editor/source/react-mde/src/commands/checkListCommand.tsx

import * as React from "react";
import {Command} from "../types";
import {makeList} from "../util/MarkdownUtil";
import {buildNewDraftState, getMarkdownStateFromDraftState} from "../util/DraftUtil";

export const checkListCommand: Command = {
    buttonContentBuilder: ({ iconProvider }) => iconProvider("tasks"),

    buttonProps: { "aria-label": "Insert checklist" },

    execute: (state) => {
        let mdState = getMarkdownStateFromDraftState(state);
        mdState = makeList(mdState, "- [ ] ");
        return buildNewDraftState(state, mdState);
    },
};