Fetch code is missing

[kanedaki]

trafficstars

I was reading the docs here https://developers.google.com/web/fundamentals/codelabs/offline/ (spanish) when I realized there is no code for the fetch interceptor

Agrega el siguiente código al final de tu sw.js para registrar las solicitudes hechos desde la página principal.

... but there is no code

[fmagrosoto]

I have the same issue. The code is lost in translation.