@alexa/ask-expressions-spec

# TypeDeclaration Schema ```txt https://amazonalexa.com/ask/2020/12/TypeDeclaration ``` Represents a type declaration. | Abstract | Extensible | Status | Identifiable | Custom Properties | Additional Properties | Access Restrictions | Defined In | | :------------------ | :--------- | :------------- | :----------- | :---------------- | :-------------------- | :------------------ | :-------------------------------------------------------------------------------- | | Can be instantiated | No | Unknown status | No | Forbidden | Forbidden | none | [TypeDeclaration.json](../../schemas/TypeDeclaration.json "open original schema") | ## TypeDeclaration Type `object` ([TypeDeclaration](typedeclaration.md)) # TypeDeclaration Properties | Property | Type | Required | Nullable | Defined by | | :------------------------------------ | :------------ | :------- | :------------- | :---------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [kind](#kind) | Not specified | Required | cannot be null | [TypeDeclaration](typedeclaration-properties-kind.md "https://amazonalexa.com/ask/2020/12/TypeDeclaration#/properties/kind") | | [name](#name) | `string` | Required | cannot be null | [TypeDeclaration](actiondeclaration-properties-qualifiedname.md "https://amazonalexa.com/ask/2020/12/QualifiedName#/properties/name") | | [extensions](#extensions) | `array` | Optional | cannot be null | [TypeDeclaration](typedeclaration-properties-extensions.md "https://amazonalexa.com/ask/2020/12/TypeDeclaration#/properties/extensions") | | [genericArguments](#genericarguments) | `array` | Optional | cannot be null | [TypeDeclaration](actiondeclaration-properties-genericargumentsdeclaration.md "https://amazonalexa.com/ask/2020/12/GenericArgumentsDeclaration#/properties/genericArguments") | | [properties](#properties) | `array` | Optional | cannot be null | [TypeDeclaration](typedeclaration-properties-properties.md "https://amazonalexa.com/ask/2020/12/TypeDeclaration#/properties/properties") | | [annotations](#annotations) | `array` | Optional | cannot be null | [TypeDeclaration](typedeclaration-properties-annotations.md "https://amazonalexa.com/ask/2020/12/TypeDeclaration#/properties/annotations") | ## kind The expression's identifier. `kind` * is required * Type: unknown ([kind](typedeclaration-properties-kind.md)) * cannot be null * defined in: [TypeDeclaration](typedeclaration-properties-kind.md "https://amazonalexa.com/ask/2020/12/TypeDeclaration#/properties/kind") ### kind Type unknown ([kind](typedeclaration-properties-kind.md)) ### kind Constraints **constant**: the value of this property must be equal to: ```json "TypeDeclaration" ``` ## name A qualified name `name` * is required * Type: `string` ([QualifiedName](actiondeclaration-properties-qualifiedname.md)) * cannot be null * defined in: [TypeDeclaration](actiondeclaration-properties-qualifiedname.md "https://amazonalexa.com/ask/2020/12/QualifiedName#/properties/name") ### name Type `string` ([QualifiedName](actiondeclaration-properties-qualifiedname.md)) ### name Constraints **maximum length**: the maximum number of characters for this string is: `1024` **pattern**: the string must match the following regular expression:  ```regexp ^[A-Za-z][A-Za-z0-9_]*(\.((_[A-Za-z0-9][A-Za-z0-9_]*)|([A-Za-z][A-Za-z0-9_]*)))*$ ``` [try pattern](https://regexr.com/?expression=%5E%5BA-Za-z%5D%5BA-Za-z0-9_%5D*$%5C.\(\(_%5BA-Za-z0-9%5D%5BA-Za-z0-9_%5D*$%7C$%5BA-Za-z%5D%5BA-Za-z0-9_%5D*$\)\)*%24 "try regular expression with regexr.com") ### name Examples ```json "com.amazon.alexa.schema.String" ``` ```json "foo" ``` ## extensions The set of types being extended. `extensions` * is optional * Type: `object[]` ([TypeReference](actiondeclaration-properties-typereference.md)) * cannot be null * defined in: [TypeDeclaration](typedeclaration-properties-extensions.md "https://amazonalexa.com/ask/2020/12/TypeDeclaration#/properties/extensions") ### extensions Type `object[]` ([TypeReference](actiondeclaration-properties-typereference.md)) ## genericArguments A set of generic arguments for a declaration. `genericArguments` * is optional * Type: `object[]` ([Details](genericargumentsdeclaration-items.md)) * cannot be null * defined in: [TypeDeclaration](actiondeclaration-properties-genericargumentsdeclaration.md "https://amazonalexa.com/ask/2020/12/GenericArgumentsDeclaration#/properties/genericArguments") ### genericArguments Type `object[]` ([Details](genericargumentsdeclaration-items.md)) ### genericArguments Constraints **unique items**: all items in this array must be unique. Duplicates are not allowed. ## properties The type's properties. Each item represents a property with a name and a type. `properties` * is optional * Type: `object[]` ([Details](typedeclaration-properties-properties-items.md)) * cannot be null * defined in: [TypeDeclaration](typedeclaration-properties-properties.md "https://amazonalexa.com/ask/2020/12/TypeDeclaration#/properties/properties") ### properties Type `object[]` ([Details](typedeclaration-properties-properties-items.md)) ## annotations `annotations` * is optional * Type: `object[]` ([Call](actiondeclaration-properties-annotations-call.md)) * cannot be null * defined in: [TypeDeclaration](typedeclaration-properties-annotations.md "https://amazonalexa.com/ask/2020/12/TypeDeclaration#/properties/annotations") ### annotations Type `object[]` ([Call](actiondeclaration-properties-annotations-call.md))