Tools for running builds using Nix in a monorepo.

Goal: Using one coherent build tool, I can develop multiple projects with common dependencies.

# Background



# Requirements

- select the toolchains and versions thereof for the project
- configure cross-compilation
- allow multiple languages
- co-exist with language ecosystems. For example, rust-analyzer needs cargo in order to understand Cargo.toml. However, it should be easier to fully build the project with Nix
- every module is compiled into a derivation that downstream modules can import. Each module derivation is cached separately so that Nix only rebuilds the changed module.
- Nix can generate a closure for an executable, even a cross-compiled one, to copy to the remote system

# Languages and Bindings

Languages:
- C
- Rust
- Typescript
- Javascript

Bindings:
- C -> Rust
- Rust -> Typescript
- Rust -> Javascript

Backends

|            | Linux x86 | Linux ARM | WASM | AVR | ESP32 |
| ---------- | --------- | --------- | ---- | --- | ----- |
| C          | yes       | yes       |      | yes |       |
| Rust       | yes       | yes       | yes  | yes | yes   |
| Typescript |           |           | yes  |     |       |
| Javascript |           |           | yes  |     |       |

- [[Mononix, C library]]
- [[Mononix, Rust library]]

# Build targets

- build
- run
- tests
- code coverage profiling
- linting
- performance testing

Each of these is a separate Nix command that builds or runs the desired result.

---
- [[Nix Monorepos]]
- [[Nix For Development]]
- [[Cross-compiling]]
- [[Scaling Rust Builds with Bazel]]
- [[Makefiles and Monorepos]]