orlowdev/gatsby-source-notion-api

const { getPages } = require("./src/notion-api/get-pages")
const { notionBlockToMarkdown } = require("./src/transformers/notion-block-to-markdown")
const { getNotionPageProperties } = require("./src/transformers/get-page-properties")
const { getNotionPageTitle } = require("./src/transformers/get-page-title")
const YAML = require("yaml")

const NOTION_NODE_TYPE = "Notion"

exports.sourceNodes = async (
    { actions, createContentDigest, createNodeId, reporter, cache },
    { token, databaseId, propsToFrontmatter = true, lowerTitleLevel = true },
) => {
    const pages = await getPages({ token, databaseId }, reporter, cache)

    pages.forEach((page) => {
        const title = getNotionPageTitle(page)
        const properties = getNotionPageProperties(page)
        let markdown = notionBlockToMarkdown(page, lowerTitleLevel)

        if (propsToFrontmatter) {
            const frontmatter = Object.keys(properties).reduce(
                (acc, key) => ({
                    ...acc,
                    [key]: properties[key].value.remoteImage || properties[key].value,
                }),
                { title },
            )

            markdown = "---\n".concat(YAML.stringify(frontmatter)).concat("\n---\n\n").concat(markdown)
        }

        actions.createNode({
            id: createNodeId(`${NOTION_NODE_TYPE}-${page.id}`),
            title,
            properties,
            archived: page.archived,
            createdAt: page.created_time,
            updatedAt: page.last_edited_time,
            markdownString: markdown,
            raw: page,
            json: JSON.stringify(page),
            parent: null,
            children: [],
            internal: {
                type: NOTION_NODE_TYPE,
                mediaType: "text/markdown",
                content: markdown,
                contentDigest: createContentDigest(page),
            },
        })
    })
}