init: add source code from src.zip

src/cli/exit.ts

@@ -0,0 +1,31 @@
+/**
+ * CLI exit helpers for subcommand handlers.
+ *
+ * Consolidates the 4-5 line "print + lint-suppress + exit" block that was
+ * copy-pasted ~60 times across `claude mcp *` / `claude plugin *` handlers.
+ * The `: never` return type lets TypeScript narrow control flow at call sites
+ * without a trailing `return`.
+ */
+/* eslint-disable custom-rules/no-process-exit -- centralized CLI exit point */
+
+// `return undefined as never` (not a post-exit throw) — tests spy on
+// process.exit and let it return. Call sites write `return cliError(...)`
+// where subsequent code would dereference narrowed-away values under mock.
+// cliError uses console.error (tests spy on console.error); cliOk uses
+// process.stdout.write (tests spy on process.stdout.write — Bun's console.log
+// doesn't route through a spied process.stdout.write).
+
+/** Write an error message to stderr (if given) and exit with code 1. */
+export function cliError(msg?: string): never {
+  // biome-ignore lint/suspicious/noConsole: centralized CLI error output
+  if (msg) console.error(msg)
+  process.exit(1)
+  return undefined as never
+}
+
+/** Write a message to stdout (if given) and exit with code 0. */
+export function cliOk(msg?: string): never {
+  if (msg) process.stdout.write(msg + '\n')
+  process.exit(0)
+  return undefined as never
+}