@atlaskit/editor-common/dist/types-ts4.5/types/block-type.d.ts

A package that contains common classes and components for editor and renderer

export type HeadingLevels = 1 | 2 | 3 | 4 | 5 | 6;
export type NormalTextLevel = 0;
export type HeadingLevelsAndNormalText = HeadingLevels | NormalTextLevel;
export type AllowedBlockTypes = 'heading' | 'blockquote' | 'hardBreak' | 'codeBlock';