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node_modules/motion-dom/dist/es/animation/generators/keyframes.mjs

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+import { easeInOut, isEasingArray, easingDefinitionToFunction } from 'motion-utils';
+import { interpolate } from '../../utils/interpolate.mjs';
+import { defaultOffset } from '../keyframes/offsets/default.mjs';
+import { convertOffsetToTimes } from '../keyframes/offsets/time.mjs';
+
+function defaultEasing(values, easing) {
+    return values.map(() => easing || easeInOut).splice(0, values.length - 1);
+}
+function keyframes({ duration = 300, keyframes: keyframeValues, times, ease = "easeInOut", }) {
+    /**
+     * Easing functions can be externally defined as strings. Here we convert them
+     * into actual functions.
+     */
+    const easingFunctions = isEasingArray(ease)
+        ? ease.map(easingDefinitionToFunction)
+        : easingDefinitionToFunction(ease);
+    /**
+     * This is the Iterator-spec return value. We ensure it's mutable rather than using a generator
+     * to reduce GC during animation.
+     */
+    const state = {
+        done: false,
+        value: keyframeValues[0],
+    };
+    /**
+     * Create a times array based on the provided 0-1 offsets
+     */
+    const absoluteTimes = convertOffsetToTimes(
+    // Only use the provided offsets if they're the correct length
+    // TODO Maybe we should warn here if there's a length mismatch
+    times && times.length === keyframeValues.length
+        ? times
+        : defaultOffset(keyframeValues), duration);
+    const mapTimeToKeyframe = interpolate(absoluteTimes, keyframeValues, {
+        ease: Array.isArray(easingFunctions)
+            ? easingFunctions
+            : defaultEasing(keyframeValues, easingFunctions),
+    });
+    return {
+        calculatedDuration: duration,
+        next: (t) => {
+            state.value = mapTimeToKeyframe(t);
+            state.done = t >= duration;
+            return state;
+        },
+    };
+}
+
+export { defaultEasing, keyframes };