function shouldThrow(func, errorMessage) { var errorThrown = false; var error = null; try { func(); } catch (e) { errorThrown = true; error = e; } if (!errorThrown) throw new Error('not thrown'); if (String(error) !== errorMessage) throw new Error(`bad error: ${String(error)}`); } function sloppyLoop(n) { if (n > 0) return sloppyLoop(...[n - 1]); } function strictLoop(n) { "use strict"; if (n > 0) return strictLoop(...[n - 1]); } shouldThrow(function () { sloppyLoop(100000); }, 'RangeError: Maximum call stack size exceeded.'); strictLoop(100000);