### Load DevRev Items: Create and Update Todos

Source: https://context7.com/devrev/airdrop-template/llms.txt

Processes DevRev items (todos) and synchronizes them to an external system using create and update functions. It handles item denormalization and interacts with an external HTTP client. Dependencies include '@devrev/ts-adaas' and local modules for HTTP client and data denormalization.

```typescript
import {
  processTask,
  LoaderEventType,
  ExternalSystemItem,
  ExternalSystemItemLoadingParams,
  ExternalSystemItemLoadingResponse
} from '@devrev/ts-adaas';
import { HttpClient } from './external-system/http-client';
import { denormalizeTodo } from './external-system/data-denormalization';

// Create function for new items
async function createTodo({
  item,
  mappers,
  event,
}: ExternalSystemItemLoadingParams<ExternalSystemItem>): Promise<ExternalSystemItemLoadingResponse> {
  const httpClient = new HttpClient(event);
  const todo = denormalizeTodo(item);

  const response = await httpClient.createTodo(todo);

  // Return format options:
  // Success: { id: 'external-id-123' }
  // Error: { error: 'Error message' }
  // Retry: { delay: 5000 } // milliseconds
  return response;
}

// Update function for existing items
async function updateTodo({
  item,
  mappers,
  event,
}: ExternalSystemItemLoadingParams<ExternalSystemItem>): Promise<ExternalSystemItemLoadingResponse> {
  const httpClient = new HttpClient(event);

  // Get external ID from sync mapper
  const syncMapperRecordResponse = await mappers.getByTargetId({
    sync_unit: event.payload.event_context.sync_unit,
    target: item.id.devrev,
  });
  const todoExternalId = syncMapperRecordResponse.data.sync_mapper_record.external_ids[0];

  const todo = denormalizeTodo(item);
  const response = await httpClient.updateTodo(todo);

  return response;
}

processTask({
  task: async ({ adapter }) => {
    const { reports, processed_files } = await adapter.loadItemTypes({
      itemTypesToLoad: [
        {
          itemType: 'todos',
          create: createTodo,
          update: updateTodo,
        },
      ],
    });

    await adapter.emit(LoaderEventType.DataLoadingDone, {
      reports,
      processed_files,
    });
  },
  onTimeout: async ({ adapter }) => {
    await adapter.emit(LoaderEventType.DataLoadingProgress, {
      reports: adapter.reports,
      processed_files: adapter.processedFiles,
    });
  },
});
```

--------------------------------

### HTTP Client for External System API Integration

Source: https://context7.com/devrev/airdrop-template/llms.txt

This TypeScript HTTP client manages API communication with an external system, handling authentication and CRUD operations. It takes an AirdropEvent as input for connection data and provides methods to fetch, create, and update various data types like todos, users, and attachments. The client uses a placeholder implementation for create/update operations.

```typescript
import { AirdropEvent } from '@devrev/ts-adaas';
import { HttpClient } from './external-system/http-client';

// Initialize with event containing connection data
const event: AirdropEvent = {
  payload: {
    connection_data: { key: 'your-api-token' },
    event_type: EventType.ExtractionDataStart
  }
};

const client = new HttpClient(event);

// Fetch todo lists
const todoLists = await client.getTodoLists();
// Returns: [{ id: '1', name: 'Todo List', description: '...', item_count: 2, item_type: 'todos' }]

// Fetch todos
const todos = await client.getTodos();
// Returns: [{ id: 'todo-1', title: 'Todo 1', body: '<p>...</p>', creator: 'user-1', owner: 'user-1', created_date: '1999-12-25T01:00:03+01:00', modified_date: '1999-12-25T01:00:03+01:00' }]

// Fetch users
const users = await client.getUsers();
// Returns: [{ id: 'user-1', name: 'John Doe', email: 'johndoe@test.com', created_date: '1999-12-25T01:00:03+01:00', modified_date: '1999-12-25T01:00:03+01:00' }]

// Fetch attachments
const attachments = await client.getAttachments();
// Returns: [{ id: 'attachment-1', url: 'https://...', file_name: 'favicon1.ico', author_id: 'user-1', parent_id: 'todo-1' }]

// Create todo in external system
const newTodo = {
  id: 'todo-3',
  title: 'New Todo',
  body: '<p>Description</p>',
  creator: 'user-1',
  owner: 'user-1',
  created_date: new Date().toISOString(),
  modified_date: new Date().toISOString()
};
const createResponse = await client.createTodo(newTodo);
// Returns: { error: 'Could not create todo in external system.' } (placeholder implementation)

// Update existing todo
const updatedTodo = { ...newTodo, title: 'Updated Todo' };
const updateResponse = await client.updateTodo(updatedTodo);
// Returns: { error: 'Could not update todo in external system.' } (placeholder implementation)

