Custom linter to check code quality (#2753)

ts/util/lint/util.ts

@@ -0,0 +1,24 @@
+// tslint:disable no-console
+
+import { readFileSync } from 'fs';
+
+import { orderBy } from 'lodash';
+
+import { ExceptionType } from './types';
+
+export const ENCODING = 'utf8';
+
+export function loadJSON(target: string) {
+  try {
+    const contents = readFileSync(target, ENCODING);
+
+    return JSON.parse(contents);
+  } catch (error) {
+    console.log(`Error loading JSON from ${target}: ${error.stack}`);
+    throw error;
+  }
+}
+
+export function sortExceptions(exceptions: Array<ExceptionType>) {
+  return orderBy(exceptions, ['path', 'lineNumber', 'rule']);
+}