ReferenceError: Object is not defined when I define multiple classes at same file

Question

I use Node.js 7.44.

In file user.models.ts, I have multiple classes, like:

import { Exclude, Expose } from "class-transformer";

export class User {
    @Expose() _id: string;
    @Expose() fname: string;
    @Expose() lname: string;
    @Expose() birthday: Date;
    @Expose() address: Address;

    constructor(){...}
}

@Exclude()
export class Address {
    @Expose() street: string;
    @Expose() num: number;
    @Expose() city: string;
    @Expose() zipCode: number;
}

When I compile the server, I get the error:

ReferenceError: Address is not defined

How can I use multiple classes in the same file?

First define the class and then use it. Because concept of hoisting is not applicable on the classes. — Shubham
– Shubham, Commented May 19, 2017 at 9:48
note: i think you are supposed to export juste one object per file, see the answer here: stackoverflow.com/questions/41228221/… — Kaddath
– Kaddath, Commented May 19, 2017 at 9:52

Kim Kern · Accepted Answer · 2019-01-19 13:56:29Z

1

Since you're using Address in User, you have to define Address first. Consider using the eslint rule no-use-before-define.

import { Exclude, Expose } from "class-transformer";

@Exclude()
export class Address {
    @Expose() street: string;
    @Expose() num: number;
    @Expose() city: string;
    @Expose() zipCode: number;
}

export class User {
    @Expose() _id: string;
    @Expose() fname: string;
    @Expose() lname: string;
    @Expose() birthday: Date;   
    @Expose() address: Address;

    constructor(){...}
}

answered Jan 19, 2019 at 13:56

Kim Kern

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