Unexpected token error blocks PostCSS integration testing without production credentials

The objective is to verify that a minimal PostCSS configuration can trigger a parsing error such as “Unexpected token” before any plugin that depends on production credentials is executed.

Key constraints include the lack of standardized plugin execution order across PostCSS versions and the default disabling of source maps, which may obscure error locations when credentials are unavailable.

Questions: 1. Does the “Unexpected token” error manifest prior to credential‑dependent plugins in a credential‑free pipeline? 2. How does varying plugin order affect the presence or absence of this error across different PostCSS releases? 3. Can source maps be enabled to retain original line numbers for debugging in such tests?