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Dir : ~/usr/share/doc/node-commander/examples/

Edit File: hook.js

#!/usr/bin/env node

// const commander = require('commander'); // (normal include)
const commander = require('../'); // include commander in git clone of commander repo
const program = new commander.Command();

// This example shows using some hooks for life cycle events.

program
  .option('-t, --trace', 'display trace statements for commands')
  .hook('preAction', (thisCommand, actionCommand) => {
    if (thisCommand.opts().trace) {
      console.log('>>>>');
      console.log(`About to call action handler for subcommand: ${actionCommand.name()}`);
      console.log('arguments: %O', actionCommand.args);
      console.log('options: %o', actionCommand.opts());
      console.log('<<<<');
    }
  });

program.command('delay')
  .option('--message <value>', 'custom message to display', 'Thanks for waiting')
  .argument('[seconds]', 'how long to delay', '1')
  .action(async(waitSeconds, options) => {
    await new Promise(resolve => setTimeout(resolve, parseInt(waitSeconds) * 1000));
    console.log(options.message);
  });

program.command('hello')
  .option('-e, --example')
  .action(() => console.log('Hello, world'));

// Some of the hooks or actions are async, so call parseAsync rather than parse.
program.parseAsync().then(() => {});

// Try the following:
//    node hook.js hello
//    node hook.js --profile hello
//    node hook.js --trace hello --example
//    node hook.js delay
//    node hook.js --trace delay 5 --message bye
//    node hook.js --profile delay