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qwen/nodejs/node_modules/eslint/lib/rules/no-unsafe-finally.js

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+/**
+ * @fileoverview Rule to flag unsafe statements in finally block
+ * @author Onur Temizkan
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+const SENTINEL_NODE_TYPE_RETURN_THROW = /^(?:Program|(?:Function|Class)(?:Declaration|Expression)|ArrowFunctionExpression)$/u;
+const SENTINEL_NODE_TYPE_BREAK = /^(?:Program|(?:Function|Class)(?:Declaration|Expression)|ArrowFunctionExpression|DoWhileStatement|WhileStatement|ForOfStatement|ForInStatement|ForStatement|SwitchStatement)$/u;
+const SENTINEL_NODE_TYPE_CONTINUE = /^(?:Program|(?:Function|Class)(?:Declaration|Expression)|ArrowFunctionExpression|DoWhileStatement|WhileStatement|ForOfStatement|ForInStatement|ForStatement)$/u;
+
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+/** @type {import('../shared/types').Rule} */
+module.exports = {
+    meta: {
+        type: "problem",
+
+        docs: {
+            description: "Disallow control flow statements in `finally` blocks",
+            recommended: true,
+            url: "https://eslint.org/docs/latest/rules/no-unsafe-finally"
+        },
+
+        schema: [],
+
+        messages: {
+            unsafeUsage: "Unsafe usage of {{nodeType}}."
+        }
+    },
+    create(context) {
+
+        /**
+         * Checks if the node is the finalizer of a TryStatement
+         * @param {ASTNode} node node to check.
+         * @returns {boolean} - true if the node is the finalizer of a TryStatement
+         */
+        function isFinallyBlock(node) {
+            return node.parent.type === "TryStatement" && node.parent.finalizer === node;
+        }
+
+        /**
+         * Climbs up the tree if the node is not a sentinel node
+         * @param {ASTNode} node node to check.
+         * @param {string} label label of the break or continue statement
+         * @returns {boolean} - return whether the node is a finally block or a sentinel node
+         */
+        function isInFinallyBlock(node, label) {
+            let labelInside = false;
+            let sentinelNodeType;
+
+            if (node.type === "BreakStatement" && !node.label) {
+                sentinelNodeType = SENTINEL_NODE_TYPE_BREAK;
+            } else if (node.type === "ContinueStatement") {
+                sentinelNodeType = SENTINEL_NODE_TYPE_CONTINUE;
+            } else {
+                sentinelNodeType = SENTINEL_NODE_TYPE_RETURN_THROW;
+            }
+
+            for (
+                let currentNode = node;
+                currentNode && !sentinelNodeType.test(currentNode.type);
+                currentNode = currentNode.parent
+            ) {
+                if (currentNode.parent.label && label && (currentNode.parent.label.name === label.name)) {
+                    labelInside = true;
+                }
+                if (isFinallyBlock(currentNode)) {
+                    if (label && labelInside) {
+                        return false;
+                    }
+                    return true;
+                }
+            }
+            return false;
+        }
+
+        /**
+         * Checks whether the possibly-unsafe statement is inside a finally block.
+         * @param {ASTNode} node node to check.
+         * @returns {void}
+         */
+        function check(node) {
+            if (isInFinallyBlock(node, node.label)) {
+                context.report({
+                    messageId: "unsafeUsage",
+                    data: {
+                        nodeType: node.type
+                    },
+                    node,
+                    line: node.loc.line,
+                    column: node.loc.column
+                });
+            }
+        }
+
+        return {
+            ReturnStatement: check,
+            ThrowStatement: check,
+            BreakStatement: check,
+            ContinueStatement: check
+        };
+    }
+};