text: function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
  
  function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
  
  import { isBigNumber, isComplex, isFraction, isMatrix, isUnit } from '../../utils/is';
  import { isFactory, stripOptionalNotation } from '../../utils/factory';
  import { hasOwnProperty, lazy } from '../../utils/object';
  import { contains } from '../../utils/array';
  import { ArgumentsError } from '../../error/ArgumentsError';
  export function importFactory(typed, load, math, importedFactories) {
    /**
     * Import functions from an object or a module.
     *
     * This function is only available on a mathjs instance created using `create`.
     *
     * Syntax:
     *
     *    math.import(functions)
     *    math.import(functions, options)
     *
     * Where:
     *
     * - `functions: Object`
     *   An object with functions or factories to be imported.
     * - `options: Object` An object with import options. Available options:
     *   - `override: boolean`
     *     If true, existing functions will be overwritten. False by default.
     *   - `silent: boolean`
     *     If true, the function will not throw errors on duplicates or invalid
     *     types. False by default.
     *   - `wrap: boolean`
     *     If true, the functions will be wrapped in a wrapper function
     *     which converts data types like Matrix to primitive data types like Array.
     *     The wrapper is needed when extending math.js with libraries which do not
     *     support these data type. False by default.
     *
     * Examples:
     *
     *    import { create, all } from 'mathjs'
     *    import * as numbers from 'numbers'
     *
     *    // create a mathjs instance
     *    const math = create(all)
     *
     *    // define new functions and variables
     *    math.import({
     *      myvalue: 42,
     *      hello: function (name) {
     *        return 'hello, ' + name + '!'
     *      }
     *    })
     *
     *    // use the imported function and variable
     *    math.myvalue * 2               // 84
     *    math.hello('user')             // 'hello, user!'
     *
     *    // import the npm module 'numbers'
     *    // (must be installed first with `npm install numbers`)
     *    math.import(numbers, {wrap: true})
     *
     *    math.fibonacci(7) // returns 13
     *
     * @param {Object | Array} functions  Object with functions to be imported.
     * @param {Object} [options]          Import options.
     */
    function mathImport(functions, options) {
      var num = arguments.length;
  
      if (num !== 1 && num !== 2) {
        throw new ArgumentsError('import', num, 1, 2);
      }
  
      if (!options) {
        options = {};
      }
  
      function flattenImports(flatValues, value, name) {
        if (Array.isArray(value)) {
          value.forEach(function (item) {
            return flattenImports(flatValues, item);
          });
        } else if (_typeof(value) === 'object') {
          for (var _name in value) {
            if (hasOwnProperty(value, _name)) {
              flattenImports(flatValues, value[_name], _name);
            }
          }
        } else if (isFactory(value) || name !== undefined) {
          var flatName = isFactory(value) ? isTransformFunctionFactory(value) ? value.fn + '.transform' : // TODO: this is ugly
          value.fn : name; // we allow importing the same function twice if it points to the same implementation
  
          if (hasOwnProperty(flatValues, flatName) && flatValues[flatName] !== value && !options.silent) {
            throw new Error('Cannot import "' + flatName + '" twice');
          }
  
          flatValues[flatName] = value;
        } else {
          if (!options.silent) {
            throw new TypeError('Factory, Object, or Array expected');
          }
        }
      }
  
      var flatValues = {};
      flattenImports(flatValues, functions);
  
      for (var name in flatValues) {
        if (hasOwnProperty(flatValues, name)) {
          // console.log('import', name)
          var value = flatValues[name];
  
          if (isFactory(value)) {
            // we ignore name here and enforce the name of the factory
            // maybe at some point we do want to allow overriding it
            // in that case we can implement an option overrideFactoryNames: true
            _importFactory(value, options);
          } else if (isSupportedType(value)) {
            _import(name, value, options);
          } else {
            if (!options.silent) {
              throw new TypeError('Factory, Object, or Array expected');
            }
          }
        }
      }
    }
    /**
     * Add a property to the math namespace
     * @param {string} name
     * @param {*} value
     * @param {Object} options  See import for a description of the options
     * @private
     */
  
  
    function _import(name, value, options) {
      // TODO: refactor this function, it's to complicated and contains duplicate code
      if (options.wrap && typeof value === 'function') {
        // create a wrapper around the function
        value = _wrap(value);
      } // turn a plain function with a typed-function signature into a typed-function
  
  
      if (hasTypedFunctionSignature(value)) {
        value = typed(name, _defineProperty({}, value.signature, value));
      }
  
      if (isTypedFunction(math[name]) && isTypedFunction(value)) {
        if (options.override) {
          // give the typed function the right name
          value = typed(name, value.signatures);
        } else {
          // merge the existing and typed function
          value = typed(math[name], value);
        }
  
        math[name] = value;
        delete importedFactories[name];
  
        _importTransform(name, value);
  
        math.emit('import', name, function resolver() {
          return value;
        });
        return;
      }
  
      if (math[name] === undefined || options.override) {
        math[name] = value;
        delete importedFactories[name];
  
