> ## Documentation Index
> Fetch the complete documentation index at: https://cdktn.io/docs/llms.txt
> Use this file to discover all available pages before exploring further.
# Go: App
> CDKTN Core API Reference for App in Go.
Represents a cdktn application.
## Initializers
```go theme={null}
import "github.com/open-constructs/cdk-terrain-go/cdktn"
cdktn.NewApp(config AppConfig) App
```
| **Name** | **Type** | **Description** |
| ------------------------------------------------------------------------- | ----------------------------------------------------- | --------------- |
| config | AppConfig | configuration. |
***
### `config`Optional
* *Type:* AppConfig
configuration.
***
## Methods
| **Name** | **Description** |
| ----------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------- |
| ToString | Returns a string representation of this construct. |
| With | Applies one or more mixins to this construct. |
| CrossStackReference | Creates a reference from one stack to another, invoked on prepareStack since it creates extra resources. |
| Synth | Synthesizes all resources to the output directory. |
***
### `ToString`
```go theme={null}
func ToString() *string
```
Returns a string representation of this construct.
### `With`
```go theme={null}
func 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.
#### `mixins`Required
* *Type:* ...github.com/aws/constructs-go/constructs/v10.IMixin
The mixins to apply.
***
### `CrossStackReference`
```go theme={null}
func CrossStackReference(fromStack TerraformStack, toStack TerraformStack, identifier *string) *string
```
Creates a reference from one stack to another, invoked on prepareStack since it creates extra resources.
#### `fromStack`Required
* *Type:* TerraformStack
***
#### `toStack`Required
* *Type:* TerraformStack
***
#### `identifier`Required
* *Type:* \*string
***
### `Synth`
```go theme={null}
func Synth()
```
Synthesizes all resources to the output directory.
## Static Functions
| **Name** | **Description** |
| ------------------------------------------------------------- | ----------------------------- |
| IsConstruct | Checks if `x` is a construct. |
| IsApp | *No description.* |
| Of | *No description.* |
***
### `IsConstruct`
```go theme={null}
import "github.com/open-constructs/cdk-terrain-go/cdktn"
cdktn.App_IsConstruct(x interface{}) *bool
```
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.
#### `x`Required
* *Type:* interface\{}
Any object.
***
### `IsApp`
```go theme={null}
import "github.com/open-constructs/cdk-terrain-go/cdktn"
cdktn.App_IsApp(x interface{}) *bool
```
#### `x`Required
* *Type:* interface\{}
***
### `Of`
```go theme={null}
import "github.com/open-constructs/cdk-terrain-go/cdktn"
cdktn.App_Of(construct IConstruct) App
```
#### `construct`Required
* *Type:* github.com/aws/constructs-go/constructs/v10.IConstruct
***
## Properties
| **Name** | **Type** | **Description** |
| ------------------------------------------------------------------------------------------ | ------------------------------------------------------------- | --------------------------------------------------------------- |
| Node | github.com/aws/constructs-go/constructs/v10.Node | The tree node. |
| HclOutput | \*bool | *No description.* |
| Manifest | Manifest | *No description.* |
| Outdir | \*string | The output directory into which resources will be synthesized. |
| SkipBackendValidation | \*bool | Whether to skip backend validation during synthesis of the app. |
| SkipValidation | \*bool | Whether to skip all validations during synthesis of the app. |
| TargetStackId | \*string | The stack which will be synthesized. |
***
### `Node`Required
```go theme={null}
func Node() Node
```
* *Type:* github.com/aws/constructs-go/constructs/v10.Node
The tree node.
***
### `HclOutput`Required
```go theme={null}
func HclOutput() *bool
```
* *Type:* \*bool
***
### `Manifest`Required
```go theme={null}
func Manifest() Manifest
```
* *Type:* Manifest
***
### `Outdir`Required
```go theme={null}
func Outdir() *string
```
* *Type:* \*string
The output directory into which resources will be synthesized.
***
### `SkipBackendValidation`Required
```go theme={null}
func SkipBackendValidation() *bool
```
* *Type:* \*bool
Whether to skip backend validation during synthesis of the app.
***
### `SkipValidation`Required
```go theme={null}
func SkipValidation() *bool
```
* *Type:* \*bool
Whether to skip all validations during synthesis of the app.
***
### `TargetStackId`Optional
```go theme={null}
func TargetStackId() *string
```
* *Type:* \*string
The stack which will be synthesized.
If not set, all stacks will be synthesized.
***