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check

Fails when the distribution ships anything older than the one it extends.

pnpm dist check

Run it in CI.

@acme/core extends @fairgarden/core, so it cannot ship anything older:
  @fg/id 1.1.0 is older than the 1.2.3 @fairgarden/core ships
An extension may move ahead of what it extends, never behind it.
`pnpm dist bump` moves a module to its newest release; a fork, by merging upstream's.

A module the parent ships and this does not is a violation too; inherit adds it.

@acme/core@26.09.01 ships nothing older than @fairgarden/core@26.6.1.

Exit codes

0nothing is behind, or this distribution extends nothing
1something is behind, or the parent is declared but not installed

A declared parent that is not installed fails rather than passing quietly — otherwise a missing install would look like a clean check.

Why a separate command

Where a distribution has a monolith, withMonolith already refuses to build on a violation. A distribution whose apps deploy separately has no such build, so this is what enforces the floor there.

sync reports the same thing alongside everything else; check is the one that exits non-zero.