[New] jsx-first-prop-new-line: add multiprop option

Author: haydncomley

CHANGELOG.md

@@ -7,13 +7,15 @@ This change log adheres to standards from [Keep a CHANGELOG](https://keepachange
 
 ### Added
 * [`display-name`]: add `checkContextObjects` option ([#3529][] @JulesBlm)
+* [`jsx-first-prop-new-line`]: add `multiprop` option ([#3533][] @haydncomley)
 
 ### Fixed
 * [`no-array-index-key`]: consider flatMap ([#3530][] @k-yle)
 * [`jsx-curly-brace-presence`]: handle single and only expression template literals ([#3538][] @taozhou-glean)
 * [`no-unknown-property`]: allow `onLoad` on `source` (@ljharb)
 
 [#3538]: https://github.com/jsx-eslint/eslint-plugin-react/pull/3538
+[#3533]: https://github.com/jsx-eslint/eslint-plugin-react/pull/3533
 [#3530]: https://github.com/jsx-eslint/eslint-plugin-react/pull/3530
 [#3529]: https://github.com/jsx-eslint/eslint-plugin-react/pull/3529
 

docs/rules/jsx-first-prop-new-line.md

@@ -15,6 +15,7 @@ This rule checks whether the first property of all JSX elements is correctly pla
 - `always`: The first property should always be placed on a new line.
 - `never` : The first property should never be placed on a new line, e.g. should always be on the same line as the Component opening tag.
 - `multiline`: The first property should always be placed on a new line when the JSX tag takes up multiple lines.
+- `multiprop`: The first property should never be placed on a new line unless there are multiple properties.
 - `multiline-multiprop`: The first property should always be placed on a new line if the JSX tag takes up multiple lines and there are multiple properties. This is the `default` value.
 
 Examples of **incorrect** code for this rule, when configured with `"always"`:

lib/rules/jsx-first-prop-new-line.js

@@ -30,7 +30,7 @@ module.exports = {
     messages,
 
     schema: [{
-      enum: ['always', 'never', 'multiline', 'multiline-multiprop'],
+      enum: ['always', 'never', 'multiline', 'multiline-multiprop', 'multiprop'],
     }],
   },
 
@@ -46,6 +46,7 @@ module.exports = {
         if (
           (configuration === 'multiline' && isMultilineJSX(node))
           || (configuration === 'multiline-multiprop' && isMultilineJSX(node) && node.attributes.length > 1)
+          || (configuration === 'multiprop' && node.attributes.length > 1)
           || (configuration === 'always')
         ) {
           node.attributes.some((decl) => {
@@ -59,7 +60,10 @@ module.exports = {
             }
             return true;
           });
-        } else if (configuration === 'never' && node.attributes.length > 0) {
+        } else if (
+          (configuration === 'never' && node.attributes.length > 0)
+          || (configuration === 'multiprop' && isMultilineJSX(node) && node.attributes.length <= 1)
+        ) {
           const firstNode = node.attributes[0];
           if (node.loc.start.line < firstNode.loc.start.line) {
             report(context, messages.propOnSameLine, 'propOnSameLine', {

tests/lib/rules/jsx-first-prop-new-line.js

@@ -139,6 +139,24 @@ ruleTester.run('jsx-first-prop-new-line', rule, {
       `,
       options: ['always'],
     },
+    {
+      code: `
+        <Foo />
+      `,
+      options: ['multiprop'],
+    },
+    {
+      code: `
+        <Foo bar />
+      `,
+      options: ['multiprop'],
+    },
+    {
+      code: `
+        <Foo {...this.props} />
+      `,
+      options: ['multiprop'],
+    },
   ]),
 
   invalid: parsers.all([
@@ -209,5 +227,38 @@ bar={{
       options: ['multiline-multiprop'],
       errors: [{ messageId: 'propOnNewLine' }],
     },
+    {
+      code: `
+      <Foo propOne="one" propTwo="two" />
+      `,
+      output: `
+      <Foo
+propOne="one" propTwo="two" />
+      `,
+      options: ['multiprop'],
+      errors: [{ messageId: 'propOnNewLine' }],
+    },
+    {
+      code: `
+      <Foo
+bar />
+      `,
+      output: `
+      <Foo bar />
+      `,
+      options: ['multiprop'],
+      errors: [{ messageId: 'propOnSameLine' }],
+    },
+    {
+      code: `
+      <Foo
+{...this.props} />
+      `,
+      output: `
+      <Foo {...this.props} />
+      `,
+      options: ['multiprop'],
+      errors: [{ messageId: 'propOnSameLine' }],
+    },
   ]),
 });