Function heading

Returns
    | Extract<RawPageBlockUnsupported, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockTitle, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockSubtitle, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockAuthorDate, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockHeader, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockSubheader, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockParagraph, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockPreformatted, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockFooter, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockDivider, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockAnchor, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockList, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockBlockquote, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockPullquote, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockPhoto, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockVideo, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockCover, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockEmbed, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockEmbedPost, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockCollage, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockSlideshow, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockChannel, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockAudio, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockKicker, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockTable, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockOrderedList, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockDetails, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockRelatedArticles, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockMap, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockHeading1, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockHeading2, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockHeading3, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockHeading4, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockHeading5, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockHeading6, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockMath, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockThinking, { _: `pageBlockHeading${Level}` }>
    | Extract<RawInputPageBlockMap, { _: `pageBlockHeading${Level}` }>
    | Extract<RawPageBlockBlockquoteBlocks, { _: `pageBlockHeading${Level}` }>