Reference

Predicates

The fixed vocabulary of 8 conditions Pich can check in files.

SERV may only use these 8 predicates. Each is observed as present, absent, or unknown.

Predicate	How Pich observes it
`app_router`	An app/ or src/app/ directory exists
`pages_router`	A pages/ or src/pages/ directory exists
`middleware_present`	middleware.(ts\|js) or proxy.(ts\|js) at the root or in src/
`middleware_enforces_auth`	That file checks a session, token, or cookie and then redirects or returns 401/403
`deployment_on_vercel`	Read from pich.deploy.json hosting; unknown if the file is missing
`turbopack_build`	From the build script (--turbopack / --webpack) or the installed version’s default; unknown for custom build scripts
`i18n_configured`	next.config declares an i18n block
`i18n_single_locale`	i18n.locales is a literal array with exactly one entry; unknown if not a literal

Declaring hosting

Hosting cannot be seen from code, so Pich reads an optional file at the app root:

pich.deploy.json

{ "hosting": "self-hosted", "platform": "docker on a VPS" }

Use "hosting": "vercel" for Vercel. Without this file, hosting is unknown.