SyntaxError: 'arguments'/'eval' can't be defined or assigned to in strict mode code
The JavaScript strict mode-only exception "'arguments' can't be defined or assigned to in strict mode code" or "'eval' can't be defined or assigned to in strict mode code" occurs when attempting to create a binding called arguments or eval, or assign to such a name.
Message
SyntaxError: Unexpected eval or arguments in strict mode (V8-based) SyntaxError: 'arguments' can't be defined or assigned to in strict mode code (Firefox) SyntaxError: Cannot modify 'arguments' in strict mode. (Safari) SyntaxError: Cannot destructure to a parameter name 'arguments' in strict mode. (Safari) SyntaxError: Cannot declare a variable named arguments in strict mode. (Safari) SyntaxError: Cannot declare a catch variable named 'arguments' in strict mode. (Safari) SyntaxError: 'arguments' is not a valid function name in strict mode. (Safari)
Error type
What went wrong?
In strict mode, the names arguments and eval behave as if they are reserved words: you cannot make they refer to anything other than the arguments object in functions or the global eval function.
Examples
Invalid cases
js
"use strict"; const arguments = [1, 2, 3]; console.log(Math.max(...arguments)); function foo(...arguments) { console.log(arguments); } Valid cases
js
"use strict"; const args = [1, 2, 3]; console.log(Math.max(...args)); function foo(...args) { console.log(args); } 