Add typescript linter

Change-Id: Ife1027586de8c42873e1b85799b03063c2476a68

package.json

@@ -13,6 +13,7 @@
     "eslint-plugin-jsdoc": "^19.2.0",
     "eslint-plugin-prettier": "^3.1.3",
     "fried-twinkie": "^0.2.2",
+    "gts": "^2.0.2",
     "polymer-cli": "^1.9.11",
     "prettier": "2.0.5",
     "typescript": "3.8.2"

polygerrit-ui/app/.eslintignore

@@ -1,2 +1,3 @@
 **/node_modules
 **/rollup.config.js
+node_modules_licenses

polygerrit-ui/app/.eslintrc.js

@@ -150,7 +150,6 @@ module.exports = {
       }
     }],
     "import/named": 2,
-    "import/no-unresolved": 2,
     "import/no-self-import": 2,
     // The no-cycle rule is slow, because it doesn't cache dependencies.
     // Disable it.
@@ -174,6 +173,26 @@ module.exports = {
     "security": "readonly",
   },
   "overrides": [
+    {
+      // .js-only rules
+      "files": ["**/*.js"],
+      "rules": {
+        // The rule is required for .js files only, because typescript compiler
+        // always checks import.
+        "import/no-unresolved": 2,
+      }
+    },
+    {
+      "files": ["**/*.ts"],
+      "extends": [require.resolve("gts/.eslintrc.json")],
+      "rules": {
+        // The following rules is required to match internal google rules
+        "@typescript-eslint/restrict-plus-operands": "error"
+      },
+      "parserOptions": {
+        "project": path.resolve(__dirname, "./tsconfig.json"),
+      }
+    },
     {
       "files": ["*.html", "test.js", "test-infra.js", "template_test.js"],
       "rules": {

polygerrit-ui/app/.prettierrc.js

@@ -0,0 +1,27 @@
+/**
+ * @license
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+module.exports = {
+  "overrides": [
+    {
+      "files": ["**/*.ts"],
+      "options": {
+          ...require('gts/.prettierrc.json')
+      }
+    }
+  ]
+};

polygerrit-ui/app/BUILD

@@ -112,11 +112,14 @@ eslint(
     data = [
         # The .eslintrc-bazel.js extends the .eslintrc.js config, pass it as a dependency
         ".eslintrc.js",
+        ".prettierrc.js",
         ".eslint-ts-resolver.js",
+        "tsconfig.json",
     ],
     extensions = [
         ".html",
         ".js",
+        ".ts",
     ],
     ignore = ".eslintignore",
     plugins = [
@@ -125,6 +128,7 @@ eslint(
         "@npm//eslint-plugin-import",
         "@npm//eslint-plugin-jsdoc",
         "@npm//eslint-plugin-prettier",
+        "@npm//gts",
     ],
 )
 

polygerrit-ui/app/behaviors/base-url-behavior/base-url-behavior.ts

@@ -29,4 +29,3 @@ export const BaseUrlBehavior = {
 // temporary assign global variables.
 window.Gerrit = window.Gerrit || {};
 window.Gerrit.BaseUrlBehavior = BaseUrlBehavior;
-