upgrade Electron 39→42 and fix Hyprland overlay z-order/placement (#79)

launcher/test-support/exit-intercept.ts

@@ -0,0 +1,47 @@
+export class ExitSignal extends Error {
+  code: number;
+  stderr: string;
+
+  constructor(code: number, stderr: string) {
+    super(`exit:${code}`);
+    this.code = code;
+    this.stderr = stderr;
+  }
+}
+
+function stderrChunkToString(chunk: string | Uint8Array, encoding?: BufferEncoding): string {
+  if (typeof chunk === 'string') return chunk;
+  return Buffer.from(chunk).toString(encoding);
+}
+
+export function withProcessExitIntercept(callback: () => void): ExitSignal {
+  const originalExit = process.exit;
+  const originalStderrWrite = process.stderr.write;
+  let stderr = '';
+
+  try {
+    process.stderr.write = ((chunk: string | Uint8Array, ...args: unknown[]) => {
+      const encoding = typeof args[0] === 'string' ? (args[0] as BufferEncoding) : undefined;
+      stderr += stderrChunkToString(chunk, encoding);
+      const writeCallback = args.find((arg): arg is (error?: Error | null) => void => {
+        return typeof arg === 'function';
+      });
+      writeCallback?.();
+      return true;
+    }) as typeof process.stderr.write;
+    process.exit = ((code?: number) => {
+      throw new ExitSignal(code ?? 0, stderr);
+    }) as typeof process.exit;
+    callback();
+  } catch (error) {
+    if (error instanceof ExitSignal) {
+      return error;
+    }
+    throw error;
+  } finally {
+    process.stderr.write = originalStderrWrite;
+    process.exit = originalExit;
+  }
+
+  throw new Error('expected process.exit');
+}