# E0034: redeclaration of variable

In a given function or `{}` block, a variable can only be declared multiple times if it is declared with `var` or `function`. Other types of variables can be declared only once:

    let x, y, y, w;

    const friends = loadFriends();
    const friends = friends
      .filter(friend => friend.name !== "strager");

    class Orange { name = "orange" }
    class Orange { name = "banana" }

    function jump(player, height) {
      let height = height || player.height/2;
    }

To fix this error, assign to the existing variable, choose a different variable name, or delete the extra variable:

    let x, y, z, w;

    let friends = loadFriends();
    friends = friends
      .filter(friend => friend.name !== "strager");

    class Orange { name = "orange" }
    class Banana { name = "banana" }

    function jump(player, height) {
      height = height || player.height/2;
    }

Introduced in quick-lint-js version 0.2.0.

Documentation for other errors