Potential autofix improvement for jsx-wrap-mulitlines

This change should remove the newline that comes before a parentheses,
if "parens-new-line" is specified as option and the multiline jsx
starts on a new line. The autofix will also inject the closing parentheses
before the next enclosing character as opposed to being on its own line.

Author: sharmilajesupaul

lib/rules/jsx-wrap-multilines.js

@@ -104,14 +104,21 @@ module.exports = {
       return node.loc.start.line !== node.loc.end.line;
     }
 
-    function report(node, message, fixerFn) {
+    function report(node, message, fix) {
       context.report({
-        node: node,
-        message: message,
-        fix: fixerFn
+        node,
+        message,
+        fix
       });
     }
 
+    function trimTokenBeforeNewline(node, tokenBefore) {
+      // if the token before the jsx is a bracket or curly brace
+      // we don't want a space between the opening parentheses and the multiline jsx
+      const isBracket = tokenBefore.value === '{' || tokenBefore.value === '[';
+      return `${tokenBefore.value.trim()}${isBracket ? '' : ' '}`;
+    }
+
     function check(node, type) {
       if (!node || node.type !== 'JSXElement') {
         return;
@@ -125,7 +132,21 @@ module.exports = {
 
       if (option === 'parens-new-line' && isMultilines(node)) {
         if (!isParenthesised(node)) {
-          report(node, MISSING_PARENS, fixer => fixer.replaceText(node, `(\n${sourceCode.getText(node)}\n)`));
+          const tokenBefore = sourceCode.getTokenBefore(node, {includeComments: true});
+          const tokenAfter = sourceCode.getTokenAfter(node, {includeComments: true});
+          if (tokenBefore.loc.end.line < node.loc.start.line) {
+            // Strip newline after operator if parens newline is specified
+            report(
+              node,
+              MISSING_PARENS,
+              fixer => fixer.replaceTextRange(
+                [tokenBefore.range[0], tokenAfter.range[0]],
+                `${trimTokenBeforeNewline(node, tokenBefore)}(\n${sourceCode.getText(node)}\n)`
+              )
+            );
+          } else {
+            report(node, MISSING_PARENS, fixer => fixer.replaceText(node, `(\n${sourceCode.getText(node)}\n)`));
+          }
         } else if (needsNewLines(node)) {
           report(node, PARENS_NEW_LINES, fixer => fixer.replaceText(node, `\n${sourceCode.getText(node)}\n`));
         }
@@ -135,7 +156,6 @@ module.exports = {
     // --------------------------------------------------------------------------
     // Public
     // --------------------------------------------------------------------------
-
     return {
 
       VariableDeclarator: function(node) {
@@ -171,7 +191,7 @@ module.exports = {
         }
       },
 
-      'ArrowFunctionExpression:exit': function (node) {
+      'ArrowFunctionExpression:exit': function(node) {
         const arrowBody = node.body;
         const type = 'arrow';
 
@@ -195,7 +215,7 @@ module.exports = {
         }
       },
 
-      JSXAttribute: function (node) {
+      JSXAttribute: function(node) {
         const type = 'prop';
         if (isEnabled(type) && node.value && node.value.type === 'JSXExpressionContainer') {
           check(node.value.expression, type);

tests/lib/rules/jsx-wrap-multilines.js

@@ -249,6 +249,14 @@ const LOGICAL_NO_PAREN = `
   </div>
 `;
 
+const LOGICAL_PAREN_NEW_LINE_AUTOFIX = `
+  <div>
+    {foo && (\n<div>
+        <p>Hello World</p>
+      </div>\n)}
+  </div>
+`;
+
 const LOGICAL_PAREN_NEW_LINE = `
   <div>
     {foo && (
@@ -291,6 +299,14 @@ const ATTR_PAREN_NEW_LINE = `
   </div>
 `;
 
+const ATTR_PAREN_NEW_LINE_AUTOFIX = `
+  <div prop={(\n<div>
+      <p>Hello</p>
+    </div>\n)}>
+    <p>Hello</p>
+  </div>
+`;
+
 function addNewLineSymbols(code) {
   return code.replace(/\(</g, '(\n<').replace(/>\)/g, '>\n)');
 }
@@ -640,7 +656,7 @@ ruleTester.run('jsx-wrap-multilines', rule, {
       errors: [{message: PARENS_NEW_LINES}]
     }, {
       code: LOGICAL_NO_PAREN,
-      output: addNewLineSymbols(LOGICAL_PAREN),
+      output: LOGICAL_PAREN_NEW_LINE_AUTOFIX,
       options: [{logical: 'parens-new-line'}],
       errors: [{message: MISSING_PARENS}]
     }, {
@@ -650,9 +666,8 @@ ruleTester.run('jsx-wrap-multilines', rule, {
       errors: [{message: PARENS_NEW_LINES}]
     }, {
       code: ATTR_NO_PAREN,
-      output: addNewLineSymbols(ATTR_PAREN),
+      output: ATTR_PAREN_NEW_LINE_AUTOFIX,
       options: [{prop: 'parens-new-line'}],
       errors: [{message: MISSING_PARENS}]
-    }
-  ]
+    }]
 });