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export function trim(val: string): string {  return val.trim();}
export function compact(obj: any): object {  return Object.keys(obj).reduce((result: any, key) => {    if (obj[key]) {      result[key] = obj[key];    }    return result;  }, {});}
export function difference(arrA: string[], arrB: string[]): string[] {  return arrA.filter((a) => arrB.indexOf(a) < 0);}