Function isLexicalVariableProhibited

src/transform/let.js:202–215

(group)

//     if (true) { const x = 10; }
//
function isLexicalVariableProhibited(group) {
  const node = group.getNode();
  const parentNode = group.getParentNode();

  if (parentNode.type === 'IfStatement') {
    return parentNode.consequent === node || parentNode.alternate === node;
  }

  if (isAnyForStatement(parentNode) || isAnyWhileStatement(parentNode)) {
    return parentNode.body === node;
  }

  return false;
}

function logWarningForVarKind(node) {
  if (node.kind === 'var') {