@metamask/keyring-utils
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MetaMask Keyring utils
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text/typescript
/**
* Omit keys from a union type.
*
* The normal `Omit` type does not distribute over unions. So we use this
* workaround that applies `Omit` to each member of the union.
*
* See: <https://github.com/microsoft/TypeScript/issues/31501#issuecomment-1280579305>
*/
export type OmitUnion<Type, Key extends keyof any> = Type extends any ? Omit<Type, Key> : never;
/**
* Type that resolves to `true` if `Child` extends `Base`, otherwise `false`.
*
* @example
* ```ts
* type A = Extends<{a: string, b: string}, {a: string}>; // true
* type B = Extends<{a: string}, {a: string, b: string}>; // false
* ```
*/
export type Extends<Child, Base> = Child extends Base ? true : false;
/**
* Assert that a type extends `true`. It can be used, for example, to assert
* that a given type extends another type.
*
* @example
* ```ts
* expectTrue<Extends<{a: string, b: string}, {a: string}>>(); // Ok
* expectTrue<Extends<{a: string}, {a: string, b: string}>>(); // Error
* ```
*
* This function follows the naming pattern used on `tsd`.
*/
export declare function expectTrue<Type extends true>(): void;
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