A pure function that adds nbsp between one-character word and a previous word.

nbspScript.ts

export const nbspScript = (text: string) => {
  const input = text.split(' ');
  let output = input[input.length - 1];
  for (let index = 0; index < input.length; index++) {
    const reversedIndex = input.length - index - 1;
    const word = input[reversedIndex];
    if (reversedIndex !== input.length - 1) {
      if (word.length > 1) {
        output = `${word} ${output}`;
      } else {
        output = `${word}\u00A0${output}`;
      }
    }
  }
  return output;
};