Add .d.ts files for improved TypeScript support

.gitignore

@@ -5,3 +5,6 @@ coverage
 
 # In case contributors use yarn (just prevent it from being committed). Standardizing on npm for broad compatibility.
 yarn.lock
+
+# Ignore autogenerated .d.ts (and associated .map) files since this are automatically generated prior to publish to NPM.
+*.d.ts*

README.md

@@ -153,6 +153,7 @@ Changes since forking from [`svelte-tag`](https://github.com/crisward/svelte-tag
 - Add step-by-step instructions and provided a simple MVP
 	example (https://github.com/patricknelson/svelte-retag/pull/24)
 - Automatically forward all attributes to component (i.e. `attributes: true`) (https://github.com/patricknelson/svelte-retag/issues/34)
+- Add better TypeScript support (https://github.com/patricknelson/svelte-retag/pull/33)
 
 ### v2
 

index.js

@@ -66,24 +66,29 @@ function renderElements(timestamp) {
 }
 
 
+/**
+ * @typedef {new(...args: any[]) => any} Newable         Type alias for a really generic class constructor
+ * @typedef {Newable}                    SvelteComponent Svelte component class constructor (basically a "newable" object)
+ */
+
 /**
  * Please see README.md for usage information.
  *
  * @param {object} opts Custom element options
  *
- * @param {any}                        opts.component  Svelte component instance to incorporate into your custom element.
- * @param {string}                     opts.tagname    Name of the custom element tag you'd like to define.
- * @param {string[]|boolean|undefined} opts.attributes Optional array of attributes that should be reactively forwarded to the component when modified. Set to true to automatically watch all attributes.
- * @param {boolean?}                   opts.shadow     Indicates if we should build the component in the shadow root instead of in the regular ("light") DOM.
- * @param {string?}                    opts.href       URL to the CSS stylesheet to incorporate into the shadow DOM (if enabled).
+ * @param {SvelteComponent}  opts.component       The Svelte component *class* constructor to incorporate into your custom element (this is the imported component class, *not* an instance)
+ * @param {string}           opts.tagname         Name of the custom element tag you'd like to define.
+ * @param {string[]|boolean} [opts.attributes=[]] Optional array of attributes that should be reactively forwarded to the component when modified. Set to true to automatically watch all attributes.
+ * @param {boolean}          [opts.shadow=false]  Indicates if we should build the component in the shadow root instead of in the regular ("light") DOM.
+ * @param {string}           [opts.href=""]       URL to the CSS stylesheet to incorporate into the shadow DOM (if enabled).
  *
  * Experimental:
- * @param {boolean?}   opts.hydratable Light DOM slot hydration (specific to svelte-retag): Enables pre-rendering of the
- *                                     web component (e.g. SSR) by adding extra markers (attributes & wrappers) during
- *                                     rendering to enable svelte-retag to find and restore light DOM slots when
- *                                     restoring interactivity.
+ * @param {boolean}  [opts.hydratable=false] Light DOM slot hydration (specific to svelte-retag): Enables pre-rendering of the
+ *                                           web component (e.g. SSR) by adding extra markers (attributes & wrappers) during
+ *                                           rendering to enable svelte-retag to find and restore light DOM slots when
+ *                                           restoring interactivity.
  *
- * @param {boolean|string?} opts.debugMode Hidden option to enable debugging for package development purposes.
+ * @param {boolean|string} [opts.debugMode=false] Hidden option to enable debugging for package development purposes.
  */
 export default function svelteRetag(opts) {
 	/**

package.json

@@ -3,11 +3,13 @@
   "version": "1.4.0",
   "description": "Light DOM custom element wrapper for Svelte 3 and 4 with slots, context and Vite HMR support",
   "main": "index.js",
+  "types": "./types/index.d.ts",
   "scripts": {
     "test": "npm run eslint && vitest run",
     "vitest": "vitest run",
     "eslint": "eslint index.js tests/*",
-    "pub": "npm run test && npm run eslint && npm publish"
+    "build": "tsc --emitDeclarationOnly",
+    "pub": "npm run test && npm run eslint && npm run build && npm publish"
   },
   "repository": {
     "type": "git",
@@ -23,6 +25,7 @@
     "eslint-plugin-svelte": "^2.35.1",
     "jsdom": "^22.1.0",
     "svelte": "^4.2.8",
+    "typescript": "^5.3.3",
     "vite": "^4.5.1",
     "vitest": "^0.25.8"
   },

tsconfig.json

@@ -0,0 +1,24 @@
+{
+	// Only needed for JS files in the project root (exclude vite config).
+	"include": ["*.js"],
+	"exclude": ["vite.config.js"],
+
+	// See: https://www.typescriptlang.org/docs/handbook/declaration-files/dts-from-js.html
+	"compilerOptions": {
+		// Tells TypeScript to read JS files, as
+		// normally they are ignored as source files
+		"allowJs": true,
+		// Generate d.ts files
+		"declaration": true,
+		// This compiler run should
+		// only output d.ts files
+		"emitDeclarationOnly": true,
+		// Types should go into this directory.
+		// Removing this would place the .d.ts files
+		// next to the .js files
+		"outDir": "types",
+		// go to js file when using IDE functions like
+		// "Go to Definition" in VSCode
+		"declarationMap": true
+	}
+}