You need to export a default value which will look like: export default class MapAction implements IMapAction {... And import it as: import MapAction from './map_action_file'; Alternatively, if you …

Jan 23, 2024 · When you create an object using the new keyword along with a constructor function, that function serves as the constructor for the object. If you don't provide a …

Nov 10, 2017 · export default class Proofr { constructor() { console.log('test'); } } This "script" is then generated by webpack , with eslint-loader and babel-loader (presets env & stage-0). So it …

Apr 11, 2012 · You have a variable Project somewhere that is not a function. Then the new operator will complain about it. Try console.log(Project) at the place where you would have …

Mar 13, 2025 · If your class is a derived class, the default constructor calls the parent constructor, passing along any arguments that were provided: js constructor(...args) { super(...args); }

Mar 13, 2025 · In JavaScript, function parameters default to undefined. However, it's often useful to set a different default value. This is where default parameters can help. In the following …

Property Default Values. A value given to a property will be a default value for all objects created by the constructor:

There are two main scenarios that can lead to this error: JavaScript constructors are typically functions defined using the function keyword or the class syntax. If you try to create a new …

Jan 14, 2025 · JavaScript developers often encounter the error ReferenceError: X is not a constructor. This error can be puzzling, especially for those new to the language. In this article, …

Jul 9, 2014 · But nevertheless, constructors that do not take into account the possibility of being called without the new keyword are a potential problem. So what can we do? solution: auto …