Custom linter to check code quality (#2753)

ts/util/lint/sort_exceptions.ts

@@ -0,0 +1,14 @@
+// tslint:disable no-console
+
+import { join } from 'path';
+import { writeFileSync } from 'fs';
+
+import { ExceptionType } from './types';
+import { loadJSON, sortExceptions } from './util';
+
+const exceptionsPath = join(__dirname, 'exceptions.json');
+const exceptions: Array<ExceptionType> = loadJSON(exceptionsPath);
+
+const sorted = sortExceptions(exceptions);
+
+writeFileSync(exceptionsPath, JSON.stringify(sorted, null, '  '));