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October 31, 2025 14:07
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Implementation Of Laravel "tap" Helper In TypeScript
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| type TapProxy<T extends object> = { | |
| [K in keyof T]: T[K] extends (...args: infer A) => unknown | |
| ? (...args: A) => T | |
| : T[K]; | |
| }; | |
| function tap<T extends object>(obj: T): TapProxy<T>; | |
| function tap<T extends object>(obj: T, fn: (target: T) => void): T; | |
| function tap<T extends object>( | |
| obj: T, | |
| fn?: (target: T) => void, | |
| ): T | TapProxy<T> { | |
| if (!fn) { | |
| return new Proxy(obj, { | |
| get(target, prop, receiver) { | |
| const value = Reflect.get(target, prop, receiver); | |
| if (typeof value === "function") { | |
| return function (...args: unknown[]) { | |
| value.apply(obj, args); | |
| return obj; | |
| }; | |
| } | |
| return value; | |
| }, | |
| }); | |
| } | |
| fn(obj); | |
| return obj; | |
| } | |
| const user = { | |
| name: "Hammed Oyedele", | |
| save() { | |
| console.log("saving"); | |
| }, | |
| }; | |
| console.log("Proxy", tap(user).save().name); // "Hammed Oyedele" | |
| console.log("Callback", tap(user, (u) => u.save()).name); // "Hammed Oyedele" |
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