This is an attempt to scaffold yarn workspaces into our repo with as minimal as
possible changes to our current setup and directory structure. Essentially this
PR moves current `src` into `packages/babel-plugin-react-forget` as a first step
to keep everything working. Later on when we're ready we can split out a
`react-compiler` package that is decoupled from Babel, but it's too early for
that now
---
(`react-forget-runtime` package seems to be synced to -.)
RFC: useRenderCounter hook:
- tracks # renders (increments on render path)
- exposes a global renderCounterRegistry (counting # renders in alive / mounted
components)
Next PR will modify BabelPlugin to add codegen
```js
// Similar to how we're currently importing `isForgetEnabled`
import {isInstrumentForgetEnabled_Secret} from "ReactForgetFeatureFlag";
// ...
function Component_uncompiled(props) {
if (isInstrumentForgetEnabled_Secret) {
useRenderCounter();
}
// ...
}
function Component_forget(props) {
if (isInstrumentForgetEnabled_Secret) {
useRenderCounter();
}
// ...
}
```
Some prior [microbenchmarking](https://jsbench.me/7ol98ws520/1) showed that a
for loop outperformed `fill` (which is about ~60% slower). This is the same
approach we use in the latest useMemoCache PR
This is a new module that holds:
- the `useMemoCache` stub (hopefully to be deleted next week)
- various helpers that can be imported by the compiler, e.g. the dispatcher
guard `$startLazy`
- skipped the implementation of `makeReadOnly` for now as there's already
multiple copies and I wanted to avoid typescript in this file for now to make
the build easier (i.e. no build)
Lauren Tan
Mofei Zhang
Joe Savona
Jan Kassens