The title made me expect that the QR code would be generated with just 7 lines of vanilla javascript code. But it seems that the integration with slack is meant with the 7 lines of code.
So, "Integrate a QR code with slack in 7 lines of javascript" would seem more apt as a title.
I think it's interesting to consider that, increasingly, third-party APIs are becoming first-party tools. While your interpretation would also be correct, if the API is doing the generating [0], is that one line of code or "an integration"? What's the delineation between the two if the APIs behave as a native developer might expect a package to behave? Stripe famously launched with the "7 lines of code" tagline. :) [1]
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[ 3.2 ms ] story [ 16.0 ms ] threadSo, "Integrate a QR code with slack in 7 lines of javascript" would seem more apt as a title.
[0] https://autocode.com/lib/qrcode/generate/
[1] https://news.ycombinator.com/item?id=14902696
While I still kind of disagree with your title, I get where you are coming from now.