isBoolean.ts

/**
  * Check if the component disabled value is "truthy"
  *
  * This check is done here due to ngc throwing an error when the logic is in the template
  *
  * @param disabledValue string or boolean value to evaluate
  */
public isDisabled(disabledValue: boolean | string) {
  if (disabledValue === true || disabledValue === "true") {
    return true;
  }

  return null;
}

/* It really should be... */
public isDisabled(disabledValue: boolean | string) {
  return Boolean(disabledValue);
}