spy on NodeJS require stack

node-require-debug.js

// Require this in your program, or load it with node's -r flag

const Mod = require('module')
const req = Mod.prototype.require
let indent = ''
const rootRE = new RegExp(process.cwd(), 'g')
const stack = []
Mod.prototype.require = function() {
	try {
		const request = arguments[0]
		const file = (new Error().stack.split('\n')[3] || '').trim()
		const loc = file
			.replace(/^at /, '> ')
			.replace(new RegExp(process.cwd(), 'g'), '.')
		const line = (indent + loc + ': ' + request).replace(rootRE, '.')
		stack.push(line)
		console.error(line)
		indent += '| '
		const result = req.apply(this, arguments)
		indent = indent.slice(0, -2)
		stack.pop()
		return result
	} catch (err) {
		console.error(
			'!!! require:',
			require('util').inspect(arguments),
			err.message
		)
		stack.forEach(line => console.error('!!! require:', line))
		throw err
	}
}