Native adapters for protobuf well-known types.

projections/1 returns ready-to-use entries for the :projections option of PB.compile/2 and PB.Schema. The adapters are opt-in — nothing is applied to a schema that does not register them.

PB.compile(descriptor_set,
  projections: PB.WellKnownTypes.projections([:time, :wrappers, :json])
)

Representations

Each group maps a set of well-known messages to a native Elixir value:

:time

• google.protobuf.Timestamp → {:timestamp, unix_nanoseconds}
• google.protobuf.Duration → {:duration, nanoseconds}

Integer nanoseconds keep protobuf precision intact. Higher-level integrations can expose lossy DateTime / Duration forms explicitly via a custom PB.Adapter.

:wrappers

The scalar wrapper messages unwrap to their bare scalar value (or nil when absent):

• google.protobuf.{Int32,Int64,UInt32,UInt64}Value → integer
• google.protobuf.{Float,Double}Value → float
• google.protobuf.BoolValue → boolean
• google.protobuf.StringValue → String.t()
• google.protobuf.BytesValue → binary

:json

The JSON-value messages map to JSON-shaped Elixir terms:

• google.protobuf.Value → nil | boolean | number | String.t() | list | map

• google.protobuf.ListValue → list
• google.protobuf.Struct → map with string keys

See Adapters and well-known types for how adapters compose with encode, decode, JSON, and validation.