n8n/packages/@n8n_io/eslint-config/local-rules.js

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'use strict';
/**
* This file contains any locally defined ESLint rules. They are picked up by
* eslint-plugin-n8n-local-rules and exposed as 'n8n-local-rules/<rule-name>'.
*/
module.exports = {
/**
* A rule to detect calls to JSON.parse() that are not wrapped inside try/catch blocks.
*
* Valid:
* ```js
* try { JSON.parse(foo) } catch(err) { baz() }
* ```
*
* Invalid:
* ```js
* JSON.parse(foo)
* ```
*
* The pattern where an object is cloned with JSON.parse(JSON.stringify()) is allowed
* (abundant in the n8n codebase):
*
* Valid:
* ```js
* JSON.parse(JSON.stringify(foo))
* ```
*/
'no-uncaught-json-parse': {
meta: {
type: 'problem',
docs: {
description: 'Calls to JSON.parse() must be surrounded with a try/catch block.',
recommended: 'error',
},
schema: [],
messages: {
noUncaughtJsonParse: 'Surround the JSON.parse() call with a try/catch block.',
},
},
defaultOptions: [],
create(context) {
return {
CallExpression(node) {
if (!isJsonParseCall(node)) {
return;
}
if (isDeepCloneOperation(node)) {
return;
}
if (context.getAncestors().find((node) => node.type === 'TryStatement') !== undefined) {
return;
}
// Found a JSON.parse() call not wrapped into a try/catch, so report it
context.report({
messageId: 'noUncaughtJsonParse',
node,
});
},
};
},
},
};
const isJsonParseCall = (node) =>
node.callee.type === 'MemberExpression' &&
node.callee.object.type === 'Identifier' &&
node.callee.object.name === 'JSON' &&
node.callee.property.type === 'Identifier' &&
node.callee.property.name === 'parse';
const isDeepCloneOperation = (node) => {
const parseArg = node.arguments?.[0];
return (
parseArg !== undefined &&
parseArg.type === 'CallExpression' &&
parseArg.callee.type === 'MemberExpression' &&
parseArg.callee.object.type === 'Identifier' &&
parseArg.callee.object.name === 'JSON' &&
parseArg.callee.property.type === 'Identifier' &&
parseArg.callee.property.name === 'stringify'
);
};