getJSDocTags ... Debug Failure. False expression.

[burtonator]

I get this exception when trying to migrate an existing JS app to TS.

/home/burton/projects/polar-bookshelf/node_modules/typescript/lib/tsc.js:63860
                throw e;
                ^

Error: Debug Failure. False expression.
    at getJSDocTags (/home/burton/projects/polar-bookshelf/node_modules/typescript/lib/tsc.js:10302:22)
    at getFirstJSDocTag (/home/burton/projects/polar-bookshelf/node_modules/typescript/lib/tsc.js:10309:24)
    at Object.getJSDocType (/home/burton/projects/polar-bookshelf/node_modules/typescript/lib/tsc.js:10286:19)
    at getContextualSignature (/home/burton/projects/polar-bookshelf/node_modules/typescript/lib/tsc.js:33934:32)
    at checkFunctionExpressionOrObjectLiteralMethod (/home/burton/projects/polar-bookshelf/node_modules/typescript/lib/tsc.js:36773:43)
    at checkExpressionWorker (/home/burton/projects/polar-bookshelf/node_modules/typescript/lib/tsc.js:37696:28)
    at checkExpression (/home/burton/projects/polar-bookshelf/node_modules/typescript/lib/tsc.js:37629:42)
    at checkBinaryLikeExpression (/home/burton/projects/polar-bookshelf/node_modules/typescript/lib/tsc.js:37246:29)
    at checkBinaryExpression (/home/burton/projects/polar-bookshelf/node_modules/typescript/lib/tsc.js:37238:20)
    at checkExpressionWorker (/home/burton/projects/polar-bookshelf/node_modules/typescript/lib/tsc.js:37717:28)

.. I imagine I have malformed JSDoc tags that I need to resolve but I can't find out which one is causing the problem. I went through and looked at the last .js file from my app it's printing and removed the JSDoc and that didn't resolve the problem.

It would be nice if TSC didn't choke but even just better error handling so I can fix this myself would be nice.

TypeScript Version: 2.9.2

Search Terms:

getJSDocTags " Debug Failure. False expression."

Code
I'm not sure

Expected behavior:

Don't generate this error but at least show me where the problem is happening.

Actual behavior:

Playground Link:

Related Issues:

The bug is happening due to a jsdoc comment somewhere in your program. You might be able to narrow it down by making a clone of your repository and deleting files until the error no longer happens, then narrow down the particular file that was responsible. Or if you can, you could just share a link to the project.

[j-oliveras]

Duplicate of #25067?

May be -- @burtonator Be sure to test with typescript@next to ensure it's not already fixed.

[burtonator]

Fixed on 3.0.0-rc!

[typescript-bot]

Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.

[mcblum]

@Andy-MS just seeing this in our project as well, but we're stuck at 2.7.2 due to the deps of @angular/cli. Any idea if there's a way to work around this?

@mcblum The original issue is #24963. You should be able to fix it by separating duplicate assignments a = b = c into b = c; a = b;.

[mcblum]

@Andy-MS thanks for the reply. so these issues appear to be related to dependencies of the project. I've created a Pastebin. If you have any ideas, it would be much appreciated!

https://paste.laravel.io/f617665b-bfd9-44fd-96ba-b296cb8b3d5e

Edit: also, these errors are being thrown with TS 3.0.1.

@mcblum Maybe you could avoid compiling your node_modules with TypeScript and use type declarations instead?

Also, I don't see any errors running tsc auth0.js --noEmit --strict --allowJs with typescript@3.0 installed, so your build tool may not be using the TypeScript version you think it is. Try getting a repro that just uses tsc.

[mcblum]

@Andy-MS interesting. I ran ng --version and it shows 3.0.1. When you say avoid compiling, what exactly does that mean? At the moment we're using the standard Angular CLI build process - to be honest, I'm not sure what it's doing behind the curtain.