add changeset

.changeset/thirty-birds-build.md

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+---
+'@cloudflare/next-on-pages': patch
+---
+
+fix: implement route specific global scoping strategy
+
+currently routes all share the same global scope, this can be problematic and cause
+race conditions and failures
+
+One example of this is the following code that is present in route function files:
+
+```ts
+self.webpackChunk_N_E = ...
+```
+
+and
+
+```ts
+self.webpackChunk_N_E.push(...)
+```
+
+this indicates that an in-memory global collection of the webpack chunks is shared by all routes,
+this combined with the fact that chunks can have their own module state this can easily cause routes
+to conflict with each other at runtime.
+
+So, in order to solve the above issue wrap every route function in a function wrapper which
+accepts as parameters, thus overrides, the `self`, `globalThis` and `global` symbols. The symbols
+are then to be resolved with proxies that redirect setters to route-scoped in-memory maps and
+getters to the above mentioned map's values and fallback to the original symbol values otherwise
+(i.e. `globalThis` will be overridden by a proxy that, when setting values, sets them in a separate
+location and, when getting values, gets them from said location if present there or from the real
+`globalThis` otherwise)