Cannot read property 'heritageClauses' of undefined

[mhevery]

TypeScript Version: 1.8.0 / nightly (2.0.0-dev.201xxxxx)
Version 1.9.0-dev.20160409

Code

type.ts:

export var Type = Function;

export interface Type<T> extends Function { new (...args: any[]): T; }

import {Type} from './type';

interface TypeProvider extends Type<any>
;

It provides a correct error here:
https://www.typescriptlang.org/play/#src=export%20var%20Type%20%3D%20Function%3B%0D%0A%0D%0Aexport%20interface%20Type%3CT%3E%20extends%20Function%20%7B%20new%20(...args%3A%20any%5B%5D)%3A%20T%3B%20%7D%0D%0A%0D%0Ainterface%20TypeProvider%20extends%20Type%3Cany%3E%0D%0A%3B%0D%0A

Expected behavior:

a reasonable error

Actual behavior:

TypeError: Cannot read property 'heritageClauses' of undefined
    at Object.getClassExtendsHeritageClauseElement (/Users/misko/work/angular/node_modules/typescript/lib/typescript.js:6149:52)
    at getBaseTypeNodeOfClass (/Users/misko/work/angular/node_modules/typescript/lib/typescript.js:17884:23)
    at getBaseConstructorTypeOfClass (/Users/misko/work/angular/node_modules/typescript/lib/typescript.js:17905:36)
    at resolveBaseTypesOfClass (/Users/misko/work/angular/node_modules/typescript/lib/typescript.js:17948:39)
    at Object.writeBaseConstructorTypeOfClass (/Users/misko/work/angular/node_modules/typescript/lib/typescript.js:30259:13)
    at emitTypeOfTypeReference (/Users/misko/work/angular/node_modules/typescript/lib/typescript.js:32596:30)
    at emitSeparatedList (/Users/misko/work/angular/node_modules/typescript/lib/typescript.js:31999:21)
    at emitCommaList (/Users/misko/work/angular/node_modules/typescript/lib/typescript.js:32004:13)
    at emitHeritageClause (/Users/misko/work/angular/node_modules/typescript/lib/typescript.js:32585:17)
    at writeInterfaceDeclaration (/Users/misko/work/angular/node_modules/typescript/lib/typescript.js:32662:13)
Compilation failed

[ghost]

I tested this code with the typescript version you gave (1.9.0-dev.20160409) .
I used two files, type.ts and a.ts, with the contents you provided, and an empty tsconfig.json.
I just get the errors:

a.ts(4,1): error TS1005: '(' expected.
a.ts(4,2): error TS1005: '{' expected.

If I change the code in a.ts to end in interface TypeProvider extends Type<any> {}, it compiles with no errors.

As you said, it was working for you on the playground, so there must be something unique to your configuration. Can you reproduce the error in a sample project, and provide the tsconfig.json that you used to reproduce it?

I can tell that you are emitting declaration files, because that's where the error happens, but running tsc --declaration still won't reproduce the error.

[mhegazy]

This sample seems to work fine. Please try typescript@next, and if this still an issue, reopen.