Error: The function visitor.visitUnaryOperatorExpr is not defined as a function

I recently started developing an Angular app with a purchased template and collaborating with another developer. Initially, I was able to successfully build the project for production using ng build --prod. However, when trying to build it again yesterday, I encountered the error message 

TypeError: visitor.visitUnaryOperatorExpr is not a function
(full error provided below). Is there a way to obtain a complete stack trace or fix this issue? Here are some of the steps I've attempted:

  1. building with 
    ng build --prod --source-map=true
  2. trying to compile with 
    ng build --configuration=production --source-map=true
  3. updating all node and angular packages through npm

Below you can find the generated stack trace:

Error: TypeError: visitor.visitUnaryOperatorExpr is not a function
    at UnaryOperatorExpr.visitExpression (M:\User\Documents\GitHub\Website-2.0\node_modules\@angular\compiler\bundles\compiler.umd.js:1976:28)
    at NodeEmitterVisitor.visitConditionalExpr (M:\User\Documents\GitHub\Website-2.0\node_modules\@angular\compiler-cli\src\transformers\node_emitter.js:468:132)
    at ConditionalExpr.visitExpression (M:\User\Documents\GitHub\Website-2.0\node_modules\@angular\compiler\bundles\compiler.umd.js:1865:28)    
    ...additional error trace here...
angulartypescriptnode-modules

Answer №1

It's hard to pinpoint the exact version of Angular you're working with, and what specific dependencies are listed in your packages.json file.

However, I once faced a similar issue which was resolved by updating my Angular Compiler CLI to the latest version. After running 

npm i @angular/compiler-cli@latest
, the error disappeared.

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