feat: add Nix syntax highlighting (#3110)

* feat: add Nix syntax highlighting

* fix: update Nix dependency hash

* fix: update Nix dependency hash

---------

Co-authored-by: Mohamed Boudra <boudra.moha@gmail.com>

packages/highlight/src/__tests__/highlighter.test.ts

@@ -75,6 +75,17 @@ describe("highlightCode", () => {
     expect(stringToken?.style).toBe("string");
   });
 
+  it("highlights Nix code", () => {
+    const code = 'let message = "hello"; in message';
+    const result = highlightCode(code, "default.nix");
+
+    const letToken = result[0].find((token) => token.text === "let");
+    expect(letToken?.style).toBe("keyword");
+
+    const stringToken = result[0].find((token) => token.text.includes("hello"));
+    expect(stringToken?.style).toBe("string");
+  });
+
   it("highlights TSX code with correct dialect", () => {
     const code = 'const el = <div className="test">hello</div>;';
     const result = highlightCode(code, "test.tsx");

packages/highlight/src/__tests__/parsers.test.ts

@@ -21,6 +21,7 @@ describe("isLanguageSupported", () => {
     expect(isLanguageSupported("test.swift")).toBe(true);
     expect(isLanguageSupported("test.dart")).toBe(true);
     expect(isLanguageSupported("test.cs")).toBe(true);
+    expect(isLanguageSupported("test.nix")).toBe(true);
     expect(isLanguageSupported("test.ex")).toBe(true);
   });
 
@@ -60,6 +61,7 @@ describe("getSupportedExtensions", () => {
     expect(extensions).toContain("swift");
     expect(extensions).toContain("dart");
     expect(extensions).toContain("cs");
+    expect(extensions).toContain("nix");
     expect(extensions).toContain("json");
   });
 });