# Contentstack - TypeScript generation library

This library helps to generate TypeScript type definition for the content types available in a Stack.

## Installation

`$ npm install @contentstack/types-generator`

## Migration

Refer to the [Migration Guide](https://github.com/contentstack/types-generator/blob/main/MIGRATION.md) version 3 if you are migrating from version 2 or older.

## Usage

### In NodeJs

`require("@contentstack/types-generator")` for Common JS (CJS)

OR

`import {<< required method >>} from "@contentstack/types-generator"` for ECMAScript Modules (ESM)

### In Web application

`import {<< required method >>} from "@contentstack/types-generator/dist/web"`

## Usage Guide

#### 1. `generateTS()` (Available for both NodeJS and Web application)

This is an asynchronous method which generates Typescript type definition of the content types available in a Stack using given inputs. Use this method for `REST API`.

**Input:**

| Property Name        | Description                                                                        | Data type | Accepted values                                                               | Mandatory | Default value |
| -------------------- | ---------------------------------------------------------------------------------- | --------- | ----------------------------------------------------------------------------- | --------- | ------------- |
| token                | Unique identifier used for authorization                                           | String    |                                                                               | Yes       |               |
| tokenType            | Type of token being provided (Currently we are supporting only delivery token)     | String    | delivery                                                                      | Yes       |               |
| apiKey               | Stack API key                                                                      | String    |                                                                               | Yes       |               |
| environment          | Name of the environment (example: development, staging, production)                | String    |                                                                               | Yes       |               |
| region               | Contentstack API region                                                            | String    | US (for AWS NA), EU (for AWS EU), AU (for AWS AU), AZURE_NA, AZURE_EU, GCP_NA | Yes       |               |
| branch               | Stack branch name                                                                  | String    |                                                                               | No        |               |
| prefix               | Optional prefix to add for each interface                                          | String    |                                                                               | No        |               |
| includeDocumentation | To add content type documentation in the generated file                            | boolean   | true, false                                                                   | No        | true          |
| systemFields         | Boolean flag indicating whether to include system-generated fields in the response | boolean   | true, false                                                                   | No        | false         |

**Output:**

Returns a Promise that resolves with data or rejects with an error.

**_If resolved:_**

Type: String

Data: Generated Typescript type definition

**_If rejected:_**

Type: Error Object

Data: An object with `error_message`

**Example usage:** `generateTS()`

```typescript
import { generateTS } from "@contentstack/types-generator"; // Import statement for NodeJS
import { generateTS } from "@contentstack/types-generator/dist/web"; // Import statement for Web application

async function getTypeDef() {
  try {
    const typeDef = await generateTS({
      token: "<< your_delivery_token >>",
      tokenType: "delivery", // Currently we are supporting only delivery token
      apiKey: "<< your_stack_api_key >>",
      environment: "development",
      region: "US",
      branch: "main",
      prefix: "CS",
      includeDocumentation: true,
      systemFields: false,
    });

    // Handle the resolved promise, e.g., process the typeDef
  } catch (error) {
    // Handle the rejected promise
    // error: { error_message: "Unauthorized! Please check the given token and api key" }
  }
}

getTypeDef();
```

**Example output:** `generateTS()`

```typescript
/** This is a description. */
interface BuiltinExample {
  /** Title */
  title: string;
  /** URL */
  url: string;
  /** Group1 */
  group1?: {
    /** Group2 */
    group2?: {
      /** Group3 */
      group3?: {
        /** Number */
        number?: number;
      };
    };
  };
  /** SEO */
  seo?: Seo;
  /** Single line textbox */
  single_line?: string;
  /** Multi line textbox */
  multi_line?: string;
  /** Rich text editor */
  rich_text_editor?: string;
  /** Multiple Single Line Textbox */
  multiple_single_line_textbox?: string[];
  /** Markdown */
  markdown?: string;
  /** Multiple Choice */
  multiple_choice?: ("Choice 1" | "Choice 2" | "Choice 3")[];
  /** Single Choice */
  single_choice: "Choice 1" | "Choice 2" | "Choice 3";
  /** Modular Blocks */
  modular_blocks?: ModularBlocks[];
  /** Number */
  number?: number;
  /** Link */
  link?: Link;
  /** File */
  file?: File;
  /** Boolean */
  boolean?: boolean;
  /** Date */
  date?: string;
}

interface ModularBlocks {
  block_1: {
    /** Number */
    number?: number;
    /** Single line textbox */
    single_line?: string;
  };
  block_2: {
    /** Boolean */
    boolean?: boolean;
    /** Date */
    date?: string;
  };
  seo_gf: {
    /** Keywords */
    keywords?: string;
    /** Description */
    description?: string;
  };
}
```

#### 2. `graphqlTS()` (Available only for NodeJS)

This is an asynchronous method which generates Typescript type definition of the content types available in a Stack using given inputs for GraphQL. Use this method for `GraphQL`.

**Input:**

| Property Name | Description                                                                               | Data type | Accepted values                                                               | Mandatory |
| ------------- | ----------------------------------------------------------------------------------------- | --------- | ----------------------------------------------------------------------------- | --------- |
| token         | Unique identifier used for authorization. This should be the delivery token of the stack. | String    |                                                                               | Yes       |
| apiKey        | Stack API key                                                                             | String    |                                                                               | Yes       |
| environment   | Name of the environment (example: development, staging, production)                       | String    |                                                                               | Yes       |
| region        | Contentstack API region                                                                   | String    | US (for AWS NA), EU (for AWS EU), AU (for AWS AU), AZURE_NA, AZURE_EU, GCP_NA | Yes       |
| branch        | Stack branch name                                                                         | String    |                                                                               | No        |
| namespace     | Identifies the specific namespace within schema                                           | String    |                                                                               | No        |

**Output:**

Returns a Promise that resolves with data or rejects with an error.

**_If resolved:_**

Type: String

Data: Generated Typescript type definition

**_If rejected:_**

Type: Error Object

Data: An object with `error_message`

**Example usage:** `graphqlTS()`

```typescript
import { graphqlTS } from "@contentstack/types-generator"; // Import statement for NodeJS

async function getTypeDef() {
  try {
    const typeDef = await graphqlTS({
      token: "<< your_delivery_token >>", // Currently we are supporting only delivery token
      apiKey: "<< your_stack_api_key >>",
      environment: "development",
      region: "US",
      branch: "main",
      namespace: "<< your_name_space >>",
    });

    // Handle the resolved promise, e.g., process the typeDef
  } catch (error) {
    // Handle the rejected promise
    // error: { error_message: "Unauthorized! Please check the given token and api key" }
  }
}

getTypeDef();
```