feat(es/module/cjs): Support import.meta.url (#4087)

crates/swc_ecma_transforms_module/src/common_js.rs

@@ -915,7 +915,57 @@ impl Fold for CommonJs {
         stmts
     }
 
-    fn fold_expr(&mut self, expr: Expr) -> Expr {
+    fn fold_expr(&mut self, mut expr: Expr) -> Expr {
+        if !self.config.preserve_import_meta {
+            // https://github.com/swc-project/swc/issues/1202
+            if let Expr::Member(MemberExpr {
+                obj,
+                prop: MemberProp::Ident(prop),
+                ..
+            }) = &mut expr
+            {
+                if &*prop.sym == "url" {
+                    if let Expr::MetaProp(MetaPropExpr {
+                        span,
+                        kind: MetaPropKind::ImportMeta,
+                        ..
+                    }) = &**obj
+                    {
+                        // require('url').pathToFileURL(__filename).toString()
+
+                        let url_module = CallExpr {
+                            span: DUMMY_SP,
+                            callee: quote_ident!("require").as_callee(),
+                            args: vec!["url".as_arg()],
+                            type_args: Default::default(),
+                        };
+
+                        let url_obj = CallExpr {
+                            span: DUMMY_SP,
+                            callee: url_module
+                                .make_member(quote_ident!("pathToFileURL"))
+                                .as_callee(),
+                            args: vec![Ident::new(
+                                "__filename".into(),
+                                DUMMY_SP.with_ctxt(
+                                    SyntaxContext::empty().apply_mark(self.top_level_mark),
+                                ),
+                            )
+                            .as_arg()],
+                            type_args: Default::default(),
+                        };
+
+                        *obj = Box::new(Expr::Call(CallExpr {
+                            span: *span,
+                            callee: url_obj.make_member(quote_ident!("toString")).as_callee(),
+                            args: Default::default(),
+                            type_args: Default::default(),
+                        }));
+                    }
+                }
+            }
+        }
+
         let top_level = self.in_top_level;
         Scope::fold_expr(self, quote_ident!("exports"), top_level, expr)
     }

crates/swc_ecma_transforms_module/src/util.rs

@@ -49,6 +49,8 @@ pub struct Config {
     pub no_interop: bool,
     #[serde(default)]
     pub ignore_dynamic: bool,
+    #[serde(default)]
+    pub preserve_import_meta: bool,
 }
 
 impl Default for Config {
@@ -59,6 +61,7 @@ impl Default for Config {
             lazy: Lazy::default(),
             no_interop: false,
             ignore_dynamic: false,
+            preserve_import_meta: false,
         }
     }
 }

crates/swc_ecma_transforms_module/tests/common_js.rs

@@ -4923,7 +4923,7 @@ test!(
         strict: true,
         strict_mode: true,
         lazy: Lazy::Bool(false),
-        ignore_dynamic: false
+        ..Default::default()
     }),
     issue_1480_1,
     "
@@ -4944,7 +4944,7 @@ test!(
         strict: true,
         strict_mode: true,
         lazy: Lazy::Bool(false),
-        ignore_dynamic: false
+        ..Default::default()
     }),
     issue_1480_2,
     "

crates/swc_ecma_transforms_module/tests/fixture/commonjs/issue-1201/1/input.js

@@ -0,0 +1 @@
+console.log(import.meta.url);

crates/swc_ecma_transforms_module/tests/fixture/commonjs/issue-1201/1/output.js

@@ -0,0 +1,2 @@
+"use strict";
+console.log(require("url").pathToFileURL(__filename).toString().url);