@atlaskit/editor-core/dist/es5/renderer/text/index.d.ts

A package contains Atlassian editor core functionality

import { Fragment, Schema } from '../../prosemirror';
import { Serializer } from '../serializer';
export default class TextSerializer implements Serializer<string> {
    serializeFragment(fragment: Fragment): string;
    static fromSchema(schema: Schema<any, any>): TextSerializer;
}