Homelab, Linux, JS & ABAP (~˘▾˘)~

[nodejs] workspaces

If you have subdirectories or additional applications which have its own package.json file, you can add them via the workspaces setting to your main project.

  "name": "my-project",
  "workspaces": [ 

When running npm install it will now also install the dependencies of all projects in the app folder.

[JavaScript] Clone an object containing a file as ArrayBuffer

Use the build in function structuredClone() to copy all kind of complex JS types.

Official documentation: https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Structured_clone_algorithm#supported_types

Comparison to other copy techniques like spread or json.stringify: https://www.builder.io/blog/structured-clone

[nodejs] Node Version Manager (NVM)

# Install script: https://github.com/nvm-sh/nvm#install--update-script
curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.5/install.sh | bash

# check current used node version
node -v

# list local available node versions
nvm list

# list all released node versions
nvm ls-remote

# install specific node version and switch to it
nvm install v20.5.1

# switch to a specific node version, which is already installed
nvm use v20.5.1

[nodejs] Create buffer from stream

Using a promise

const stream2Buffer = async () => {
        return new Promise(function (resolve, reject) {
                const chunks = []
                stream.on('data', chunk => chunks.push(chunk))
                stream.on('end', () => resolve(Buffer.concat(chunks)))
                stream.on("error", err => reject(err))
const buffer = await stream2Buffer()

A stream is also iterable (see here), so you can also use for await...of (example)

        const chunks = []
        for await (const chunk of stream) {
        const buffer = Buffer.concat(chunks)

[PDF.js] Set filename when downloading pdf

When using a blob or base64 data to open a file in PDF.js, the viewer is not able to get the correct filename. So when downloading the pdf using the download button inside the viewer, it will always download as document.pdf. To manually set a filename, you can use the setTitleUsingUrl function.

<iframe id="pdf-js-viewer" src="/pdf/web/viewer.html?file=" title="webviewer" frameborder="0" width="100%" height="700" allowfullscreen="" webkitallowfullscreen=""/>
let pdfViewerIFrame = document.getElementById("pdf-js-viewer")

More info here: https://github.com/mozilla/pdf.js/issues/10435