chore: remove internal functions from svelte/transition exports (#10132)

* chore: remove internal functions from `svelte/transition` exports

* regenerate types

Author: brunnerh

.changeset/lucky-toes-begin.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+chore: remove internal functions from `svelte/transition` exports

packages/svelte/src/transition/index.js

@@ -12,14 +12,14 @@ function cubic_out(t) {
  * @param {number} t
  * @returns {number}
  */
-export function cubic_in_out(t) {
+function cubic_in_out(t) {
 	return t < 0.5 ? 4.0 * t * t * t : 0.5 * Math.pow(2.0 * t - 2.0, 3.0) + 1.0;
 }
 
 /** @param {number | string} value
  * @returns {[number, string]}
  */
-export function split_css_unit(value) {
+function split_css_unit(value) {
 	const split = typeof value === 'string' && value.match(/^\s*(-?[\d.]+)([^\s]*)\s*$/);
 	return split ? [parseFloat(split[1]), split[2] || 'px'] : [/** @type {number} */ (value), 'px'];
 }

packages/svelte/types/index.d.ts

@@ -2079,12 +2079,6 @@ declare module 'svelte/transition' {
 		duration?: number | ((len: number) => number);
 		easing?: EasingFunction;
 	}
-	/**
-	 * https://svelte.dev/docs/svelte-easing
-	 * */
-	export function cubic_in_out(t: number): number;
-
-	export function split_css_unit(value: number | string): [number, string];
 	/**
 	 * Animates a `blur` filter alongside an element's opacity.
 	 *