feat: autofix in define-props-declaration: runtime syntax to type-based syntax (vuejs#2465)

handle required option

Author: mpiniarski

Diff for: lib/rules/define-props-declaration.js

@@ -89,10 +89,8 @@ module.exports = {
             if (typeArgument === undefined) {
               return null
             }
-            
-            const text = sourceCode.getText(typeArgument)
-            
-            return text
+
+            return sourceCode.getText(typeArgument)
           }
           return optionGetType(typeProperty.value)
         }
@@ -113,6 +111,26 @@ module.exports = {
       return null
     }
 
+    /**
+     * @param {Expression} node
+     * @returns {boolean | undefined }
+     */
+    function optionGetRequired(node) {
+      if (node.type === 'ObjectExpression') {
+        const requiredProperty = utils.findProperty(node, 'required')
+        if (requiredProperty == null) {
+          return undefined
+        }
+
+        if (requiredProperty.value.type === 'Literal') {
+          return Boolean(requiredProperty.value.value)
+        }
+      }
+
+      // Unknown
+      return undefined
+    }
+
     const scriptSetup = utils.getScriptSetupElement(context)
     if (!scriptSetup || !utils.hasAttribute(scriptSetup, 'lang', 'ts')) {
       return {}
@@ -129,7 +147,7 @@ module.exports = {
                 messageId: 'hasArg',
                 *fix(fixer) {
                   const propTypes = props.map((prop) => {
-                    const unknownType = { name: prop.propName, type: 'unknown' }
+                    const unknownType = { name: prop.propName, type: 'unknown', required: undefined }
 
                     if (prop.type !== 'object') {
                       return unknownType
@@ -138,15 +156,20 @@ module.exports = {
                     if (type === null) {
                       return unknownType
                     }
+                    const required = optionGetRequired(prop.value)
 
                     return {
                       name: prop.propName,
-                      type: mapNativeType(type)
+                      type: mapNativeType(type),
+                      required
                     }
                   })
 
                   const definePropsType = `{ ${propTypes
-                    .map(({ name, type }) => `${name}: ${type}`)
+                    .map(
+                      ({ name, type, required }) =>
+                        `${name}${required === false ? '?' : ''}: ${type}`
+                    )
                     .join(', ')} }`
 
                   yield fixer.insertTextAfter(

Diff for: tests/lib/rules/define-props-declaration.js

@@ -386,6 +386,56 @@ tester.run('define-props-declaration', rule, {
           line: 3
         }
       ]
+    },
+    // required
+    {
+      filename: 'test.vue',
+      code: `
+        <script setup lang="ts">
+        const props = defineProps({
+          kind: {
+            type: String,
+            required: true
+          }
+        })
+        </script>
+        `,
+      output: `
+        <script setup lang="ts">
+        const props = defineProps<{ kind: string }>()
+        </script>
+        `,
+      errors: [
+        {
+          message: 'Use type-based declaration instead of runtime declaration.',
+          line: 3
+        }
+      ]
+    },
+    // not required
+    {
+      filename: 'test.vue',
+      code: `
+        <script setup lang="ts">
+        const props = defineProps({
+          kind: {
+            type: String,
+            required: false
+          }
+        })
+        </script>
+        `,
+      output: `
+        <script setup lang="ts">
+        const props = defineProps<{ kind?: string }>()
+        </script>
+        `,
+      errors: [
+        {
+          message: 'Use type-based declaration instead of runtime declaration.',
+          line: 3
+        }
+      ]
     }
   ]
 })