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feat: Check the preconditions on a subject recursively, for the subject together with every subject below it. - #433
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goloroden merged 4 commits intoOct 23, 2026
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… API, and refuse a recursive one before sending it to a server without it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01CiuYmw4N6SSzfFyrwftUEj
…nd refuse any but a non-recursive one on a server without the v2 API. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01CiuYmw4N6SSzfFyrwftUEj
…sing a write with a recursive precondition, so that a server upgraded meanwhile gets it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01CiuYmw4N6SSzfFyrwftUEj
…again before a recursive write, and keep it if finding out fails. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01CiuYmw4N6SSzfFyrwftUEj
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October 23, 2026 08:24
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The preconditions on a subject can now apply to the subject together with every subject below it, through
PreconditionOptionswithrecursive, as the v2 API of EventSourcingDB offers it (thenativeweb/eventsourcingdb#1277). Existing calls send the same requests as before.Against a server without the v2 API, a write with a recursive precondition fails with an
IncompatibleServererror before the write is sent, rather than being checked on the subject alone. Before it fails, the client asks the server once more which API it offers, if it had remembered v1, so that a server upgraded while the application runs is used through v2 at once; every other request keeps using the remembered answer meanwhile.The options are an optional last parameter, so every existing call keeps working; a point-free call such as
subjects.map(isSubjectPristine)no longer compiles in TypeScript, sincemappasses the index as the second argument. On v1, only options withrecursiveset tofalseare stripped; anything else is refused, so that a caller without types never gets a check on the subject alone without notice.The tests against the
previewimage pass once it contains thenativeweb/eventsourcingdb#2398.Closes #432
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