Cap dev-runner output buffering

Co-Authored-By: Paperclip <noreply@paperclip.ing>

scripts/dev-runner.mjs

@@ -5,6 +5,7 @@ import path from "node:path";
 import { createInterface } from "node:readline/promises";
 import { stdin, stdout } from "node:process";
 import { fileURLToPath } from "node:url";
+import { createCapturedOutputBuffer } from "./dev-runner-output.mjs";
 import { shouldTrackDevServerPath } from "./dev-runner-paths.mjs";
 
 const mode = process.argv[2] === "watch" ? "watch" : "dev";
@@ -250,30 +251,33 @@ async function runPnpm(args, options = {}) {
     const spawned = spawn(pnpmBin, args, {
       stdio: options.stdio ?? ["ignore", "pipe", "pipe"],
       env: options.env ?? process.env,
+      cwd: options.cwd,
       shell: process.platform === "win32",
     });
 
-    let stdoutBuffer = "";
-    let stderrBuffer = "";
+    const stdoutBuffer = createCapturedOutputBuffer();
+    const stderrBuffer = createCapturedOutputBuffer();
 
     if (spawned.stdout) {
       spawned.stdout.on("data", (chunk) => {
-        stdoutBuffer += String(chunk);
+        stdoutBuffer.append(chunk);
       });
     }
     if (spawned.stderr) {
       spawned.stderr.on("data", (chunk) => {
-        stderrBuffer += String(chunk);
+        stderrBuffer.append(chunk);
       });
     }
 
     spawned.on("error", reject);
     spawned.on("exit", (code, signal) => {
+      const stdout = stdoutBuffer.finish();
+      const stderr = stderrBuffer.finish();
       resolve({
         code: code ?? 0,
         signal,
-        stdout: stdoutBuffer,
-        stderr: stderrBuffer,
+        stdout: stdout.text,
+        stderr: stderr.text,
       });
     });
   });