build: Configure Vite for library build and finalize package fields

- Add `vite-plugin-dts` dev dependency.
- Create `vite.config.ts` specifically for library build mode:
    - Configure ESM and UMD outputs (`dist/digiid-ts.es.js`, `dist/digiid-ts.umd.js`).
    - Set up `vite-plugin-dts` for generating `dist/index.d.ts`.
    - Externalize Node.js built-ins and 'digibyte-message' dependency.
- Update `package.json`:
    - Change `scripts.build` to `vite build`.
    - Point `main`, `module`, and `types` fields to the correct files in `dist/`.
- Run and verify the build process successfully generates the expected distribution files.

1 files changed, 37 insertions, 0 deletions

diff --git a/vite.config.ts b/vite.config.ts
new file mode 100644
index 0000000..a69cc50
--- /dev/null
+++ b/vite.config.ts
@@ -0,0 +1,37 @@
+import { defineConfig } from 'vite';
+import dts from 'vite-plugin-dts'; // Plugin to generate consolidated .d.ts file
+import { resolve } from 'path';
+
+// https://vitejs.dev/guide/build.html#library-mode
+export default defineConfig({
+  plugins: [
+    dts({ // Generate declaration files
+      insertTypesEntry: true, // Create a single entry point for types
+    }),
+  ],
+  build: {
+    lib: {
+      // Could also be a dictionary or array of multiple entry points
+      entry: resolve(__dirname, 'src/index.ts'),
+      name: 'DigiIDTs', // Global variable name in UMD build
+      formats: ['es', 'umd'], // Output formats (ES Module, Universal Module Definition)
+      fileName: (format) => `digiid-ts.${format}.js`, // Output file names
+    },
+    rollupOptions: {
+      // Make sure to externalize deps that shouldn't be bundled
+      // into your library (e.g., peer dependencies)
+      external: ['crypto', 'module', 'digibyte-message'], // Externalize Node built-ins and the core dependency
+      output: {
+        // Provide global variables to use in the UMD build
+        // for externalized deps
+        globals: {
+          crypto: 'crypto', // Map 'crypto' import to global 'crypto' (Node)
+          module: 'module', // Map 'module' import to global 'module' (Node)
+          'digibyte-message': 'DigibyteMessage' // Example global name if needed, might not be necessary for UMD if only used internally
+        },
+      },
+    },
+    sourcemap: true, // Generate source maps for debugging
+    emptyOutDir: true, // Clean the dist directory before building
+  },
+}); 
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