yarn install error

[0xspade]

yarn command already has an issue:

$ yarn
yarn install v1.22.19
[1/4] Resolving packages...
[2/4] Fetching packages...
error react-router-dom@6.8.1: The engine "node" is incompatible with this module. Expected version ">=14". Got "12.22.12"
error Found incompatible module.
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.

however, with --ignore-engines the error will go away

$ yarn install --ignore-engines
yarn install v1.22.19
[1/4] Resolving packages...
[2/4] Fetching packages...
[3/4] Linking dependencies...
warning " > @parcel/config-webextension@2.8.3" has unmet peer dependency "@parcel/core@^2.8.3".
warning "@parcel/config-webextension > @parcel/config-default@2.8.3" has unmet peer dependency "@parcel/core@^2.8.3".
warning "@parcel/config-webextension > @parcel/config-default > @parcel/transformer-image@2.8.3" has unmet peer dependency "@parcel/core@^2.8.3".
warning "@parcel/config-webextension > @parcel/config-default > @parcel/transformer-js@2.8.3" has unmet peer dependency "@parcel/core@^2.8.3".
[4/4] Building fresh packages...
Done in 2.13s.

and then, yarn start has an error:

$yarn start
yarn run v1.22.19
$ parcel watch src/manifest.json --host localhost --config @parcel/config-webextension --no-content-hash --no-cache
🚨 Build failed.

@parcel/transformer-postcss: Unexpected token '.'

 [REDACTED]/spy-extension/node_modules/postcss-import/index.js:47
        if (styles.source?.input?.file) {
                          ^
  
  SyntaxError: Unexpected token '.'
      at wrapSafe (internal/modules/cjs/loader.js:915:16)
      at Module._compile (internal/modules/cjs/loader.js:963:27)
      at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10)
      at Module.load (internal/modules/cjs/loader.js:863:32)
      at NodePackageManager.load ([REDACTED]/spy-extension/node_modules/@parcel/package-manager/lib/index.js:3375:15)
      at NodePackageManager.require ([REDACTED]/spy-extension/node_modules/@parcel/package-manager/lib/index.js:3349:21)
      at async loadPlugin ([REDACTED]/spy-extension/node_modules/@parcel/transformer-postcss/lib/loadPlugins.js:24:16)
      at async Promise.all (index 0)
      at async loadExternalPlugins ([REDACTED]/spy-extension/node_modules/@parcel/transformer-postcss/lib/loadPlugins.js:12:22)
      at async configHydrator ([REDACTED]/spy-extension/node_modules/@parcel/transformer-postcss/lib/loadConfig.js:82:17)