feat(typescript): explicit-function-return-type

Signed-off-by: Valentin Popov <info@valentineus.link>

ROADMAP.md

@@ -394,7 +394,7 @@
 - [ ] "consistent-type-assertions"
 - [ ] "consistent-type-definitions"
 - [ ] "default-param-last"
-- [ ] "explicit-function-return-type"
+- [X] "explicit-function-return-type"
 - [ ] "explicit-member-accessibility"
 - [ ] "explicit-module-boundary-types"
 - [ ] "func-call-spacing"

src/rules/typescript/default.json

@@ -9,6 +9,14 @@
       "before": false
     }
   ],
+  "@typescript-eslint/explicit-function-return-type": [
+    "error",
+    {
+      "allowExpressions": false,
+      "allowHigherOrderFunctions": false,
+      "allowTypedFunctionExpressions": false
+    }
+  ],
   "@typescript-eslint/indent": [
     "error",
     "tab",