Writing Custom Modules and Formatters (NodeJS)

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You need to convert the path to system path first. Here the exists action of the fs module with a little modification to use it in the extensions folder.

const fs = require('fs-extra');
const { toSystemPath } = require('../../lib/core/path');

exports.exists = async function(options) {
  let path = toSystemPath(this.parseRequired(options.path, 'string', 'fs.exists: path is required.'));

  if (fs.existsSync(path)) {
    if (options.then) this.exec(options.then, true);
    return true;
  } else {
    if (options.else) this.exec(options.else, true);
    return false;
  }
}
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