diff --git a/cli.ts b/cli.ts
new file mode 100644
index 0000000..9f40712
--- /dev/null
+++ b/cli.ts
@@ -0,0 +1,18 @@
+import { SpawnSyncOptionsWithBufferEncoding, SpawnSyncReturns, spawnSync as rawSpawnSync } from "child_process";
+
+export function check(result: SpawnSyncReturns<Buffer | string>) {
+    if (result.error)
+        throw result.error;
+    if (result.status !== 0) {
+        throw result.stderr;
+    }
+    return result;
+}
+
+export function checkedSpawnSync(
+    command: string,
+    args: readonly string[],
+    options: SpawnSyncOptionsWithBufferEncoding,
+): SpawnSyncReturns<Buffer | string> {
+    return check(rawSpawnSync(command, args, options));
+}