webpack/examples/cjs-tree-shaking/increment.js

const add = require("./math").add;
exports.increment = function increment(val) {
	return add(val, 1);
};
exports.incrementBy2 = function incrementBy2(val) {
	return add(val, 2);
};
exports.decrement = function decrement(val) {
	return add(val, 1);
};