effect-sql-kysely/src/internal/DeferredPromise.ts

A full-featured integration between `@effect/sql` and `Kysely` that provides type-safe database operations with Effect's powerful error handling and resource management.

// Helper for creating a deferred promise
export class DeferredPromise<T> {
  readonly _promise: Promise<T>;

  _resolve?: (value: T | PromiseLike<T>) => void;
  _reject?: (reason?: unknown) => void;

  constructor() {
    this._promise = new Promise<T>((resolve, reject) => {
      this._reject = reject;
      this._resolve = resolve;
    });
  }

  get promise(): Promise<T> {
    return this._promise;
  }

  resolve = (value: T | PromiseLike<T>): void => this._resolve?.(value);
  reject = (reason?: unknown): void => this._reject?.(reason);
}