error: unknown option `--assetExts'Metro Bundler process exited with code 1
Error: Metro Bundler process exited with code 1
    at ChildProcess.packagerProcess.once (/@expo/xdl@57.9.20/src/Project.ts:1857:16)
    at Object.onceWrapper (events.js:286:20)
    at ChildProcess.emit (events.js:198:13)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:248:12)
error Command failed with exit code 1.
info Visit <https://yarnpkg.com/en/docs/cli/run> for documentation about this command.

このエラーが出た

"packagerOpts": {
	"assetExts": [
	  "html"
	]
},

これ削った