Reuse Responses - Read From a Non-existing File

[bytrangle]

First off, thank you very much for putting up a great example for sharing responses from getStaticPaths to getStaticProps.

I have a question regarding the use of cache.get() method.

getStaticPaths only writes to cache at build time. However, in getStaticProps, you try to read from cache unconditionally. If the cache file doesn't exist, then fs.promises will throw an error "ENOENT No such file or directory at ...".

const getStaticPaths = async () => {
  const products = await api.list()

  if (process.env.NEXT_PHASE === PHASE_PRODUCTION_BUILD) {
    await api.cache.set(products)
  }
  // ...
}
const getStaticProps = async ({ params }) => {
  let product = await api.cache.get(params?.id as string)

  if (!product) {
    product = await api.fetch(params?.id as string)
  }
  // ...
}

For now, anyone trying out this demo won't get that error because you've added a placeholder file products.db.

Should we add a catch block to the cache.get() method? Or only read from cache if it is build time?

[goncy]

Hey @bytrangle, thanks for the comment! As this are just meant to be used as guidance we can assume that the file will always be there. Although I feel that adding a catch would make more sense, I prefer to leave it like this to give more focus on the example related code, but of course, if we see this happens to more people we can add it!