preserveMomentum in milliseconds

Author: Rich-Harris

packages/svelte/src/motion/spring.js

@@ -229,7 +229,7 @@ export class Spring {
 		if (!this.#task) {
 			this.#last_time = raf.now();
 
-			var inv_mass_recovery_rate = 1 / (this.#momentum * 60);
+			var inv_mass_recovery_rate = 1000 / (this.#momentum * 60);
 
 			this.#task ??= loop((now) => {
 				this.#inverse_mass = Math.min(this.#inverse_mass + inv_mass_recovery_rate, 1);
@@ -268,7 +268,7 @@ export class Spring {
 	 * If `options.instant` is `true`, `spring.current` immediately matches `spring.target`.
 	 *
 	 * If `options.preserveMomentum` is provided, the spring will continue on its current trajectory for
-	 * the specified number of seconds. This is useful for things like 'fling' gestures.
+	 * the specified number of milliseconds. This is useful for things like 'fling' gestures.
 	 *
 	 * @param {T} value
 	 * @param {{ instant?: boolean; preserveMomentum?: number }} [options]

packages/svelte/types/index.d.ts

@@ -1737,14 +1737,14 @@ declare module 'svelte/motion' {
 		 * If `options.instant` is `true`, `spring.current` immediately matches `spring.target`.
 		 *
 		 * If `options.preserveMomentum` is provided, the spring will continue on its current trajectory for
-		 * the specified number of seconds. This is useful for things like 'fling' gestures.
+		 * the specified number of milliseconds. This is useful for things like 'fling' gestures.
 		 *
 		 * 
 		 */
 		set(value: T, options?: {
 			instant?: boolean;
 			preserveMomentum?: number;
-		} | undefined): Promise<any>;
+		} | undefined): Promise<unknown>;
 		get current(): T;
 		set damping(v: number);
 		get damping(): number;