Transpiler Options via Env Variables

[elmpp]

I'm creating a ts-node script to run my application and would like to boost it to use SWC. The script uses environment variables to pass options onto ts-node

The swc/transpiler options don't seem to allow this. Is it possible this way?

I guess using the tsconfig setting method would be best "workaround" otherwise?

[elmpp]

const fs = require(`fs`);
const path = require(`path`);
const os = require(`os`);
const root = path.dirname(__dirname);

// Makes it possible to access our dependencies
const pnpFile = `${__dirname}/../../../../../.pnp.cjs`;
if (fs.existsSync(pnpFile))
  require(pnpFile).setup();

const tsconfig = `${__dirname}/../tsconfig.json`;

process.env.TS_NODE_FILES = true
process.env.TS_NODE_TRANSPILE_ONLY = true
process.env.TS_NODE_COMPILER_OPTIONS = '{\"importHelpers\": false}'
process.env.TS_NODE_PROJECT = tsconfig
// process.env.TS_NODE_TRANSPILER = require('ts-node/transpilers/swc-experimental'). // <!---- WOULD LOVE THIS

process.env.MNT_VERBOSITY='1'
process.env.FORCE_COLOR=1


require(`ts-node`).register();

module.exports = require(`./bin/mnt`);

[cspotcode]

In general, I don't plan to add environment variables for all ts-node options. The recommended approach is to use a tsconfig file that fully configures ts-node, with as many options as you may want to use. ts-node's environment variables predate the ability to specify configuration in tsconfig.

You can choose this tsconfig using TS_NODE_PROJECT or .register({project: 'path to tsconfig'})

.register() also accepts all options directly, so you can do .register({swc: true})
https://typestrong.org/ts-node/api/index.html#register
https://typestrong.org/ts-node/api/interfaces/RegisterOptions.html

If you really, really need a way to specify additional ts-node options via environment variable, you can send us a pull request implementing #1204.

[elmpp]

ah, didn't realise about the register() params. Nice one