Update tests and documentation

README.md

@@ -441,7 +441,7 @@ Of course, you can also use any other css-in-js library or by just using simple
 css to achieve almost anything you can imagine just by using the wrapper class
 as your root selector.
 
-## Fallback UIs
+### Fallback UIs
 
 Lets say you want to have a fallback UI in case the `sketch` ever falls out of
 sync or is undefined for some reason. If this is a use case for you then you
@@ -515,6 +515,115 @@ In this case, by default the fallback UI containing
 sketch, it will be rendered until you choose to once again "show nothing" which
 falls back to the fallback UI.
 
+### Error and Loading UIs
+
+Since version 4.4.0, it was possible to add a `fallback` prop, see the section
+on fallbacks.
+
+Since version 5 it is now possible to pass an `error` and `loading` prop to the
+wrapper which allow the user to pass different UIs for error and loading states.
+
+- The `error` state will trigger if the sketch or the wrapper encounter an
+  issue, otherwise a default error view will be shown.
+- The `loading` state will trigger while the wrapper is being lazy loaded,
+  otherwise a default loading view will be shown.
+
+#### Error UIs
+
+To show a custom UI when an error occurs within the sketch or the wrapper, you
+can pass a lazy function to the `error` prop.
+
+```tsx
+import * as React from "react";
+import { P5CanvasInstance, ReactP5Wrapper } from "@p5-wrapper/react";
+
+// This child will throw an error, oh no!
+function ErrorChild() {
+  throw new Error("oops");
+}
+
+// This view will catch the thrown error and give you access to what exactly was thrown.
+function ErrorUI(error: any) {
+  if (error instanceof Error) {
+    return <p>An error occured: {error.message}</p>;
+  }
+
+  return <p>An unknown error occured: {error.toString()}</p>;
+}
+
+function sketch(p5: P5CanvasInstance) {
+  p5.setup = () => p5.createCanvas(600, 400, p5.WEBGL);
+
+  p5.draw = () => {
+    p5.background(250);
+    p5.normalMaterial();
+    p5.push();
+    p5.rotateZ(p5.frameCount * 0.01);
+    p5.rotateX(p5.frameCount * 0.01);
+    p5.rotateY(p5.frameCount * 0.01);
+    p5.plane(100);
+    p5.pop();
+  };
+}
+
+export function App() {
+  return (
+    <ReactP5Wrapper sketch={sketch} error={ErrorUI}>
+      <ErrorChild />
+    </ReactP5Wrapper>
+  );
+}
+```
+
+Instead of the sketch, this will render `<p>An error occured: oops</p>`. Note
+that in truth, the `ErrorView` will **always** receive `any` values since JS /
+TS allow you to `throw` whatever values you want to, this is why we have to add
+the `error instanceof Error` check to be sure the value we got was actually an
+`Error` instance and not some other value like a `number`, `string`, `object` or
+anything else that could be thrown by JS / TS.
+
+As mentioned above, the `error` state will trigger if the sketch or the wrapper
+encounter an issue, otherwise a default error view will be shown.
+
+#### Loading UIs
+
+To show a custom UI while the sketch UI is being lazy loaded, you can pass a
+lazy function to the `loading` prop.
+
+```tsx
+import * as React from "react";
+import { P5CanvasInstance, ReactP5Wrapper } from "@p5-wrapper/react";
+
+function LoadingUI() {
+  return <p>The sketch is being loaded.</p>;
+}
+
+function sketch(p5: P5CanvasInstance) {
+  p5.setup = () => p5.createCanvas(600, 400, p5.WEBGL);
+
+  p5.draw = () => {
+    p5.background(250);
+    p5.normalMaterial();
+    p5.push();
+    p5.rotateZ(p5.frameCount * 0.01);
+    p5.rotateX(p5.frameCount * 0.01);
+    p5.rotateY(p5.frameCount * 0.01);
+    p5.plane(100);
+    p5.pop();
+  };
+}
+
+export function App() {
+  return <ReactP5Wrapper sketch={sketch} loading={LoadingUI} />;
+}
+```
+
+In the initial period between the sketch render starting and it's lazy loading
+ending, the `LoadingUI` will be shown!
+
+As mentioned above, the `loading` state will trigger while the wrapper is being
+lazy loaded, otherwise a default loading view will be shown.
+
 ## P5 plugins and constructors
 
 As discussed in multiple issues such as

config/eslint/eslint.config.js

@@ -0,0 +1,16 @@
+import eslint from "@eslint/js";
+import { dirname } from "path";
+import tseslint from "typescript-eslint";
+
+export default tseslint.config(
+  eslint.configs.recommended,
+  ...tseslint.configs.recommended,
+  {
+    languageOptions: {
+      parserOptions: {
+        project: true,
+        tsconfigRootDir: dirname(dirname(import.meta.dirname))
+      }
+    }
+  }
+);

config/typescript/tsconfig.json

@@ -17,8 +17,9 @@
     "resolveJsonModule": true,
     "isolatedModules": true,
     "noEmit": false,
-    "jsx": "react-jsx"
+    "jsx": "react-jsx",
+    "noImplicitAny": true
   },
-  "include": ["../../src", "../../tests"],
+  "include": ["../../src", "../../tests", "../../config"],
   "references": [{ "path": "./tsconfig.node.json" }]
 }

package.json

@@ -31,7 +31,7 @@
     "dev": "vite --config config/vite/vite.demo.config.ts --host",
     "format": "pnpm prettier --write .",
     "format:check": "pnpm prettier --check .",
-    "lint": "eslint  --ignore-pattern .gitignore --config config/eslint/eslint.json .",
+    "lint": "eslint  --ignore-pattern .gitignore --config config/eslint/eslint.config.js .",
     "lint:fix": "pnpm lint --fix",
     "prettier": "prettier --config config/prettier/prettier.json --ignore-path .gitignore",
     "test": "vitest run --config config/vite/vite.component.config.ts",
@@ -88,7 +88,7 @@
     "react-dom": ">= 18.2.0"
   },
   "devDependencies": {
-    "@testing-library/jest-dom": "^6.4.3",
+    "@testing-library/jest-dom": "6.4.2",
     "@testing-library/react": "^15.0.6",
     "@trivago/prettier-plugin-sort-imports": "^4.3.0",
     "@types/jest": "^29.5.12",
@@ -107,6 +107,7 @@
     "prettier": "^3.2.5",
     "rimraf": "^5.0.5",
     "typescript": "^5.4.5",
+    "typescript-eslint": "^7.8.0",
     "vite": "^5.2.11",
     "vitest": "^1.5.3",
     "vitest-canvas-mock": "^0.3.3"

src/components/ReactP5WrapperGuard.tsx

@@ -8,6 +8,7 @@ import { logErrorBoundaryError } from "../utils/logErrorBoundaryError";
 const ReactP5WrapperWithSketch = React.lazy(
   () => import("./ReactP5WrapperWithSketch")
 );
+
 const ErrorBoundary = React.lazy(() =>
   import("react-error-boundary").then(m => ({
     default: m.ErrorBoundary
@@ -34,7 +35,11 @@ export default function ReactP5WrapperGuard<
       }}
       onError={logErrorBoundaryError}
     >
-      <React.Suspense fallback={props.loading?.() ?? <p>🚀 Loading...</p>}>
+      <React.Suspense
+        fallback={
+          props.loading?.() ?? <p data-testid="loading">🚀 Loading...</p>
+        }
+      >
         <ReactP5WrapperWithSketch
           /** @see https://github.com/P5-wrapper/react/issues/207 */
           {...(props as unknown as P5WrapperPropsWithSketch<Props>)}