add start and end range of a node

[gre]

i was only able to locate the "start" via node.token.position, but figuring out the "end" is not trivial as far as I know

[gre]

actually here is a workaround

const tokens = tokenize(code);
const ast = parse(tokens);

function decoratePosition(node, end) {
  node.loc = {
    start: node.token.position || 0,
    end,
  };
  node.children.forEach((child, i) => {
    const nextSibling = node.children[i + 1];
    decoratePosition(
      child,
      nextSibling && nextSibling.token && 'position' in nextSibling.token
        ? nextSibling.token.position -
            (nextSibling.token.preceding || [])
              .reduce((s, n) => s + (n.data || '').length, 0)
        : end
    );
  });
}
decoratePosition(ast, code.length);