| # `useHarmonicIntervalFn` | |
| Same as [`useInterval`](./useInterval.md) hook, but triggers all effects with the same delay | |
| at the same time. | |
| For example, this allows you to create ticking clocks on the page which re-render second counter | |
| all at the same time. | |
| ## Reference | |
| ```js | |
| useHarmonicIntervalFn(fn, delay?: number) | |
| ``` | |