how to use a javascript module in typescript

Question

I have a file called model-parser.js

it contains:

var _ = require('lodash');

function getTypes(vitalsModel) {
    var vitals = _.get(vitalsModel, 'vitals');

    var rows = [];
    _.forEach(vitals, function (vital) {
        rows.unshift(Object.keys(vital));
    });

    return rows; 
} 

module.exports.getTypes = getTypes;

I want to use the above file in a typescript file. What is the correct syntax?

abhirathore2006 · Accepted Answer · 2016-12-28 05:50:00Z

2

if you have access to file, just change the extension to .ts and then simply write below style import

import { getTypes , someotherExport } from './yourfile' //above statement import individual exports or you can import everything in a variable like

import * as T from './yourfile'
//use it
T.getTypes()

if you don't have access to it, then you can try require

declare T:any;
let T = require('yourJS');
T.getTypes()

answered Dec 28, 2016 at 5:50

abhirathore2006

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4 Comments

Paarth Over a year ago

Note that this is only true in TS 2.1

reza Over a year ago

thank you it mostly works, except it can not find lodash.

reza Over a year ago

it still is looking for localhost:3000/lodash.js and not finding it. Not clear how to load lodash in a ts file. I have tried npm install --save @types/lodash and import * from "lodash"... still the same error

abhirathore2006 Over a year ago

lodash has typings so you can do, typings install dt~lodash. and use as import * as _ from lodash or import { functionName } from lodash

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