feat: convert to typescript

package.json

@@ -1,6 +1,6 @@
 {
   "name": "atom-ide-signature-help",
-  "main": "./lib/main.js",
+  "main": "./dist/main.js",
   "version": "0.14.1",
   "description": "A replacement of the SignatureHelp functionality from the original Atom-IDE / Nuclide package developed by Facebook.",
   "keywords": [
@@ -15,6 +15,9 @@
   },
   "scripts": {
     "format": "prettier --write .",
+    "clean": "shx rm -rf dist",
+    "dev": "npm run clean && cross-env NODE_ENV=development cross-env BABEL_KEEP_MODULES=true rollup -c -w",
+    "build": "npm run clean && cross-env NODE_ENV=production cross-env BABEL_KEEP_MODULES=true rollup -c",
     "bump": "ncu -u"
   },
   "package-deps": [
@@ -30,6 +33,11 @@
     "@types/node": "^14.14.22",
     "prettier": "^2.2.1",
     "npm-check-updates": "^11.1.1",
+    "rollup": "^2.38.5",
+    "rollup-plugin-atomic": "^2.0.1",
+    "shx": "^0.3.3",
+    "tslib": "^2.1.0",
+    "typescript": "^4.1.3",
     "build-commit": "^0.1.4"
   },
   "activationHooks": [

rollup.config.js

@@ -0,0 +1,19 @@
+import { createPlugins } from "rollup-plugin-atomic"
+
+const plugins = createPlugins([["ts", { tsconfig: "./lib/tsconfig.json" }, true], "js", "json"])
+
+export default [
+  {
+    input: "lib/main.ts",
+    output: [
+      {
+        dir: "dist",
+        format: "cjs",
+        sourcemap: true,
+      },
+    ],
+    // loaded externally
+    external: ["atom"],
+    plugins: plugins,
+  },
+]

src/tsconfig.json

@@ -0,0 +1,32 @@
+{
+  "compilerOptions": {
+    "strict": true,
+    "strictNullChecks": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noImplicitReturns": true,
+    "noImplicitAny": true,
+    "noImplicitThis": true,
+    "noFallthroughCasesInSwitch": true,
+    "declaration": true,
+    "emitDecoratorMetadata": true,
+    "experimentalDecorators": true,
+    "incremental": true,
+    "inlineSourceMap": true,
+    "inlineSources": true,
+    "preserveSymlinks": true,
+    "removeComments": true,
+    "jsx": "react",
+    "jsxFactory": "etch.dom",
+    "lib": ["ES2018", "dom"],
+    "target": "ES2018",
+    "allowJs": true,
+    "esModuleInterop": true,
+    "resolveJsonModule": true,
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "importHelpers": false,
+    "outDir": "../dist"
+  },
+  "compileOnSave": false
+}