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app_vue/node_modules/eslint-plugin-vue/lib/rules/no-template-shadow.js

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+/**
+ * @fileoverview Disallow variable declarations from shadowing variables declared in the outer scope.
+ * @author Armano
+ */
+'use strict'
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+const utils = require('../utils')
+
+/**
+ * @typedef {import('../utils').GroupName} GroupName
+ */
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+
+/** @type {GroupName[]} */
+const GROUP_NAMES = [
+  'props',
+  'computed',
+  'data',
+  'asyncData',
+  'methods',
+  'setup'
+]
+
+module.exports = {
+  meta: {
+    type: 'suggestion',
+    docs: {
+      description:
+        'disallow variable declarations from shadowing variables declared in the outer scope',
+      categories: ['vue3-strongly-recommended', 'strongly-recommended'],
+      url: 'https://eslint.vuejs.org/rules/no-template-shadow.html'
+    },
+    fixable: null,
+    schema: []
+  },
+  /** @param {RuleContext} context */
+  create(context) {
+    /** @type {Set<string>} */
+    const jsVars = new Set()
+
+    /**
+     * @typedef {object} ScopeStack
+     * @property {ScopeStack | null} parent
+     * @property {Identifier[]} nodes
+     */
+    /** @type {ScopeStack | null} */
+    let scopeStack = null
+
+    // ----------------------------------------------------------------------
+    // Public
+    // ----------------------------------------------------------------------
+
+    return utils.compositingVisitors(
+      utils.isScriptSetup(context)
+        ? {
+            Program() {
+              const globalScope =
+                context.getSourceCode().scopeManager.globalScope
+              if (!globalScope) {
+                return
+              }
+              for (const variable of globalScope.variables) {
+                if (variable.defs.length > 0) {
+                  jsVars.add(variable.name)
+                }
+              }
+              const moduleScope = globalScope.childScopes.find(
+                (scope) => scope.type === 'module'
+              )
+              if (!moduleScope) {
+                return
+              }
+              for (const variable of moduleScope.variables) {
+                if (variable.defs.length > 0) {
+                  jsVars.add(variable.name)
+                }
+              }
+            }
+          }
+        : {},
+      utils.defineScriptSetupVisitor(context, {
+        onDefinePropsEnter(_node, props) {
+          for (const prop of props) {
+            if (prop.propName) {
+              jsVars.add(prop.propName)
+            }
+          }
+        }
+      }),
+      utils.executeOnVue(context, (obj) => {
+        const properties = Array.from(
+          utils.iterateProperties(obj, new Set(GROUP_NAMES))
+        )
+        for (const node of properties) {
+          jsVars.add(node.name)
+        }
+      }),
+      utils.defineTemplateBodyVisitor(context, {
+        /** @param {VElement} node */
+        VElement(node) {
+          scopeStack = {
+            parent: scopeStack,
+            nodes: scopeStack ? [...scopeStack.nodes] : []
+          }
+          for (const variable of node.variables) {
+            const varNode = variable.id
+            const name = varNode.name
+            if (
+              scopeStack.nodes.some((node) => node.name === name) ||
+              jsVars.has(name)
+            ) {
+              context.report({
+                node: varNode,
+                loc: varNode.loc,
+                message:
+                  "Variable '{{name}}' is already declared in the upper scope.",
+                data: {
+                  name
+                }
+              })
+            } else {
+              scopeStack.nodes.push(varNode)
+            }
+          }
+        },
+        'VElement:exit'() {
+          scopeStack = scopeStack && scopeStack.parent
+        }
+      })
+    )
+  }
+}