w3sper: Add a build step

Resolves #2612

w3sper.js/deno.json

@@ -1,5 +1,6 @@
 {
-   "tasks": {
-     "test": "deno test --allow-read --allow-net --allow-write --allow-run --trace-leaks"
-   }
+  "tasks": {
+    "build": "deno run --allow-write --allow-read scripts/build.ts",
+    "test": "deno test --allow-read --allow-net --allow-write --allow-run --trace-leaks"
+  }
 }

w3sper.js/scripts/build.ts

@@ -0,0 +1,45 @@
+import { build, stop } from "https://deno.land/x/esbuild/mod.js";
+
+const entryPoint = "./src/mod.js";
+
+const outputDir = "./dist";
+const outputFile = `${outputDir}/w3sper.js`;
+
+if (Deno.statSync(outputDir).isDirectory) {
+  Deno.removeSync(outputDir, { recursive: true });
+}
+
+Deno.mkdirSync(outputDir, { recursive: true });
+
+// Build the SDK using esbuild
+const result = await build({
+  entryPoints: [entryPoint],
+  outfile: outputFile,
+  bundle: true,
+  minify: false,
+  format: "esm",
+  sourcemap: true,
+});
+
+console.log("w3sper SDK has been built:", result);
+
+stop();
+
+const packageJsonContent = {
+  name: "@dusk-network/w3sper.js",
+  version: "0.0.1",
+  main: "w3sper.js",
+  type: "module",
+  exports: {
+    ".": "./w3sper.js",
+  },
+};
+
+const packageJsonPath = "./dist/package.json";
+
+Deno.writeTextFileSync(
+  packageJsonPath,
+  JSON.stringify(packageJsonContent, null, 2)
+);
+
+console.log("package.json has been generated:", packageJsonContent);