fix(es/compat): Use correct span.lo in class transforms (#8439)

**Related issue:**

 - Closes #8435

Author: Austaras

crates/swc/Cargo.toml

@@ -24,7 +24,7 @@ concurrent = [
   "swc_ecma_minifier/concurrent",
 ]
 
-debug = ["swc_ecma_visit/debug"]
+debug = ["swc_ecma_visit/debug", "swc_ecma_minifier/debug"]
 default = ["es3"]
 es3 = []
 node = ["napi", "napi-derive", "swc_compiler_base/node"]

crates/swc/tests/fixture/issues-5xxx/5272/1/output/a.map

@@ -1,5 +1,5 @@
 {
-  "mappings": ";;;+BACaA;;;eAAAA;;;;;;;oBADQ;AACd,IAAA,AAAMA,oBAAN;;gBAAMA;iCAAAA;aAAAA;kCAAAA;;;oBAAAA;;YACTC,KAAAA;mBAAAA,SAAAA;gBACI,OAAO,IAAI,IAAI,CAACC,GAAG;YACvB;;;WAHSF;EAAYG,UAAI",
+  "mappings": ";;;+BACaA;;;eAAAA;;;;;;;oBADQ;AACd,IAAA,AAAMA,oBAAD,AAAL;;gBAAMA;iCAAAA;aAAAA;kCAAAA;;;oBAAAA;;YACTC,KAAAA;mBAAAA,SAAAA;gBACI,OAAO,IAAI,IAAI,CAACC,GAAG;YACvB;;;WAHSF;EAAYG,UAAI",
   "names": [
     "Foo",
     "bar",

crates/swc/tests/fixture/issues-8xxx/8435/input/.swcrc

@@ -0,0 +1,20 @@
+{
+  "jsc": {
+    "parser": {
+      "syntax": "typescript",
+      "dynamicImport": true,
+      "tsx": true,
+      "jsx": true
+    },
+    "minify": {
+      "compress": true,
+      "mangle": false
+    },
+    "loose": false
+  },
+  "env": {
+    "targets": "> 0.25%, not dead, Safari >=8",
+    "mode": "entry",
+    "coreJs": "3.27"
+  }
+}

crates/swc/tests/fixture/issues-8xxx/8435/input/index.js

@@ -0,0 +1,12 @@
+const init = () => {
+  var e = window.parcelRequire;
+  e.register('module1', function () {
+    class Hello {
+      world() {}
+    }
+}), e.register('module2', function () {
+      console.log('test')
+    });
+};
+
+init();

crates/swc/tests/fixture/issues-8xxx/8435/output/index.js

@@ -0,0 +1,6 @@
+var e;
+import { _ as _class_call_check } from "@swc/helpers/_/_class_call_check";
+import { _ as _create_class } from "@swc/helpers/_/_create_class";
+(e = window.parcelRequire).register("module1", function() {}), e.register("module2", function() {
+    console.log("test");
+});

crates/swc_ecma_compat_es2015/src/classes/mod.rs

@@ -381,7 +381,7 @@ where
         if let Expr::Call(call) = &mut rhs {
             let mut span = Span {
                 // after class
-                lo: span.hi + BytePos(5),
+                lo: span.lo + BytePos(5),
                 ..span
             };
             self.add_pure_comments(&mut span.lo);