eslint: detect unreachable code

Author: kesha-antonov

.eslintrc.cjs

@@ -111,6 +111,7 @@ module.exports = {
     'brace-style': ['error', '1tbs', { allowSingleLine: false }],
     'nonblock-statement-body-position': ['error', 'below'],
     '@stylistic/jsx-closing-bracket-location': ['error', 'line-aligned'],
+    'no-unreachable': 'error',
   },
   globals: {
     describe: 'readonly',

src/Day.tsx

@@ -57,8 +57,6 @@ export function Day<TMessage extends IMessage = IMessage> ({
   if (currentMessage == null || isSameDay(currentMessage, previousMessage))
     return null
 
-  return null
-
   return (
     <View style={[styles.container, containerStyle]}>
       <View style={wrapperStyle}>

tsconfig.json

@@ -12,6 +12,8 @@
     "experimentalDecorators": true,
     "preserveConstEnums": true,
     "sourceMap": true,
+    "allowJs": true,
+    "checkJs": true,
     "strictNullChecks": true,
     "skipDefaultLibCheck": true,
     "skipLibCheck": true,