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TS class and function name helper
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| // see https://www.typescriptlang.org/play/?#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-CU-A9m6mSUAXIwHgRZ02R4popjTPYG2wPAiDIFgQFoBhUGYXiPS9WZ8E8aa5lyKBTCqyk5M5QgoBSEMw0xCMi1uy4nheOAAQMQxTvwZgoQ+144CFfQ4r0xLDH6KaEUYOGLq9OjIP1Q1npNXFi3e55gdB37YagQHsa+kH3nB9qIChyAYbmOGPSOrA4CtACHrKKyXGsyoKTAZ55HZlxOBqZyoBJHpgKJTTJijAzEyarT52JYhiAAIW7dMMCXB7LFloRfDgABHJimPVi6Wa1tkGjiY3TE1l8QGCfBuwgK3TagHgs0kFwxt1STRAgap2RWSQAHI9gLSACC9bWGKSYhvfQABGFimv4eQD3EKR9n49g7JFsRr1TcbiCliBXPlorldVxZWFd3h9lzsWC91IufW-MvFZV65Fn2bOQvr-OJdhYvIvNuJq4It269F-vC+LkiR4gbvWcAGXJ3dDyTtXGwyIHKpIe4wPvxZnlvXMSfBY8kUo3ZXtRxD3g-G8l4+sDbiv0w4IA | |
| type AnyFn = (...args: any[]) => any; | |
| // Function keys of a type | |
| type FnKeys<T> = { | |
| [K in keyof T]-?: T[K] extends AnyFn ? K : never | |
| }[keyof T] & string; | |
| // Exclude Object prototype stuff + constructor (otherwise we get "toString", etc) | |
| type CleanFnKeys<T> = Exclude<FnKeys<T>, keyof Object | "constructor">; | |
| type OpProxy<ServiceName extends string, Keys extends string> = { | |
| [K in Keys]: `${ServiceName}.${K}`; | |
| }; | |
| function makeOpProxy<ServiceName extends string, Keys extends string>( | |
| serviceName: ServiceName | |
| ): OpProxy<ServiceName, Keys> { | |
| const cache = new Map<string, string>(); | |
| return new Proxy(Object.create(null), { | |
| get(_target, prop) { | |
| if (typeof prop !== "string") return undefined; | |
| const hit = cache.get(prop); | |
| if (hit) return hit; | |
| const value = `${serviceName}.${prop}`; | |
| cache.set(prop, value); | |
| return value; | |
| }, | |
| }) as any; | |
| } | |
| /** | |
| * One function: supports both static + instance methods. | |
| * | |
| * - `op(MyClass).someStaticMethod` | |
| * - `op(MyClass).someInstanceMethod` | |
| * | |
| * TS guarantees the member name of either static/instance is a function. | |
| */ | |
| export function op<TCtor extends abstract new (...args: any[]) => any>( | |
| ctor: TCtor & { name: string } | |
| ): OpProxy<string, CleanFnKeys<TCtor> | CleanFnKeys<InstanceType<TCtor>>> { | |
| return makeOpProxy<string, CleanFnKeys<TCtor> | CleanFnKeys<InstanceType<TCtor>>>(ctor.name); | |
| } | |
| // --- Examples --- | |
| class NotificationsService { | |
| static processBatch() {} | |
| static enqueue() {} | |
| sendOne() {} | |
| hydrate() {} | |
| // non-function fields won't appear | |
| static version = 1; | |
| status = "ok"; | |
| } | |
| op(NotificationsService).processBatch; // "NotificationsService.processBatch" | |
| op(NotificationsService).sendOne; // "NotificationsService.sendOne" | |
| // ❌ not a function member | |
| op(NotificationsService).version; | |
| // ❌ typo | |
| op(NotificationsService).processBach; |
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