Function defineProjection

Marks a projection for Typegen and returns the projection string unchanged, with its literal type. useDocumentProjection matches that literal against the generated projection types.

Pass the document type first so Typegen evaluates the projection for that type only. A projection passed alone is evaluated for every document type in the schema, which generates a result type for each.

Marks a projection for Typegen and returns it unchanged. Typegen evaluates a projection passed alone for every document type in the schema; pass the document type first to limit it to one.