chore(deps-dev): bump esbuild from 0.14.1 to 0.20.0 (#505)

* chore(deps-dev): bump esbuild from 0.14.1 to 0.20.0

Bumps [esbuild](https://github.com/evanw/esbuild) from 0.14.1 to 0.20.0.
- [Release notes](https://github.com/evanw/esbuild/releases)
- [Changelog](https://github.com/evanw/esbuild/blob/main/CHANGELOG-2021.md)
- [Commits](evanw/esbuild@v0.14.1...v0.20.0)

---
updated-dependencies:
- dependency-name: esbuild
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

* Deal with new esbuild watch-mode

* Enable `skipLibCheck` in tsconfig.scripts.json to prevent type errors

```
node_modules/esbuild/lib/main.d.ts(643,22): error TS2304: Cannot find name 'URL'.
node_modules/esbuild/lib/main.d.ts(653,16): error TS2503: Cannot find namespace 'WebAssembly'.
```

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Masafumi Koba <473530+ybiquitous@users.noreply.github.com>