Converting JavaScript `require` to TypeScript

Question

I am reading a tutorial on Express and Node.js and trying to convert the JavaScript to TypeScript.

The code includes

var handlebars = require("express-handlebars")
    .create({ defaultLayout: 'main' });

which I have translated to TypeScript as is.

Is there a more idiomatic TypeScript using import ... as (from ECMAScript 6) or import handlebars = ... that accomplishes the same thing (including the call to create)?

I have tried the following:

import handlebars = require("express-handlebars")
handlebars.create({ defaultLayout: 'main' })

but I get a runtime error from nodejs on the later line

app.engine('handlebars', handlebars.engine)

saying Error: callback function required.

I assume that the error comes because the object has not been properly created.

Try using the 'new' ES6 style syntax: import * as handlebars from 'express-handlebars' — Bruno Grieder
– Bruno Grieder, Commented Dec 19, 2015 at 13:57
I tried that, but when I add handlebars.create(...) as the next line, I get the nodejs error indicated above. — Ralph
– Ralph, Commented Dec 19, 2015 at 14:01
I do not know this package but looking at the exports there is no engine exported. I would guess it is import * as handlebars from 'express-handlebars'; var engine = handlebars.create(...).engine; app.engine('handlebars, engine) — Bruno Grieder
– Bruno Grieder, Commented Dec 19, 2015 at 15:05
You are welcome. Converted the comment as an answer so that you can accept it — Bruno Grieder
– Bruno Grieder, Commented Dec 20, 2015 at 5:51

Bruno Grieder · Accepted Answer · 2015-12-20 05:51:16Z

2

I do not know this package but looking at the exports there is no engine exported.

My guess is

import * as handlebars from 'express-handlebars'; 
const engine = handlebars.create(...).engine; 
app.engine('handlebars', engine);

answered Dec 20, 2015 at 5:51

Bruno Grieder

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