Fix pnpm start failing with ERROR #98123 (eslint-plugin-flowtype vs ESLint 8)

[lynusx]

Problem

Running pnpm start on a fresh clone fails while building the Gatsby
development bundle:

ERROR #98123 WEBPACK.DEVELOP
Failed to load plugin 'flowtype' declared in 'BaseConfig » eslint-config-react-app/index.js':
Package subpath './lib/rules/no-unused-expressions' is not defined by "exports"
in node_modules/eslint/package.json

`eslint-config-react-app@6` depends on `[email protected]`, which
loads ESLint's core `no-unused-expressions` rule via the deep import
`eslint/lib/rules/no-unused-expressions`. ESLint 8 blocks this path through the
`exports` field in its package.json, so the plugin fails to load.

Fix

Add a pnpm override pinning eslint-plugin-flowtype to 8.0.3, which resolves the built-in rule via eslint/use-at-your-own-risk on ESLint 8.

Verified locally: pnpm start now builds the development bundle successfully and the site is served on http://localhost:8000.

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