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qwen/nodejs/node_modules/eslint/lib/rules/no-alert.js

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+/**
+ * @fileoverview Rule to flag use of alert, confirm, prompt
+ * @author Nicholas C. Zakas
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const {
+    getStaticPropertyName: getPropertyName,
+    getVariableByName,
+    skipChainExpression
+} = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Checks if the given name is a prohibited identifier.
+ * @param {string} name The name to check
+ * @returns {boolean} Whether or not the name is prohibited.
+ */
+function isProhibitedIdentifier(name) {
+    return /^(alert|confirm|prompt)$/u.test(name);
+}
+
+/**
+ * Finds the eslint-scope reference in the given scope.
+ * @param {Object} scope The scope to search.
+ * @param {ASTNode} node The identifier node.
+ * @returns {Reference|null} Returns the found reference or null if none were found.
+ */
+function findReference(scope, node) {
+    const references = scope.references.filter(reference => reference.identifier.range[0] === node.range[0] &&
+            reference.identifier.range[1] === node.range[1]);
+
+    if (references.length === 1) {
+        return references[0];
+    }
+    return null;
+}
+
+/**
+ * Checks if the given identifier node is shadowed in the given scope.
+ * @param {Object} scope The current scope.
+ * @param {string} node The identifier node to check
+ * @returns {boolean} Whether or not the name is shadowed.
+ */
+function isShadowed(scope, node) {
+    const reference = findReference(scope, node);
+
+    return reference && reference.resolved && reference.resolved.defs.length > 0;
+}
+
+/**
+ * Checks if the given identifier node is a ThisExpression in the global scope or the global window property.
+ * @param {Object} scope The current scope.
+ * @param {string} node The identifier node to check
+ * @returns {boolean} Whether or not the node is a reference to the global object.
+ */
+function isGlobalThisReferenceOrGlobalWindow(scope, node) {
+    if (scope.type === "global" && node.type === "ThisExpression") {
+        return true;
+    }
+    if (
+        node.type === "Identifier" &&
+        (
+            node.name === "window" ||
+            (node.name === "globalThis" && getVariableByName(scope, "globalThis"))
+        )
+    ) {
+        return !isShadowed(scope, node);
+    }
+
+    return false;
+}
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+/** @type {import('../shared/types').Rule} */
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "Disallow the use of `alert`, `confirm`, and `prompt`",
+            recommended: false,
+            url: "https://eslint.org/docs/latest/rules/no-alert"
+        },
+
+        schema: [],
+
+        messages: {
+            unexpected: "Unexpected {{name}}."
+        }
+    },
+
+    create(context) {
+        const sourceCode = context.sourceCode;
+
+        return {
+            CallExpression(node) {
+                const callee = skipChainExpression(node.callee),
+                    currentScope = sourceCode.getScope(node);
+
+                // without window.
+                if (callee.type === "Identifier") {
+                    const name = callee.name;
+
+                    if (!isShadowed(currentScope, callee) && isProhibitedIdentifier(callee.name)) {
+                        context.report({
+                            node,
+                            messageId: "unexpected",
+                            data: { name }
+                        });
+                    }
+
+                } else if (callee.type === "MemberExpression" && isGlobalThisReferenceOrGlobalWindow(currentScope, callee.object)) {
+                    const name = getPropertyName(callee);
+
+                    if (isProhibitedIdentifier(name)) {
+                        context.report({
+                            node,
+                            messageId: "unexpected",
+                            data: { name }
+                        });
+                    }
+                }
+            }
+        };
+
+    }
+};