next.js/examples/cms-payload/payload/fields/richText/index.ts

import {
  RichTextElement,
  RichTextField,
  RichTextLeaf,
} from "payload/dist/fields/config/types";
import deepMerge from "../../utilities/deepMerge";
import elements from "./elements";
import leaves from "./leaves";

type RichText = (
  overrides?: Partial<RichTextField>,
  additions?: {
    elements?: RichTextElement[];
    leaves?: RichTextLeaf[];
  },
) => RichTextField;

const richText: RichText = (
  overrides,
  additions = {
    elements: [],
    leaves: [],
  },
) =>
  deepMerge<RichTextField, Partial<RichTextField>>(
    {
      name: "richText",
      type: "richText",
      required: true,
      admin: {
        elements: [...elements, ...(additions.elements || [])],
        leaves: [...leaves, ...(additions.leaves || [])],
      },
    },
    overrides || {},
  );

export default richText;