atproto_codegen

Alpha. Pre-1.0 and evolving alongside at-record; expect breaking changes between 0.x releases.

Generate Gleam types and JSON codecs from atproto lexicon files: records and objects with string/integer/number/boolean/array/ref/ cid-link/bytes/blob/unknown fields. Unsupported defs (e.g. union) are reported and skipped, never emitted wrong.

Usage

gleam run -m atproto_codegen -- <lexicons_dir> <out_dir> <out_module> <nsid_prefix>[,<nsid_prefix>...]
# e.g.
gleam run -m atproto_codegen -- ./lexicons ./src/my_app/gen my_app/gen com.example.myapp.,com.atproto.

• lexicons_dir is walked recursively for *.json lexicon files. Vendor any external lexicons you reference (e.g. com.atproto.repo.strongRef) into it.
• out_module is the module prefix the generated code imports itself under; it must match where out_dir sits in your src/.
• nsid_prefixes are stripped from NSIDs when deriving module paths, so com.example.myapp.shelf.entry emits <out_dir>/shelf/entry.gleam.

Generated blob fields use atproto/blob from the atproto_client package, so projects consuming generated code with blobs need that dependency.

Lexicon coverage

record and object defs. Refs resolve across lexicons (a bare NSID ref points at that lexicon's main def). knownValues string sets map to plain String; unknown round-trips through a Dynamic passthrough.