chore: Add better lint output

tools/bazel_rules/stylelint/run-stylelint.ts

@@ -16,7 +16,7 @@
 import { lint, LinterResult } from 'stylelint';
 import { junitFormatter, createXML } from './junit-formatter';
 import { writeFileSync } from 'fs';
-import { resolve } from 'path';
+import { resolve, relative } from 'path';
 import { options } from 'yargs';
 
 const { XML_OUTPUT_FILE } = process.env;
@@ -51,8 +51,20 @@ async function main(): Promise<void> {
 
   writeFileSync(XML_OUTPUT_FILE as string, lintingOutcome.output);
 
+  const lintResult = lintingOutcome.results.map((suite) => {
+    const file = relative(process.cwd(), suite.source);
+    const warnings = suite.warnings.map((c) => `L${c.line}: ${c.text}`);
+    const icon = suite.errored ? '\u2705' : '\u274C';
+
+    return `
+${icon} ${file} ${warnings.length ? '\n\n' + warnings.join('\n') : ''}`;
+  });
+
   if (lintingOutcome.errored) {
-    throw new Error('Lint errors found in the listed files.');
+    throw new Error(`Lint errors found in the listed files:
+
+${lintResult}
+`);
   }
 }