Method popToken

static/katex/katex.mjs:13882–13886

* Remove and return the next unexpanded token.

()

  popToken() {
    this.future(); // ensure non-empty stack

    return this.stack.pop();
  }
  /**
   * Add a given token to the token stack.  In particular, this get be used
   * to put back a token returned from one of the other methods.