How to render typescript file to javascript programmatically?

Question

I'm trying to figure out how to render a typescript file programmatically to javascript file.

Is this possible to do with ts-node for example like this:

function tsMiddleware (req, res, next) {
    var parsed = require('url').parse(req.url);

    if (parsed.pathname.match(/\.ts$/)) {
        return ts(parsed.pathname).then(function (o) {
            res.setHeader('Content-Type', 'text/js');
            res.end(o.js);
        }).catch((err) => {
            console.log(err);
        });
    }
    next();

    function ts(src) {
        return new Promise((resolve, reject) => {
            require('ts-node').render({
                file: 'src' + src
            }, function (err, res) {
                if (err) {
                    reject(err);
                } else {
                    resolve(res);
                }
            });
        });
    }
}

I don't want to execute the ts file in nodejs, but instead just compile ts file and send the output back to the browser.

I would start here github.com/TypeStrong/ts-node#programmatic — Daniel Khoroshko
– Daniel Khoroshko, Commented Jan 3, 2018 at 1:36

Paleo · Accepted Answer · 2018-01-03 10:14:21Z

6

Here is an example:

const ts = require("typescript")
async function tsTranspile(tsCode) {
    return await ts.transpileModule(tsCode, { /* Here the compiler options */ })
}

How to use it:

tsTranspile("const f = a => a + 1")
    .then(jsCode => console.log(jsCode))
    .catch(err => console.log("Error:", err))

1 Comment

user3141759 Over a year ago

Thank you for the crisp example and pointing to the right package.

Collectives™ on Stack Overflow

How to render typescript file to javascript programmatically?

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related