Suppress all Node.js warnings (including deprecation warnings)

suppress-warnings.cjs

const { emit: originalEmit } = process;

/**
 * @param {string} event
 * @param {{ name: string; }} error
 */
function suppresser(event, error) {
  return event === "warning" && error.name === "ExperimentalWarning"
    ? false
    : originalEmit.apply(process, arguments);
}

process.emit = suppresser;

How to use:

node --require="suppress-warnings.cjs" index.js

or with ts-node/tsx:

node --loader"ts-node/esm" --require"suppress-warnings.cjs" index.ts

or set in NODE_OPTIONS environment variable:

NODE_OPTIONS="--require=suppress-warnings.cjs" node index.js

Also works with npm/pnpm/yarn:

NODE_OPTIONS="--require=suppress-warnings.cjs" pnpm run my-awesome-script

or, if you're on Node.js v19 or higher, rename to suppress-warnings.mjs and replace --require with --import in the command.