One habit introduced to my current team by a former co-worker involves having even more intermediate keys than that:

    const sensitiveEnv = [...];
    const envKeys = Object.keys(envars)
    const safeKeys = envKeys.filter(envar => !sensitiveEnv.includes(envar));
    const safeEnv = safeKeys.map(envar => `${envar}=${envars[envar]}`).join(' ');
    const styled = chalk.dim(`$ ${envStr}`, 'node', args.join(' '));
    console.log(styled);

Now, of course, with a pipe operator (or other similar constructions) you can get the consistency without the intermediate names.