refactor(web): remove resize observer action (#26647)

web/src/lib/actions/resize-observer.ts

@@ -1,43 +0,0 @@
-export type OnResizeCallback = (resizeEvent: { target: HTMLElement; width: number; height: number }) => void;
-
-let observer: ResizeObserver;
-let callbacks: WeakMap<HTMLElement, OnResizeCallback>;
-
-/**
- * Installs a resizeObserver on the given element - when the element changes
- * size, invokes a callback function with the width/height. Intended as a
- * replacement for bind:clientWidth and bind:clientHeight in svelte4 which use
- * an iframe to measure the size of the element, which can be bad for
- * performance and memory usage. In svelte5, they adapted bind:clientHeight and
- * bind:clientWidth to use an internal resize observer.
- *
- * TODO: When svelte5 is ready, go back to bind:clientWidth and
- * bind:clientHeight.
- */
-export function resizeObserver(element: HTMLElement, onResize: OnResizeCallback) {
-  if (!observer) {
-    callbacks = new WeakMap();
-    observer = new ResizeObserver((entries) => {
-      for (const entry of entries) {
-        const onResize = callbacks.get(entry.target as HTMLElement);
-        if (onResize) {
-          onResize({
-            target: entry.target as HTMLElement,
-            width: entry.borderBoxSize[0].inlineSize,
-            height: entry.borderBoxSize[0].blockSize,
-          });
-        }
-      }
-    });
-  }
-
-  callbacks.set(element, onResize);
-  observer.observe(element);
-
-  return {
-    destroy: () => {
-      callbacks.delete(element);
-      observer.unobserve(element);
-    },
-  };
-}