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app_vue/node_modules/eslint-plugin-vue/lib/rules/script-setup-uses-vars.js

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+/**
+ * @author Yosuke Ota
+ * See LICENSE file in root directory for full license.
+ */
+'use strict'
+
+const { getStyleVariablesContext } = require('../utils/style-variables')
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+const utils = require('../utils')
+const casing = require('../utils/casing')
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    type: 'problem',
+    docs: {
+      description:
+        'prevent `<script setup>` variables used in `<template>` to be marked as unused', // eslint-disable-line eslint-plugin/require-meta-docs-description
+      categories: ['base'],
+      url: 'https://eslint.vuejs.org/rules/script-setup-uses-vars.html'
+    },
+    schema: []
+  },
+  /**
+   * @param {RuleContext} context - The rule context.
+   * @returns {RuleListener} AST event handlers.
+   */
+  create(context) {
+    if (!utils.isScriptSetup(context)) {
+      return {}
+    }
+    /** @type {Set<string>} */
+    const scriptVariableNames = new Set()
+    const globalScope = context.getSourceCode().scopeManager.globalScope
+    if (globalScope) {
+      for (const variable of globalScope.variables) {
+        scriptVariableNames.add(variable.name)
+      }
+      const moduleScope = globalScope.childScopes.find(
+        (scope) => scope.type === 'module'
+      )
+      for (const variable of (moduleScope && moduleScope.variables) || []) {
+        scriptVariableNames.add(variable.name)
+      }
+    }
+
+    /**
+     * `casing.camelCase()` converts the beginning to lowercase,
+     * but does not convert the case of the beginning character when converting with Vue3.
+     * @see https://github.com/vuejs/vue-next/blob/2749c15170ad4913e6530a257db485d4e7ed2283/packages/shared/src/index.ts#L116
+     * @param {string} str
+     */
+    function camelize(str) {
+      return str.replace(/-(\w)/g, (_, c) => (c ? c.toUpperCase() : ''))
+    }
+    /**
+     * @see https://github.com/vuejs/vue-next/blob/2749c15170ad4913e6530a257db485d4e7ed2283/packages/compiler-core/src/transforms/transformElement.ts#L333
+     * @param {string} name
+     */
+    function markSetupReferenceVariableAsUsed(name) {
+      if (scriptVariableNames.has(name)) {
+        context.markVariableAsUsed(name)
+        return true
+      }
+      const camelName = camelize(name)
+      if (scriptVariableNames.has(camelName)) {
+        context.markVariableAsUsed(camelName)
+        return true
+      }
+      const pascalName = casing.capitalize(camelName)
+      if (scriptVariableNames.has(pascalName)) {
+        context.markVariableAsUsed(pascalName)
+        return true
+      }
+      return false
+    }
+
+    return utils.defineTemplateBodyVisitor(
+      context,
+      {
+        VExpressionContainer(node) {
+          for (const ref of node.references.filter(
+            (ref) => ref.variable == null
+          )) {
+            context.markVariableAsUsed(ref.id.name)
+          }
+        },
+        VElement(node) {
+          if (
+            (!utils.isHtmlElementNode(node) && !utils.isSvgElementNode(node)) ||
+            (node.rawName === node.name &&
+              (utils.isHtmlWellKnownElementName(node.rawName) ||
+                utils.isSvgWellKnownElementName(node.rawName))) ||
+            utils.isBuiltInComponentName(node.rawName)
+          ) {
+            return
+          }
+          if (!markSetupReferenceVariableAsUsed(node.rawName)) {
+            // Check namespace
+            // https://github.com/vuejs/vue-next/blob/2749c15170ad4913e6530a257db485d4e7ed2283/packages/compiler-core/src/transforms/transformElement.ts#L304
+            const dotIndex = node.rawName.indexOf('.')
+            if (dotIndex > 0) {
+              markSetupReferenceVariableAsUsed(node.rawName.slice(0, dotIndex))
+            }
+          }
+        },
+        /** @param {VDirective} node */
+        'VAttribute[directive=true]'(node) {
+          if (utils.isBuiltInDirectiveName(node.key.name.name)) {
+            return
+          }
+          markSetupReferenceVariableAsUsed(`v-${node.key.name.rawName}`)
+        },
+        /** @param {VAttribute} node */
+        'VAttribute[directive=false]'(node) {
+          if (node.key.name === 'ref' && node.value) {
+            context.markVariableAsUsed(node.value.value)
+          }
+        }
+      },
+      {
+        Program() {
+          const styleVars = getStyleVariablesContext(context)
+          if (styleVars) {
+            for (const ref of styleVars.references) {
+              context.markVariableAsUsed(ref.id.name)
+            }
+          }
+        }
+      },
+      {
+        templateBodyTriggerSelector: 'Program'
+      }
+    )
+  }
+}