Top Answers

1. Ionic and Firebase - InvalidPipeArgument: '[object Object]' for pipe 'AsyncPipe'
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2. update package.json file after Upgrade from @angular/cli 1.4.4 to 1.4.7
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3. Get current ngrx state without subscribe
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4. Angular Service with Subject Observable calling next() is not seen by Component subscriptions
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5. Angular 4.2+ animations query for .class::after
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