fix(swc): Allow overriding specified parser config using .swcrc (#2547

)

swc:
 - Merge parser config by enabling each feature. (#2546)

Cargo.toml

@@ -21,7 +21,7 @@ include = ["Cargo.toml", "src/**/*.rs"]
 license = "Apache-2.0/MIT"
 name = "swc"
 repository = "https://github.com/swc-project/swc.git"
-version = "0.79.0"
+version = "0.79.1"
 
 [lib]
 name = "swc"

node-swc/__tests__/transform/api_test.js

@@ -1,4 +1,5 @@
 const swc = require("../../../");
+const path = require("path");
 
 it("should handle minify", () => {
     const src = '/* Comment */import foo, {bar} from "foo"';
@@ -173,4 +174,20 @@ it("should respect `error.filename = false`", async () => {
         expect(e).not.toContain("-->")
     }
 
+});
+
+it("should merge parser config", async () => {
+    const filename = path.resolve(
+        __dirname + "/../../tests/issue-2546/input.ts"
+    );
+
+    const { code } = await swc.transformFile(filename, {
+        jsc: {
+            parser: {
+                syntax: "typescript",
+            }
+        }
+    })
+
+    expect(code).not.toBeFalsy()
 });

node-swc/tests/issue-2546/.swcrc

@@ -0,0 +1,12 @@
+{
+    "jsc": {
+        "parser": {
+            "syntax": "typescript",
+            "decorators": true
+        },
+        "transform": {
+            "legacyDecorator": true,
+            "decoratorMetadata": true
+        }
+    }
+}

node-swc/tests/issue-2546/input.ts

@@ -0,0 +1,6 @@
+import { injectable } from 'inversify';
+
+
+@injectable()
+export default abstract class MyClass {
+}

src/config/mod.rs

@@ -1361,7 +1361,48 @@ impl Merge for bool {
 
 impl Merge for Syntax {
     fn merge(&mut self, from: &Self) {
-        *self = *from;
+        match (&mut *self, from) {
+            (Syntax::Es(a), Syntax::Es(b)) => {
+                a.merge(b);
+            }
+            (Syntax::Typescript(a), Syntax::Typescript(b)) => {
+                a.merge(b);
+            }
+            _ => {
+                *self = *from;
+            }
+        }
+    }
+}
+
+impl Merge for swc_ecma_parser::EsConfig {
+    fn merge(&mut self, from: &Self) {
+        self.jsx |= from.jsx;
+        self.class_private_props |= from.class_private_props;
+        self.class_private_methods |= from.class_private_methods;
+        self.class_props |= from.class_props;
+        self.fn_bind |= from.fn_bind;
+        self.decorators |= from.decorators;
+        self.decorators_before_export |= from.decorators_before_export;
+        self.export_default_from |= from.export_default_from;
+        self.export_namespace_from |= from.export_namespace_from;
+        self.dynamic_import |= from.dynamic_import;
+        self.nullish_coalescing |= from.nullish_coalescing;
+        self.optional_chaining |= from.optional_chaining;
+        self.import_meta |= from.import_meta;
+        self.top_level_await |= from.top_level_await;
+        self.import_assertions |= from.import_assertions;
+        self.static_blocks |= from.static_blocks;
+        self.private_in_object |= from.private_in_object;
+    }
+}
+
+impl Merge for swc_ecma_parser::TsConfig {
+    fn merge(&mut self, from: &Self) {
+        self.tsx |= from.tsx;
+        self.decorators |= from.decorators;
+        self.dynamic_import |= from.dynamic_import;
+        self.import_assertions |= from.import_assertions;
     }
 }