isaacscript-common/dist/types/AddSubtract.d.ts

Helper functions and features for IsaacScript mods.

/**
 * Helper type to add two other types.
 *
 * From: https://gist.github.com/ryandabler/8b4ff4f36aed47bc09acc03174638468
 */
export type Add<A extends number, B extends number> = Length<[
    ...BuildTuple<A>,
    ...BuildTuple<B>
]>;
/**
 * Helper type to subtract two other types.
 *
 * From: https://gist.github.com/ryandabler/8b4ff4f36aed47bc09acc03174638468
 */
export type Subtract<A extends number, B extends number> = A extends A ? BuildTuple<A> extends [...infer U, ...BuildTuple<B>] ? Length<U> : never : never;
type BuildTuple<L extends number, T extends unknown[] = []> = T extends {
    length: L;
} ? T : BuildTuple<L, [...T, unknown]>;
type Length<T extends unknown[]> = T extends {
    length: infer L;
} ? L : never;
export {};
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