Cannot redeclare block-scoped variable ‘lia’

Cannot redeclare block-scoped variable ‘lia’

If you are seeing the error message “Cannot redeclare block-scoped variable ‘lia’” in your TypeScript code, don’t worry, you’re not alone. This error occurs when you try to declare a variable with the same name within the same block scope. TypeScript enforces block-scoping rules to prevent variable name collisions and maintain code clarity.

There are a few ways to resolve this error:

1. Rename the variable

The simplest solution is to rename one of the variables to avoid the name collision. By giving each variable a unique name, you can eliminate the error. Here’s an example:

let lia = 10;
let otherLia = 20;
console.log(lia + otherLia); // Output: 30

2. Use different block scopes

If you need to use the same variable name within different block scopes, you can do so without any issues. This approach allows you to have separate variables with the same name in different blocks. Here’s an example:

{
  let lia = 10;
  console.log(lia); // Output: 10
}

{
  let lia = 20;
  console.log(lia); // Output: 20
}

3. Use a different variable declaration keyword

If you need to declare a variable with the same name in the same block scope, you can use a different variable declaration keyword to avoid the error. For example, you can use const or var instead of let. Here’s an example:

let lia = 10;
const lia = 20; // No error
console.log(lia); // Output: 20

By using one of these solutions, you can resolve the “Cannot redeclare block-scoped variable ‘lia’” error in your TypeScript code. Remember to choose the solution that best fits your specific use case.

Happy coding!