libero/codegen_decoders

Typed decoder generators.

Emits the rpc_decoders.gleam Gleam wrapper and the per-type rpc_decoders_ffi.mjs JavaScript module that the generated client stubs use to decode ETF responses into typed Gleam values.

Values

emit_typed_decoders

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pub fn emit_typed_decoders(
  discovered: List(walker.DiscoveredType),
) -> String

Emit a JS string with one decoder function per discovered type and an ensure_decoders entry point. Does not write to disk; exposed so tests can assert on the output without filesystem I/O.

write_decoders_ffi

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pub fn write_decoders_ffi(
  config config: config.Config,
  discovered discovered: List(walker.DiscoveredType),
  endpoints endpoints: List(scanner.HandlerEndpoint),
) -> Result(Nil, gen_error.GenError)

Write the typed decoders FFI file for the consumer. Per-endpoint response decoders are appended after the per-type decoders.

write_decoders_gleam

</>

pub fn write_decoders_gleam(
  config config: config.Config,
) -> Result(Nil, gen_error.GenError)

Write the Gleam wrapper for the typed decoder FFI. Surfaces ensure_decoders from the generated JS FFI file to Gleam callers, which triggers constructor and decoder registration on import. JS-only, no Erlang target fallback.