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angularangular5xdebugproduction

Angular 5: Why in debug mode it's no show up 'Component is part of the declaration of 2 modules'

When I run for debug mode with this command: npm run build, I will have all the dist folder and I can deploy the project.

When I run for production with this command: npm run build -- --prod, I will have this error 'Component is part of the declaration of 2 modules'.

My question is: Why this difference between the two mode ? Is this caused by the AOT option?

Solution

  • That's just a thing about Angular's Ahead of Time compilation. Because it eliminates code, it is a lot stricter than the debug compile and several other errors are also only reported in AOT compiles.

    Generally, I do a ng build -prod (which implies AOT) before I commit for exactly this reason.

    Since you're using the npm scripts, I would use the syntax @trichetriche suggested:

    npm run build -- --aot