I am using the Yargs JavaScript library for parsing command-line arguments.
The following is a Hello-World-style Yargs program. By default, it includes "--help" and "--version", and I am adding a 3rd option, "--copy":
const argv = yargs(process.argv.slice(2))
.alias("h", "help") // By default, only "--help" is enabled
.alias("v", "version") // By default, only "--version" is enabled
.boolean("copy")
.alias("c", "copy")
.describe("c", "run the copy function")
.argv;
However, running the program with a bogus flag (e.g. "--foo") will still work. I want the program to throw an error and exit if an invalid flag is passed. How do I do this?
