SyntaxError: Unexpected identifier after numeric literal (Edge)
SyntaxError: identifier starts immediately after numeric literal (Firefox)
SyntaxError: Unexpected number (Chrome)

The names of variables, called identifiers, conform to certain rules, which your code must adhere to!

A JavaScript identifier must start with a letter, underscore (_), or dollar sign ($). They can't start with a digit! Only subsequent characters can be digits (0-9).

Variable names can't start with numbers in JavaScript. The following fails:

const 1life = "foo";
// SyntaxError: identifier starts immediately after numeric literal

const foo = 1life;
// SyntaxError: identifier starts immediately after numeric literal

alert(1.foo);
// SyntaxError: identifier starts immediately after numeric literal

You will need to rename your variable to avoid the leading number.

const life1 = "foo";
const foo = life1;

• Lexical grammar
• Grammar and types guide