Module(vfs): throws an error when the file content is empty string

[Grapedge]

@typescript/vfs

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

;(async () => {
  const compilerOptions = {
    target: ScriptTarget.ES2015,
  }
  const fsMap = await createDefaultMapFromCDN(compilerOptions, ts.version, true, ts)
  fsMap.set('index.ts', '') // error
  const system = createSystem(fsMap)
  const env = createVirtualTypeScriptEnvironment(system, ['index.ts'], ts, compilerOptions)
})()

Error:

Uncaught (in promise) Error: error TS6053: File 'index.ts' not found.
  The file is in the program because:
    Root file specified for compilation

    at Module.createVirtualTypeScriptEnvironment (index.ts:58:11)

It may be because of this:

// "@typescript/vfs" line 553:
    getScriptSnapshot: fileName => {
      const contents = sys.readFile(fileName)
      if (contents) { // <=
        return ts.ScriptSnapshot.fromString(contents)
      }
      return
    },

[orta]

Yeah, makes sense, I'd +1 a PR which changes that if(contents) to be one that checks for nulls & undefineds instead

[typescript-bot]

Hello! As per #2804, we are automatically closing all open issues. Please see #2804 for a description of what issues and PRs can be accepted going forward.