fix: optimize iife bundle output

evanw/esbuild#2416

package.json

@@ -19,7 +19,7 @@
     "lint": "npx eslint src/*.js",
     "test": "wet run",
     "dev": "wet serve --redirect :examples/ & npm run build -- --watch",
-    "build": "esbuild src/polyfill.js --global-name=SelectMenuPolyfill --outdir=dist --bundle --minify-syntax --tree-shaking=true",
+    "build": "esbuild src/polyfill.js --outdir=dist --bundle --minify-syntax --tree-shaking=true",
     "prepublishOnly": "npm run build"
   },
   "devDependencies": {

src/option.js

@@ -35,9 +35,6 @@ template.innerHTML = /* html */`
 `;
 
 class OptionElement extends globalThis.HTMLElement {
-  static formAssociated = true;
-  static observedAttributes = ['disabled', 'selected'];
-
   /** @see https://html.spec.whatwg.org/multipage/form-elements.html#concept-option-dirtiness */
   #dirty = false;
   #internals;
@@ -146,6 +143,11 @@ class OptionElement extends globalThis.HTMLElement {
   }
 }
 
+// Define as an external static so esbuild doesn't add unnecessary transforms
+// see https://github.com/evanw/esbuild/issues/2416
+OptionElement.formAssociated = true;
+OptionElement.observedAttributes = ['disabled', 'selected'];
+
 if (!globalThis.customElements.get('x-option')) {
   globalThis.customElements.define('x-option', OptionElement);
 }

src/selectmenu.js

@@ -127,9 +127,6 @@ template.innerHTML = /* html */`
 `;
 
 class SelectMenuElement extends globalThis.HTMLElement {
-  static formAssociated = true;
-  static observedAttributes = ['disabled', 'required', 'multiple'];
-
   #internals;
 
   constructor() {
@@ -464,6 +461,11 @@ class SelectMenuElement extends globalThis.HTMLElement {
   }
 }
 
+// Define as an external static so esbuild doesn't add unnecessary transforms
+// see https://github.com/evanw/esbuild/issues/2416
+SelectMenuElement.formAssociated = true;
+SelectMenuElement.observedAttributes = ['disabled', 'required', 'multiple'];
+
 function reposition(reference, popover) {
 
   let { style } = getCSSRule(reference.shadowRoot,