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watchGuard.ts

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/// <reference types="node" />

if (process.argv.length < 3) {

process.exit(1);

}

const directoryName = process.argv[2];

const fs: { watch(directoryName: string, options: any, callback: () => {}): any } = require("fs");

// main reason why we need separate process to check if it is safe to watch some path

// is to guard against crashes that cannot be intercepted with protected blocks and

// code in tsserver already can handle normal cases, like non-existing folders.

// This means that here we treat any result (success or exception) from fs.watch as success since it does not tear down the process.

// The only case that should be considered as failure - when watchGuard process crashes.

try {

const watcher = fs.watch(directoryName, { recursive: true }, () => ({}));

watcher.close();

}

catch { /*ignore*/ }

process.exit(0);