v21.2.9
build: add import maps `extract_api_to_json` (#32407)
docs: add reference links to ARIA (#32498)
refactor(aria/combobox): split directives and resolve circular dependencies
refactor(multiple): create tree behavior (#32569)
refactor(multiple): avoid rxjs interop (#32534)
build: set up public-api files for aria (#32535)
fix(multiple): type issues when importing Aria directives (#32561)