fix(emitter-framework): emit `extends Record<string, T>` for compatible types, `additionalProperties` for incompatible types#9897

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Copilot wants to merge 8 commits intomainfrom

copilot/fix-emit-additional-properties

Commits on Mar 4, 2026

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fix(emitter-framework): use Record<string, T> extends instead of additionalProperties for record models

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markcowl
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fix(http-client-js): update test snapshots for Record extends pattern

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markcowl
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Merge branch 'main' of https://github.com/microsoft/typespec into copilot/fix-emit-additional-properties
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chore: merge latest main and fix formatting

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markcowl
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fix(http-client-js): fix e2e tests - spread additional properties directly instead of wrapping in additionalProperties

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markcowl
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test(emitter-framework): add test case for incompatible property types skipping extends Record

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markcowl
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fix(emitter-framework): add additionalProperties for incompatible record types, use extends Record for compatible types

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markcowl
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