> **Experimental** > > `@aws-cdk/aws-bedrock-alpha` is an [**experimental**](/stability) (alpha) package: its API may change in any release, without a major version bump. # KnowledgeBaseBase Base class for knowledge bases of any type, created or referenced. Extends: Construct › Resource › KnowledgeBaseBase Implements: IKnowledgeBase, IResource, IGrantable, IEnvironmentAware, IKnowledgeBaseRef, IConstruct, IDependable Superclass of: KnowledgeBase - Stability: [Experimental](/cdk/api/stability.html) - Source: [`bedrock/knowledge-bases/knowledge-base.ts`](https://github.com/aws/aws-cdk/blob/v2.274.0-alpha.0/packages/@aws-cdk/aws-bedrock-alpha/bedrock/knowledge-bases/knowledge-base.ts#L137) - Type last changed: v2.274.0-alpha.0 · 21 Oct 2026 ## Initializer ```ts new KnowledgeBaseBase(scope: Construct, id: string, props?: ResourceProps) ``` ## Construct Props - `account`: string = the resource is in the same account as the stack it belongs to — The AWS account ID this resource belongs to. **Default:** the resource is in the same account as the stack it belongs to - `environmentFromArn`: string = take environment from `account`, `region` parameters, or use Stack environment. — ARN to deduce region and account from. The ARN is parsed and the account and region are taken from the ARN. This should be used for imported resources. Cannot be supplied together with either `account` or `region`. **Default:** take environment from `account`, `region` parameters, or use Stack environment. - `physicalName`: string = The physical name will be allocated by CloudFormation at deployment time — The value passed in by users to the physical name prop of the resource. - `undefined` implies that a physical name will be allocated by CloudFormation during deployment. - a concrete value implies a specific physical name - `PhysicalName.GENERATE_IF_NEEDED` is a marker that indicates that a physical will only be generated by the CDK if it is needed for cross-environment references. Otherwise, it will be allocated by CloudFormation. **Default:** The physical name will be allocated by CloudFormation at deployment time - `region`: string = the resource is in the same region as the stack it belongs to — The AWS region this resource belongs to. **Default:** the resource is in the same region as the stack it belongs to ## Properties - `env`: [ResourceEnvironment](/cdk/api/v2/docs/aws-cdk-lib.interfaces.ResourceEnvironment.html) (required) — The environment this resource belongs to. For resources that are created and managed in a Stack (those created by creating new class instances like `new Role()`, `new Bucket()`, etc.), this is always the same as the environment of the stack they belong to. For referenced resources (those obtained from referencing methods like `Role.fromRoleArn()`, `Bucket.fromBucketName()`, etc.), they might be different than the stack they were imported into. - `grantPrincipal`: [IPrincipal](/cdk/api/v2/docs/aws-cdk-lib.aws_iam.IPrincipal.html) (required) — The principal to grant permissions to. - `grants`: [KnowledgeBaseGrants](/cdk/api/v2/docs/@aws-cdk_aws-bedrock-alpha.KnowledgeBaseGrants.html) (required) — Grant permissions on this knowledge base to IAM principals. - `knowledgeBaseArn`: string (required) — The ARN of the knowledge base. - `knowledgeBaseId`: string (required) — The unique identifier of the knowledge base. - `knowledgeBaseRef`: [KnowledgeBaseReference](/cdk/api/v2/docs/aws-cdk-lib.interfaces.aws_bedrock.KnowledgeBaseReference.html) (required) — A reference to a KnowledgeBase resource. - `node`: [Node](/cdk/api/v2/docs/constructs.Node.html) (required) — The tree node. - `reflections`: [KnowledgeBaseReflection](/cdk/api/v2/docs/@aws-cdk_aws-bedrock-alpha.KnowledgeBaseReflection.html) (required) — Resolves the underlying `CfnKnowledgeBase` from the construct tree. - `role`: [IRoleRef](/cdk/api/v2/docs/aws-cdk-lib.interfaces.aws_iam.IRoleRef.html) — The service role that Amazon Bedrock assumes to operate the knowledge base. To add permissions to the role, use `addToRolePolicy()` or grant to the knowledge base itself, which is an `IGrantable`. Undefined for imported knowledge bases whose role was not provided. - `stack`: [Stack](/cdk/api/v2/docs/aws-cdk-lib.Stack.html) (required) — The stack in which this resource is defined. ## Methods - `addToRolePolicy(statement: PolicyStatement): void` — Adds a statement to the IAM policy of the knowledge base service role. For a referenced knowledge base whose role was not provided, the statement cannot be applied; a warning is emitted with the statement to add to the role manually. - `applyCrossStackReferenceStrength(strength: ReferenceStrength): void` — Override the cross-stack reference strength for this resource. When set, any cross-stack reference to this resource will use the specified mechanism instead of the global default determined by the `@aws-cdk/core:defaultCrossStackReferences` context key. This is useful for selectively weakening specific references to avoid the "deadly embrace" problem without changing the app-wide default. **Parameters** - `strength` — - The reference strength to use for this resource. - `applyRemovalPolicy(policy: RemovalPolicy): void` — Apply the given removal policy to this resource. The Removal Policy controls what happens to this resource when it stops being managed by CloudFormation, either because you've removed it from the CDK application or because you've made a change that requires the resource to be replaced. The resource can be deleted (`RemovalPolicy.DESTROY`), or left in your AWS account for data recovery and cleanup later (`RemovalPolicy.RETAIN`). - `isConstruct(x: any): boolean` (static) — Checks if `x` is a construct. Use this method instead of `instanceof` to properly detect `Construct` instances, even when the construct library is symlinked. Explanation: in JavaScript, multiple copies of the `constructs` library on disk are seen as independent, completely different libraries. As a consequence, the class `Construct` in each copy of the `constructs` library is seen as a different class, and an instance of one class will not test as `instanceof` the other class. `npm install` will not create installations like this, but users may manually symlink construct libraries together or use a monorepo tool: in those cases, multiple copies of the `constructs` library can be accidentally installed, and `instanceof` will behave unpredictably. It is safest to avoid using `instanceof`, and using this type-testing method instead. **Parameters** - `x` — Any object. **Returns:** true if `x` is an object created from a class which extends `Construct`. - `isOwnedResource(construct: IConstruct): boolean` (static) — Returns true if the construct was created by CDK, and false otherwise. - `isResource(construct: IConstruct): boolean` (static) — Check whether the given construct is a Resource. - `toString(): string` — Returns a string representation of this construct. - `with(...mixins: IMixin[]): IConstruct` — Applies one or more mixins to this construct. Mixins are applied in order. The list of constructs is captured at the start of the call, so constructs added by a mixin will not be visited. Use multiple `with()` calls if subsequent mixins should apply to added constructs.