'How can I declare a main attribute in ts file and use it in different ts files from different components

I have a main attribute isSigned in app.component.ts app.component.ts and I want to use this attribute in signIn.component.tssignIn.component.ts and nav-bar.component.ts nav-bar.component.ts but i can't access to the main attribute isSigned

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'How can I declare a main attribute in ts file and use it in different ts files from different components

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