        _importTransform(name, value);
  
        math.emit('import', name, function resolver() {
          return value;
        });
        return;
      }
  
      if (!options.silent) {
        throw new Error('Cannot import "' + name + '": already exists');
      }
    }
  
    function _importTransform(name, value) {
      if (value && typeof value.transform === 'function') {
        math.expression.transform[name] = value.transform;
  
        if (allowedInExpressions(name)) {
          math.expression.mathWithTransform[name] = value.transform;
        }
      } else {
        // remove existing transform
        delete math.expression.transform[name];
  
        if (allowedInExpressions(name)) {
          math.expression.mathWithTransform[name] = value;
        }
      }
    }
  
    function _deleteTransform(name) {
      delete math.expression.transform[name];
  
      if (allowedInExpressions(name)) {
        math.expression.mathWithTransform[name] = math[name];
      } else {
        delete math.expression.mathWithTransform[name];
      }
    }
    /**
     * Create a wrapper a round an function which converts the arguments
     * to their primitive values (like convert a Matrix to Array)
     * @param {Function} fn
     * @return {Function} Returns the wrapped function
     * @private
     */
  
  
    function _wrap(fn) {
      var wrapper = function wrapper() {
        var args = [];
  
        for (var i = 0, len = arguments.length; i < len; i++) {
          var arg = arguments[i];
          args[i] = arg && arg.valueOf();
        }
  
        return fn.apply(math, args);
      };
  
      if (fn.transform) {
        wrapper.transform = fn.transform;
      }
  
      return wrapper;
    }
    /**
     * Import an instance of a factory into math.js
     * @param {function(scope: object)} factory
     * @param {Object} options  See import for a description of the options
     * @param {string} [name=factory.name] Optional custom name
     * @private
     */
  
  
    function _importFactory(factory, options) {
      var name = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : factory.fn;
  
      if (contains(name, '.')) {
        throw new Error('Factory name should not contain a nested path. ' + 'Name: ' + JSON.stringify(name));
      }
  
      var namespace = isTransformFunctionFactory(factory) ? math.expression.transform : math;
      var existingTransform = (name in math.expression.transform);
      var existing = hasOwnProperty(namespace, name) ? namespace[name] : undefined;
  
      var resolver = function resolver() {
        // collect all dependencies, handle finding both functions and classes and other special cases
        var dependencies = {};
        factory.dependencies.map(stripOptionalNotation).forEach(function (dependency) {
          if (contains(dependency, '.')) {
            throw new Error('Factory dependency should not contain a nested path. ' + 'Name: ' + JSON.stringify(dependency));
          }
  
          if (dependency === 'math') {
            dependencies.math = math;
          } else if (dependency === 'mathWithTransform') {
            dependencies.mathWithTransform = math.expression.mathWithTransform;
          } else if (dependency === 'classes') {
            // special case for json reviver
            dependencies.classes = math;
          } else {
            dependencies[dependency] = math[dependency];
          }
        });
        var instance = /* #__PURE__ */factory(dependencies);
  
        if (instance && typeof instance.transform === 'function') {
          throw new Error('Transforms cannot be attached to factory functions. ' + 'Please create a separate function for it with exports.path="expression.transform"');
        }
  
        if (existing === undefined || options.override) {
          return instance;
        }
  
        if (isTypedFunction(existing) && isTypedFunction(instance)) {
          // merge the existing and new typed function
          return typed(existing, instance);
        }
  
        if (options.silent) {
          // keep existing, ignore imported function
          return existing;
        } else {
          throw new Error('Cannot import "' + name + '": already exists');
        }
      }; // TODO: add unit test with non-lazy factory
  
  
      if (!factory.meta || factory.meta.lazy !== false) {
        lazy(namespace, name, resolver); // FIXME: remove the `if (existing &&` condition again. Can we make sure subset is loaded before subset.transform? (Name collision, and no dependencies between the two)
  
        if (existing && existingTransform) {
          _deleteTransform(name);
        } else {
          if (isTransformFunctionFactory(factory) || factoryAllowedInExpressions(factory)) {
            lazy(math.expression.mathWithTransform, name, function () {
              return namespace[name];
            });
          }
        }
      } else {
        namespace[name] = resolver(); // FIXME: remove the `if (existing &&` condition again. Can we make sure subset is loaded before subset.transform? (Name collision, and no dependencies between the two)
  
        if (existing && existingTransform) {
          _deleteTransform(name);
        } else {
          if (isTransformFunctionFactory(factory) || factoryAllowedInExpressions(factory)) {
            lazy(math.expression.mathWithTransform, name, function () {
              return namespace[name];
            });
          }
        }
      } // TODO: improve factories, store a list with imports instead which can be re-played
  
  
      importedFactories[name] = factory;
      math.emit('import', name, resolver);
    }
    /**
     * Check whether given object is a type which can be imported
     * @param {Function | number | string | boolean | null | Unit | Complex} object
     * @return {boolean}
     * @private
     */
  
  
    function isSupportedType(object) {
      return typeof object === 'function' || typeof object === 'number' || typeof object === 'string' || typeof object === 'boolean' || object === null || isUnit(object) || isComplex(object) || isBigNumber(object) || isFraction(object) || isMatrix(object) || Array.isArray(object);
    }
    /**
     * Test whether a given thing is a typed-function
     * @param {*} fn
     * @return {boolean} Returns true when `fn` is a typed-function
     */
  
  
    function isTypedFunction(fn) {
      return typeof fn === 'function' && _typeof(fn.signatures) === 'object';
    }
  
    function hasTypedFunctionSignature(fn) {
      return typeof fn === 'function' && typeof fn.signature === 'string';
    }
  
    function allowedInExpressions(name) {
      return !hasOwnProperty(unsafe, name);
    }
  
    function factoryAllowedInExpressions(factory) {
      return factory.fn.indexOf('.') === -1 && // FIXME: make checking on path redundant, check on meta data instead
      !hasOwnProperty(unsafe, factory.fn) && (!factory.meta || !factory.meta.isClass);
    }
  
    function isTransformFunctionFactory(factory) {
      return factory !== undefined && factory.meta !== undefined && factory.meta.isTransformFunction === true || false;
    } // namespaces and functions not available in the parser for safety reasons
  
  
    var unsafe = {
      expression: true,
      type: true,
      docs: true,
      error: true,
      json: true,
      chain: true // chain method not supported. Note that there is a unit chain too.
  
    };
    return mathImport;
  }