Support for TypeScript integrations was significantly expanded and improved with the release of v17 of the Zapier CLI and platform. This document covers how to create, use, and test TypeScript integrations.

​
Getting Started

The TypeScript+ESM templates generated with zapier init provide the configuration needed to get started with TypeScript integrations. If you are adding TypeScript support to an existing app, you can check the Structure of a TS Integration section below for more details information about compiler settings, using the zapier-platform-core library, and how to compose Triggers, Creates, and Searches together with TypeScript. As of the 17.4.0 Platform release, all authentication templates support the --language flag on the zapier init command, which can be set to typescript or javascript. Note that all TypeScript templates now default to ESM. For example, for Basic Auth: 
$ zapier init my-app --template basic-auth --language typescript
$ cd my-app
$ npm install
This will create a new app in ./my-app with the following structure, and install the dependencies. 
my-app/
├── src/
│   ├── authentication.ts
│   ├── index.ts
├── package.json
└── tsconfig.json
To add triggers, creates, and searches, you can then run zapier scaffold as needed. zapier scaffold will automatically detect you’re using TypeScript, and create the correct code accordingly: 
$ zapier scaffold trigger contact
$ zapier scaffold create contact

​
Differences from JS Integrations

There are a few important differences between how TypeScript and JavaScript integrations are implemented that are worth noting.
  • The define helper functions are important to wrap your App, Triggers, Creates, Searches, and Input Field definitions.
  • Code is kept in the src/ directory and compiled to dist/. The root of the integration now becomes ./src/index.ts.
  • Modern import/export syntax is used instead of Node’s require/module.exports assignments.
  • We recommend testing with Vitest, a drop-in replacement for Jest that is faster and has better ESM+TypeScript support.

​
Input Fields

The defineInputFields helper function should be used to define the inputs for all of Triggers, Creates, and Searches. This helper will automatically infer the types of all of the input fields specified. This looks like: 
import {
  defineInputFields,
  defineXyz, // i.e. defineTrigger, defineCreate, defineSearch.
  type XyzPerform, // Different per action+perform type.
  type InferInputData,
} from "zapier-platform-core";

const inputFields = defineInputFields([
  // Input fields definition here.
]);

const perform = (async (z, bundle) => {
  // Bundle.inputData typed from inputFields.
  // perform requests & app logic here.
}) satisfies XyzPerform<InferInputData<typeof inputFields>>;

export default defineXyz({
  // ... Other details: key, display, noun, etc.
  operations: { inputFields, perform }, // Composed here.
});
This is a departure from the previous approach of typically defining the inputs and sometimes perform functions inside of the top-level exported action.

​
Inferring Input Data from Input Fields

The InferInputData type can derive the shape of the input data from input fields defined with defineInputFields. This is useful because it provides the correct types for the bundle.inputData property to give to the various perform functions. 
import { defineInputFields, type InferInputData } from "zapier-platform-core";

const inputFields = defineInputFields([
  { key: "a", type: "number", required: true },
  { key: "b", type: "string", required: false },
]);

type InputData = InferInputData<typeof inputFields>;
//   ^? { a: number; b?: string }

​
Reusing Input Fields

Input Fields are frequently reused across triggers, creates, and searches. To make this easier, there is also a singular defineInputField helper that can be used to define an input field. These can be put somewhere in the src/ directory, and then imported by the actions that need them. 
// ./src/inputFields.ts
import { defineInputField } from "zapier-platform-core";

export const SOME_COMMON_FIELD = defineInputField({
  key: "someKey",
  type: "boolean",
  required: true,
});

// ./src/triggers/someTrigger.ts
import { defineInputFields, type InferInputData } from "zapier-platform-core";
import { SOME_COMMON_FIELD } from "../inputFields";

const inputFields = defineInputFields([
  SOME_COMMON_FIELD,
  { key: "someOtherKey", type: "string", required: true },
]);

type InputData = InferInputData<typeof inputFields>;
//   ^? { someKey: boolean; someOtherKey: string }

