Tsc crash ("Debug Failure. False expression:")

[kpreisser]

Hi,
I think the following code should not cause tsc to crash:

TypeScript Version: Version 2.1.0-dev.20160824

Code (test1.ts)

export let a;
export = {};

Expected behavior:

test1.ts(2,1): error TS2309: An export assignment cannot be used in a module with other exported elements.

Actual behavior:

C:\Users\VPC\AppData\Roaming\npm\node_modules\typescript\lib\tsc.js:37652
                throw e;
                ^

Error: Debug Failure. False expression:
    at Object.assert (C:\Users\VPC\AppData\Roaming\npm\node_modules\typescript\lib\tsc.js:1289:23)
    at Object.fail (C:\Users\VPC\AppData\Roaming\npm\node_modules\typescript\lib\tsc.js:1294:19)
    at Object.findMap (C:\Users\VPC\AppData\Roaming\npm\node_modules\typescript\lib\tsc.js:211:15)
    at getDeclarationOfAliasSymbol (C:\Users\VPC\AppData\Roaming\npm\node_modules\typescript\lib\tsc.js:13935:23)
    at checkExternalModuleExports (C:\Users\VPC\AppData\Roaming\npm\node_modules\typescript\lib\tsc.js:26465:39)
    at checkExportAssignment (C:\Users\VPC\AppData\Roaming\npm\node_modules\typescript\lib\tsc.js:26441:13)
    at checkSourceElement (C:\Users\VPC\AppData\Roaming\npm\node_modules\typescript\lib\tsc.js:26609:28)
    at Object.forEach (C:\Users\VPC\AppData\Roaming\npm\node_modules\typescript\lib\tsc.js:185:30)
    at checkSourceFileWorker (C:\Users\VPC\AppData\Roaming\npm\node_modules\typescript\lib\tsc.js:26661:20)
    at checkSourceFile (C:\Users\VPC\AppData\Roaming\npm\node_modules\typescript\lib\tsc.js:26647:13)

Note: The error seems to have been introduced with commit e900952 (with c9f62f3 I'm getting the expected error message).

Thanks!

[ghost]

Related to #10460

[sandersn]

It's pretty close to a dupe. I'll fix it with #10460.

[sandersn]

Fix is up at #10538

[Ciantic]

tsc --version
Version 2.2.0-dev.20161210

I'm getting error:

Error: Debug Failure. False expression

My only TS file is test.ts with this:

import { Collapse } from '@blueprintjs/core';

very odd.

[Ciantic]

Here is cloneable gist: https://gist.github.com/Ciantic/60e9dbe330922cfc41086e255820df62

$ tsc --version
Version 2.2.0-dev.20161210
$ npm install
$ tsc
...\typescript\lib\tsc.js:1796
                throw new Error("Debug Failure. False expression: " + (message || "") + verboseDebugString);
                ^

Error: Debug Failure. False expression:

[mhegazy]

@Ciantic, this is a different issue. the debug message is the same for all debug asserts. I have filed a new issue to track this: #12827

seems that the problem is that @blueprintjs/core augments tether, but does not have a dependency on @types/tether in package.json.

Installing the @types/tether should avoid this error. but really the fix should be in @blueprintjs/core package.json.

either ways, the compiler should not crash, and #12827 tracks fixing that.