ghost/core/client/utils/word-count.js

export default function (s) {
    s = s.replace(/(^\s*)|(\s*$)/gi, ''); // exclude  start and end white-space
    s = s.replace(/[ ]{2,}/gi, ' '); // 2 or more space to 1
    s = s.replace(/\n /, '\n'); // exclude newline with a start spacing
    return s.split(' ').length;
}