​
Dynamic Input Fields

Inputs fields can be dynamic, meaning they are functions that get executed and can return zero, one, or more input fields determined at runtime. This is useful when the input fields are dependent on the values of other input fields, or input field definitions are fetched and prepared from your API, like is the case for CRM and Database APIs. The example below shows a dynamic input field that is used to optionally include a custom subject field when a prior boolean input field is set to true. 
import {
  defineInputField,
  defineInputFields,
  type InferInputData,
} from "zapier-platform-core";

const customSubjectField = defineInputField((z, bundle) => {
  if (bundle.inputData.useCustomSubject as boolean) {
    return defineInputFields([
      { key: "customSubject", type: "string", required: true },
    ]);
  }
  return defineInputFields([]); // IMPORTANT: All returns must be typed.
});

const inputFields = defineInputFields([
  { key: "useCustomSubject", type: "boolean", required: true },
  customSubjectField,
]);

type InputData = InferInputData<typeof inputFields>;
//   ^? { useCustomSubject: boolean; customSubject?: string }
Inside of dynamic input field functions, bundle.inputData will not have type information for its sibling input fields. We recommend casting referenced fields to their known types. For example above, note inputData.useCustomSubject as boolean.

​
Known vs Unknown Fields

The example above shows a known dynamic input field, where the key and type are known ahead of time, and the function’s logic is used to include it or not, based on other fields. These sorts of input fields can be captured by the type system and included in the bundle.inputData property. Input fields returned from input functions are always considered optional, even if they have required: true in their definition, as they cannot be guaranteed to be present. When fields cannot be known ahead of time, the input function can return completely unknown input fields. This is useful when the input fields are derived from data returned from an API. In this case, known inputs are preserved, but the bundle.inputData property will consider any other properties as unknown. 
// Unknown dynamic input fields example

import {
  defineInputField,
  defineInputFields,
  type InferInputData,
  type PlainInputField,
} from "zapier-platform-core";

/** Example API field type, differs from Zapier Fields */
type ApiField = {
  id: string;
  label: string;
  type: "Text" | "Number" | "Boolean";
};

/** Fetch and prepare multiple input fields from an API. */
const getItemFields = defineInputField(async (z, { inputData }) => {
  const response = await z.request<ApiField[]>(
    `${API_URL}/item/${inputData.itemId}/fields`,
  );
  return response.data.map(({ id, label, type }) =>
    defineInputField({
      key: id,
      label,
      type: type.toLowerCase() as "text" | "number" | "boolean",
    }),
  );
});

const inputFields = defineInputFields([
  { key: "itemId", type: "string", required: true, dynamic: "item.id.label" },
  getItemFields,
]);

type InputData = InferInputData<typeof inputFields>;
//   ^? { itemId: string; [x: string]: unknown; }

​
Perform Function Types

There are now dedicated types for all of the different types of Perform Action. These should be imported with type qualified imports. The relevant operation sections inside the define helpers will inform and enforce the correct type for the different perform functions. They are:
  • Polling Triggers:
    • PollingTriggerPerform
  • Webhook Triggers:
    • WebhookTriggerPerform
    • WebhookTriggerPerformList
    • WebhookTriggerPerformSubscribe
    • WebhookTriggerPerformUnsubscribe
  • Creates:
    • CreatePerform
    • CreatePerformResume
  • Searches:
    • SearchPerform
    • SearchPerformResume
They all take at least one type parameter, which is the shape of the the bundle’s inputData property. These Perform types should use satisfies XyzPerform<…> to enforce the correct types but preserve the return type information. 
import type { PollingTriggerPerform } from "zapier-platform-core";

const perform = (async (z, bundle) => {
  // bundle.inputData is typed as { a: number; b?: string }
}) satisfies PollingTriggerPerform<{ a: number; b?: string }>;
In most cases though, input data is derived from the input fields, so InferInputData type can be used: 
import type {
  PollingTriggerPerform,
  InferInputData,
} from "zapier-platform-core";

const perform = (async (z, bundle) => {
  // bundle.inputData is typed as { a: number; b?: string }
}) satisfies PollingTriggerPerform<InferInputData<typeof inputFields>>;
The bundle.inputData property is now typed as the inferred input data from the inputFields array.

