[RFC] lingui t macro demonstrate

[rwu823]

Hi @thekip,

Could you help take a look at this and if there are any issues? It works well on both the server and client sides.

reference

lingui/js-lingui#1698

[timofei-iatsenko]

t is using a global i18n instance. Use it with a very big caution, especially in server setup.
The problem is that i18n singleton is "cached" on the module level (js modules feature) and shared between all your requests.

However, nodejs is processing requests from your users - concurrently, it means it can start processing another request while still waiting for some async operation of the first one. In this case, it may happen that global i18n instance would be switched to another language in the middle of processing first request.

So using global t in server side context has not obvious problems with delayed consequences.

[timofei-iatsenko]

The same is true for what you did for rsc trans file. Using global i18n instance will lead to the same problem as with t. In server context you always have to create a separate instance of i18n for every request, avoiding polluting from other users requests.

[rwu823]

@thekip Thanks for explaining. So, the purpose of using React.cache is to have a separate i18n instance for each request, right?

[timofei-iatsenko]

Exactly.