Is this how LET should work?

let.js

let a = 0;
{
  console.log(a);  //Node throws error cause "a" isn`t defined yet, but it was defined on line one. 
  let a = 1;
  console.log(a);
}
console.log(a);

Read it like this:

// In outer scope, an `a` binding is created.
let a = 0;
{
  // Block is entered 
  // All declarations are collected, and an inner `a` binding is created, which will shadow the outer `a`. 
  // The inner `a` TDZ begins now.
  // The [[Get]] on `a` throws because it's before the declaration
  console.log(a);
  // The `a` binding is "officially" declared and given an assignment, 
  // use of the binding in this block is totally ok now
  let a = 1;
  console.log(a);
}
console.log(a);