Format .swcrc as a JSON file (#12320)

* Format `.swcrc` as JSON

* Test `.swcrc` JSON formatting

* Add changelog

* Update snapshots

* Address reviews

* Update `cspell.json`

* Address review

changelog_unreleased/cli/12320.md

@@ -0,0 +1,3 @@
+#### Infer parser for `.swcrc` (#12320 by @sosukesuzuki)
+
+A [`.swcrc`](https://swc.rs/docs/configuration/swcrc) is handled using `json` parser.

cspell.json

@@ -310,6 +310,7 @@
         "suchipi",
         "supertypes",
         "Supprimer",
+        "swcrc",
         "templating",
         "tempy",
         "testname",

src/language-js/index.js

@@ -102,7 +102,7 @@ const languages = [
       since: "1.5.0",
       parsers: ["json"],
       vscodeLanguageIds: ["jsonc"],
-      filenames: [...data.filenames, ".eslintrc"],
+      filenames: [...data.filenames, ".eslintrc", ".swcrc"],
     })
   ),
   createLanguage(require("linguist-languages/data/JSON5.json"), () => ({

tests/integration/__tests__/__snapshots__/support-info.js.snap

@@ -512,7 +512,8 @@ exports[`CLI --support-info (stdout) 1`] = `
         \\"language-configuration.json\\",
         \\"tsconfig.json\\",
         \\"tslint.json\\",
-        \\".eslintrc\\"
+        \\".eslintrc\\",
+        \\".swcrc\\"
       ],
       \\"group\\": \\"JSON\\",
       \\"linguistLanguageId\\": 423,

tests/integration/__tests__/with-parser-inference.js

@@ -45,4 +45,26 @@ describe("infers parser from filename", () => {
       prettier.format("let foo = ( x = 1 ) => x", { filepath: "x/y/Jakefile" })
     ).toBe("let foo = (x = 1) => x;\n");
   });
+
+  test("json from .swcrc", () => {
+    expect(
+      prettier.format(
+        `
+    {
+      "jsc": {
+    // Requires v1.2.50 or upper and requires target to be es2016 or upper.
+        "keepClassNames": false
+      }
+    }
+    `,
+        { filepath: "/path/to/.swcrc" }
+      )
+    ).toBe(`{
+  "jsc": {
+    // Requires v1.2.50 or upper and requires target to be es2016 or upper.
+    "keepClassNames": false
+  }
+}
+`);
+  });
 });