@koopjs/featureserver/src/helpers/fields/query-fields.js

*An open source implementation of the GeoServices specification*

const Fields = require('./fields');

class QueryFields extends Fields {
  static create(inputOptions = {}) {
    const options = Fields.normalizeOptions(inputOptions);
    return new QueryFields(options);
  }

  constructor(options = {}) {
    super(options);

    const { outFields } = options;

    if (outFields && outFields !== '*') {
      return filterByOutfields(outFields, this.fields);
    }

    return this.fields;
  }
}

function filterByOutfields(outFields, fields) {
  const outFieldNames = outFields.split(',').map((field) => field.trim());
  return fields.filter((field) => {
    return outFieldNames.includes(field.name);
  });
}

module.exports = QueryFields;