src/2-node/node3.js

import assert from 'assert';

import {CachedMeasure} from '../0-core/index.js';
import {Node2} from './2-Node2.js';
import {Node3} from './3-Node3.js';

export function node3(M, a, b, c) {
	assert(
		!(a instanceof Node2 || a instanceof Node3) || M instanceof CachedMeasure,
	);
	assert(
		a instanceof Node2 || a instanceof Node3 || !(M instanceof CachedMeasure),
	);
	return new Node3(
		M.plus(M.measure(a), M.plus(M.measure(b), M.measure(c))),
		a,
		b,
		c,
	);
}