Check for correct wasm-bindgen-cli version (#92)

Two people pushing to the same branch is fraught. Three people pushing
to the same branch is a circus. 😂 This should fix the build errors
in #88!

studio/scripts/run.mjs

@@ -1,5 +1,6 @@
 import chalk from "chalk";
 import cp from "node:child_process";
+import which from "which";
 
 /**
  * @param {string} command
@@ -25,3 +26,35 @@ export default function run(command, args, options) {
 			.on("error", reject);
 	});
 }
+
+/**
+ * @returns {Promise<string|null>}
+ */
+export async function wasmBindgenCliVersion() {
+	const exePath = await which("wasm-bindgen", { nothrow: true });
+	if (!exePath) return null;
+
+	return new Promise((resolve, reject) => {
+		let stdout = "";
+		let stderr = "";
+
+		const finish = code => {
+			if (code) reject(new Error(stderr));
+			else resolve(stdout);
+		}
+
+		const proc = cp.spawn(exePath, ["--version"], {
+			shell: true,
+			stdio: ["ignore", "pipe", "pipe"],
+		})
+		.on("exit", finish)
+		.on("close", finish)
+		.on("error", reject);
+
+		proc.stdout.setEncoding("utf-8");
+		proc.stdout.on("data", chunk => stdout += chunk);
+
+		proc.stderr.setEncoding("utf-8");
+		proc.stderr.on("data", chunk => stderr += chunk);
+	});
+}