index.js

var polyfill = require("@riim/object-entries-polyfill");

const escapeSpecialChars = (string) =>
  string.replace(/(?<!\\)[!"#$%&'()*+,./:;<=>?@\[\]^{}|~]/g, "\\$&");

function flattenObjSass(
  obj,
  prefix = "$",
  transform = (_derivedKey, val) => val
) {
  return Object.entries(obj).reduce((accumulated, [key, value]) => {
    const derivedKey = `${prefix}${escapeSpecialChars(key)}`;
    if (typeof value === "object" && !Array.isArray(value) && value) {
      const processedObject = flattenObjSass(
        value,
        `${derivedKey}-`,
        transform
      );
      return accumulated + processedObject;
    } else {
      const processedValue = Array.isArray(value)
        ? `(${transform(derivedKey, value)})`
        : transform(derivedKey, value);
      return accumulated + `${derivedKey}: ${processedValue}; `;
    }
  }, "");
}

module.exports = flattenObjSass;