fix(cli): resolve npx shims on Windows (#1626)

packages/cli/src/utils/npxCommand.ts

@@ -0,0 +1,17 @@
+export type NpxCommand = {
+  command: string;
+  args: string[];
+};
+
+export function buildNpxCommand(
+  args: readonly string[],
+  platform: NodeJS.Platform = process.platform,
+): NpxCommand {
+  if (platform === "win32") {
+    // npm installs npx as a .cmd shim on Windows; invoke it through cmd.exe
+    // instead of relying on child_process to resolve or execute the shim.
+    return { command: "cmd.exe", args: ["/d", "/s", "/c", "npx.cmd", ...args] };
+  }
+
+  return { command: "npx", args: [...args] };
+}