There was an issue encountered while attempting to instantiate an object of Class A using the designated variable

I have the following class definition:

export class TechnicalContactInfo {
    constructor(){
       this.Communication = [];
    }
/** @description ContactFunctionCode */PER01;
/** @description ContactName */PER02;
/** @description Communication */Communication: Communication[];
}

When I try to create an object of it like this:

var TechnicalContactInfo:TechnicalContactInfo = new TechnicalContactInfo();

I am encountering the following error:

[ts] Cannot use 'new' with an expression whose type lacks a call or construct signature.

Could someone assist me in identifying the reason behind this issue?

typescript

Answer №1

The issue arises from using the same name for a variable as well as a class. This conflict becomes clearer when we consider how a class is compiled down to ES5:

var TechnicalContactInfo = /** @class */ (function () {
    function TechnicalContactInfo() {
    }
    return TechnicalContactInfo;
}());
var TechnicalContactInfo = new TechnicalContactInfo();

Attempting to define the TechnicalContactInfo variable results in an error because a variable with that name already exists, representing the class constructor function. Even with ES6's class syntax, this naming conflict remains problematic due to variables and classes sharing the same naming scope. Avoiding defining both a variable and a class with identical names is crucial to prevent such issues.

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