vapor-chamber API reference - v1.16.0
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    Variable HARD_NAV_CODESConst

    HARD_NAV_CODES: ReadonlySet<RouterErrorCode> = ...

    Codes where the server gets the last word: the default onError handler hard-navigates — an unmatched URL renders server-side, and a failed lazy chunk (stale hashes after a deploy) recovers via a full page load.