👷‍ Add typescript with minimal setup

jest.config.js

@@ -37,7 +37,7 @@ module.exports = {
 
   // A map from regular expressions to paths to transformers
   transform: {
-    '^.+\\.js$': 'babel-jest',
+    '\\.[jt]s?$': 'babel-jest',
     '^.+\\.svelte$': [
       'svelte-jester',
       {

package.json

@@ -58,6 +58,7 @@
     "@babel/core": "^7.23.5",
     "@babel/preset-env": "^7.23.5",
     "@release-it-plugins/lerna-changelog": "^6.1.0",
+    "@rollup/plugin-typescript": "^11.1.6",
     "@testing-library/jest-dom": "^5.17.0",
     "@testing-library/svelte": "^3.2.2",
     "autoprefixer": "^10.4.16",
@@ -113,7 +114,8 @@
     "svelte": "^3.59.2",
     "svelte-jester": "^2.3.2",
     "svelte-preprocess": "^5.1.3",
-    "tailwindcss": "^3.4.1"
+    "tailwindcss": "^3.4.1",
+    "typescript": "^5.3.3"
   },
   "engines": {
     "node": "18.* || >= 20"

rollup.config.js

@@ -12,6 +12,7 @@ import resolve from 'rollup-plugin-node-resolve';
 import sveltePreprocess from 'svelte-preprocess';
 import svelte from 'rollup-plugin-svelte';
 import visualizer from 'rollup-plugin-visualizer';
+import typescript from '@rollup/plugin-typescript';
 
 const pkg = require('./package.json');
 const banner = ['/*!', pkg.name, pkg.version, '*/\n'].join(' ');
@@ -20,12 +21,13 @@ const env = process.env.DEVELOPMENT ? 'development' : 'production';
 
 const plugins = [
   svelte({
-    preprocess: sveltePreprocess(),
+    preprocess: sveltePreprocess({ typescript: true }),
     emitCss: true
   }),
   resolve({
-    extensions: ['.js', '.json', '.svelte']
+    extensions: ['.js', '.json', '.svelte', '.ts']
   }),
+  typescript(),
   commonjs(),
   replace({
     'process.env.NODE_ENV': JSON.stringify(env)
@@ -95,12 +97,13 @@ if (!process.env.DEVELOPMENT) {
       ],
       plugins: [
         svelte({
-          preprocess: sveltePreprocess(),
+          preprocess: sveltePreprocess({ typescript: true }),
           emitCss: true
         }),
         resolve({
-          extensions: ['.js', '.json', '.svelte']
+          extensions: ['.js', '.json', '.svelte', '.ts']
         }),
+        typescript(),
         commonjs(),
         replace({
           'process.env.NODE_ENV': JSON.stringify(env)

tsconfig.json

@@ -0,0 +1,16 @@
+{
+  "compilerOptions": {
+    "target": "esnext",
+    "module": "esnext",
+    "typeRoots": ["./src/types"],
+    "types": ["shepherd.js"],
+    "outDir": "dist",
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "strict": true,
+    "skipLibCheck": true,
+    "allowJs": true
+  },
+  "include": ["src"],
+  "exclude": ["node_modules"]
+}