Change style of element within shadow dom without variable ionic-v4

[anupzone]

yep but it’s not about few variables, there are lot. and for component creation in v4, getting errors. components not working. can u look into this please?

Component not working in ionic-v4

generated one component and using in page html but giving error. core.js:1633 ERROR Error: Uncaught (in promise): Error: Template parse errors: 'custcomp' is not a known element: 1. If 'custcomp' is an Angular component, then verify that it is part of this module. 2. To allow any element add 'NO_ERRORS_SCHEMA' to the '@NgModule.schemas' of this component. (" in html page <custcomp></custcomp>