feature: @putout/plugin-remove-unreachable-code: backtracking parents and enhancements

Signed-off-by: echo094 <[email protected]>

Author: echo094

packages/plugin-remove-unreachable-code/lib/remove-unreachable-code.js

@@ -17,24 +17,38 @@ module.exports.fix = ({siblings}) => {
     }
 };
 
-module.exports.traverse = ({push}) => ({
-    'ReturnStatement|ThrowStatement'(path) {
-        const siblings = path.getAllNextSiblings();
-        
-        if (!siblings.length)
-            return;
-        
+const processBlock = (push, path, leaf) => {
+    const siblings = path.getAllNextSiblings();
+    
+    if (!siblings.length)
+        return;
+    
+    if (leaf) {
         const [first] = siblings;
 
         if (!path.node.argument && (isBlockStatement(first) || isExpressionStatement(first)))
             return false;
-        
-        if (siblings.find(isFunctionDeclaration))
-            return;
-        
+    }
+    
+    for (const sibling of siblings) {
+        if (isFunctionDeclaration(sibling)) {
+            continue;
+        }
+    
         push({
-            path: siblings[0],
-            siblings,
+            path: sibling,
+            siblings: [sibling],
         });
+    }
+}
+
+module.exports.traverse = ({push}) => ({
+    'ReturnStatement|ThrowStatement'(path) {
+        let leaf = true
+        while (path.parentPath?.isBlockStatement()) {
+            processBlock(push, path, leaf)
+            path = path.parentPath
+            leaf = false
+        }
     },
 });