Function extractQueriesMetadata

packages/core/src/render3/jit/directive.ts:444–478

(
  type: Type<any>,
  propMetadata: {[key: string]: any[]},
  isQueryAnn: (ann: any) => ann is Query,
)

  };
}
function extractQueriesMetadata(
  type: Type<any>,
  propMetadata: {[key: string]: any[]},
  isQueryAnn: (ann: any) => ann is Query,
): R3QueryMetadataFacade[] {
  const signalQueriesMeta: R3QueryMetadataFacade[] = [];
  const decoratorQueriesMeta: R3QueryMetadataFacade[] = [];
  for (const field in propMetadata) {
    if (propMetadata.hasOwnProperty(field)) {
      const annotations = propMetadata[field];
      annotations.forEach((ann) => {
        if (isQueryAnn(ann)) {
          if (!ann.selector) {
            throw new Error(
              `Can't construct a query for the property "${field}" of ` +
                `"${stringifyForError(type)}" since the query selector wasn't defined.`,
            );
          }
          if (annotations.some(isInputAnnotation)) {
            throw new Error(`Cannot combine @Input decorators with query decorators`);
          }
          const queryMeta = convertToR3QueryMetadata(field, ann);
          if (queryMeta.isSignal) {
            signalQueriesMeta.push(queryMeta);
          } else {
            decoratorQueriesMeta.push(queryMeta);
          }
        }
      });
    }
  }

  // We match the behavior of AOT here by having signal queries first, then the decorator queries.
  return [...signalQueriesMeta, ...decoratorQueriesMeta];
}

function extractExportAs(exportAs: string | undefined): string[] | null {
  return exportAs === undefined ? null : splitByComma(exportAs);