Backmerge/release/february 2026 2026 02 26#3983
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…Code (#3929) - [x] Change `InitializedByFlags.Default` back from `-1` to `0` (no user-specific initialization setting for sub clients) - [x] Rename `InitializedByFlags.None` to `InitializedByFlags.CustomizeCode` (value `4` / `1 << 2` for bitmap compatibility) - [x] Update documentation for `Default` to clarify it only works for sub clients - [x] Add documentation for `Individually` (1) and `Parent` (2) values - [x] Move `customizeCode` to end of `InitializedBy` enum in `decorators.tsp` - [x] Update `InitializedBy.none` to `InitializedBy.customizeCode` with value `4` in `decorators.tsp` - [x] Update decorator validation to accept `4` as valid value - [x] Validate that `customizeCode` cannot be combined with other values in a union - [x] Update all references in source code, tests, CHANGELOG, and changeset - [x] Regenerate reference docs via `pnpm run regen-docs` - [x] Build and test (all 1177 tests pass) - [x] Format code with `pnpm -w format` - [x] Code review and security checks passed <!-- START COPILOT ORIGINAL PROMPT --> <details> <summary>Original prompt</summary> > > ---- > > *This section details on the original issue you should resolve* > > <issue_title>[Bug]: InitializedByFlags.Default changed to -1 introduced significant codegen changes</issue_title> > <issue_description>### Describe the bug > > #3877 changed `InitializedByFlags.Default` to `-1` which means all the bits are set. As a result, when emitters don't explicitly test for this value, clients are treated as having the `Parent` and `Individually` bits set, so we emit client constructors in addition to client accessors. Before this change, no client constructors were being emitted. > > To further confuse the issue, the docs for the `Default` flag state it's `internal only` which makes me think that tcgc should not be exposing this to callers. > > ### Reproduction > > tcgc `v0.65.0` rebuild any Spector test that has hierarchical clients. > > ### Checklist > > - [x] Follow our [Code of Conduct](https://github.com/azure/typespec-azure/blob/main/CODE_OF_CONDUCT.md) > - [x] Check that this issue is about the Azure libraries for typespec. For bug in the typespec language or core libraries file it in the [TypeSpec repo](https://github.com/Microsoft/TypeSpec/issues/new/choose) > - [x] Check that there isn't already an issue that request the same bug to avoid creating a duplicate. > - [x] The provided reproduction is a [minimal reproducible example](https://stackoverflow.com/help/minimal-reproducible-example) of the bug.</issue_description> > > <agent_instructions>Change back default value to 0 and not doc it to be internal only. The default is used by some languages that tells that there is no user specific initialization setting. Rename `None` to `CustomizeCode` that means the initialization needs to be handled manually. Make sure doc could represent the usage and use `pnpm -w format` and `pnpm -w change add` to format code and add changeset.</agent_instructions> > > ## Comments on the Issue (you are @copilot in this section) > > <comments> > </comments> > </details> <!-- START COPILOT CODING AGENT SUFFIX --> - Fixes #3927 <!-- START COPILOT CODING AGENT TIPS --> --- 💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more [Copilot coding agent tips](https://gh.io/copilot-coding-agent-tips) in the docs. --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: tadelesh <1726438+tadelesh@users.noreply.github.com>
Co-authored-by: tadelesh <chenjieshi@microsoft.com>
…emplates (#3945) Cherry pick of #3941 onto release branch in preparation for hotfix Co-authored-by: Copilot <198982749+Copilot@users.noreply.github.com> Co-authored-by: JoshLove-msft <54595583+JoshLove-msft@users.noreply.github.com> Co-authored-by: joheredi <21109913+joheredi@users.noreply.github.com> Co-authored-by: Jose Manuel Heredia Hidalgo <joheredi@microsoft.com>
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Feb 27, 2026
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