Found the usage of undeclared variables JS-0125
Bug risk
5 months ago
—
5 months old
'define' is not defined
5558 return null == e ? "" : (e + "").replace(Xt, "");
5559 }),
5560 "function" == typeof define &&
5561 define.amd && 5562 define("jquery", [], function () {
5563 return S;
5564 });'define' is not defined
5559 }),
5560 "function" == typeof define &&
5561 define.amd &&
5562 define("jquery", [], function () { 5563 return S;
5564 });
5565 var Vt = C.jQuery,'define' is not defined
5636 if (typeof exports == "object") {
5637 // For Node.js.
5638 module.exports = factory(root);
5639 } else if (typeof define == "function" && define.amd) { 5640 // For AMD. Register as an anonymous module.
5641 define([], factory.bind(root, root));
5642 } else {'define' is not defined
5638 module.exports = factory(root);
5639 } else if (typeof define == "function" && define.amd) {
5640 // For AMD. Register as an anonymous module.
5641 define([], factory.bind(root, root)); 5642 } else {
5643 // For browser globals (not exposing the function separately).
5644 factory(root);'define' is not defined
5817 "use strict";
5818 if (typeof exports === "object" && typeof exports.nodeName !== "string") {
5819 e(require("jquery"));
5820 } else if (typeof define === "function" && define.amd) { 5821 define(["jquery"], e);
5822 } else {
5823 e(jQuery);
Description
Variables that aren't defined, but accessed may throw reference errors at runtime.
Potential ReferenceErrors may result from misspellings of variable and parameter names, or accidental implicit globals (for example, forgetting the var keyword in a for loop initializer).
Any reference to an undeclared variable causes a warning, unless the variable is explicitly mentioned in a /*global ...*/ comment, or specified in the globals key in the configuration file.
A common use case for these is if you intentionally use globals that are defined elsewhere (e.g. in a script sourced from HTML).
Bad Practice
const foo = someFunction();
const bar = a + 1; // 'a' is undeclared
Recommended
/*global someFunction, a*/
/*eslint no-undef: "error"*/
const foo = someFunction();
const bar = a + 1;