validate-cpf.ts

export function validateCpf(cpf: string) {	
	cpf = cpf.replace(/[^\d]+/g,'')
  
	if (
		cpf.length !== 11 || 
		cpf === '' || 
		cpf === "00000000000" || 
		cpf === "11111111111" || 
		cpf === "22222222222" || 
		cpf === "33333333333" || 
		cpf === "44444444444" || 
		cpf === "55555555555" || 
		cpf === "66666666666" || 
		cpf === "77777777777" || 
		cpf === "88888888888" || 
		cpf === "99999999999"
	  ) {
		return false;		
	}
    
	let add = 0;	
	for (let i=0; i < 9; i++)	{
		add += parseInt(cpf.charAt(i)) * (10 - i);	
	}	
		
	let rev = 11 - (add % 11);	
	if (rev == 10 || rev == 11) rev = 0;	
	if (rev != parseInt(cpf.charAt(9))) return false;		

	add = 0;	
	for (let i = 0; i < 10; i ++)	{
		add += parseInt(cpf.charAt(i)) * (11 - i);	
	}	

	rev = 11 - (add % 11);	
	if (rev == 10 || rev == 11)	rev = 0;	
	if (rev != parseInt(cpf.charAt(10))) return false

	return true;   
}

Regex for formatting the input to the CPF pattern XXX.XXX.XXX-XX

const formatCpf = /^\d{3}\.\d{3}\.\d{3}-\d{2}$/