Update vue/custom-event-name-casing rule to support <script setup> (#1549)

Author: ota-meshi

Diff for: lib/rules/custom-event-name-casing.js

@@ -13,6 +13,10 @@ const utils = require('../utils')
 const casing = require('../utils/casing')
 const { toRegExp } = require('../utils/regexp')
 
+/**
+ * @typedef {import('../utils').VueObjectData} VueObjectData
+ */
+
 // ------------------------------------------------------------------------------
 // Helpers
 // ------------------------------------------------------------------------------
@@ -103,7 +107,7 @@ module.exports = {
   },
   /** @param {RuleContext} context */
   create(context) {
-    /** @type {Map<ObjectExpression, {contextReferenceIds:Set<Identifier>,emitReferenceIds:Set<Identifier>}>} */
+    /** @type {Map<ObjectExpression|Program, {contextReferenceIds:Set<Identifier>,emitReferenceIds:Set<Identifier>}>} */
     const setupContexts = new Map()
     const options =
       context.options.length === 1 && typeof context.options[0] !== 'string'
@@ -143,6 +147,46 @@ module.exports = {
       })
     }
 
+    const programNode = context.getSourceCode().ast
+
+    const callVisitor = {
+      /**
+       * @param {CallExpression} node
+       * @param {VueObjectData} [info]
+       */
+      CallExpression(node, info) {
+        const nameLiteralNode = getNameParamNode(node)
+        if (!nameLiteralNode) {
+          // cannot check
+          return
+        }
+
+        // verify setup context
+        const setupContext = setupContexts.get(info ? info.node : programNode)
+        if (setupContext) {
+          const { contextReferenceIds, emitReferenceIds } = setupContext
+          if (
+            node.callee.type === 'Identifier' &&
+            emitReferenceIds.has(node.callee)
+          ) {
+            // verify setup(props,{emit}) {emit()}
+            verify(nameLiteralNode)
+          } else {
+            const emit = getCalleeMemberNode(node)
+            if (
+              emit &&
+              emit.name === 'emit' &&
+              emit.member.object.type === 'Identifier' &&
+              contextReferenceIds.has(emit.member.object)
+            ) {
+              // verify setup(props,context) {context.emit()}
+              verify(nameLiteralNode)
+            }
+          }
+        }
+      }
+    }
+
     return utils.defineTemplateBodyVisitor(
       context,
       {
@@ -159,6 +203,36 @@ module.exports = {
         }
       },
       utils.compositingVisitors(
+        utils.defineScriptSetupVisitor(context, {
+          onDefineEmitsEnter(node) {
+            if (
+              !node.parent ||
+              node.parent.type !== 'VariableDeclarator' ||
+              node.parent.init !== node
+            ) {
+              return
+            }
+
+            const emitParam = node.parent.id
+            if (emitParam.type !== 'Identifier') {
+              return
+            }
+            // const emit = defineEmits()
+            const variable = findVariable(context.getScope(), emitParam)
+            if (!variable) {
+              return
+            }
+            const emitReferenceIds = new Set()
+            for (const reference of variable.references) {
+              emitReferenceIds.add(reference.identifier)
+            }
+            setupContexts.set(programNode, {
+              contextReferenceIds: new Set(),
+              emitReferenceIds
+            })
+          },
+          ...callVisitor
+        }),
         utils.defineVueVisitor(context, {
           onSetupFunctionEnter(node, { node: vueNode }) {
             const contextParam = utils.skipDefaultParamValue(node.params[1])
@@ -207,37 +281,7 @@ module.exports = {
               emitReferenceIds
             })
           },
-          CallExpression(node, { node: vueNode }) {
-            const nameLiteralNode = getNameParamNode(node)
-            if (!nameLiteralNode) {
-              // cannot check
-              return
-            }
-
-            // verify setup context
-            const setupContext = setupContexts.get(vueNode)
-            if (setupContext) {
-              const { contextReferenceIds, emitReferenceIds } = setupContext
-              if (
-                node.callee.type === 'Identifier' &&
-                emitReferenceIds.has(node.callee)
-              ) {
-                // verify setup(props,{emit}) {emit()}
-                verify(nameLiteralNode)
-              } else {
-                const emit = getCalleeMemberNode(node)
-                if (
-                  emit &&
-                  emit.name === 'emit' &&
-                  emit.member.object.type === 'Identifier' &&
-                  contextReferenceIds.has(emit.member.object)
-                ) {
-                  // verify setup(props,context) {context.emit()}
-                  verify(nameLiteralNode)
-                }
-              }
-            }
-          },
+          ...callVisitor,
           onVueObjectExit(node) {
             setupContexts.delete(node)
           }

Diff for: tests/lib/rules/custom-event-name-casing.js

@@ -478,6 +478,22 @@ tester.run('custom-event-name-casing', rule, {
         "Custom event name 'bar-baz' must be camelCase.",
         "Custom event name 'baz-qux' must be camelCase."
       ]
+    },
+    {
+      filename: 'test.vue',
+      code: `
+      <script setup>
+      const emit = defineEmits({})
+      emit('fooBar')
+      emit('foo-bar')
+      </script>
+      `,
+      errors: [
+        {
+          message: "Custom event name 'fooBar' must be kebab-case.",
+          line: 4
+        }
+      ]
     }
   ]
 })