feature: @putout/plugin-labels: remove-unused: exclude when previous ReturnStatement without args

Author: coderaiser

packages/plugin-labels/lib/remove-unused/fixture/return.js

@@ -0,0 +1,4 @@
+return
+{
+    a: 5
+}

packages/plugin-labels/lib/remove-unused/index.js

@@ -1,6 +1,7 @@
 'use strict';
 
-const {operator} = require('putout');
+const {operator, types} = require('putout');
+const {isReturnStatement} = types;
 const {traverse, replaceWith} = operator;
 
 module.exports.report = ({name}) => `Label '${name}' is defined but never used`;
@@ -14,6 +15,9 @@ module.exports.traverse = ({push}) => ({
         const {label} = path.node;
         const {name} = label;
 
+        if (isPrevReturnWithoutArg(path))
+            return;
+        
         if (!usedLabel({path, name}))
             push({
                 path,
@@ -45,3 +49,12 @@ function usedLabel({path, name}) {
 
     return used;
 }
+
+function isPrevReturnWithoutArg({parentPath}) {
+    const retPath = parentPath.getPrevSibling();
+    
+    if (!isReturnStatement(retPath))
+        return false;
+    
+    return !retPath.node.argument;
+}

packages/plugin-labels/lib/remove-unused/index.spec.js

@@ -23,3 +23,8 @@ test('putout: remove-unused: transform: wrong', (t) => {
     t.transform('wrong');
     t.end();
 });
+
+test('putout: remove-unused: no report: return', (t) => {
+    t.noReport('return');
+    t.end();
+});