parser

Marked version:
3.x.x

Describe the bug
A clear and concise description of what the bug is.

Right now, import {use} from "markedjs" does not work, this worked in 2.x.x.

To Reproduce
Steps to reproduce the behavior:

Install & import it.
The DefinitelyTyped definitions also mark this incorrectly as being supported still.

A workaround is importing one of the structur

When looking up an attribute with .attr(), the name of the attribute should be lowercased before looking up in .attribs object.

I'm struggling to understand what's wrong with this sample:

$ shfmt
@() {
    echo "$@"
}
@ hello world\!
<standard input>:3:1: "}" can only be used to close a block