wip: generate type declarations

Closes #65

package.json

@@ -4,20 +4,22 @@
   "description": "Library for creating bpmn-io properties panels.",
   "main": "dist/index.js",
   "module": "dist/index.esm.js",
+  "types": "dist/types/index.d.ts",
   "files": [
     "dist",
     "assets",
     "preact"
   ],
   "scripts": {
     "all": "run-s lint build test",
-    "build": "del-cli preact dist && rollup -c",
+    "build": "del-cli preact dist && rollup -c && npm run generate-types",
     "build:watch": "rollup -c --watch",
     "lint": "eslint .",
     "dev": "npm test -- --auto-watch --no-single-run",
     "test": "karma start karma.config.js",
     "prepublishOnly": "run-s build",
-    "prepare": "run-s build"
+    "prepare": "run-s build",
+    "generate-types": "tsc"
   },
   "repository": {
     "type": "git",
@@ -82,6 +84,7 @@
     "sinon": "^11.1.1",
     "sinon-chai": "^3.7.0",
     "sirv-cli": "^1.0.12",
+    "typescript": "^4.5.4",
     "webpack": "^5.38.1"
   }
 }

tsconfig.json

@@ -0,0 +1,29 @@
+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "lib": [
+      "es2019",
+      "dom"
+    ],
+    "target": "es2019",
+    "allowJs": true,
+    "checkJs": true,
+    "rootDir": ".",
+    "strict": false,
+    "skipLibCheck": true,
+    "esModuleInterop": true,
+    "resolveJsonModule": true,
+    "jsx": "react-jsx",
+    "jsxImportSource": "preact",
+    "outDir": "./dist/types",
+    "declaration": true,
+    "emitDeclarationOnly": true,
+    "removeComments": false
+  },
+  "include": [
+    "src/index.js"
+  ],
+  "exclude": [
+    "node_modules"
+  ]
+}