Features

crates/swc_css_compat/src/compiler/mod.rs

@@ -1,15 +1,21 @@
 use swc_css_visit::VisitMut;
 
+use crate::feature::Features;
+
 mod custom_media;
 
 /// Compiles a modern CSS file to a legacy CSS file.
 #[derive(Debug)]
 pub struct Compiler {
+    #[allow(unused)]
     c: Config,
 }
 
-#[derive(Debug, Default)]
-pub struct Config {}
+#[derive(Debug)]
+pub struct Config {
+    /// The list of features to **process**.
+    pub process: Features,
+}
 
 impl Compiler {
     pub fn new(config: Config) -> Self {

crates/swc_css_compat/src/feature.rs

@@ -0,0 +1,7 @@
+use bitflags::bitflags;
+
+bitflags! {
+    pub struct Features: u64 {
+        const NESTING = 0b00000001;
+    }
+}

crates/swc_css_compat/src/lib.rs

@@ -2,5 +2,5 @@
 #![allow(clippy::vec_box)]
 
 pub mod compiler;
+pub mod feature;
 pub mod nesting;
-pub mod target;