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export default function (cow: string, variables: any): string {  const eyes = escapeRe(variables.eyes);  const eyeL = eyes.charAt(0);  const eyeR = eyes.charAt(1);  const tongue = escapeRe(variables.tongue);
  if (cow.indexOf("$the_cow") !== -1) {    cow = extractTheCow(cow);  }
  return cow    .replace(/\$thoughts/g, variables.thoughts)    .replace(/\$eyes/g, eyes)    .replace(/\$tongue/g, tongue)    .replace(/\$\{eyes\}/g, eyes)    .replace(/\$eye/, eyeL)    .replace(/\$eye/, eyeR)    .replace(/\$\{tongue\}/g, tongue);}/* * "$" dollar signs must be doubled before being used in a regex replace * This can occur in eyes or tongue. * For example: * * cowsay -g Moo! * * cowsay -e "\$\$" Moo! */
function escapeRe(s: string): string {  if (s && s.replace) {    return s.replace(/\$/g, "$$$$");  }  return s;}
function extractTheCow(cow: string): string {  cow = cow.replace(/\r\n?|[\n\u2028\u2029]/g, "\n").replace(/^\uFEFF/, "");  const match = /\$the_cow\s*=\s*<<"*EOC"*;*\n([\s\S]+)\nEOC\n/.exec(cow);
  if (!match) {    console.error("Cannot parse cow file\n", cow);    return cow;  } else {    return match[1].replace(/\\{2}/g, "\\").replace(/\\@/g, "@").replace(      /\\\$/g,      "$",    );  }}