Support ESLint 8.x

[MichaelDeBoey]

ESLint v8.0.0 is released 🎉

It would be awesome to have official ESLint 8 support. 👊
I'm happy to help where I can of course 🙂

[EvHaus]

Looks like the plugin doesn't support it out-of-the-box. Trying to use it with eslint@8.0.1 gives me this:

ESLint: 8.0.1

Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './lib/rules/no-unused-expressions' is not defined by "exports" in /myproject/node_modules/eslint/package.json
    at throwExportsNotFound (internal/modules/esm/resolve.js:299:9)
    at packageExportsResolve (internal/modules/esm/resolve.js:522:3)
    at resolveExports (internal/modules/cjs/loader.js:449:36)
    at Function.Module._findPath (internal/modules/cjs/loader.js:489:31)
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:875:27)
    at Function.Module._load (internal/modules/cjs/loader.js:745:27)
    at Module.require (internal/modules/cjs/loader.js:961:19)
    at require (/myproject/node_modules/v8-compile-cache/v8-compile-cache.js:159:20)
    at Object.<anonymous> (/myproject/node_modules/eslint-plugin-flowtype/dist/rules/noUnusedExpressions.js:8:51)
    at Module._compile (/myproject/node_modules/v8-compile-cache/v8-compile-cache.js:192:30)

[MichaelDeBoey]

@EvHaus That's why I created #496 😉

[EvHaus]

Upgrading the eslint-plugin-flowtype@8.0.2 fixed my issue. Thank you!