lib/async/index.js
function known (outputFile) {
    var result = false;
    this.csFactory(function (done) {
      result =
        this._exists(outputFile) || this.filesDone.indexOf(outputFile) > -1;
      done();
    }.bind(this), L_WAIT)();
    return result;
  }
function known (outputFile) {
    var result = false;
    this.csFactory(function (done) {
      result =
        this._exists(outputFile) || this.filesDone.indexOf(outputFile) > -1;
      done();
    }.bind(this), L_WAIT)();
    return result;
  }
Check if a file is being processed or has already been processed.

@param {String} outputFile - The outputFile to check.
@returns {Boolean} true if the fi