@pipepack/enhanced-resolver/lib/utils/promisify.js

yet, reimplement enhanced-resolve with the idea 'simple is best'.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.promisify = promisify;

var _rxjs = require("rxjs");

/**
 * @description - execute observable and extract the first
 * @author - huang.jian <hjj491229492@hotmail.com>
 */
// package
function promisify(source$) {
  return new Promise((resolve, reject) => {
    const subscription = source$.subscribe({
      next(payload) {
        // complete promise
        resolve(payload); // dispose further payload

        subscription.unsubscribe();
      },

      error(error) {
        reject(error);
      },

      // not necessary with implicit first operator
      complete() {
        reject(new _rxjs.EmptyError());
      }

    });
  });
}
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