plane/web/components/tiptap/extensions/index.tsx

import StarterKit from "@tiptap/starter-kit";
import HorizontalRule from "@tiptap/extension-horizontal-rule";
import TiptapLink from "@tiptap/extension-link";
import Placeholder from "@tiptap/extension-placeholder";
import TiptapUnderline from "@tiptap/extension-underline";
import TextStyle from "@tiptap/extension-text-style";
import { Color } from "@tiptap/extension-color";
import TaskItem from "@tiptap/extension-task-item";
import TaskList from "@tiptap/extension-task-list";
import { Markdown } from "tiptap-markdown";
import Highlight from "@tiptap/extension-highlight";
import CodeBlockLowlight from "@tiptap/extension-code-block-lowlight";
import { lowlight } from "lowlight/lib/core";
import SlashCommand from "../slash-command";
import { InputRule } from "@tiptap/core";
import Gapcursor from "@tiptap/extension-gapcursor";

import ts from "highlight.js/lib/languages/typescript";

import "highlight.js/styles/github-dark.css";
import UniqueID from "@tiptap-pro/extension-unique-id";
import UpdatedImage from "./updated-image";
import isValidHttpUrl from "../bubble-menu/utils/link-validator";
import { CustomTableCell } from "./table/table-cell";
import { Table } from "./table/table";
import { TableHeader } from "./table/table-header";
import { TableRow } from "@tiptap/extension-table-row";

lowlight.registerLanguage("ts", ts);

export const TiptapExtensions = (
  workspaceSlug: string,
  setIsSubmitting?: (isSubmitting: "submitting" | "submitted" | "saved") => void
) => [
    StarterKit.configure({
      bulletList: {
        HTMLAttributes: {
          class: "list-disc list-outside leading-3 -mt-2",
        },
      },
      orderedList: {
        HTMLAttributes: {
          class: "list-decimal list-outside leading-3 -mt-2",
        },
      },
      listItem: {
        HTMLAttributes: {
          class: "leading-normal -mb-2",
        },
      },
      blockquote: {
        HTMLAttributes: {
          class: "border-l-4 border-custom-border-300",
        },
      },
      code: {
        HTMLAttributes: {
          class:
            "rounded-md bg-custom-primary-30 mx-1 px-1 py-1 font-mono font-medium text-custom-text-1000",
          spellcheck: "false",
        },
      },
      codeBlock: false,
      horizontalRule: false,
      dropcursor: {
        color: "rgba(var(--color-text-100))",
        width: 2,
      },
      gapcursor: false,
    }),
    CodeBlockLowlight.configure({
      lowlight,
    }),
    HorizontalRule.extend({
      addInputRules() {
        return [
          new InputRule({
            find: /^(?:---|—-|___\s|\*\*\*\s)$/,
            handler: ({ state, range, commands }) => {
              commands.splitBlock();

              const attributes = {};
              const { tr } = state;
              const start = range.from;
              const end = range.to;
              // @ts-ignore
              tr.replaceWith(start - 1, end, this.type.create(attributes));
            },
          }),
        ];
      },
    }).configure({
      HTMLAttributes: {
        class: "mb-6 border-t border-custom-border-300",
      },
    }),
    Gapcursor,
    TiptapLink.configure({
      protocols: ["http", "https"],
      validate: (url) => isValidHttpUrl(url),
      HTMLAttributes: {
        class:
          "text-custom-primary-300 underline underline-offset-[3px] hover:text-custom-primary-500 transition-colors cursor-pointer",
      },
    }),
    UpdatedImage.configure({
      HTMLAttributes: {
        class: "rounded-lg border border-custom-border-300",
      },
    }),
    Placeholder.configure({
      placeholder: ({ node }) => {
        if (node.type.name === "heading") {
          return `Heading ${node.attrs.level}`;
        }
        if (node.type.name === "image" || node.type.name === "table") {
          return "";
        }

        return "Press '/' for commands...";
      },
      includeChildren: true,
    }),
    UniqueID.configure({
      types: ["image"],
    }),
    SlashCommand(workspaceSlug, setIsSubmitting),
    TiptapUnderline,
    TextStyle,
    Color,
    Highlight.configure({
      multicolor: true,
    }),
    TaskList.configure({
      HTMLAttributes: {
        class: "not-prose pl-2",
      },
    }),
    TaskItem.configure({
      HTMLAttributes: {
        class: "flex items-start my-4",
      },
      nested: true,
    }),
    Markdown.configure({
      html: true,
      transformCopiedText: true,
    }),
    Table,
    TableHeader,
    CustomTableCell,
    TableRow,
  ];