bun-types

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END OF TERMS AND CONDITIONS */ /** * Negates a boolean type. */ export type Not<T extends boolean> = T extends true ? false : true; /** * Returns `true` if at least one of the types in the * {@linkcode Types} array is `true`, otherwise returns `false`. */ export type Or<Types extends boolean[]> = Types[number] extends false ? false : true; /** * Checks if all the boolean types in the {@linkcode Types} array are `true`. */ export type And<Types extends boolean[]> = Types[number] extends true ? true : false; /** * Represents an equality type that returns {@linkcode Right} if * {@linkcode Left} is `true`, * otherwise returns the negation of {@linkcode Right}. */ export type Eq<Left extends boolean, Right extends boolean> = Left extends true ? Right : Not<Right>; /** * Represents the exclusive OR operation on a tuple of boolean types. * Returns `true` if exactly one of the boolean types is `true`, * otherwise returns `false`. */ export type Xor<Types extends [boolean, boolean]> = Not<Eq<Types[0], Types[1]>>; /** * @internal */ declare const secret: unique symbol; /** * @internal */ type Secret = typeof secret; /** * Checks if the given type is `never`. */ export type IsNever<T> = [T] extends [never] ? true : false; /** * Checks if the given type is `any`. */ export type IsAny<T> = [T] extends [Secret] ? Not<IsNever<T>> : false; /** * Determines if the given type is `unknown`. */ export type IsUnknown<T> = [unknown] extends [T] ? Not<IsAny<T>> : false; /** * Determines if a type is either `never` or `any`. */ export type IsNeverOrAny<T> = Or<[IsNever<T>, IsAny<T>]>; /** * Subjective "useful" keys from a type. For objects it's just `keyof` but for * tuples/arrays it's the number keys. * * @example * ```ts * UsefulKeys<{ a: 1; b: 2 }> // 'a' | 'b' * * UsefulKeys<['a', 'b']> // '0' | '1' * * UsefulKeys<string[]> // number * ``` */ export type UsefulKeys<T> = T extends any[] ? { [K in keyof T]: K; }[number] : keyof T; /** * Extracts the keys from a type that are required (not optional). */ export type RequiredKeys<T> = Extract< { [K in keyof T]-?: {} extends Pick<T, K> ? never : K; }[keyof T], keyof T >; /** * Gets the keys of an object type that are optional. */ export type OptionalKeys<T> = Exclude<keyof T, RequiredKeys<T>>; /** * Extracts the keys from a type that are not `readonly`. */ export type ReadonlyKeys<T> = Extract< { [K in keyof T]-?: ReadonlyEquivalent< { [_K in K]: T[K]; }, { -readonly [_K in K]: T[K]; } > extends true ? never : K; }[keyof T], keyof T >; /** * Determines if two types, are equivalent in a `readonly` manner. * * @internal */ type ReadonlyEquivalent<X, Y> = Extends<<T>() => T extends X ? true : false, <T>() => T extends Y ? true : false>; /** * Checks if one type extends another. Note: this is not quite the same as `Left extends Right` because: * 1. If either type is `never`, the result is `true` iff the other type is also `never`. * 2. Types are wrapped in a 1-tuple so that union types are not distributed - instead we consider `string | number` to _not_ extend `number`. If we used `Left extends Right` directly you would get `Extends<string | number, number>` => `false | true` => `boolean`. */ export type Extends<Left, Right> = IsNever<Left> extends true ? IsNever<Right> : [Left] extends [Right] ? true : false; /** * Checks if the {@linkcode Left} type extends the {@linkcode Right} type, * excluding `any` or `never`. */ export type ExtendsExcludingAnyOrNever<Left, Right> = IsAny<Left> extends true ? IsAny<Right> : Extends<Left, Right>; /** * Checks if two types are strictly equal using * the TypeScript internal identical-to operator. * * @see {@link https://github.com/microsoft/TypeScript/issues/55188#issuecomment-1656328122 | much history} */ export type