fix(es/codegen): Implement codegen for static import assertions

crates/swc_ecma_codegen/src/lib.rs

@@ -275,6 +275,14 @@ where
         }
 
         emit!(n.src);
+
+        if let Some(asserts) = &n.asserts {
+            formatting_space!();
+            keyword!("assert");
+            formatting_space!();
+            emit!(asserts);
+        }
+
         formatting_semi!();
     }
 
@@ -402,6 +410,13 @@ where
             keyword!("from");
             formatting_space!();
             emit!(src);
+
+            if let Some(asserts) = &node.asserts {
+                formatting_space!();
+                keyword!("assert");
+                formatting_space!();
+                emit!(asserts);
+            }
         }
         formatting_semi!();
     }
@@ -417,6 +432,14 @@ where
         keyword!("from");
         formatting_space!();
         emit!(node.src);
+
+        if let Some(asserts) = &node.asserts {
+            formatting_space!();
+            keyword!("assert");
+            formatting_space!();
+            emit!(asserts);
+        }
+
         formatting_semi!();
     }
 

crates/swc_ecma_codegen/tests/fixture/issues/3110/input.js

@@ -0,0 +1,5 @@
+import data from "./data.json" assert { type: "json" };
+export { default as data2 } from "./data2.json" assert { type: "json" };
+export * as data3 from "./data3.json" assert { type: "json" };
+
+console.log(data);

crates/swc_ecma_codegen/tests/fixture/issues/3110/output.js

@@ -0,0 +1,10 @@
+import data from "./data.json" assert {
+    type: "json"
+};
+export { default as data2 } from "./data2.json" assert {
+    type: "json"
+};
+export * as data3 from "./data3.json" assert {
+    type: "json"
+};
+console.log(data);

crates/swc_ecma_codegen/tests/fixture/issues/3110/output.min.js

@@ -0,0 +1 @@
+import data from"./data.json"assert{type:"json"};export{default as data2}from"./data2.json"assert{type:"json"};export*as data3 from"./data3.json"assert{type:"json"};console.log(data)

crates/swc_ecma_parser/src/error.rs

@@ -171,6 +171,8 @@ pub enum SyntaxError {
 
     NumericSeparatorIsAllowedOnlyBetweenTwoDigits,
 
+    ImportAssertions,
+
     TS1003,
     TS1005,
     TS1009,
@@ -430,6 +432,10 @@ impl SyntaxError {
                     .into()
             }
 
+            SyntaxError::ImportAssertions => "import assertions require target to es2022 or \
+                                              higher and importAssertions:true for ecmascript"
+                .into(),
+
             SyntaxError::TS1056 => {
                 "jsc.target should be es5 or upper to use getter / setter".into()
             }

crates/swc_ecma_parser/src/parser/stmt/module_item.rs

@@ -153,8 +153,16 @@ impl<'a, I: Tokens> Parser<I> {
         let _ = cur!(self, false);
         let asserts = if self.input.syntax().import_assertions()
             && !self.input.had_line_break_before_cur()
-            && eat!(self, "assert")
+            && is!(self, "assert")
         {
+            let valid = self.target() >= EsVersion::Es2022;
+
+            if !valid {
+                self.emit_err(self.input.cur_span(), SyntaxError::ImportAssertions);
+            }
+
+            eat!(self, "assert");
+
             match *self.parse_object::<Box<Expr>>()? {
                 Expr::Object(v) => Some(v),
                 _ => unreachable!(),
@@ -755,8 +763,16 @@ impl<'a, I: Tokens> Parser<I> {
         let _ = cur!(self, false);
         let asserts = if self.input.syntax().import_assertions()
             && !self.input.had_line_break_before_cur()
-            && eat!(self, "assert")
+            && is!(self, "assert")
         {
+            let valid = self.target() >= EsVersion::Es2022;
+
+            if !valid {
+                self.emit_err(self.input.cur_span(), SyntaxError::ImportAssertions);
+            }
+
+            eat!(self, "assert");
+
             match *self.parse_object::<Box<Expr>>()? {
                 Expr::Object(v) => Some(v),
                 _ => unreachable!(),