How to debug the error that's generated while building with ng build --prod?

Question

I have created an app and wanted to build it using ng build --prod. While I did so, I got an error message with the current version of syncfusion.

The following is the error I'm getting:

ERROR in ./node_modules/@syncfusion/ej2-angular-dropdowns/@syncfusion/ej2-angular-dropdowns.es5.js
Module build failed (from ./node_modules/@angular-devkit/build-optimizer/src/build-optimizer/webpack-loader.js):
Error: Debug Failure. False expression.
    at getJSDocTags (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:13197:22)
    at getFirstJSDocTag (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:13205:24)
    at Object.getJSDocTypeTag (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:13154:19)
    at checkParenthesizedExpression (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45628:56)
    at checkExpressionWorker (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45676:28)
    at checkExpression (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45609:42)
    at checkBinaryLikeExpression (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45155:29)
    at checkBinaryExpression (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45147:20)
    at checkExpressionWorker (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45702:28)
    at checkExpression (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45609:42)
    at checkExpressionCached (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45457:38)
    at getTypeOfExpression (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45577:28)
    at checkDeclarationInitializer (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45469:24)
    at getTypeForVariableLikeDeclaration (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:30738:28)
    at getWidenedTypeForVariableLikeDeclaration (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:30961:24)
    at getTypeOfVariableOrParameterOrProperty (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:31062:28)
ERROR in ./node_modules/@syncfusion/ej2-angular-calendars/@syncfusion/ej2-angular-calendars.es5.js
Module build failed (from ./node_modules/@angular-devkit/build-optimizer/src/build-optimizer/webpack-loader.js):
Error: Debug Failure. False expression.
    at getJSDocTags (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:13197:22)
    at getFirstJSDocTag (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:13205:24)
    at Object.getJSDocTypeTag (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:13154:19)
    at checkParenthesizedExpression (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45628:56)
    at checkExpressionWorker (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45676:28)
    at checkExpression (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45609:42)
    at checkBinaryLikeExpression (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45155:29)
    at checkBinaryExpression (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45147:20)
    at checkExpressionWorker (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45702:28)
    at checkExpression (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45609:42)
    at checkExpressionCached (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45457:38)
    at getTypeOfExpression (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45577:28)
    at checkDeclarationInitializer (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45469:24)
    at getTypeForVariableLikeDeclaration (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:30738:28)
    at getWidenedTypeForVariableLikeDeclaration (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:30961:24)
    at getTypeOfVariableOrParameterOrProperty (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:31062:28)
ERROR in ./node_modules/@syncfusion/ej2-angular-inputs/@syncfusion/ej2-angular-inputs.es5.js
Module build failed (from ./node_modules/@angular-devkit/build-optimizer/src/build-optimizer/webpack-loader.js):
Error: Debug Failure. False expression.
    at getJSDocTags (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:13197:22)
    at getFirstJSDocTag (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:13205:24)
    at Object.getJSDocTypeTag (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:13154:19)
    at checkParenthesizedExpression (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45628:56)
    at checkExpressionWorker (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45676:28)
    at checkExpression (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45609:42)
    at checkBinaryLikeExpression (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45155:29)
    at checkBinaryExpression (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45147:20)
    at checkExpressionWorker (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45702:28)
    at checkExpression (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45609:42)
    at checkExpressionCached (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45457:38)
    at getTypeOfExpression (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45577:28)
    at checkDeclarationInitializer (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:45469:24)
    at getTypeForVariableLikeDeclaration (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:30738:28)
    at getWidenedTypeForVariableLikeDeclaration (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:30961:24)
    at getTypeOfVariableOrParameterOrProperty (F:\school-web-admin\node_modules\@angular-devkit\build-optimizer\node_modules\typescript\lib\typescript.js:31062:28)
i ｢wdm｣: Failed to compile

.

The following is the dependency used for Syncfusion:

"@syncfusion/ej2-angular-calendars": "^17.1.49",
"@syncfusion/ej2-angular-dropdowns": "^17.1.49",
"@syncfusion/ej2-angular-inputs": "^17.1.49",
"@syncfusion/ej2-angular-splitbuttons": "^17.1.47",

NOTE: It runs successfully with just ng build.

definitely looks like one of your dependencies... `ERROR in ./node_modules/@syncfusion/ej2-angular-inputs/@syncfusion/ej2-angular-inputs.es5.js` Maybe your configured to use `AOT` on prod build and this module doesn't support `AOT`? — wickdninja, Jun 13 '19 at 05:55
Maybe your issue is similar to https://github.com/Microsoft/TypeScript/issues/24577 — wickdninja, Jun 13 '19 at 06:08
I checked the same before posting the question, But there isnt' any @typedef in the js file. — krishie, Jun 13 '19 at 06:23
have you reached out to @syncfusion? Isn't that a paid suite of tools? I'd expect you get some support with them right? — wickdninja, Jun 13 '19 at 06:33
Faced the same issue when I use date range picker - did you find the solution for? @syncfusion/ej2-angular-calendars/@syncfusion/ej2-angular-calendars.es5.js — Victor Orletchi, Apr 12 '21 at 19:11

score 0 · Answer 1 · answered Jun 18 '19 at 06:10

We checked the reported issue with the Syncfusion component mentioned, but we cannot reproduce the same in our end. We suspect that this issue is due to build-optimizer so we're asking you to share the details below to help you better.

angular-cli version 
@angular-devkit\build-optimizer version

However, we have created a sample for your reference that you can download form the link below.

Sample: http://www.syncfusion.com/downloads/support/directtrac/239187/ze/angular-apps-514191590

Please let us know if you have any other queries.

Regards,

Syncfusion Team

How to debug the error that's generated while building with ng build --prod?

1 Answers1