TypeScript compiler is crashing on `next`

[blakeembrey]

It looks like it was introduced in e1b4f01#diff-233e1126c0abc811c4098757f9e4516eR2742, but I'm getting:

                 var path = sourceFile.path || ts.toPath(sourceFile.fileName, currentDirectory, getCanonicalFileName);
                                       ^
  TypeError: Cannot read property 'path' of undefined
      at sourceFileUpToDate (node_modules/typescript/lib/typescript.js:46061:38)
      at programUpToDate (node_modules/typescript/lib/typescript.js:46077:26)
      at synchronizeHostData (node_modules/typescript/lib/typescript.js:45958:17)
      at Object.getEmitOutput (node_modules/typescript/lib/typescript.js:49060:13)
      at getOutput (dist/ts-node.js:75:30)
      at compile (dist/ts-node.js:97:26)
      at Object.loader (dist/ts-node.js:110:27)
  ] to not exist
      at dist/ts-node.spec.js:9:2004
      at ChildProcess.exithandler (child_process.js:758:5)
      at maybeClose (child_process.js:1015:16)
      at Process.ChildProcess._handle.onexit (child_process.js:1087:5)

Reference: https://travis-ci.org/TypeStrong/ts-node/jobs/90594369

I went through the code and found that adding the default library path to the getScriptFileNames array fixes things. The specific case when the file is undefined is when ts-node is running over TypeScript, then JavaScript, and back to TypeScript. Might be able to occur on other loaders too, but I haven't investigated the root cause far enough yet. The two arrays compared for length on the previous line look like:

// Root file names according to TypeScript:
[ '/Users/blakeembrey/Projects/blakeembrey/ts-node/typings/ambient/main/node.d.ts',
  '/Users/blakeembrey/Projects/blakeembrey/ts-node/tests/complex/index.ts',
  '/Users/blakeembrey/Projects/blakeembrey/ts-node/tests/complex/foo.ts' ]

// File names in the source program:
[ '/Users/blakeembrey/Projects/blakeembrey/ts-node/node_modules/typescript/lib/lib.d.ts',
  '/Users/blakeembrey/Projects/blakeembrey/ts-node/typings/ambient/main/node.d.ts',
  '/Users/blakeembrey/Projects/blakeembrey/ts-node/tests/complex/index.ts' ]

Edit: Please let me know what other information is needed to narrow this down.

[mhegazy]

@vladima can you take a look?

[vladima]

good catch, thanks