Typescript for frontend code.

client/.eslintrc.json

@@ -5,19 +5,36 @@
         "es6": true
     },
     "extends": [
-        "standard"
+      "standard-with-typescript"
     ],
     "globals": {},
-    "plugins": [],
+    "parser": "@typescript-eslint/parser",
+    "parserOptions": {
+        "ecmaVersion": 2018,
+        "project": [
+            "./client/tsconfig.json"
+        ]
+    },
+    "plugins": [
+        "@typescript-eslint"
+    ],
     "ignorePatterns": [],
     "rules": {
-        "max-len": [
-          "error",
-          {
-            "code": 120,
-            "comments": 120
-          }
-        ],
-        "no-unused-vars": [2, {"argsIgnorePattern": "^_"}]
-    }
+      "@typescript-eslint/no-unused-vars": [2, {"argsIgnorePattern": "^_"}],
+      "@typescript-eslint/no-floating-promises": "error",
+      "@typescript-eslint/no-misused-promises": "error",
+      "@typescript-eslint/no-var-requires": "off",
+      "@typescript-eslint/strict-boolean-expressions": "off",
+      "@typescript-eslint/return-await": [2, "in-try-catch"], // FIXME: correct?
+      "@typescript-eslint/no-invalid-void-type": "off",
+      "@typescript-eslint/triple-slash-reference": "off",
+      "max-len": [
+        "error",
+        {
+          "code": 120,
+          "comments": 120
+        }
+      ],
+      "no-unused-vars": "off"
+  }
 }