swc/crates/swc_atoms/build.rs

use std::{env, path::Path};

fn main() {
    let strs = include_str!("words.txt")
        .lines()
        .map(|l| l.trim())
        .collect::<Vec<_>>();
    gen("js_word", "JsWord", &strs);
}

fn gen(mac_name: &str, type_name: &str, atoms: &[&str]) {
    string_cache_codegen::AtomType::new(type_name, &format!("{}!", mac_name))
        .atoms(atoms)
        .with_atom_doc(
            "
[JsWord] is an interned string.

This type should be used instead of [String] for values, because lots of
values are duplicated. For example, if an identifier is named `myVariable`,
there will be lots of identifier usages with the value `myVariable`.

This type
  - makes equality comparison faster.
  - reduces memory usage.
            ",
        )
        .write_to_file(&Path::new(&env::var("OUT_DIR").unwrap()).join(format!("{}.rs", mac_name)))
        .unwrap();
}