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tests/cases/compiler/reverseMappedPartiallyInferableTypes.ts(91,20): error TS18046: 'k' is of type 'unknown'.
==== tests/cases/compiler/reverseMappedPartiallyInferableTypes.ts (1 errors) ====
// Repro from #30505
export type Prop<T> = { (): T }
export type PropType<T> = Prop<T>;
export type PropDefaultValue<T> = T;
export type PropValidatorFunction<T> = (value: T) => boolean;
export type PropValidator<T> = PropOptions<T>;
export type PropOptions<T> = {
type: PropType<T>;
value?: PropDefaultValue<T>,
required?: boolean;
validator?: PropValidatorFunction<T>;
}
export type RecordPropsDefinition<T> = {
[K in keyof T]: PropValidator<T[K]>
}
export type PropsDefinition<T> = RecordPropsDefinition<T>;
declare function extend<T>({ props }: { props: PropsDefinition<T> }): PropsDefinition<T>;
interface MyType {
valid: boolean;
}
const r = extend({
props: {
notResolved: {
type: Object as PropType<MyType>,
validator: x => {
return x.valid;
}
},
explicit: {
type: Object as PropType<MyType>,
validator: (x: MyType) => {
return x.valid;
}
}
}
})
r.explicit
r.notResolved
r.explicit.required
r.notResolved.required
// Modified repro from #30505
type Box<T> = {
contents?: T;
contains?(content: T): boolean;
};
type Mapped<T> = {
[K in keyof T]: Box<T[K]>;
}
declare function id<T>(arg: Mapped<T>): Mapped<T>;
// All properties have inferable types
const obj1 = id({
foo: {
contents: ""
}
});
// Some properties have inferable types
const obj2 = id({
foo: {
contents: "",
contains(k) {
return k.length > 0;
}
}
});
// No properties have inferable types
const obj3 = id({
foo: {
contains(k) {
return k.length > 0;
~
!!! error TS18046: 'k' is of type 'unknown'.
}
}
});
// Repros from #40809
type Mapped1<T> = {
[K in keyof T]: [T[K], (arg: T) => boolean];
};
declare function inferMapped1<T>(arg: Mapped1<T>): void;
inferMapped1({
key: [3, arg => arg.key > 5]
});
type Mapped2<T> = {
[K in keyof T]: [T[K], unknown extends T ? unknown : (arg: T) => boolean];
};
declare function inferMapped2<T>(arg: Mapped2<T>): void;
inferMapped2({
key: [3, arg => arg.key > 5]
});
type MappedReadonly<T> = {
readonly [K in keyof T]: readonly [T[K], (arg: T) => boolean];
};
declare function inferMappedReadonly<T>(arg: MappedReadonly<T>): void;
inferMappedReadonly({
key: [3, arg => arg.key > 5]
});
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