Function constructIndexDescriptionMap

src/operations/indexes.ts:174–198

* Converts an `IndexSpecification`, which can be specified in multiple formats, into a * valid `key` for the createIndexes command.

(indexSpec: IndexSpecification)

 * valid `key` for the createIndexes command.
 */
function constructIndexDescriptionMap(indexSpec: IndexSpecification): Map<string, IndexDirection> {
  const key: Map<string, IndexDirection> = new Map();

  const indexSpecs =
    !Array.isArray(indexSpec) || isSingleIndexTuple(indexSpec) ? [indexSpec] : indexSpec;

  // Iterate through array and handle different types
  for (const spec of indexSpecs) {
    if (typeof spec === 'string') {
      key.set(spec, 1);
    } else if (Array.isArray(spec)) {
      key.set(spec[0], spec[1] ?? 1);
    } else if (spec instanceof Map) {
      for (const [property, value] of spec) {
        key.set(property, value);
      }
    } else if (isObject(spec)) {
      for (const [property, value] of Object.entries(spec)) {
        key.set(property, value);
      }
    }
  }

  return key;
}

/**
 * Receives an index description and returns a modified index description which has had invalid options removed