) : void
>cb : (element: T[number]) => void
>param[0] : string
>param : T
>0 : 0
}
function fn4<K extends number>() {
>fn4 : <K extends number>() => void
let x: Array<string>[K] = 'abc';
>x : string[][K]
>'abc' : "abc"
let y: ReadonlyArray<string>[K] = 'abc';
>y : readonly string[][K]
>'abc' : "abc"
}
// Repro from #31439 and #31691
export class c {
>c : c
[x: string]: string;
>x : string
constructor() {
this.a = "b";
>this.a = "b" : "b"
>this.a : string
>this : this
>a : string
>"b" : "b"
this["a"] = "b";
>this["a"] = "b" : "b"
>this["a"] : string
>this : this
>"a" : "a"
>"b" : "b"
}
}
// Repro from #31385
type Foo<T> = { [key: string]: { [K in keyof T]: K }[keyof T] };
>Foo : Foo<T>
>key : string
type Bar<T> = { [key: string]: { [K in keyof T]: [K] }[keyof T] };
>Bar : Bar<T>
>key : string
type Baz<T, Q extends Foo<T>> = { [K in keyof Q]: T[Q[K]] };
>Baz : Baz<T, Q>
type Qux<T, Q extends Bar<T>> = { [K in keyof Q]: T[Q[K]["0"]] };
>Qux : Qux<T, Q>
// Repro from #32038
const actions = ['resizeTo', 'resizeBy'] as const;
>actions : readonly ["resizeTo", "resizeBy"]
>['resizeTo', 'resizeBy'] as const : readonly ["resizeTo", "resizeBy"]
>['resizeTo', 'resizeBy'] : readonly ["resizeTo", "resizeBy"]
>'resizeTo' : "resizeTo"
>'resizeBy' : "resizeBy"
for (const action of actions) {
>action : "resizeTo" | "resizeBy"
>actions : readonly ["resizeTo", "resizeBy"]
window[action] = (x, y) => {
>window[action] = (x, y) => { window[action](x, y); } : (x: number, y: number) => void
>window[action] : ((width: number, height: number) => void) & ((width: number, height: number) => void) & ((x: number, y: number) => void) & ((x: number, y: number) => void)
>window : Window & typeof globalThis
>action : "resizeTo" | "resizeBy"
>(x, y) => { window[action](x, y); } : (x: number, y: number) => void
>x : number
>y : number
window[action](x, y);
>window[action](x, y) : void
>window[action] : (((x: number, y: number) => void) & ((x: number, y: number) => void)) | (((width: number, height: number) => void) & ((width: number, height: number) => void))
>window : Window & typeof globalThis
>action : "resizeTo" | "resizeBy"
>x : number
>y : number
}
}
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