eslint: add key-spacing and space-unary-ops rules

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

.eslintrc.js

@@ -69,6 +69,10 @@ module.exports = {
     eqeqeq: 'error',
     indent: ['error', 2],
     'jsx-quotes': ['error', 'prefer-single'],
+    'key-spacing': [
+      'error',
+      { mode: 'minimum' },
+    ],
     'no-catch-shadow': 'error',
     'no-cond-assign': 'error',
     'no-console': [
@@ -111,6 +115,13 @@ module.exports = {
     'prefer-const': 'error',
     quotes: ['error', 'single'],
     semi: 'error',
+    'space-unary-ops': [
+      'error',
+      {
+        words: true,
+        nonwords: false,
+      },
+    ],
     strict: 'off',
     'valid-typeof': 'error',