abind/shim/node/abind.js

Auto bind instance methods of classes.

/**
 * Bind instance methods
 * @function abind
 * @param {Object} instance - Instance to bind
 * @param {Object} [options={}] - Optional settings
 * @param {Object} [options.proto=getPrototypeOf(instance)] - Prototype to bind
 * @param {string[]} [options.excludes] - Names to exclude
 * @returns {Object} instance - Bounded instance
 */
'use strict';
/** @lends abind */

function abind(instance) {
  var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
  var _options$proto = options.proto,
      proto = _options$proto === void 0 ? Object.getPrototypeOf(instance) : _options$proto,
      _options$excludes = options.excludes,
      excludes = _options$excludes === void 0 ? [] : _options$excludes;
  var propertyNames = Object.getOwnPropertyNames(proto).filter(function (name) {
    return !~excludes.indexOf(name);
  });
  var _iteratorNormalCompletion = true;
  var _didIteratorError = false;
  var _iteratorError = undefined;

  try {
    for (var _iterator = propertyNames[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
      var name = _step.value;

      var _ref = Object.getOwnPropertyDescriptor && Object.getOwnPropertyDescriptor(proto, name),
          get = _ref.get,
          set = _ref.set;

      var shouldBind = !/^__/.test(name) && (get || set);

      if (shouldBind) {
        Object.defineProperty(instance, name, {
          get: get,
          set: set
        });
        continue;
      }

      var value = proto[name];

      if (typeof value === 'function') {
        instance[name] = value.bind(instance);
      }
    }
  } catch (err) {
    _didIteratorError = true;
    _iteratorError = err;
  } finally {
    try {
      if (!_iteratorNormalCompletion && _iterator.return != null) {
        _iterator.return();
      }
    } finally {
      if (_didIteratorError) {
        throw _iteratorError;
      }
    }
  }

  return instance;
}

module.exports = abind;
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