CRITICAL: createFile from createVirtualTypeScriptEnvironment does not create a file detectable by it's own updateFile

[maki-q]

Page URL: https://github.com/microsoft/TypeScript-Website/blob/v2/packages/typescript-vfs/src/index.ts#L72

Issue: When calling updateFile on a newly created file, an error is thrown, stating Error: Did not find a source file for X. I believe the internal fs mapping does not get updated with the newly created files.

Here's an example:

    import {
        createDefaultMapFromCDN,
        createSystem,
        createVirtualTypeScriptEnvironment
    } from '@typescript/vfs';
    import ts from 'typescript';

    const compilerOpts = {
        target: ts.ScriptTarget.ES2021,
        module: ts.ScriptTarget.ES2020,
        lib: ['es2021', 'es2020', 'dom', 'webworker'],
        esModuleInterop: true
    };

    const fsMap = await createDefaultMapFromCDN(
        compilerOpts,
        ts.version,
        false,
        ts
    );
    const ENTRY_POINT = 'index.ts';
    fsMap.set(ENTRY_POINT, 'Hello World');

    const system = createSystem(fsMap);
    const env = createVirtualTypeScriptEnvironment(
        system,
        [ENTRY_POINT],
        ts,
        compilerOpts
    );

    env.createFile('test.js', 'test')
    env.updateFile('test.js', 'hello world') // throws error