Module easing

Complete set of RPE easing functions (28 types) with helpers for evaluation, derivatives, integrals, and bezier curves. Compatible with RPE easingType 1–28.

Easing type reference

Usage examples

import { easing, EASING_NAMES, resolveEasingType } from './easing';

// Evaluate CubicOut at 50% progress
const v = easing(8, 0.5); // ~0.875

// Look up by name
const t = resolveEasingType('backOut'); // 20

// Use a sub-range [0.2, 0.8] of SineInOut
const v2 = easing(6, 0.5, 0.2, 0.8);

// Custom cubic-bezier (like CSS)
const v3 = easing(1, 0.5, 0, 1, undefined, [0.4, 0.0, 0.2, 1.0]);

// Resolve an easing name to a number before storing in an event
const easingType = resolveEasingType('elasticOut'); // 24
Copy