Tweak ESLint rules.

js/.eslintrc

@@ -9,6 +9,8 @@
 
         // Possible Errors
         "comma-dangle": [2, "never"],
+        "handle-callback-err": 2,
+        "no-bitwise": 0,
         "no-cond-assign": 2,
         "no-console": 2,
         "no-constant-condition": 2,
@@ -26,7 +28,7 @@
         "no-func-assign": 2,
         "no-inner-declarations": 2,
         "no-invalid-regexp": 2,
-        "no-irregular-whitespace": 0,
+        "no-irregular-whitespace": 2,
         "no-negated-in-lhs": 2,
         "no-obj-calls": 2,
         "no-regex-spaces": 2,
@@ -66,7 +68,7 @@
         "no-lone-blocks": 2,
         "no-loop-func": 2,
         "no-multi-spaces": 0,
-        "no-multi-str": 0,
+        "no-multi-str": 2,
         "no-native-reassign": 2,
         "no-new": 2,
         "no-new-func": 0,
@@ -84,6 +86,7 @@
         "no-throw-literal": 2,
         "no-unused-expressions": 2,
         "no-useless-call": 2,
+        "no-useless-concat": 2,
         "no-void": 2,
         "no-warning-comments": 0,
         "no-with": 2,
@@ -117,7 +120,7 @@
         "eol-last": 2,
         "func-names": 0,
         "func-style": 0,
-        "indent": 0,
+        "indent": [2, 2, {"SwitchCase": 1}],
         "key-spacing": 0,
         "linebreak-style": 2,
         "lines-around-comment": 0,
@@ -142,10 +145,10 @@
         "operator-assignment": 2,
         "operator-linebreak": 0,
         "padded-blocks": 0,
-        "quote-props": 0,
-        "quotes": 0,
+        "quote-props": [2, "as-needed"],
+        "quotes": [2, "single"],
         "semi": [2, "never"],
-        "semi-spacing": 0,
+        "semi-spacing": 2,
         "sort-vars": 2,
         "space-after-keywords": 2,
         "space-before-blocks": 2,