PR Checklist

• Addresses an existing open issue:fixesDocs: Playground gets into "cannot find source file" error state if started with blank file and config contents #11342
• That issue was marked asaccepting prs
• Steps inContributing were taken

Overview

Sorry, I didn’t consider that case either.@JoshuaKGoldberg

WhenfileType doesn't exist in the URL hash, the following hook is executed:

typescript-eslint/packages/website/src/components/editor/LoadedEditor.tsx

Lines 93 to 110 indb32b8a

	useEffect(()=>{
	constnewPath=`/input${fileType}`;
	if(tabs.code.uri.path!==newPath){
	constcode=tabs.code.getValue();
	constnewModel=monaco.editor.createModel(
	code,
	undefined,
	monaco.Uri.file(newPath),
	);
	newModel.updateOptions({insertSpaces:true,tabSize:2});
	if(tabs.code.isAttachedToEditor()){
	editor.setModel(newModel);
	}
	tabs.code.dispose();
	tabs.code=newModel;
	system.writeFile(newPath,code);
	}
	},[fileType,editor,system,monaco,tabs]);

As a result,system.write is called.

After that, this code runs.

typescript-eslint/packages/website/src/components/linter/createParser.ts

Lines 49 to 51 indb32b8a

	if(system.fileExists(filePath)){
	compilerHost.updateFile(filePath,code);
	}else{

At this point,system has the file, butcompilerHost does not.

At the result "cannot find source file" error occur intypescript-website

 updateFile: (fileName, content, optPrevTextSpan) => {      const prevSourceFile = languageService.getProgram()!.getSourceFile(fileName)      if (!prevSourceFile) {        throw new Error("Did not find a source file for " + fileName)      }