Function optionalField

packages/opentelemetry/src/internal/protobuf.ts:208–211

(
  value: T | undefined,
  encode: (v: T) => Uint8Array
)

 * Helper to conditionally encode an optional field
 */
export const optionalField = <T>(
  value: T | undefined,
  encode: (v: T) => Uint8Array
): Uint8Array => value !== undefined ? encode(value) : new Uint8Array(0)

/**
 * Helper to conditionally encode a string field if non-empty