[New] jsx-boolean-value: add assumeUndefinedIsFalse option

Author: developer-bandi

CHANGELOG.md

@@ -14,6 +14,7 @@ This change log adheres to standards from [Keep a CHANGELOG](https://keepachange
 * [`no-unknown-property`]: support `onResize` on audio/video tags ([#3662][] @caesar1030)
 * [`jsx-wrap-multilines`]: add `never` option to prohibit wrapping parens on multiline JSX ([#3668][] @reedws)
 * [`jsx-filename-extension`]: add `ignoreFilesWithoutCode` option to allow empty files ([#3674][] @burtek)
+* [`jsx-boolean-value`]: add `assumeUndefinedIsFalse` option ([#3675][] @developer-bandi)
 
 ### Fixed
 * [`jsx-no-leaked-render`]: preserve RHS parens for multiline jsx elements while fixing ([#3623][] @akulsr0)
@@ -29,6 +30,7 @@ This change log adheres to standards from [Keep a CHANGELOG](https://keepachange
 * [Docs] [`jsx-key`]: fix correct example ([#3656][] @developer-bandi)
 * [Tests] `jsx-wrap-multilines`: passing tests ([#3545][] @burtek)
 
+[#3675]: https://github.com/jsx-eslint/eslint-plugin-react/pull/3675
 [#3674]: https://github.com/jsx-eslint/eslint-plugin-react/pull/3674
 [#3668]: https://github.com/jsx-eslint/eslint-plugin-react/pull/3668
 [#3666]: https://github.com/jsx-eslint/eslint-plugin-react/pull/3666

docs/rules/jsx-boolean-value.md

@@ -14,7 +14,11 @@ This rule will enforce one or the other to keep consistency in your code.
 
 This rule takes two arguments. If the first argument is `"always"` then it warns whenever an attribute is missing its value. If `"never"` then it warns if an attribute has a `true` value. The default value of this option is `"never"`.
 
-The second argument is optional: if provided, it must be an object with a `"never"` property (if the first argument is `"always"`), or an `"always"` property (if the first argument is `"never"`). This property’s value must be an array of strings representing prop names.
+The second argument is optional. If provided, it must be an object. These properties are supported:
+
+First, the `"never"` and `"always"` properties are one set. The two properties cannot be set together. `"never"` must be used when the first argument is `"always"` and `"always"`  must be used when the first argument is `"never"`. This property’s value must be an array of strings representing prop names.
+
+When the first argument is `"never"`, a boolean `"assumeUndefinedIsFalse"` may be provided, which defaults to `false`. When `true`, an absent boolean prop will be treated as if it were explicitly set to `false`.
 
 Examples of **incorrect** code for this rule, when configured with `"never"`, or with `"always", { "never": ["personal"] }`:
 
@@ -40,6 +44,18 @@ Examples of **correct** code for this rule, when configured with `"always"`, or
 var Hello = <Hello personal={true} />;
 ```
 
+Examples of **incorrect** code for this rule, when configured with `"never", { "assumeUndefinedIsFalse": true }`, or with  `"always", { "never": ["personal"], "assumeUndefinedIsFalse": true }`:
+
+```jsx
+var Hello = <Hello personal={false} />;
+```
+
+Examples of **correct** code for this rule, when configured with `"never", { "assumeUndefinedIsFalse": true }`, or with  `"always", { "never": ["personal"], "assumeUndefinedIsFalse": true }`:
+
+```jsx
+var Hello = <Hello />;
+```
+
 ## When Not To Use It
 
 If you do not want to enforce any style for boolean attributes, then you can disable this rule.

lib/rules/jsx-boolean-value.js

@@ -39,7 +39,7 @@ function getErrorData(exceptions) {
  * @param {Set<string>} exceptions
  * @param {string} propName
  * @returns {boolean} propName
-*/
+ */
 function isAlways(configuration, exceptions, propName) {
   const isException = exceptions.has(propName);
   if (configuration === ALWAYS) {
@@ -66,6 +66,8 @@ const messages = {
   omitBoolean_noMessage: 'Value must be omitted for boolean attributes',
   setBoolean: 'Value must be set for boolean attributes{{exceptionsMessage}}',
   setBoolean_noMessage: 'Value must be set for boolean attributes',
+  omitPropAndBoolean: 'Value and Prop must be omitted for false attributes{{exceptionsMessage}}',
+  omitPropAndBoolean_noMessage: 'Value and Prop must be omitted for false attributes',
 };
 
 module.exports = {
@@ -94,6 +96,9 @@ module.exports = {
           additionalProperties: false,
           properties: {
             [NEVER]: exceptionsSchema,
+            assumeUndefinedIsFalse: {
+              type: 'boolean',
+            },
           },
         }],
         additionalItems: false,
@@ -106,6 +111,9 @@ module.exports = {
           additionalProperties: false,
           properties: {
             [ALWAYS]: exceptionsSchema,
+            assumeUndefinedIsFalse: {
+              type: 'boolean',
+            },
           },
         }],
         additionalItems: false,
@@ -139,6 +147,7 @@ module.exports = {
         }
         if (
           isNever(configuration, exceptions, propName)
+          && !configObject.assumeUndefinedIsFalse
           && value
           && value.type === 'JSXExpressionContainer'
           && value.expression.value === true
@@ -153,6 +162,26 @@ module.exports = {
             },
           });
         }
+        if (
+          isNever(configuration, exceptions, propName)
+          && configObject.assumeUndefinedIsFalse
+          && value
+          && value.type === 'JSXExpressionContainer'
+          && value.expression.value === false
+        ) {
+          const data = getErrorData(exceptions);
+          const messageId = data.exceptionsMessage
+            ? 'omitPropAndBoolean'
+            : 'omitPropAndBoolean_noMessage';
+
+          report(context, messages[messageId], messageId, {
+            node,
+            data,
+            fix(fixer) {
+              return fixer.removeRange([node.name.range[0], value.range[1]]);
+            },
+          });
+        }
       },
     };
   },

tests/lib/rules/jsx-boolean-value.js

@@ -48,6 +48,14 @@ ruleTester.run('jsx-boolean-value', rule, {
       code: '<App foo={true} bar />;',
       options: ['never', { always: ['foo'] }],
     },
+    {
+      code: '<App />;',
+      options: ['never', { assumeUndefinedIsFalse: true }],
+    },
+    {
+      code: '<App foo={false} />;',
+      options: ['never', { assumeUndefinedIsFalse: true, always: ['foo'] }],
+    },
   ]),
   invalid: parsers.all([
     {
@@ -110,5 +118,32 @@ ruleTester.run('jsx-boolean-value', rule, {
         },
       ],
     },
+    {
+      code: '<App foo={false} bak={false} />;',
+      output: '<App   />;',
+      options: ['never', { assumeUndefinedIsFalse: true }],
+      errors: [
+        { messageId: 'omitPropAndBoolean_noMessage' },
+        { messageId: 'omitPropAndBoolean_noMessage' },
+      ],
+    },
+    {
+      code: '<App foo={true} bar={false} baz={false} bak={false} />;',
+      output: '<App foo={true} bar={false}   />;',
+      options: [
+        'always',
+        { assumeUndefinedIsFalse: true, never: ['baz', 'bak'] },
+      ],
+      errors: [
+        {
+          messageId: 'omitPropAndBoolean',
+          data: { exceptionsMessage: ' for the following props: `baz`, `bak`' },
+        },
+        {
+          messageId: 'omitPropAndBoolean',
+          data: { exceptionsMessage: ' for the following props: `baz`, `bak`' },
+        },
+      ],
+    },
   ]),
 });