chore: setup CustomEvent polyfill

package.json

@@ -16,7 +16,8 @@
     "packages/tests",
     "packages/browser-tests",
     "packages/build-utils",
-    "packages/react-native-polyfills"
+    "packages/react-native-polyfills",
+    "packages/custom-event-polyfill"
   ],
   "scripts": {
     "prepare": "husky",

packages/custom-event-polyfill/.eslintrc.cjs

@@ -0,0 +1,6 @@
+module.exports = {
+  parserOptions: {
+    tsconfigRootDir: __dirname,
+    project: "./tsconfig.dev.json"
+  }
+};

packages/custom-event-polyfill/CHANGELOG.md

@@ -0,0 +1,10 @@
+# Changelog
+
+## 0.0.1 (2024-04-09)
+
+
+### Features
+
+* Add react-native polyfills ([#1915](https://github.com/waku-org/js-waku/issues/1915)) ([9be942f](https://github.com/waku-org/js-waku/commit/9be942fc23e1e6c1ed5775e44e0d77ec7627b38c))
+
+## Changelog

packages/custom-event-polyfill/package.json

@@ -0,0 +1,43 @@
+{
+  "name": "@waku/custom-event-polyfill",
+  "version": "0.0.1",
+  "description": "CustomEvent polyfill for environments that don't support it natively",
+  "module": "./dist/index.js",
+  "exports": {
+    ".": "./dist/index.js"
+  },
+  "type": "module",
+  "homepage": "https://github.com/waku-org/js-waku/tree/master/packages/custom-event-polyfill#readme",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/waku-org/js-waku.git"
+  },
+  "bugs": {
+    "url": "https://github.com/waku-org/js-waku/issues"
+  },
+  "license": "MIT OR Apache-2.0",
+  "keywords": [
+    "waku",
+    "custom-event",
+    "polyfill",
+    "web3"
+  ],
+  "scripts": {
+    "build": "tsc",
+    "check": "run-s check:*",
+    "check:tsc": "tsc -p tsconfig.dev.json",
+    "check:spelling": "cspell \"{README.md,src/**/*.ts}\"",
+    "prepublish": "npm run build"
+  },
+  "engines": {
+    "node": ">=18"
+  },
+  "files": [
+    "dist",
+    "src/**/*.ts",
+    "!**/*.json",
+    "CHANGELOG.md",
+    "LICENSE",
+    "README.md"
+  ]
+}

packages/custom-event-polyfill/src/index.ts

@@ -0,0 +1,12 @@
+if (typeof CustomEvent === "undefined") {
+  class CustomEvent<T = unknown> extends Event {
+    public detail: T;
+
+    public constructor(type: string, eventInitDict?: CustomEventInit<T>) {
+      super(type, eventInitDict);
+      this.detail = eventInitDict?.detail ?? (null as T);
+    }
+  }
+
+  (globalThis as Record<string, unknown>).CustomEvent = CustomEvent;
+}

packages/custom-event-polyfill/tsconfig.dev.json

@@ -0,0 +1,3 @@
+{
+  "extends": "../../tsconfig.dev"
+}

packages/custom-event-polyfill/tsconfig.json

@@ -0,0 +1,10 @@
+{
+  "extends": "../../tsconfig",
+  "compilerOptions": {
+    "outDir": "dist/",
+    "rootDir": "src",
+    "tsBuildInfoFile": "dist/.tsbuildinfo"
+  },
+  "include": ["src"],
+  "exclude": ["src/**/*.spec.ts", "src/test_utils"]
+}