```

--------------------------------

### Function Factory - Access Extraction and Loading Functions (TypeScript)

Source: https://context7.com/devrev/airdrop-template/llms.txt

Provides centralized access to extraction and loading functions within the DevRev AirSync Snap-in Template. It exports a type-safe registry of available snap-in functions, allowing developers to easily access and use specific functionalities.

```typescript
import { functionFactory } from './function-factory';

// Access extraction function
const extractionFunction = functionFactory.extraction;

// Access loading function
const loadingFunction = functionFactory.loading;

// Type-safe function names
type AvailableFunctions = keyof typeof functionFactory; // 'extraction' | 'loading'
```

--------------------------------

### Denormalize DevRev Item to External System Format

Source: https://context7.com/devrev/airdrop-template/llms.txt

Transforms DevRev normalized items into the format required for external system API calls. This function is crucial for preparing data before creating or updating items in the external system. It takes an 'ExternalSystemItem' as input and returns an 'ExternalTodo' object.

```typescript
import { ExternalSystemItem } from '@devrev/ts-adaas';
import { denormalizeTodo } from './external-system/data-denormalization';
import { ExternalTodo } from './external-system/types';

// DevRev normalized item
const devrevItem: ExternalSystemItem = {
  id: { devrev: 'don:core:dvrv-us-1:devo/ABC:issue/123' },
  data: {
    title: 'Fix bug in payment processor',
    body: '<p>Critical bug affecting checkout</p>',
    creator: 'user-1',
    owner: 'user-2'
  },
  created_date: '2024-01-15T10:00:00Z',
  modified_date: '2024-01-16T14:30:00Z'
};

// Denormalize for external system API
const externalTodo: ExternalTodo = denormalizeTodo(devrevItem);
// Returns: {
//   id: 'don:core:dvrv-us-1:devo/ABC:issue/123',
//   title: 'Fix bug in payment processor',
//   body: '<p>Critical bug affecting checkout</p>',
//   creator: 'user-1',
//   owner: 'user-2',
//   created_date: '2024-01-15T10:00:00Z',
//   modified_date: '2024-01-16T14:30:00Z'
// }

// Use with HTTP client
const httpClient = new HttpClient(event);
await httpClient.createTodo(externalTodo);
```

--------------------------------

### Sync DevRev Data to External System (TypeScript)

Source: https://context7.com/devrev/airdrop-template/llms.txt

This function synchronizes data from DevRev back to an external system, handling both creation and updates. It processes a list of AirdropEvents, triggering specific loading processes for data and attachments based on event types.

```typescript
import { AirdropEvent, EventType } from '@devrev/ts-adaas';
import loading from './functions/loading';

// Example loading events
const loadingEvents: AirdropEvent[] = [
  {
    payload: {
      event_type: EventType.StartLoadingData,
      connection_data: { key: 'api-token-123' },
      event_context: { sync_unit: 'todo-list-1' }
    }
  },
  {
    payload: {
      event_type: EventType.StartLoadingAttachments,
      connection_data: { key: 'api-token-123' },
      event_context: { sync_unit: 'todo-list-1' }
    }
  }
];

// Run loading
await loading(loadingEvents);

// The loading function will spawn workers for:
// 1. Data loading (create/update todos)
// 2. Attachments loading

```

--------------------------------

### External Sync Units Extraction Worker - Fetch and Normalize Todo Lists (TypeScript)

Source: https://context7.com/devrev/airdrop-template/llms.txt

A worker for the DevRev AirSync Snap-in Template that extracts high-level sync units, such as todo lists, from an external system. It fetches data using an HTTP client, normalizes it to the DevRev format, and emits completion or error events.

```typescript
import { processTask, ExtractorEventType, ExternalSyncUnit } from '@devrev/ts-adaas';
import { HttpClient } from './external-system/http-client';
import { normalizeTodoList } from './external-system/data-normalization';

processTask({
  task: async ({ adapter }) => {
    const httpClient = new HttpClient(adapter.event);

    // Fetch todo lists from external system
    const todoLists = await httpClient.getTodoLists();

    // Normalize to DevRev format
    const externalSyncUnits: ExternalSyncUnit[] = todoLists.map(list =>
      normalizeTodoList(list)
    );

    // Emit completion event with extracted units
    await adapter.emit(ExtractorEventType.ExtractionExternalSyncUnitsDone, {
      external_sync_units: externalSyncUnits,
    });
  },
  onTimeout: async ({ adapter }) => {
    await adapter.emit(ExtractorEventType.ExtractionExternalSyncUnitsError, {
      error: { message: 'Failed to extract external sync units. Lambda timeout.' },
    });
  },
});
```

