smartguard/ts/classes.guard.ts

import * as plugins from './smartguard.plugins.js';

export type TGuardFunction<T> = (dataArg: T) => Promise<boolean>;

export interface IGuardOptions {
  name?: string;
  failedHint?: string;
}

export class Guard<T> {
  private guardFunction: TGuardFunction<T>;
  public options: IGuardOptions;
  constructor(guardFunctionArg: TGuardFunction<T>, optionsArg?: IGuardOptions) {
    this.guardFunction = guardFunctionArg;
    this.options = optionsArg;
  }

  /**
   * executes the guard against a data argument;
   * @param dataArg
   */
  public async exec(dataArg: T) {
    const result = await this.guardFunction(dataArg);
    return result;
  }

  public async getFailedHint(dataArg: T) {
    const result = await this.exec(dataArg);
    if (!result) {
      return this.options.failedHint;
    } else {
      return null;
    }
  }
}