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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 }; } };