dependency-cruiser/src/analyze/derive/module-utl.mjs

Validate and visualize dependencies. With your rules. JavaScript, TypeScript, CoffeeScript. ES6, CommonJS, AMD.

export function metricsAreCalculable(pModule) {
	return (
		!pModule.coreModule &&
		!pModule.couldNotResolve &&
		!pModule.matchesDoNotFollow
	);
}

/**
 * returns the Instability of a component given the number of incoming (afferent)
 * and outgoing (efferent) connections ('couplings')
 *
 * @param {number} pEfferentCouplingCount
 * @param {number} pAfferentCouplingCount
 * @returns number
 */
export function calculateInstability(
	pEfferentCouplingCount,
	pAfferentCouplingCount,
) {
	// when both afferentCouplings and efferentCouplings equal 0 instability will
	// yield NaN. Judging Bob Martin's intention, a component with no outgoing
	// dependencies is maximum stable (0)
	return (
		pEfferentCouplingCount /
			(pEfferentCouplingCount + pAfferentCouplingCount) || 0
	);
}