react-querybuilder/dist/types-esm/types/type-fest/union-to-intersection.d.mts

React Query Builder component for constructing queries and filters, with utilities for executing them in various database and evaluation contexts

/**
Convert a union type to an intersection type using [distributive conditional types](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-8.html#distributive-conditional-types).

Inspired by [this Stack Overflow answer](https://stackoverflow.com/a/50375286/2172153).

@example
```
import type {UnionToIntersection} from 'type-fest';

type Union = {the(): void} | {great(arg: string): void} | {escape: boolean};

type Intersection = UnionToIntersection<Union>;
//=> {the(): void; great(arg: string): void; escape: boolean};
```

A more applicable example which could make its way into your library code follows.

@example
```
import type {UnionToIntersection} from 'type-fest';

class CommandOne {
commands: {
a1: () => undefined,
b1: () => undefined,
}
}

class CommandTwo {
commands: {
a2: (argA: string) => undefined,
b2: (argB: string) => undefined,
}
}

const union = [new CommandOne(), new CommandTwo()].map(instance => instance.commands);
type Union = typeof union;
//=> {a1(): void; b1(): void} | {a2(argA: string): void; b2(argB: string): void}

type Intersection = UnionToIntersection<Union>;
//=> {a1(): void; b1(): void; a2(argA: string): void; b2(argB: string): void}
```

@group type-fest
*/
export type UnionToIntersection<Union> = (Union extends unknown ? (distributedUnion: Union) => void : never) extends ((mergedIntersection: infer Intersection) => void) ? Intersection & Union : never;