Add TypeSpec representation for the facets pattern#587
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Documents how the facets API design pattern is authored in TypeSpec using the @facet decorator from @microsoft/typespec-msgraph (issue microsoftgraph/typespec-msgraph#1061, Phase 6): - facets.md: new "Facets in TypeSpec" section with a driveItem example (audio/file/folder/image/video as @facet nullable @complex properties), the linter rules, and the compiled CSDL (a standard nullable complex property -- @facet is authoring/lint-only and emits no CSDL annotation). - GuidelinesGraph.md: add a "TypeSpec representation" column to the modeling-variants comparison table and a pointer to the new section.
adrian05-ms
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Jun 23, 2026
Merges marynjenga/graph-patterns (PR microsoft#588) into the facets branch and resolves the GuidelinesGraph.md conflict where both branches rewrote the modeling-variants comparison table. Reconciled the shared 'TypeSpec representation' column so all three rows are correct against @microsoft/typespec-msgraph v1.1.0 (verified by compiling canaries): - Type hierarchy -> `@abstract` + `extends` - Facets -> `@facet` on a nullable `@complex` property - Flat bag -> `@flatBag` + `@variant` The prior facets-branch cell ('plain entity properties (no dedicated decorator)') was incorrect -- @flatBag/@variant ship in v1.1.0 -- and Mary's 'Facets = —' cell was incomplete since @facet ships as well. The merged table captures both decorator sets.
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Summary
Adds the TypeSpec representation of the facets API design pattern, completing the documentation deliverable (Phase 6) of microsoftgraph/typespec-msgraph#1061. The @facet decorator has shipped in
@microsoft/typespec-msgraphv1.1.0; this PR documents how to author the pattern.Changes
graph/patterns/facets.md— new Facets in TypeSpec section that models the existingdriveItemCSDL example in TypeSpec (audio/file/folder/image/videoas@facetnullable@complexproperties), lists the linter rules, and shows the compiled CSDL.graph/GuidelinesGraph.md— adds a TypeSpec representation column to the modeling-variants comparison table and a pointer to the new section.Note on CSDL output
@facetis an authoring/lint-only marker: it emits no CSDL annotation, so a facet property compiles to a standard nullable complex-typed<Property>— identical to a hand-authored facet. This was verified by compiling the example with the TypeSpec compiler (v1.9.0) +@microsoft/typespec-msgraph.