StrictEqualUsingTSInternalIdenticalToOperator<L, R> = (<T>() => T extends (L & T) | T ? true : false) extends <T>() => T extends (R & T) | T ? true : false ? IsNever<L> extends IsNever<R> ? true : false : false; /** * Checks that {@linkcode Left} and {@linkcode Right} extend each other. * Not quite the same as an equality check since `any` can make it resolve * to `true`. So should only be used when {@linkcode Left} and * {@linkcode Right} are known to avoid `any`. */ export type MutuallyExtends<Left, Right> = And<[Extends<Left, Right>, Extends<Right, Left>]>; /** * @internal */ declare const mismatch: unique symbol; /** * @internal */ type Mismatch = { [mismatch]: "mismatch"; }; /** * A type which should match anything passed as a value but *doesn't* * match {@linkcode Mismatch}. It helps TypeScript select the right overload * for {@linkcode PositiveExpectTypeOf.toEqualTypeOf | .toEqualTypeOf()} and * {@linkcode PositiveExpectTypeOf.toMatchTypeOf | .toMatchTypeOf()}. * * @internal */ declare const avalue: unique symbol; /** * Represents a value that can be of various types. */ export type AValue = | { [avalue]?: undefined; } | string | number | boolean | symbol | bigint | null | undefined | void; /** * Represents the type of mismatched arguments between * the actual result and the expected result. * * If {@linkcode ActualResult} and {@linkcode ExpectedResult} are equivalent, * the type resolves to an empty tuple `[]`, indicating no mismatch. * If they are not equivalent, it resolves to a tuple containing the element * {@linkcode Mismatch}, signifying a discrepancy between * the expected and actual results. */ export type MismatchArgs<ActualResult extends boolean, ExpectedResult extends boolean> = Eq<ActualResult, ExpectedResult> extends true ? [] : [Mismatch]; /** * Represents the options for the {@linkcode ExpectTypeOf} function. */ export interface ExpectTypeOfOptions { positive: boolean; branded: boolean; } /** * Convert a union to an intersection. * `A | B | C` -\> `A & B & C` */ export type UnionToIntersection<Union> = (Union extends any ? (distributedUnion: Union) => void : never) extends ( mergedIntersection: infer Intersection, ) => void ? Intersection : never; /** * Get the last element of a union. * First, converts to a union of `() => T` functions, * then uses {@linkcode UnionToIntersection} to get the last one. */ export type LastOf<Union> = UnionToIntersection<Union extends any ? () => Union : never> extends () => infer R ? R : never; /** * Intermediate type for {@linkcode UnionToTuple} which pushes the * "last" union member to the end of a tuple, and recursively prepends * the remainder of the union. */ export type TuplifyUnion<Union, LastElement = LastOf<Union>> = IsNever<Union> extends true ? [] : [...TuplifyUnion<Exclude<Union, LastElement>>, LastElement]; /** * Convert a union like `1 | 2 | 3` to a tuple like `[1, 2, 3]`. */ export type UnionToTuple<Union> = TuplifyUnion<Union>; export type IsTuple<T> = Or<[Extends<T, []>, Extends<T, [any, ...any[]]>]>; export type IsUnion<T> = Not<Extends<UnionToTuple<T>["length"], 1>>; /** * A recursive version of `Pick` that selects properties from the left type that are present in the right type. * The "leaf" types from `Left` are used - only the keys of `Right` are considered. * * @example * ```ts * const user = {email: 'a@b.com', name: 'John Doe', address: {street: '123 2nd St', city: 'New York', zip: '10001', state: 'NY', country: 'USA'}} * * type Result = DeepPickMatchingProps<typeof user, {name: unknown; address: {city: unknown}}> // {name: string, address: {city: string}} * ``` */ export type DeepPickMatchingProps<Left, Right> = Left extends Record<string, unknown> ? Pick< { [K in keyof Left]: K extends keyof Right ? DeepPickMatchingProps<Left[K], Right[K]> : never; }, Extract<keyof Left, keyof Right> > : Left; export {};