fix(options): add `writeToDisk` option to schema (#1520) · webpack/webpack-dev-server@d2f4902

Original file line number	Diff line number	Diff line change
`@@ -54,6 +54,16 @@`
`54`	`54`	`"watchOptions": {`
`55`	`55`	`"type": "object"`
`56`	`56`	`},`
	`57`	`+"writeToDisk": {`
	`58`	`+"anyOf": [`
	`59`	`+ {`
	`60`	`+"type": "boolean"`
	`61`	`+ },`
	`62`	`+ {`
	`63`	`+"instanceof": "Function"`
	`64`	`+ }`
	`65`	`+ ]`
	`66`	`+ },`
`57`	`67`	`"headers": {`
`58`	`68`	`"type": "object"`
`59`	`69`	`},`
`@@ -312,6 +322,7 @@`
`312`	`322`	`"port": "should be {String\|Number} (https://webpack.js.org/configuration/dev-server/#devserver-port)",`
`313`	`323`	`"socket": "should be {String} (https://webpack.js.org/configuration/dev-server/#devserver-socket)",`
`314`	`324`	`"watchOptions": "should be {Object} (https://webpack.js.org/configuration/dev-server/#devserver-watchoptions)",`
	`325`	`+"writeToDisk": "should be {Boolean\|Function} (https://github.com/webpack/webpack-dev-middleware#writetodisk)",`
`315`	`326`	`"headers": "should be {Object} (https://webpack.js.org/configuration/dev-server/#devserver-headers-)",`
`316`	`327`	`"clientLogLevel": "should be {String} and equal to one of the allowed values\n\n [ 'trace', 'debug', 'info', 'warn', 'error', 'silent' ]\n\n(https://webpack.js.org/configuration/dev-server/#devserver-clientloglevel)",`
`317`	`328`	`"overlay": "should be {Object\|Boolean} (https://webpack.js.org/configuration/dev-server/#devserver-overlay)",`