noerror.js

try {
  const decodedString = [stringWithoutNonUnicode]
    .map(splitByWhitespace)[0]
    .map(replaceWithOriginal(listOfDecodedWords))
    .join("")
    .replace(/./g, (char, index) =>
      !unicodeWord.test(char) ? str[index] : char
    );

  console.log(decodedString);

  return {
    errorMessage: "",
    decodedString: decodedString
  };
} catch (e) {
  return {
    errorMessage: e,
    decodedString: ""
  };
}

replaceWithOriginal.js

import _ from "lodash";
import isMiddlePermutable from "../strings/isMiddlePermutable";

export default strList => {
  return inputString => {
    const replacement = strList.find(originalString =>
      _.isEqual(
        _.sortBy(inputString.split("")),
        _.sortBy(originalString.split(""))
      )
    );
    console.log(replacement);
    if (!!replacement && isMiddlePermutable(inputString)) {
      console.log("here");
      throw Error(`${inputString} has no decoder word`);
    } else {
      return replacement;
    }
  };
};