Variable: SESSION_ERROR_SEVERITY

const SESSION_ERROR_SEVERITY: Readonly<Record<SessionErrorCode, SessionErrorSeverity>>;

Defined in: packages/media-session/src/validate.ts:674

The one place a SessionErrorCode is graded.

In TypeScript rather than on the bridge, deliberately: severity is a property of the code, not of the occurrence, so shipping it across the bridge would be a second copy that a Kotlin edit could silently desynchronise from a Swift one — the exact defect ARCHITECTURE §27 is named after. Native says what happened; this table says how much it cost, once, for both platforms.

Record<SessionErrorCode, …> and not Partial<…>: adding a member to the union without grading it is then a typecheck failure rather than a silent undefined.