Sandbox::https://github.com/NativeScript/nativescript-cli/blob/main/dev/tsc-to-vitest-watch.js

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// Run "tsc" in watch mode alongside vitest. Vitest runs the compiled output,

// so on its own it never notices a .ts edit - tsc has to re-emit first, and

// vitest picks the change up from there.

const { spawn } = require("child_process");

// shell: true so the node_modules/.bin shims resolve on Windows as well

const spawnOptions = { stdio: "inherit", shell: true };

const children = [

// --preserveWatchOutput keeps tsc from clearing the screen and wiping the

// test results out from under you on every recompile

spawn("tsc", ["--watch", "--preserveWatchOutput"], spawnOptions),

// --watch explicitly: vitest only infers watch mode when stdout is a TTY,

// and would otherwise run once and exit, taking tsc down with it

spawn("vitest", ["--watch"], spawnOptions),

];

let shuttingDown = false;

function shutdown() {

if (shuttingDown) {

return;

}

shuttingDown = true;

for (const child of children) {

child.kill("SIGINT");

}

process.on("SIGINT", shutdown);

process.on("SIGTERM", shutdown);

for (const child of children) {

// if either side dies, don't leave the other running in the background

child.on("exit", shutdown);

}