--------------------------------

### Manage Extractor State with Custom Types in TypeScript

Source: https://context7.com/devrev/airdrop-template/llms.txt

This snippet demonstrates how to define and manage custom extractor states by extending the base ExtractorState. It shows initializing a state object with custom properties like todos, users, and attachments, and how to access and update these properties within a worker task using an adapter. This pattern is useful for tracking detailed progress and custom data during data extraction processes.

```typescript
import { ExtractorState, initialExtractorState } from './functions/extraction';

// Define custom state interface
interface CustomExtractorState extends ExtractorState {
  todos: { completed: boolean; page?: number; total?: number };
  users: { completed: boolean; page?: number; total?: number };
  attachments: { completed: boolean; page?: number; total?: number };
  customField?: { lastSyncTime: string };
}

// Initialize state
const state: CustomExtractorState = {
  ...initialExtractorState,
  todos: { completed: false, page: 0, total: 0 },
  users: { completed: false, page: 0, total: 0 },
  attachments: { completed: false, page: 0, total: 0 },
  customField: { lastSyncTime: new Date().toISOString() }
};

// Use in worker
processTask<CustomExtractorState>({
  task: async ({ adapter }) => {
    // Access and update state
    adapter.state.todos.page = 1;
    adapter.state.todos.total = 100;

    // Process items...

    adapter.state.todos.completed = true;
  }
});
```

--------------------------------

### Extract External System Metadata

Source: https://context7.com/devrev/airdrop-template/llms.txt

Extracts and processes external system metadata, including custom fields and type definitions. This worker combines static metadata with potentially dynamic data fetched from an API. It utilizes '@devrev/ts-adaas' for task processing and event emission. Dependencies include '@devrev/ts-adaas' and a local JSON file for static metadata.

```typescript
import { processTask, ExtractorEventType } from '@devrev/ts-adaas';
import staticExternalDomainMetadata from './external-system/external_domain_metadata.json';

processTask({
  task: async ({ adapter }) => {
    adapter.initializeRepos([{ itemType: 'external_domain_metadata' }]);

    // Combine static and dynamic metadata
    const externalDomainMetadata = {
      ...staticExternalDomainMetadata,
      // Add dynamic metadata from API if needed
      // customFields: await httpClient.getCustomFields()
    };

    await adapter.getRepo('external_domain_metadata')?.push([externalDomainMetadata]);
    await adapter.emit(ExtractorEventType.ExtractionMetadataDone);
  },
  onTimeout: async ({ adapter }) => {
    await adapter.emit(ExtractorEventType.ExtractionMetadataError, {
      error: { message: 'Failed to extract metadata. Lambda timeout.' },
    });
  },
});
```

--------------------------------

### Extraction Function - Orchestrate Data Import from External System (TypeScript)

Source: https://context7.com/devrev/airdrop-template/llms.txt

Orchestrates the data extraction process for the DevRev AirSync Snap-in Template using event-driven workers. It processes AirdropEvents and spawns appropriate workers based on event types for various extraction phases like metadata and data extraction.

```typescript
import { AirdropEvent, EventType } from '@devrev/ts-adaas';
import extraction from './functions/extraction';

// Example extraction event
const extractionEvents: AirdropEvent[] = [
  {
    payload: {
      event_type: EventType.ExtractionExternalSyncUnitsStart,
      connection_data: { key: 'api-token-123' },
      event_context: { sync_unit: 'todo-list-1' }
    }
  },
  {
    payload: {
      event_type: EventType.ExtractionDataStart,
      connection_data: { key: 'api-token-123' }
    }
  }
];

// Run extraction
await extraction(extractionEvents);

// The extraction function will spawn workers for:
// 1. External sync units extraction (todo lists)
// 2. Metadata extraction (field definitions)
// 3. Data extraction (todos, users, attachments)
// 4. Attachments extraction
```

