ts-type/lib/helper/intersection.d.ts

TypeScript 類型工具庫：提供豐富的類型操作工具和重新導出的內建類型 / TypeScript type utility library: provides rich type manipulation utilities and re-exported built-in types

/**
 * 將聯集類型轉換為交集類型
 * Convert union type to intersection type
 *
 * @see https://stackoverflow.com/questions/50374908/transform-union-type-to-intersection-type
 * @example
 * type FunctionUnion = (() => void) | ((p: string) => void);
 * type FunctionIntersection = (() => void) & ((p: string) => void);
 * type SynthesizedFunctionIntersection = ITSUnionToIntersection<FunctionUnion>
 * // type SynthesizedFunctionIntersection = (() => void) & ((p: string) => void)
 */
export type ITSUnionToIntersection<U> = (U extends any ? (k: U) => void : never) extends ((k: infer I) => void) ? I : never;