test(oxfmt): Add snapshot for invalid file error reports

apps/oxfmt/test/cli/error_reports/__snapshots__/error_reports.test.ts.snap

@@ -0,0 +1,38 @@
+// Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
+
+exports[`error_reports > should report errors for invalid files 1`] = `
+"--------------------
+arguments: --check invalid.js
+working directory: error_reports/fixtures
+exit code: 2
+--- STDOUT ---------
+Checking formatting...
+
+--- STDERR ---------
+
+  x Expected \`}\` but found \`EOF\`
+   ,-[invalid.js:2:1]
+ 1 | class {
+   :       |
+   :       \`-- Opened here
+   \`----
+Error occurred when checking code style in the above files.
+--------------------
+--------------------
+arguments: --check invalid.yaml
+working directory: error_reports/fixtures
+exit code: 2
+--- STDOUT ---------
+Checking formatting...
+
+--- STDERR ---------
+
+  x SyntaxError: Nested mappings are not allowed in compact mappings (1:6)
+  | [invalid.yaml]
+  | > 1 | key: val: nested
+  |     |      ^^^^^^^^^^^
+  | > 2 |
+  |     | ^
+Error occurred when checking code style in the above files.
+--------------------"
+`;

apps/oxfmt/test/cli/error_reports/error_reports.test.ts

@@ -0,0 +1,17 @@
+import { describe, expect, it } from "vitest";
+import { join } from "node:path";
+import { runAndSnapshot } from "../utils";
+
+const fixturesDir = join(import.meta.dirname, "fixtures");
+
+describe("error_reports", () => {
+  it("should report errors for invalid files", async () => {
+    const testCases = [
+      ["--check", "invalid.js"],
+      ["--check", "invalid.yaml"],
+    ];
+
+    const snapshot = await runAndSnapshot(fixturesDir, testCases);
+    expect(snapshot).toMatchSnapshot();
+  });
+});

apps/oxfmt/test/cli/error_reports/fixtures/invalid.js

@@ -0,0 +1 @@
+class {

apps/oxfmt/test/cli/error_reports/fixtures/invalid.yaml

@@ -0,0 +1 @@
+key: val: nested

apps/oxfmt/test/cli/utils.ts

@@ -81,23 +81,33 @@ ${afterContent}
 // ---
 
 function normalizeOutput(output: string, cwd: string): string {
-  let normalized = output;
-
-  // Normalize timing information
-  normalized = normalized.replace(/\d+(?:\.\d+)?s|\d+ms/g, "<variable>ms");
-  // Normalize thread count (e.g., "using 8 threads" -> "using 1 threads")
-  normalized = normalized.replace(/using \d+ threads/g, "using 1 threads");
-  // Normalize path separators (Windows compatibility)
-  normalized = normalized.replace(/\\/g, "/");
-  // Replace absolute paths
   const cwdPath = cwd.replace(/\\/g, "/");
-  normalized = normalized.replace(new RegExp(RegExp.escape(cwdPath), "g"), "<cwd>");
-  // Replace repo root path
   const repoRoot = join(import.meta.dirname, "..", "..", "..", "..");
   const rootPath = repoRoot.replace(/\\/g, "/");
-  normalized = normalized.replace(new RegExp(RegExp.escape(rootPath), "g"), "<cwd>");
 
-  return normalized;
+  return (
+    output
+      // Normalize timing information
+      .replace(/\d+(?:\.\d+)?s|\d+ms/g, "<variable>ms")
+      // Normalize path separators (Windows compatibility)
+      .replace(/\\/g, "/")
+      // Replace absolute paths
+      .replace(new RegExp(RegExp.escape(cwdPath), "g"), "<cwd>")
+      .replace(new RegExp(RegExp.escape(rootPath), "g"), "<cwd>")
+      // Strip ANSI escape codes (e.g. from Prettier error messages)
+      // eslint-disable-next-line no-control-regex
+      .replace(/\x1b\[[0-9;]*m/g, "")
+      // Normalize miette Unicode theme to ASCII
+      .replace(/×/g, "x")
+      .replace(/╭/g, ",")
+      .replace(/─/g, "-")
+      .replace(/│/g, "|")
+      .replace(/·/g, ":")
+      .replace(/┬/g, "|")
+      .replace(/╰/g, "`")
+      // Trim trailing whitespace per line
+      .replace(/[^\S\n]+$/gm, "")
+  );
 }
 
 function formatSnapshot(cwd: string, args: string[], { stdout, stderr, exitCode }: Result): string {