Function add

scripts/lib/dotenv.js:53–80

(varName, defaultValue, comment)

  };

  function add(varName, defaultValue, comment) {
    const SET = `\n${varName}=`;
    const encodedValue = encodeDotenvValue(
      varName in answers ? answers[varName] : defaultValue || ""
    );
    const pos = data.indexOf(SET);
    if (pos >= 0) {
      /* Replace this value with the new value */

      // Where's the next newline (or the end of the file if there is none)
      let nlpos = data.indexOf("\n", pos + 1);
      if (nlpos < 0) {
        nlpos = data.length;
      }

      // Surgical editing
      data =
        data.substr(0, pos + SET.length) + encodedValue + data.substr(nlpos);
    } else {
      /* This value didn't already exist; add it to the end */

      if (comment) {
        data += `\n\n${comment}`;
      }

      data += `${SET}${encodedValue}`;
    }
  }

  await callback(add);