Error when running build after bootstrap

Hi,

I'm getting the following error. I just cloned and following the instructions.

## Repro Steps
1. Do a fresh git clone
2. `cd libav.wasm`
3. Run `npx lerna run bootstrap` (Finishes successfully)
4. Run `npx lerna run build`
5. Result: See error below

## Error
```bash
francoislaberge@Francoiss-MBP libav.wasm % npx lerna run build
lerna notice cli v6.0.3

> @ffmpeg/libav:build

> @ffmpeg/libav@0.0.1-alpha.0 build
> rimraf dist && tsc
src/libav.ts(1,30): error TS2307: Cannot find module 'ffmpeg__libav-core' or its corresponding type declarations.
npm ERR! Lifecycle script `build` failed with error:
npm ERR! Error: command failed
npm ERR! in workspace: @ffmpeg/libav@0.0.1-alpha.0
npm ERR! at location: /Users/francoislaberge/dev/libav.wasm/packages/libav

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> Lerna (powered by Nx) Ran target build for project @ffmpeg/libav (872ms)

✖ 1/1 failed
✔ 0/1 succeeded [0 read from cache]

```

## My environment:
```
macOS Monterey, Version 12.3
Macbook Pro M1 Pro

Docker Version: 4.14.0 (91374)
Docker Engine: 20.10.21
Docker Compose: v2.12.2
Docker Credential Helper: v0.7.0
Docker Kubernetes: v1.25.2
Docker Snyk: v1.1025.0
```

Any idea what I'm doing wrong?