Property 'DISABLE_6X_DEPRECATIONS' does not exist on type '{ DEPRECATE_CATCH_ALL?: boolean | undefined; DEPRECATE_NON_STRICT_TYPES?: boolean | undefined; DEPRECATE_NON_STRICT_ID?: boolean | undefined; DEPRECATE_COMPUTED_CHAINS?: boolean | undefined; DEPRECATE_LEGACY_IMPORTS?: boolean | undefined; DEPRECATE_NON_UNIQUE_PAYLOADS?: boolean | undefined; DEPRECATE_RELATIONSHIP_REMOTE_UPDATE_CLEARING_LOCAL_STATE?: boolean | undefined; DEPRECATE_MANY_ARRAY_DUPLICATES?: boolean | undefined; DEPRECATE_STORE_EXTENDS_EMBER_OBJECT?: boolean | undefined; ENABLE_LEGACY_SCHEMA_SERVICE?: boolean | undefined; DEPRECATE_EMBER_INFLECTOR?: boolean | undefined; }'.

Type 'boolean | undefined' is not assignable to type 'boolean'.