             {
                action: 'console',
                level: 'system-warn',
                args: [`Timer '${label}' does not exist`],
              },
              '*'
            )
          }
          timers.delete(label)
        }

        const original_assert = console.assert
        console.assert = (condition, ...args) => {
          if (condition) {
            const stack = new Error().stack
            parent.postMessage(
              { action: 'console', level: 'assert', args, sta