Lib.rs

Read [package.metadata.<tool>] config from Cargo.toml for derive macros.

Proc macros run at compile time and can read CARGO_MANIFEST_DIR to find the project's Cargo.toml. This crate provides a generic reader that:

1. Reads [package.metadata.<tool>] from the compiling crate's Cargo.toml
2. Falls back to [workspace.metadata.<tool>] in the workspace root
3. Caches the result for the compilation session

use derive_project_config::read_metadata;

let table = read_metadata("flowjs-rs");
if let Some(val) = table.and_then(|t| t.get("opaque_newtypes")) {
    // use val
}