--------------------------------

### Data Extraction Worker for DevRev

Source: https://context7.com/devrev/airdrop-template/llms.txt

This TypeScript worker extracts data items (todos, users, attachments) from an external system and normalizes them for DevRev storage. It uses the '@devrev/ts-adaas' library and custom normalization functions. Dependencies include an HTTP client for fetching data and adapter for DevRev integration.

```typescript
import { processTask, ExtractorEventType } from '@devrev/ts-adaas';
import { HttpClient } from './external-system/http-client';
import { normalizeTodo, normalizeUser, normalizeAttachment } from './external-system/data-normalization';

// Define repositories for storing extracted data
const repos = [
  {
    itemType: 'todos',
    normalize: (item: object) => normalizeTodo(item as ExternalTodo),
  },
  {
    itemType: 'users',
    normalize: (item: object) => normalizeUser(item as ExternalUser),
  },
  {
    itemType: 'attachments',
    normalize: (item: object) => normalizeAttachment(item as ExternalAttachment),
  },
];

processTask({
  task: async ({ adapter }) => {
    adapter.initializeRepos(repos);
    const httpClient = new HttpClient(adapter.event);

    // Extract todos
    const todos = await httpClient.getTodos();
    await adapter.getRepo('todos')?.push(todos);
    adapter.state.todos.completed = true;

    // Extract users
    const users = await httpClient.getUsers();
    await adapter.getRepo('users')?.push(users);
    adapter.state.users.completed = true;

    // Extract attachments
    const attachments = await httpClient.getAttachments();
    await adapter.getRepo('attachments')?.push(attachments);
    adapter.state.attachments.completed = true;

    await adapter.emit(ExtractorEventType.ExtractionDataDone);
  },
  onTimeout: async ({ adapter }) => {
    await adapter.emit(ExtractorEventType.ExtractionDataProgress);
  },
});
```

--------------------------------

### Normalize External Data to DevRev Format (TypeScript)

Source: https://context7.com/devrev/airdrop-template/llms.txt

These functions transform data structures from external systems into DevRev's normalized format. They are essential for data ingestion and ensure consistency. The functions handle specific entity types like todo lists, individual todos, users, and attachments, mapping external fields to their DevRev equivalents.

```typescript
import { normalizeTodoList, normalizeTodo, normalizeUser, normalizeAttachment } from './external-system/data-normalization';
import { ExternalTodoList, ExternalTodo, ExternalUser, ExternalAttachment } from './external-system/types';

// Normalize todo list (external sync unit)
const externalTodoList: ExternalTodoList = {
  id: '1',
  name: 'My Project Tasks',
  description: 'Tasks for Q1 project',
  item_count: 15,
  item_type: 'todos'
};
const normalizedList = normalizeTodoList(externalTodoList);
// Returns: { id: '1', name: 'My Project Tasks', description: '...', item_count: 15, item_type: 'todos' }

// Normalize todo item
const externalTodo: ExternalTodo = {
  id: 'todo-1',
  title: 'Implement feature X',
  body: '<p>Complete implementation by EOD</p>',
  creator: 'user-1',
  owner: 'user-2',
  created_date: '2024-01-15T10:00:00Z',
  modified_date: '2024-01-16T14:30:00Z'
};
const normalizedTodo = normalizeTodo(externalTodo);
// Returns: {
//   id: 'todo-1',
//   created_date: '2024-01-15T10:00:00Z',
//   modified_date: '2024-01-16T14:30:00Z',
//   data: {
//     title: 'Implement feature X',
//     body: '<p>...</p>',
//     creator: 'user-1',
//     owner: 'user-2',
//     item_url_field: 'https://external-system.com/todos/todo-1'
//   }
// }

// Normalize user
const externalUser: ExternalUser = {
  id: 'user-1',
  name: 'John Doe',
  email: 'john.doe@company.com',
  created_date: '2023-06-01T08:00:00Z',
  modified_date: '2024-01-10T12:00:00Z'
};
const normalizedUser = normalizeUser(externalUser);
// Returns: {
//   id: 'user-1',
//   created_date: '2023-06-01T08:00:00Z',
//   modified_date: '2024-01-10T12:00:00Z',
//   data: { name: 'John Doe', email: 'john.doe@company.com' }
// }

// Normalize attachment
const externalAttachment: ExternalAttachment = {
  id: 'att-1',
  url: 'https://cdn.example.com/files/document.pdf',
  file_name: 'specification.pdf',
  author_id: 'user-1',
  parent_id: 'todo-1'
};
const normalizedAttachment = normalizeAttachment(externalAttachment);
// Returns: {
//   id: 'att-1',
//   url: 'https://cdn.example.com/files/document.pdf',
//   file_name: 'specification.pdf',
//   author_id: 'user-1',
//   parent_id: 'todo-1'
// }
```

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