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slider/node_modules/eslint-plugin-vue/lib/rules/define-emits-declaration.js

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+/**
+ * @author Amorites
+ * See LICENSE file in root directory for full license.
+ */
+'use strict'
+
+const utils = require('../utils')
+
+/**
+ * @typedef {import('@typescript-eslint/types').TSESTree.TypeNode} TypeNode
+ *
+ */
+
+module.exports = {
+  meta: {
+    type: 'suggestion',
+    docs: {
+      description: 'enforce declaration style of `defineEmits`',
+      categories: undefined,
+      url: 'https://eslint.vuejs.org/rules/define-emits-declaration.html'
+    },
+    fixable: null,
+    schema: [
+      {
+        enum: ['type-based', 'type-literal', 'runtime']
+      }
+    ],
+    messages: {
+      hasArg: 'Use type based declaration instead of runtime declaration.',
+      hasTypeArg: 'Use runtime declaration instead of type based declaration.',
+      hasTypeCallArg:
+        'Use new type literal declaration instead of the old call signature declaration.'
+    }
+  },
+  /** @param {RuleContext} context */
+  create(context) {
+    const scriptSetup = utils.getScriptSetupElement(context)
+    if (!scriptSetup || !utils.hasAttribute(scriptSetup, 'lang', 'ts')) {
+      return {}
+    }
+
+    const defineType = context.options[0] || 'type-based'
+    return utils.defineScriptSetupVisitor(context, {
+      onDefineEmitsEnter(node) {
+        switch (defineType) {
+          case 'type-based': {
+            if (node.arguments.length > 0) {
+              context.report({
+                node,
+                messageId: 'hasArg'
+              })
+            }
+            break
+          }
+
+          case 'type-literal': {
+            verifyTypeLiteral(node)
+            break
+          }
+
+          case 'runtime': {
+            const typeArguments =
+              'typeArguments' in node ? node.typeArguments : node.typeParameters
+            if (typeArguments && typeArguments.params.length > 0) {
+              context.report({
+                node,
+                messageId: 'hasTypeArg'
+              })
+            }
+            break
+          }
+        }
+      }
+    })
+
+    /** @param {CallExpression} node */
+    function verifyTypeLiteral(node) {
+      if (node.arguments.length > 0) {
+        context.report({
+          node,
+          messageId: 'hasArg'
+        })
+        return
+      }
+
+      const typeArguments = node.typeArguments || node.typeParameters
+      const param = /** @type {TypeNode|undefined} */ (typeArguments?.params[0])
+      if (!param) return
+      if (param.type === 'TSTypeLiteral') {
+        for (const memberNode of param.members) {
+          if (memberNode.type !== 'TSPropertySignature') {
+            context.report({
+              node: memberNode,
+              messageId: 'hasTypeCallArg'
+            })
+          }
+        }
+      } else if (param.type === 'TSFunctionType') {
+        context.report({
+          node: param,
+          messageId: 'hasTypeCallArg'
+        })
+      }
+    }
+  }
+}