// When a regex has the global flag set, test() will advance the lastIndex of the regex.
export const extJsReg = /\.jsx?$/i
export const extTsReg = /\.tsx?$/i

export function isExtJs(filepath: string): boolean {
  return extJsReg.test(filepath)
}

export function isExtTs(filepath: string): boolean {
  return extTsReg.test(filepath)
}

export function extTsToJs(filepath: string): string {
  return filepath.replace(extTsReg, (match) => {
    return match === '.ts' ? '.js' : '.jsx'
  })
}