Function createVirtualCompilerHost

createVirtualCompilerHost(
options: VirtualFileSystemOptions,
): VirtualCompilerHost
Creates a TypeScript compiler host that uses a virtual filesystem
Parameters
- options: VirtualFileSystemOptions
  Configuration options for the virtual filesystem
Returns VirtualCompilerHost
A compiler host that uses a virtual filesystem
Remarks
This function creates a compiler host that uses memfs for file operations instead of the real filesystem. This is particularly useful for:
- Testing TypeScript compilation without touching the disk
- Running TypeScript compilation in environments without filesystem access
- Isolating compilation processes from each other
The created host implements all required CompilerHost methods using the virtual filesystem, including file reading/writing, directory operations, and path resolution.
Link
https://www.typescriptlang.org/dev/typescript-vfs/
Example
```
const host = createVirtualCompilerHost({
  files: {
    '/src/component.ts': 'export class MyComponent extends HTMLElement {}'
  }
});

const program = ts.createProgram(['/src/component.ts'], {
  target: ts.ScriptTarget.ES2015
}, host);
```
- Defined in src/virtual-fs.ts:69