Callback not called when runningsPath points to invalid file

[iamjoeker]

I'm using this library in a typescript project based on NestJS. I recently ran into a problem where my runnings file was not correctly copied to the build directory. This resulted in a timeout and the callback not being called at all.

Code Clip

      MarkdownPDF({
        cssPath: path.join(__dirname, 'policy.css'),
        paperFormat: 'Letter',
        remarkable: {
          preset: 'full',
          html: true,
          breaks: false,
          typographer: true,
        },
        runningsPath: path.join(__dirname, 'runnings.js'),
      }).from.string(replacedMarkdown).to.buffer({}, (err, buff) => {
        this.logger.debug('In to.buffer callback');
        this.logger.debug(err);
        this.logger.debug(buff);

        if (err) {
          this.logger.error(`Error while generating pdf: ${err.message}`);
          reject(err);
        } else {
          resolve(buff);
        }
      })

If runnings.js does not exist in the same directory as this file, the callback is never called (i.e. I don't see the logger message).

Expected Results

I expect that if the file specified in runningsPath or cssPath are not present that the callback be called with an appropriate err value.