Sourced from mongoose's releases.

8.18.0 / 2025-08-22

• feat(schema): support for union types #15574 #10894
• fix: trim long strings in minLength and maxLength error messages and display the string length #15571 #15550
• types(connection+collection): make BaseCollection and BaseConnection usable as values #15575 #15548
• types: remove logic that omits timestamps when virtuals, methods, etc. options set #15577 #12807

8.17.2 / 2025-08-18

• fix: avoid Model.validate() hanging when all paths fail casting #15580 #15579 piotracalski
• types(document): better support for flattenObjectIds and versionKey options for toObject() and toJSON() #15582 #15578
• docs: fix docs jsdoc tags and add UUID to be listed #15585
• docs(document): fix code sample that errors with "Cannot set properties of undefined" #15589

Sourced from mongoose's changelog.

8.18.0 / 2025-08-22

• feat(schema): support for union types #15574 #10894
• fix: trim long strings in minLength and maxLength error messages and display the string length #15571 #15550
• types(connection+collection): make BaseCollection and BaseConnection usable as values #15575 #15548
• types: remove logic that omits timestamps when virtuals, methods, etc. options set #15577 #12807

8.17.2 / 2025-08-18

• fix: avoid Model.validate() hanging when all paths fail casting #15580 #15579 piotracalski
• types(document): better support for flattenObjectIds and versionKey options for toObject() and toJSON() #15582 #15578
• docs: fix docs jsdoc tags and add UUID to be listed #15585
• docs(document): fix code sample that errors with "Cannot set properties of undefined" #15589

• 65e9dcc chore: release 8.18.0
• 8f24953 Merge pull request #15595 from Automattic/8.18
• 8f80bc7 Merge pull request #15574 from Automattic/vkarpov15/gh-10894
• 56ac298 fix lint from copilot suggestion
• 43a72ca Update lib/schema/union.js
• fc197a4 feat(types): add support for union types
• aef5be6 Merge branch 'vkarpov15/gh-10894' of github.com:Automattic/mongoose into vkar...
• ec77420 fix lint
• 1e3bc99 Update lib/options/schemaUnionOptions.js
• 6f2ac19 Merge branch '8.18' into vkarpov15/gh-10894
• Additional commits viewable in compare view

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