Typescript does not produce unused members

Having an issue with the JS code that TypeScript compiler is generating. Here's an example class:

// Class
export class UserDTO {
    Id: number;
    FirstName: string;
    LastName: string;
    DateOfBirth: Date;

    getFullName(): string {
        return this.FirstName + ' ' + this.LastName;
    }        
}

The TypeScript output looks like this:

define(["require", "exports"], function(require, exports) {
    // Class
    var UserDTO = (function () {
        function UserDTO() {
        }
        UserDTO.prototype.getFullName = function () {
            return this.FirstName + ' ' + this.LastName;
        };
        return UserDTO;
    })();
    exports.UserDTO = UserDTO;
});
//@ sourceMappingURL=TestClass.js.map

This code doesn't include unused fields which I need for certain object-to-object mapping scenarios. Is there a way to always force the compiler to generate them?

Currently using TypeScript 0.9.1 with Visual Studio 2012, and here are my compiler options:

<TypeScriptTarget>ES5</TypeScriptTarget>
<TypeScriptIncludeComments>true</TypeScriptIncludeComments>
<TypeScriptSourceMap>true</TypeScriptSourceMap>
<TypeScriptModuleKind>AMD</TypeScriptModuleKind>

Appreciate any suggestions or tips in advance.

Answer №1

In JavaScript, there is no requirement to explicitly declare fields. TypeScript's field declarations serve as a means for type checking exclusively. Despite this, you can still access your fields using compiled code.

let user = new UserData();
user.firstName = 'Alice';
user.lastName = 'Smith';
console.log(user.getFullName()); // "Alice Smith"

JSFiddle demo: http://jsfiddle.net/nPr6f/

Answer №2

To set initial values for variables, you can do so during their declaration:

export class UserDTO {
    Id: number = 0;
    FirstName: string = '';
    LastName: string = '';
    DateOfBirth: Date = undefined;

    getFullName(): string {
        return this.FirstName + ' ' + this.LastName;
    }        
}

Resulting javascript code:

var UserDTO = (function () {
    function UserDTO() {
        this.Id = 0;
        this.FirstName = '';
        this.LastName = '';
        this.DateOfBirth = undefined;
    }
    UserDTO.prototype.getFullName = function () {
        return this.FirstName + ' ' + this.LastName;
    };
    return UserDTO;
})();

Check out a demo demonstrating how to iterate through object properties.

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