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

Helper functions and features for IsaacScript mods.

/** Helper type to check if an object or class has one or more functions/methods. */
export type HasFunction<T> = Record<string, unknown> extends {
    [K in keyof T as T[K] extends Function ? K : never]-?: 1;
} ? never : T;
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