If you want to read the docs for a Rust project that isn't on crates.io (such as the main branch on github) you can clone the repo, then run
cargo doc. For example, with SWC (which is a workspace), we can run
git clone https://github.com/swc-project/swc
cargo doc --workspace
In some cases you'll run into an experimental feature in a dependency's docs, such as this one from serde, a dependency of swc (which uses nightly rust).
❯ cargo doc --workspace
Documenting serde v1.0.125
Documenting swc_visit v0.2.4 (/Users/chris/tmp/swc/visit)
error[E0658]: linking to associated items of raw pointers is experimental
= note: see issue
= help: add `` to the crate attributes to enable
= note: rustdoc does not allow disambiguating between `*const` and `*mut`, and pointers are unstable until it does
error: aborting due to previous error
For more information about this error, try `rustc --explain E0658`.
error: could not document `serde`
To work around this, since we don't really need serde's documentation to be generated, we can use
--no-deps. We can also use
--open to open the generated documentation.
cargo doc --workspace --no-deps --open