Some helpers to test hygen

hygenTestHelpers.ts

import fs from 'fs';
import path from 'path';
import execa from 'execa';
import { runner } from 'hygen';
import Logger from 'hygen/dist/logger';

export type ArgsObject = { [key: string]: string | boolean };

export const readFileString = (path: string) => fs.readFileSync(path, 'utf8');

export function toArgsArray(args: ArgsObject): string[] {
  return Object.keys(args).reduce((memo: string[], key) => {
    const value = args[key];

    if (typeof value === 'boolean') {
      memo.push(value ? `--${key}` : `--no-${key}`);
    } else if (typeof value === 'string') {
      memo.push(`--${key}=${value}`);
    }

    return memo;
  }, []);
}

export async function runMockHygen({
  namespace,
  generator,
  args,
}: {
  namespace: string;
  generator: string;
  args: ArgsObject;
}) {
  const cliArgs = [namespace, generator, ...toArgsArray(args)];

  return runner(cliArgs, {
    templates: path.join(__dirname, '../_templates'),
    cwd: process.cwd(),
    logger: new Logger(jest.fn()),
    debug: false,
    exec: (action, body) => {
      const opts = body && body.length > 0 ? { input: body } : {};
      return execa.command(action, { ...opts, shell: true });
    },
    createPrompter: () => ({
      prompt: jest.fn(() => {
        throw new Error('Failed to pass all prompt args in testing');
      }),
    }),
  });
}