Improve support for styleSheets.

Author: megheaiulian

.changeset/thirty-clocks-hear.md

@@ -0,0 +1,5 @@
+---
+"@pionjs/pion": minor
+---
+
+Improve `styleSheets` support.

src/component.ts

@@ -19,6 +19,7 @@ type Atts<P> = readonly KebabCase<keyof P>[];
 interface Renderer<P extends object> extends GenericRenderer<HTMLElement, P> {
   (this: Component<P>, host: Component<P>): unknown | void;
   observedAttributes?: Atts<P>;
+  styleSheets?: (CSSStyleSheet | string)[];
 }
 
 type Component<P extends object> = HTMLElement & P;
@@ -98,9 +99,9 @@ function makeComponent(render: RenderFunction): Creator {
       observedAttributes = [],
       useShadowDOM = true,
       shadowRootInit = {},
-      styleSheets,
+      styleSheets: _styleSheets,
     } = options || (baseElementOrOptions as Options<P>) || {};
-
+    const styleSheets = sheets(renderer.styleSheets || _styleSheets);
     class Element extends BaseElement {
       _scheduler: Scheduler<P>;
 
@@ -117,7 +118,7 @@ function makeComponent(render: RenderFunction): Creator {
             mode: "open",
             ...shadowRootInit,
           });
-          if (styleSheets) shadowRoot.adoptedStyleSheets = sheets(styleSheets);
+          if (styleSheets) shadowRoot.adoptedStyleSheets = styleSheets;
           this._scheduler = new Scheduler(renderer, shadowRoot, this);
         }
       }

src/util.ts

@@ -4,8 +4,8 @@ export const sheet = (...styles: string[]) => {
   return cs;
 };
 
-export const sheets = (styleSheets: (string | CSSStyleSheet)[]) =>
-  styleSheets.map((style) => {
+export const sheets = (styleSheets?: (string | CSSStyleSheet)[]) =>
+  styleSheets?.map((style) => {
     if (typeof style === "string") return sheet(style);
     return style;
   });