getDiagnostics throws when the filename does not have an extension

Simple:

const project = new Project();
const file = project.createSourceFile("no_extension", "const a: number = 0 as any as number");

console.log(file.getDiagnostics());

For stack trace check the details of the original issue below.

Original issue

Taking a stab at the silly #357, I'm getting an error.

Idea

function toString (type: string | Type): string {
  if (typeof type == 'string') {
    return type
  } else {
    return type.getText()
  }
}

export function isAssignable (project: Project, dst: string | Type, src: string | Type): boolean {
  const dstType = toString(dst)
  const srcType = toString(src)

  Error.stackTraceLimit = Infinity

  const content = `const a: ${dstType} = 0 as any as ${srcType}`
  const file = project.createSourceFile(FILENAME, content)
  console.log(content) // => const a: number = 0 as any as number
  const diagnostics = file.getDiagnostics()

  console.log(diagnostics)
}

Test

  describe(`simple cases`, () => {
    const project = new Project()
    const klass = loadClassFromFile('01.ts')('TestClass01', project)

    describe(`using types`, () => {
      fit(`says that "number" is assignable to "number"`, () => {
        const dst = klass.getPropertyOrThrow('p1').getType()
        const src = klass.getPropertyOrThrow('p1').getType()
        expect(isAssignable(project, dst, src)).toBe(true)
      })

Loaded file

class TestClass01 {

  p1: number = 1
  p2: string = '2'
  p3: number | string = 3
  p4: number | null = 4

Stack trace

1) isAssignable simple cases using types says that "number" is assignable to "number"
  Message:
    TypeError: Cannot read property 'flags' of undefined
  Stack:
        at <Jasmine>
        at Object.getCheckFlags (/home/lazar/wane/node_modules/ts-simple-ast/node_modules/typescript/lib/typescript.js:11719:23)
        at getTypeOfSymbol (/home/lazar/wane/node_modules/ts-simple-ast/node_modules/typescript/lib/typescript.js:29638:20)
        at checkVariableLikeDeclaration (/home/lazar/wane/node_modules/ts-simple-ast/node_modules/typescript/lib/typescript.js:45723:41)
        at checkVariableDeclaration (/home/lazar/wane/node_modules/ts-simple-ast/node_modules/typescript/lib/typescript.js:45789:20)
        at checkSourceElement (/home/lazar/wane/node_modules/ts-simple-ast/node_modules/typescript/lib/typescript.js:47748:28)
        at Object.forEach (/home/lazar/wane/node_modules/ts-simple-ast/node_modules/typescript/lib/typescript.js:1762:30)
        at checkVariableStatement (/home/lazar/wane/node_modules/ts-simple-ast/node_modules/typescript/lib/typescript.js:45799:16)
        at checkSourceElement (/home/lazar/wane/node_modules/ts-simple-ast/node_modules/typescript/lib/typescript.js:47717:28)
        at Object.forEach (/home/lazar/wane/node_modules/ts-simple-ast/node_modules/typescript/lib/typescript.js:1762:30)
        at checkSourceFileWorker (/home/lazar/wane/node_modules/ts-simple-ast/node_modules/typescript/lib/typescript.js:47889:20)
        at checkSourceFile (/home/lazar/wane/node_modules/ts-simple-ast/node_modules/typescript/lib/typescript.js:47868:13)
        at getDiagnosticsWorker (/home/lazar/wane/node_modules/ts-simple-ast/node_modules/typescript/lib/typescript.js:47933:17)
        at Object.getDiagnostics (/home/lazar/wane/node_modules/ts-simple-ast/node_modules/typescript/lib/typescript.js:47919:24)
        at /home/lazar/wane/node_modules/ts-simple-ast/node_modules/typescript/lib/typescript.js:76361:85
        at runWithCancellationToken (/home/lazar/wane/node_modules/ts-simple-ast/node_modules/typescript/lib/typescript.js:76324:24)
        at getSemanticDiagnosticsForFileNoCache (/home/lazar/wane/node_modules/ts-simple-ast/node_modules/typescript/lib/typescript.js:76347:20)
        at getAndCacheDiagnostics (/home/lazar/wane/node_modules/ts-simple-ast/node_modules/typescript/lib/typescript.js:76583:26)
        at getSemanticDiagnosticsForFile (/home/lazar/wane/node_modules/ts-simple-ast/node_modules/typescript/lib/typescript.js:76344:20)
        at getDiagnosticsHelper (/home/lazar/wane/node_modules/ts-simple-ast/node_modules/typescript/lib/typescript.js:76286:24)
        at Object.getSemanticDiagnostics (/home/lazar/wane/node_modules/ts-simple-ast/node_modules/typescript/lib/typescript.js:76299:20)
        at Program.getSemanticDiagnostics (/home/lazar/wane/node_modules/ts-simple-ast/dist/compiler/tools/Program.js:76:55)
        at SourceFile.getDiagnostics (/home/lazar/wane/node_modules/ts-simple-ast/dist/compiler/file/SourceFile.js:788:104)
        at Object.isAssignable (/home/lazar/wane/src/compiler/analyzer/utils/type-checker.ts:41:28)
        at UserContext.fit (/home/lazar/wane/src/compiler/analyzer/utils/tests/type-checker.spec.ts:15:16)
        at <Jasmine>
        at runCallback (timers.js:763:18)
        at tryOnImmediate (timers.js:734:5)
        at processImmediate (timers.js:716:5)

---

Sorry for vague description, I’ll create a repro later if you need it.

[dsherret]

Hi @lazarljubenovic,

There’s definitely something going on here, but I wasn’t able to reproduce when trying this:

const project = new Project();
const file = project.createSourceFile("test.ts", "const a: number = 0 as any as number");

console.log(file.getDiagnostics());

Can you see something I’m missing in that? Maybe it has to do with the way the project is setup.

[dsherret]

I’m not 100% clear in pure TypeScript compiler API

Me neither! 😄 I feel like I’m probably not doing something conventional here, but I’ll look into it more later.