# IFileSystem

Represents an Amazon EFS file system.

Extends: IFileSystem
Extends: IFileSystemRef, IConnectable, IResourceWithPolicy
Implemented by: FileSystem

- Source: [`aws-efs/lib/efs-file-system.ts`](https://github.com/aws/aws-cdk/blob/v2.275.0/packages/aws-cdk-lib/aws-efs/lib/efs-file-system.ts#L152)
- Type last changed: v2.234.0 · 8 Jan 2026

## Properties

- `connections`: [Connections](/cdk/api/v2/docs/aws-cdk-lib.aws_ec2.Connections.html) — The network connections associated with this resource.

- `env`: [ResourceEnvironment](/cdk/api/v2/docs/aws-cdk-lib.interfaces.ResourceEnvironment.html) — 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.

- `fileSystemArn`: string — The ARN of the file system.

- `fileSystemId`: string — The ID of the file system, assigned by Amazon EFS.

- `fileSystemRef`: [FileSystemReference](/cdk/api/v2/docs/aws-cdk-lib.interfaces.aws_efs.FileSystemReference.html) — A reference to a FileSystem resource.

- `mountTargetsAvailable`: [IDependable](/cdk/api/v2/docs/constructs.IDependable.html) — Dependable that can be depended upon to ensure the mount targets of the filesystem are ready.

- `node`: [Node](/cdk/api/v2/docs/constructs.Node.html) — The tree node.

- `stack`: [Stack](/cdk/api/v2/docs/aws-cdk-lib.Stack.html) — The stack in which this resource is defined.

## Methods

- `addToResourcePolicy(statement: PolicyStatement): AddToResourcePolicyResult` — Add a statement to the resource's resource policy.

- `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`).

- `grant(grantee: IGrantable, ...actions: string[]): Grant` — Grant the actions defined in actions to the given grantee on this File System resource.

- `grantRead(grantee: IGrantable): Grant` — Grant read permissions for this file system to an IAM principal.

  **Parameters**

  - `grantee` — The principal to grant read to.

- `grantReadWrite(grantee: IGrantable): Grant` — Grant read and write permissions for this file system to an IAM principal.

  **Parameters**

  - `grantee` — The principal to grant read and write to.

- `grantRootAccess(grantee: IGrantable): Grant` — As root user, grant read and write permissions for this file system to an IAM principal.

  **Parameters**

  - `grantee` — The principal to grant root access to.

- `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.

  **Parameters**

  - `mixins` — The mixins to apply.

  **Returns:** This construct for chaining