nbtx/dist/minify/mime.js

Jupyter Notebook Translators: Transform Jupyter notebook JSON files (*.ipynb) to and from more compact data structures for use in web applications or other contexts where loading component parts (e.g. images, data, etc.) is preferred.

import { ensureString } from './utils.js';
function minifyContent(content, contentType, isBase64Image, outputCache, opts) {
    if (content.length === 0 || (!isBase64Image && content.length <= opts.maxCharacters)) {
        return { content, content_type: contentType };
    }
    let hash;
    if (isBase64Image) {
        const [data] = content.split(';base64,').reverse(); // reverse as sometimes there is no header
        hash = opts.computeHash(data);
        outputCache[hash] = [data, { contentType, encoding: 'base64' }];
    }
    else {
        hash = opts.computeHash(content);
        outputCache[hash] = [content, { contentType, encoding: 'utf8' }];
    }
    return {
        content_type: contentType,
        hash,
    };
}
export async function minifyMimeOutput(output, outputCache, opts) {
    const items = await Promise.all(Object.entries(output.data).map(async ([mimetype, mimeContent]) => {
        let isBase64Image = false;
        let stringContent = '';
        if (mimetype !== 'application/javascript' &&
            (mimetype === 'application/json' ||
                (mimetype.startsWith('application/') && typeof mimeContent === 'object'))) {
            stringContent = JSON.stringify(mimeContent);
        }
        else {
            stringContent = ensureString(mimeContent);
        }
        if (!mimetype.startsWith('image/svg') && mimetype.startsWith('image/')) {
            isBase64Image = true;
        }
        // NOTE we insist on creating stringified content as this can / will end up in a
        // database with limited support for nested objects. Stringifcaiton here means
        // an inverse operation is needed on convertToIOutputs to get back to the original
        return minifyContent(stringContent, mimetype, isBase64Image, outputCache, opts);
    }));
    const data = items.reduce((bundle, item) => ({ ...bundle, [item.content_type]: item }), {});
    return {
        output_type: output.output_type,
        execution_count: output.execution_count,
        metadata: output.metadata,
        data,
    };
}