Method backUp

typings/codemirror/codemirror.d.ts:1000–1000

* Backs up the stream n characters. Backing it up further than the start of the current token will cause things to * break, so be careful.

(n: number)

         * break, so be careful.
         */
        backUp(n: number): void;

        /**
         * Returns the column (taking into account tabs) at which the current token starts.