フロー Furo

A protobuf-first framework that uses Protocol Buffers as the sole Interface Definition Language (IDL). Furo provides protoc plugins that generate TypeScript code and JSON Schema files from .proto definitions.

Repository Structure

Directory	Description
protoc-gen-open-models/	Protoc plugin generating TypeScript for @furo/open-models (Literal/Transport/Model types, enums, services)
protoc-gen-om-jsonschema/	Protoc plugin generating JSON Schema (Draft 2020-12) from proto messages
protoc-gen-debugfile/	Protoc plugin that captures the raw CodeGeneratorRequest for replay-based debugging
BEC/	Build Essentials Container — Docker image bundling protoc, Go, Node, and all furo tooling

Each plugin is a self-contained Go module with vendored dependencies.

Quick Start

Build a plugin and run it with protoc:

cd protoc-gen-open-models
go build -o protoc-gen-open-models .

protoc \
  -I./proto_dependencies \
  -I./proto \
  --open-models_out=./generated \
  your_proto_files.proto

Plugins

protoc-gen-open-models (v1.48.0)

Generates TypeScript from proto files for the @furo/open-models runtime. For each proto message, it produces a single .ts file containing:

• Literal interface (IPerson) — plain TypeScript interface, camelCase fields
• Transport interface (TPerson) — wire-format interface, snake_case fields
• Model class (Person) — runtime class extending FieldNode with getters, setters, and metadata

Also generates TypeScript enums and REST service classes from google.api.http annotations.

See protoc-gen-open-models/README.md for full documentation.

protoc-gen-om-jsonschema

Generates JSON Schema (Draft 2020-12) files from proto messages, optimized for AI consumption. One schema file per message/enum type.

Supports plugin options: strict_any, strict_map, strict_oneof, file_extension, ref_prefix, exclude_packages, exclude_messages.

cd protoc-gen-om-jsonschema
go build -o protoc-gen-om-jsonschema .

protoc \
  -I./proto_dependencies \
  -I./proto \
  --om-jsonschema_out=./schemas \
  --om-jsonschema_opt=file_extension=.json \
  your_proto_files.proto

See protoc-gen-om-jsonschema/README.md for full documentation.

protoc-gen-debugfile (v1.0.0)

Captures the raw CodeGeneratorRequest that protoc sends to plugins, enabling replay-based debugging in your IDE without needing protoc or the user's proto setup.

protoc \
  --debugfile_out=. \
  --debugfile_opt=/tmp/request.bin \
  --open-models_out=./generated \
  -I./proto_dependencies -I./proto \
  $(find proto -iname "*.proto")

# Later, replay without protoc:
./protoc-gen-open-models --replay-request=/tmp/request.bin

See protoc-gen-debugfile/README.md for full documentation.

License

MIT — Copyright (c) 2021 Eclipse Foundation