Vendor things

third-party/vendor/swc_atoms/build.rs

@@ -0,0 +1,29 @@
+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();
+}