Can I import functions into a typescript class file?

Question

I have Typescript classes that look like this:

class WordService implements IWordService {

    wordCreatedById: number = 0;
    wordModifiedById: number = 0;

    static $inject = [
        "$http",
        "$q",
        ...
    ];

    constructor(
        public $http: ng.IHttpService,
        public $q: ng.IQService,
        ...
    ) {

    }

    wordClear = (): void => {
        this.word = null;
        this.wordBase = null;
    }

    ...

}

My class files have become very long now as I defined more and more functions like wordClear.

Is there any way that I could move functions into another file and import them into my class?

Answer 1

If you're asking about using other functions in class definitions this is one way to accomplish it. Let's put this in utilFunctions.ts (or whatever you want to call it.

export function wordClear(obj:{word:any, wordBase:any}/*replace with relevant interface*/) :void {
    obj.word = null;
    obj.wordBase = null;
}

and then in the class ts file

import * as utilFunctions from './utilFunctions'

class WordService implements IWordService {
    ...
    wordClear = ()=>utilFunctions.wordClear(this);
}

Or

import * as utilFunctions from './utilFunctions'

class WordService implements IWordService {
    ...
    public wordClear() {
        utilFunctions.wordClear(this);
    }
}