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Nikolajevs","email":"armins.nikolajevs@gmail.com"},"license":"MIT","keywords":["ticker","game-loop","animation-loop","requestanimationframe","rAF","fps","fps-limit","fps-limiter","delta-time","time-scale","tick","render-loop","update-loop","frame-rate","typescript","game-engine"],"description":"A lightweight, zero-dependency JavaScript/TypeScript library for running an application loop with separate logic and draw ticks, time scaling, FPS limiting, and low-FPS detection.","maintainers":[{"name":"armins.nikolajevs","email":"armins.nikolajevs@gmail.com"}],"readme":"# Ticker\n\n[![npm](https://img.shields.io/npm/v/@armniko/ticker)](https://www.npmjs.com/package/@armniko/canvas)\n![last published](https://img.shields.io/npm/last-update/@armniko/ticker)\n![zero dependencies](https://img.shields.io/badge/zero-dependencies-brightgreen)\n[![types](https://img.shields.io/npm/types/@armniko/ticker)](https://www.npmjs.com/package/@armniko/ticker)\n\nA lightweight, zero-dependency JavaScript/TypeScript library for running an application loop with **separate logic and\ndraw ticks**, **time scaling**, **FPS limiting** and **low-FPS detection**.\n
\n\n### Why Ticker?\n\n- 🎯 **Decoupled logic & rendering** — update game state and draw frames independently\n- 🎚️ **FPS control** — cap your draw rate to save CPU/battery\n- ⏱️ **Time scaling** — slow down or speed up time without touching your game logic\n- 📉 **Low-FPS callbacks** — react when performance degrades (e.g. lower visual quality)\n- 🧪 **Test-friendly** — ships with `TickerMock` for deterministic unit tests\n- 📦 **Zero dependencies** and fully typed\n\n### Installation\n\n```bash\nnpm install @armniko/ticker\n```\n\n### Usage\n\n```typescript\nimport { Ticker, Time } from '@armniko/ticker';\n\nconst ticker: Ticker = new Ticker();\nticker.addLogicTask((time: Time): void => {\n // calculate\n});\nticker.addDrawTask((): void => {\n // draw\n});\nticker.start();\n```\n\nTicker instance methods:\n\n- start() – starts ticker.\n- stop() – stops ticker.\n- isStarted() – checks if ticker is started.\n- setFps(options: { min?: number; max?: number; expected?: number }) - set min, max or expected FPS\n - min (default: 0) – defines value at which lowFps task callbacks will be called.\n - max (default: 60) – defines drawing FPS limit.\n - expected (default: 60) - defines expected logical and drawing FPS at which app should work in normal conditions.\n- setTimeScale(scale: number) – set time scale.\n- addLogicTask(callback) – register callback for update app logic. Returns TickerTaskId.\n- addDrawTask(callback) – register callback for update app screen. Returns TickerTaskId.\n- addLowFpsTask(callback) – register callback that will be called when reached min FPS. Returns TickerTaskId.\n- remove(taskId: TickerTaskId) – removes the provided task.\n- fps() – current FPS at which app operates.\n- timeScale() – current time scale at which app operates.\n- interpolationAlpha() – fraction (0..1) of the next logic step already elapsed; use it in draw tasks to interpolate between the previous and current logic state when max FPS is higher than expected FPS.\n\n### Migration\n\n#### v1 -> v2\n\nBefore (v1):\n\n```typescript\nimport { Ticker } from '@armniko/ticker';\n\nconst element: { position: { x: number, y: number } } = { position: { x: 0, y: 0 } };\nconst animation: { durationMs: number, distancePx: number } = {\n durationMs: 2000,\n distancePx: 500,\n}\nconst ticker: Ticker = new Ticker({\n onLogicTick: (): void => {\n const pxPerMs: number = animation.distancePx / animation.durationMs;\n element.position.x += pxPerMs * ticker.msBetweenTicks();\n },\n onDrawTick: (): void => {\n // draw element\n },\n});\nticker.start();\n```\n\nAfter (v2):\n\n```typescript\nimport { Ticker, Time } from '@armniko/ticker';\n\nconst element: { position: { x: number, y: number } } = { position: { x: 0, y: 0 } };\nconst animation: { durationMs: number, distancePx: number } = {\n durationMs: 2000,\n distancePx: 500,\n}\nconst ticker: Ticker = new Ticker();\nticker.addLogicTask((time: Time): void => {\n const pxPerMs: number = animation.distancePx / animation.durationMs;\n element.position.x += pxPerMs * time.deltaMs;\n});\nticker.addDrawTask((): void => {\n // draw element\n});\nticker.start();\n```\n\n### Changelog\n\n\n\n \n \n\n\n \n \n\n\n \n \n\n\n \n \n\n\n \n \n\n\n \n \n\n\n \n \n\n\n \n \n\n
v2.4.0\n Added interpolationAlpha method.
\n Updated packages.\n
v2.3.0\n Added time scale feature.
\n Minor performance improvements.
\n Fixed low-fps callback to be called gain after fps recovery.
\n Fixed edge case bug with a removing task where an incorrect task could be removed.\n
v2.2.0\n Removed minification of build.
\n Added exports field for proper module resolution and types.
\n Marked package as side-effect free.\n
v2.1.1\n Updated packages.\n
v2.1.0\n Added option to provide Time for TickerMock.
\n Migrated from webpack to vite.\n
v2.0.0\n Multiple tick callbacks support.
\n Added TickerMock for testing.
\n Deprecated: constructor options, msBetweenTicks(), ticksMissed(). (See migration v1 -> v2)\n
v1.1.0\n Precompiled UMD and ESM.\n
v1.0.0\n Initial version.\n
\n","readmeFilename":"README.md"}