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// @strict: true
// @target: es6
// #6611
export interface A<a> {
value: a;
}
function fn<a>(values: A<a>, value: a) : void {
}
declare let handlers: A<(value: number) => void>;
fn(handlers, value => alert(value));
// #21382
interface BaseProps<T> {
initialValues: T;
nextValues: (cur: T) => T;
}
declare class Component<P> { constructor(props: P); props: P; }
declare class GenericComponent<Props = {}, Values = object>
extends Component<Props & BaseProps<Values>> {
iv: Values;
}
new GenericComponent({ initialValues: 12, nextValues: val => 12 });
// #22149
declare function useStringOrNumber<T extends string | number>(t: T, useIt: T extends string ? ((s: string) => void) : ((n: number) => void)): void;
useStringOrNumber("", foo => {});
// #25299
type ActionType<P> = string & { attachPayloadTypeHack?: P & never }
type Handler<S, P> = P extends void
? (state: S) => S
: (state: S, payload: P) => S
interface ActionHandler<S, P> {
actionType: ActionType<P>
handler: Handler<S, P>
}
declare function handler<S, P>(actionType: ActionType<P>, handler: Handler<S, P>): ActionHandler<S, P>
declare function createReducer<S>(
defaultState: S,
...actionHandlers: ActionHandler<S, any>[]
): any
interface AppState {
dummy: string
}
const defaultState: AppState = {
dummy: ''
}
const NON_VOID_ACTION: ActionType<number> = 'NON_VOID_ACTION'
, VOID_ACTION: ActionType<void> = 'VOID_ACTION'
createReducer(
defaultState,
handler(NON_VOID_ACTION, (state, _payload) => state),
handler(VOID_ACTION, state => state)
)
// #25814
type R = {
a: (x: number) => void;
b: (x: string) => void;
};
type O = {
on<P extends keyof R>(x: P, callback: R[P]): void;
};
declare var x: O;
x.on('a', a => {});
// #29775
namespace N1 {
declare class Component<P> {
constructor(props: P);
}
interface ComponentClass<P = {}> {
new (props: P): Component<P>;
}
type CreateElementChildren<P> =
P extends { children?: infer C }
? C extends any[]
? C
: C[]
: unknown;
declare function createElement<P extends {}>(
type: ComponentClass<P>,
...children: CreateElementChildren<P>
): any;
declare function createElement2<P extends {}>(
type: ComponentClass<P>,
child: CreateElementChildren<P>
): any;
class InferFunctionTypes extends Component<{children: (foo: number) => string}> {}
createElement(InferFunctionTypes, (foo) => "" + foo);
createElement2(InferFunctionTypes, [(foo) => "" + foo]);
}
// #30341
type InnerBox<T> = {
value: T;
}
type OuterBox<T> = {
inner: InnerBox<T>
};
type BoxConsumerFromOuterBox<T> =
T extends OuterBox<infer U> ?
(box: InnerBox<U>) => void :
never;
declare function passContentsToFunc<T>(outerBox: T, consumer: BoxConsumerFromOuterBox<T>): void;
declare const outerBoxOfString: OuterBox<string>;
passContentsToFunc(outerBoxOfString, box => box.value);
// Repro from #32349
type DooDad = 'SOMETHING' | 'ELSE' ;
class Interesting {
public compiles = () : Promise<DooDad> => {
return Promise.resolve().then(() => {
if (1 < 2) {
return 'SOMETHING';
}
return 'ELSE';
});
};
public doesnt = () : Promise<DooDad> => {
return Promise.resolve().then(() => {
return 'ELSE';
});
};
public slightlyDifferentErrorMessage = () : Promise<DooDad> => {
return Promise.resolve().then(() => {
if (1 < 2) {
return 'SOMETHING';
}
return 'SOMETHING';
});
};
}
// Repro from #32349
declare function invoke<T>(f: () => T): T;
let xx: 0 | 1 | 2 = invoke(() => 1);
// Repro from #32416
declare function assignPartial<T>(target: T, partial: Partial<T>): T;
let obj = {
foo(bar: string) {}
}
assignPartial(obj, { foo(...args) {} }); // args has type [string]
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