From 0f45810e9f62adf6532d92f92fdc6cab8469b9e1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Donny/=EA=B0=95=EB=8F=99=EC=9C=A4?= <kdy1997.dev@gmail.com>
Date: Mon, 12 Dec 2022 15:12:07 +0900
Subject: [PATCH] Features

---
 crates/swc_css_compat/src/compiler/mod.rs | 10 ++++++++--
 crates/swc_css_compat/src/feature.rs      |  7 +++++++
 crates/swc_css_compat/src/lib.rs          |  2 +-
 crates/swc_css_compat/src/target.rs       |  1 -
 4 files changed, 16 insertions(+), 4 deletions(-)
 create mode 100644 crates/swc_css_compat/src/feature.rs
 delete mode 100644 crates/swc_css_compat/src/target.rs

diff --git a/crates/swc_css_compat/src/compiler/mod.rs b/crates/swc_css_compat/src/compiler/mod.rs
index 52b37f1337b2..9d44be51ce6e 100644
--- a/crates/swc_css_compat/src/compiler/mod.rs
+++ b/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 {
diff --git a/crates/swc_css_compat/src/feature.rs b/crates/swc_css_compat/src/feature.rs
new file mode 100644
index 000000000000..0d108a34f2b2
--- /dev/null
+++ b/crates/swc_css_compat/src/feature.rs
@@ -0,0 +1,7 @@
+use bitflags::bitflags;
+
+bitflags! {
+    pub struct Features: u64 {
+        const NESTING = 0b00000001;
+    }
+}
diff --git a/crates/swc_css_compat/src/lib.rs b/crates/swc_css_compat/src/lib.rs
index 2473a39a8ccf..d990d98d57af 100644
--- a/crates/swc_css_compat/src/lib.rs
+++ b/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;
diff --git a/crates/swc_css_compat/src/target.rs b/crates/swc_css_compat/src/target.rs
deleted file mode 100644
index c5c39935f55f..000000000000
--- a/crates/swc_css_compat/src/target.rs
+++ /dev/null
@@ -1 +0,0 @@
-pub struct SupportedFeatures {}