fix(preset-env): Consider browserslist config if env.target not configured

crates/preset_env_base/src/query.rs

@@ -1,7 +1,7 @@
 //! Module for `browserslist` queries.
 #![deny(clippy::all)]
 
-use std::collections::HashMap;
+use std::{collections::HashMap, path::PathBuf};
 
 use anyhow::{Context, Error};
 use dashmap::DashMap;
@@ -96,8 +96,31 @@ impl Query {
     }
 }
 
-pub fn targets_to_versions(v: Option<Targets>) -> Result<Versions, Error> {
+pub fn targets_to_versions(v: Option<Targets>, path: Option<PathBuf>) -> Result<Versions, Error> {
     match v {
+        #[cfg(not(target_arch = "wasm32"))]
+        None => {
+            let mut browserslist_opts = browserslist::Opts::new()
+                .mobile_to_desktop(true)
+                .ignore_unknown_versions(true)
+                .to_owned();
+            if let Some(path) = path {
+                browserslist_opts.path(
+                    path.clone()
+                        .into_os_string()
+                        .to_str()
+                        .unwrap_or_else(|| panic!("Invalid path \"{:?}\"", path)),
+                );
+            }
+            let distribs = browserslist::execute(&browserslist_opts)
+                .with_context(|| "failed to resolve browserslist query from browserslist config")?;
+
+            let versions =
+                BrowserData::parse_versions(distribs).expect("failed to parse browser version");
+
+            Ok(versions)
+        }
+        #[cfg(target_arch = "wasm32")]
         None => Ok(Default::default()),
         Some(Targets::Versions(v)) => Ok(v),
         Some(Targets::Query(q)) => q

crates/swc_css_prefixer/src/prefixer.rs

@@ -107,7 +107,7 @@ pub fn should_prefix(property: &str, target: Versions, default: bool) -> bool {
 }
 
 pub fn prefixer(options: Options) -> impl VisitMut {
-    let env: Versions = targets_to_versions(options.env).expect("failed to parse targets");
+    let env: Versions = targets_to_versions(options.env, None).expect("failed to parse targets");
 
     Prefixer {
         env,

crates/swc_ecma_preset_env/src/lib.rs

@@ -46,7 +46,8 @@ where
     C: Comments + Clone,
 {
     let loose = c.loose;
-    let targets: Versions = targets_to_versions(c.targets).expect("failed to parse targets");
+    let targets: Versions =
+        targets_to_versions(c.targets, c.path).expect("failed to parse targets");
     let is_any_target = targets.is_any_target();
 
     let (include, included_modules) = FeatureOrModule::split(c.include);
@@ -602,8 +603,8 @@ pub struct Config {
     #[serde(default)]
     pub targets: Option<Targets>,
 
-    #[serde(default = "default_path")]
-    pub path: PathBuf,
+    #[serde(default)]
+    pub path: Option<PathBuf>,
 
     #[serde(default)]
     pub shipped_proposals: bool,
@@ -615,14 +616,6 @@ pub struct Config {
     pub bugfixes: bool,
 }
 
-fn default_path() -> PathBuf {
-    if cfg!(target_arch = "wasm32") {
-        Default::default()
-    } else {
-        std::env::current_dir().unwrap()
-    }
-}
-
 #[derive(Debug, Clone, Deserialize, FromVariant)]
 #[serde(untagged)]
 pub enum FeatureOrModule {

crates/swc_ecma_preset_env/tests/test.rs

@@ -147,7 +147,7 @@ fn exec(c: PresetConfig, dir: PathBuf) -> Result<(), Error> {
                         force_all_transforms: c.force_all_transforms,
                         shipped_proposals: c.shipped_proposals,
                         targets: c.targets,
-                        path: std::env::current_dir().unwrap(),
+                        path: std::env::current_dir().ok(),
                     },
                     Default::default(),
                     &mut Default::default(),