How to use the node-sass.types.Boolean function in node-sass

function convert(value) {
  if (value instanceof types.Boolean || value instanceof types.String) {
    return value.getValue();
  }

  if (value instanceof types.Number) {
    if (value.getValue() === 0) {
      return value.getValue();
    }
    return `${value.getValue()}${value.getUnit()}`;
  }

  if (value instanceof types.Color) {
    if (value.getA() !== 1) {
      const r = value.getR();
      const g = value.getG();
      const b = value.getB();
      const a = value.getA();

function convert(value) {
  if (value instanceof types.Boolean || value instanceof types.String) {
    return value.getValue();
  }

  if (value instanceof types.Number) {
    return `${value.getValue()}${value.getUnit()}`;
  }

  if (value instanceof types.List) {
    const length = value.getLength();
    const list = [];

    for (let i = 0; i < length; i++) {
      list.push(convert(value.getValue(i)));
    }

    return list;

function convert(value) {
  if (value instanceof types.Boolean || value instanceof types.String) {
    return value.getValue();
  }

  if (value instanceof types.Number) {
    return `${value.getValue()}${value.getUnit()}`;
  }

  if (value instanceof types.List) {
    const length = value.getLength();
    const list = [];

    for (let i = 0; i < length; i++) {
      list.push(convert(value.getValue(i)));
    }

    return list;

function toBoolean(value) {
    return value === sassTypes.Boolean.TRUE
  }