we ball I guess

types/animation/animation.d.ts

@@ -0,0 +1,61 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+/** A single keyframe descriptor passed to the Animation constructor. */
+interface AnimationKeyframe {
+  /** Time offset in seconds. */
+  time: number;
+  /** Value at this keyframe. */
+  value: number;
+  /** Easing type (EASING_* constant). Defaults to EASING_LINEAR. */
+  easing?: number;
+}
+
+/** Keyframe-based float animation. */
+interface AnimationInstance {
+  /**
+   * Interpolates the animation at the given time.
+   * @param time Time in seconds.
+   * @returns Interpolated value.
+   */
+  getValue(time: number): number;
+}
+
+/** Constructs a new Animation from an array of keyframe descriptors. */
+declare var Animation: {
+  new (keyframes: AnimationKeyframe[]): AnimationInstance;
+};
+
+/** Easing function utilities. */
+interface EasingNamespace {
+  /**
+   * Applies the given easing function to normalized time t.
+   * @param type An EASING_* constant.
+   * @param t Normalized time in [0, 1].
+   * @returns Eased value in [0, 1].
+   */
+  apply(type: number, t: number): number;
+}
+
+declare var Easing: EasingNamespace;
+
+declare var EASING_LINEAR: number;
+declare var EASING_IN_SINE: number;
+declare var EASING_OUT_SINE: number;
+declare var EASING_IN_OUT_SINE: number;
+declare var EASING_IN_QUAD: number;
+declare var EASING_OUT_QUAD: number;
+declare var EASING_IN_OUT_QUAD: number;
+declare var EASING_IN_CUBIC: number;
+declare var EASING_OUT_CUBIC: number;
+declare var EASING_IN_OUT_CUBIC: number;
+declare var EASING_IN_QUART: number;
+declare var EASING_OUT_QUART: number;
+declare var EASING_IN_OUT_QUART: number;
+declare var EASING_IN_BACK: number;
+declare var EASING_OUT_BACK: number;
+declare var EASING_IN_OUT_BACK: number;