Function stringPercentDecode

github-actions/saucelabs/set-saucelabs-env.js:3521–3524

(input)

        const idx = input.indexOf(char, position.position);
        const start = position.position;
        if (idx === -1) {
          position.position = input.length;
          return input.slice(start);
        }
        position.position = idx;
        return input.slice(start, position.position);
      }