The code imports various modules and functions, including a utility function to parse version numbers, and defines a nodeKernel function that uses the imported modules to create a Node.js kernel. The nodeKernel function is then exported as a module, making it available for use in other parts of the application.

Run example

npm run import -- "node wire kernel"

node wire kernel

var importer = require('../Core');
var {nodeJson, notebookJson} = importer.import("get kernel json");
var {wireKernel} = importer.import("jupyter wire kernel");
var {nativeKernelInfo} = importer.import("get kernel info");
var {processMetaKernel} = importer.import("process meta kernel");
var {languageInterface} = importer.import("get kernel language");

function getVersion(str) {
    return str.split('.').map(v => parseInt(v, 10)).join('.')
}

function nodeKernel(config, options) {
    return wireKernel({
        kernel_config: config,
        start_config: options,
        install_config: notebookJson,
        kernel_info: {
            banner: 'Node JS',
            // TODO: automatically create this from installation intructions
            help_links: ['https://nodejs.org']
        },
        language_info: {
            name: 'node',
            file_extension: '.js',
            mimetype: 'application/javascript',
            version: getVersion(process.versions.node),
            codemirror_mode: 'javascript'
        },
        child_process: [],
    });
}

module.exports = nodeKernel;

const { importModules } = require('../Core');

const { nodeJson, notebookJson } = importModules('get kernel json');
const { wireKernel } = importModules('jupyter wire kernel');
const { nativeKernelInfo } = importModules('get kernel info');
const { processMetaKernel } = importModules('process meta kernel');
const { languageInterface } = importModules('get kernel language');

/**
 * Extracts the version from a string in the format'major.minor.patch'
 * @param {string} str - The version string
 * @returns {string} The version in the format'major.minor.patch'
 */
function getVersion(str) {
  const versionParts = str.split('.');
  const version = versionParts.map((part) => parseInt(part, 10));
  return version.join('.');
}

/**
 * Creates a Node.js kernel configuration
 * @param {object} config - The kernel configuration
 * @param {object} options - The start configuration
 * @returns {object} The Node.js kernel configuration
 */
function nodeKernel(config, options) {
  const languageInfo = {
    name: 'node',
    fileExtension: '.js',
    mimetype: 'application/javascript',
    version: getVersion(process.versions.node),
    codemirrorMode: 'javascript',
  };

  const kernelInfo = {
    banner: 'Node JS',
    helpLinks: ['https://nodejs.org'], // TODO: automatically create this from installation instructions
  };

  return wireKernel({
    kernelConfig: config,
    startConfig: options,
    installConfig: notebookJson,
    kernelInfo,
    languageInfo,
    childProcess: [],
  });
}

module.exports = nodeKernel;

Code Breakdown

Importing Modules

var importer = require('../Core');
var {nodeJson, notebookJson} = importer.import('get kernel json');
var {wireKernel} = importer.import('jupyter wire kernel');
var {nativeKernelInfo} = importer.import('get kernel info');
var {processMetaKernel} = importer.import('process meta kernel');
var {languageInterface} = importer.import('get kernel language');

• The code imports modules from a Core module using the require function.
• It then imports specific functions or variables from these modules using the import method.

Utility Function

function getVersion(str) {
    return str.split('.').map(v => parseInt(v, 10)).join('.');
}

• This function takes a string representing a version number (e.g. "1.2.3") and returns a string with the same version number.
• It splits the input string into an array of integers, converts each integer to an integer, and then joins them back together with '.' as the separator.

nodeKernel Function

function nodeKernel(config, options) {
    return wireKernel({
        kernel_config: config,
        start_config: options,
        install_config: notebookJson,
        kernel_info: {
            banner: 'Node JS',
            help_links: ['https://nodejs.org']
        },
        language_info: {
            name: 'node',
            file_extension: '.js',
            mimetype: 'application/javascript',
            version: getVersion(process.versions.node),
            codemirror_mode: 'javascript'
        },
        child_process: [],
    });
}

• This function takes two arguments: config and options.
• It calls the wireKernel function with an object containing several properties.
• These properties include:
  • kernel_config: the config argument.
  • start_config: the options argument.
  • install_config: an imported notebookJson object.
  • kernel_info: an object containing information about the kernel, including a banner and help links.
  • language_info: an object containing information about the language, including its name, file extension, mimetype, and version (which is determined by calling the getVersion function).
  • child_process: an empty array.

Exporting the nodeKernel Function

module.exports = nodeKernel;

• The nodeKernel function is exported as a module, making it available for use in other parts of the application.