# `@lexical/internal`

> [!WARNING]
> This package contains **internal** utilities shared across the Lexical
> packages: `invariant`/`devInvariant`, dev/prod error- and warning-message
> formatting, `warnOnlyOnce`, and the `LEXICAL_VERSION` constant. These are
> bound to the build's transforms and are inlined into every other package
> rather than shipped as a runtime dependency, so it is published only so the
> modules resolve through normal package resolution — including the `source`
> export condition used when developing against a linked checkout.
>
> It is **not** a public API. Import from `lexical` and the `@lexical/*`
> feature packages instead. Nothing here follows semver and any export may
> change or disappear without notice.