Function describeInjectedArguments

packages/context/src/inject.ts:571–616

(
  target: Object,
  method?: string,
)

 * @param method - Method name, undefined for constructor
 */
export function describeInjectedArguments(
  target: Object,
  method?: string,
): Readonly<Injection>[] {
  method = method ?? '';

  // Try to read from cache
  const cache =
    MetadataInspector.getAllMethodMetadata<Readonly<Injection>[]>(
      INJECT_METHODS_KEY,
      target,
      {
        ownMetadataOnly: true,
      },
    ) ?? {};
  let meta: Readonly<Injection>[] = cache[method];
  if (meta) return meta;

  // Build the description
  const options: InspectionOptions = {};
  if (method === '') {
    if (shouldSkipBaseConstructorInjection(target)) {
      options.ownMetadataOnly = true;
    }
  } else if (Object.prototype.hasOwnProperty.call(target, method)) {
    // The method exists in the target, no injections on the super method
    // should be honored
    options.ownMetadataOnly = true;
  }
  meta =
    MetadataInspector.getAllParameterMetadata<Readonly<Injection>>(
      INJECT_PARAMETERS_KEY,
      target,
      method,
      options,
    ) ?? [];

  // Cache the result
  cache[method] = meta;
  MetadataInspector.defineMetadata<MetadataMap<Readonly<Injection>[]>>(
    INJECT_METHODS_KEY,
    cache,
    target,
  );
  return meta;
}

/**
 * Inspect the target type for the injection to find out the corresponding