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Rosanny Sihombing authoredcea2f272
/** * @fileoverview Rule to flag use of implied eval via setTimeout and setInterval * @author James Allardice */"use strict";//------------------------------------------------------------------------------// Requirements//------------------------------------------------------------------------------const astUtils = require("./utils/ast-utils");const { getStaticValue } = require("eslint-utils");//------------------------------------------------------------------------------// Rule Definition//------------------------------------------------------------------------------module.exports = { meta: { type: "suggestion", docs: { description: "disallow the use of `eval()`-like methods", category: "Best Practices", recommended: false, url: "https://eslint.org/docs/rules/no-implied-eval" }, schema: [], messages: { impliedEval: "Implied eval. Consider passing a function instead of a string." } }, create(context) { const GLOBAL_CANDIDATES = Object.freeze(["global", "window", "globalThis"]); const EVAL_LIKE_FUNC_PATTERN = /^(?:set(?:Interval|Timeout)|execScript)$/u; /** * Checks whether a node is evaluated as a string or not. * @param {ASTNode} node A node to check. * @returns {boolean} True if the node is evaluated as a string. */ function isEvaluatedString(node) { if ( (node.type === "Literal" && typeof node.value === "string") || node.type === "TemplateLiteral" ) { return true; } if (node.type === "BinaryExpression" && node.operator === "+") { return isEvaluatedString(node.left) || isEvaluatedString(node.right); } return false; } /** * Reports if the `CallExpression` node has evaluated argument. * @param {ASTNode} node A CallExpression to check. * @returns {void} */ function reportImpliedEvalCallExpression(node) { const [firstArgument] = node.arguments; if (firstArgument) { const staticValue = getStaticValue(firstArgument, context.getScope()); const isStaticString = staticValue && typeof staticValue.value === "string";
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const isString = isStaticString || isEvaluatedString(firstArgument);
if (isString) {
context.report({
node,
messageId: "impliedEval"
});
}
}
}
/**
* Reports calls of `implied eval` via the global references.
* @param {Variable} globalVar A global variable to check.
* @returns {void}
*/
function reportImpliedEvalViaGlobal(globalVar) {
const { references, name } = globalVar;
references.forEach(ref => {
const identifier = ref.identifier;
let node = identifier.parent;
while (astUtils.isSpecificMemberAccess(node, null, name)) {
node = node.parent;
}
if (astUtils.isSpecificMemberAccess(node, null, EVAL_LIKE_FUNC_PATTERN)) {
const calleeNode = node.parent.type === "ChainExpression" ? node.parent : node;
const parent = calleeNode.parent;
if (parent.type === "CallExpression" && parent.callee === calleeNode) {
reportImpliedEvalCallExpression(parent);
}
}
});
}
//--------------------------------------------------------------------------
// Public
//--------------------------------------------------------------------------
return {
CallExpression(node) {
if (astUtils.isSpecificId(node.callee, EVAL_LIKE_FUNC_PATTERN)) {
reportImpliedEvalCallExpression(node);
}
},
"Program:exit"() {
const globalScope = context.getScope();
GLOBAL_CANDIDATES
.map(candidate => astUtils.getVariableByName(globalScope, candidate))
.filter(globalVar => !!globalVar && globalVar.defs.length === 0)
.forEach(reportImpliedEvalViaGlobal);
}
};
}
};