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a guest Sep 11th, 2019 90 Never
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  1. import { FormControl } from '@angular/forms';
  2.  
  3. export function isNumber(c: FormControl) {
  4.   return !isNaN(c.value) ? null : {
  5.     isNumber: {
  6.       valid: false
  7.     }
  8.   };
  9. }
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