​
Structure of a TS Integration

TypeScript integrations follow the same structure and underlying schema as any JavaScript integration. The important difference is that TypeScript apps require important components of integrations to be wrapped with the relevant define helper functions to provide deep type inference about the application. These are:
  • defineApp() – Main function for the top-level app.
  • defineTrigger()/defineCreate()/defineSearch() – For the relevant actions in an integration.
  • defineInputFields() – Wraps an array of input field definitions to simplify handling full typing information about the input fields.

​
src/index.ts

The main entry point of the app becomes src/index.ts. It should import its dependencies, and the default export remains as the Application object. Wrapping it with defineApp will help to check its structure. Otherwise it’s a normal integration, and you register Auth, middleware, hydrators, Triggers, Creates, and Searches all the same way! 
import { defineApp, version as platformVersion } from "zapier-platform-core";
import packageJson from "../package.json" with { type: "json" };

import authentication from "./authentication";
import someCreate from "./creates/some-create";
import someSearch from "./searches/some-search";
import someTrigger from "./triggers/some-trigger";

export default defineApp({
  // IMPORTANT: Note the use of `defineApp`
  version: packageJson.version,
  platformVersion,

  authentication,

  creates: {
    [someCreate.key]: someCreate,
  },
  searches: {
    [someSearch.key]: someSearch,
  },
  triggers: {
    [someTrigger.key]: someTrigger,
  },
});

​
src/authentication.ts

Authentication is defined as a normal object and exported from a file named src/authentication.ts. It uses a satisfies Authentication constraint to check its structure, and does not use a define helper. 
// ./src/authentication.ts

import type { Authentication } from "zapier-platform-core";

import { SCOPES } from "./constants";

export default {
  type: "oauth2",
  test: { url: "https://api.webflow.com/v2/token/authorized_by" },
  connectionLabel: "{{email}}",
  oauth2Config: {
    authorizeUrl: {
      url: "https://webflow.com/oauth/authorize",
      params: {
        client_id: "{{process.env.CLIENT_ID}}",
        response_type: "code",
        scope: SCOPES.join(" "),
        redirect_uri: "{{bundle.inputData.redirect_uri}}",
        state: "{{bundle.inputData.state}}",
      },
    },
    getAccessToken: {
      url: "https://api.webflow.com/oauth/access_token",
      method: "POST",
      params: {
        client_id: "{{process.env.CLIENT_ID}}",
        client_secret: "{{process.env.CLIENT_SECRET}}",
        code: "{{bundle.inputData.code}}",
        grant_type: "authorization_code",
        redirect_uri: "{{bundle.inputData.redirect_uri}}",
      },
    },
  },
} satisfies Authentication; // IMPORTANT: Note the use of `satisfies`

​
src/middleware.ts

Middleware functions are functions exported from src/middleware.ts, that are typed as BeforeRequestMiddleware or AfterResponseMiddleware types. They are registered in the same way as in JavaScript integrations in /src/index.ts. 
// ./src/middleware.ts

import type { BeforeRequestMiddleware } from "zapier-platform-core";

export const addBearerHeader: BeforeRequestMiddleware = (
  request,
  z,
  bundle,
) => {
  if (bundle.authData.access_token && !request.headers?.Authorization) {
    request.headers = {
      ...request.headers,
      Authorization: `Bearer ${bundle.authData.access_token}`,
    };
  }
  return request;
};

​
src/triggers/pollingTrigger.ts

Triggers, Creates, and Searches are now recommended to define their inputs and perform functions as separate objects, and composed together in the define helper that is default export from the file. 
// ./src/triggers/pollingTrigger.ts

import {
  defineInputFields,
  defineTrigger,
  type InferInputData,
  type PollingTriggerPerform,
} from "zapier-platform-core";
import { API_URL } from "../constants.js";

const inputFields = defineInputFields([
  // IMPORTANT: Note `defineInputFields`
  {
    key: "country",
    type: "string",
    required: false,
  },
]);

const perform = (async (z, bundle) => {
  // `bundle.inputData` typed as `{ country?: string }`
  const response = await z.request(`${API_URL}/movies`);
  return response.data;
}) satisfies PollingTriggerPerform<InferInputData<typeof inputFields>>; // IMPORTANT: Note `satisfies`

export default defineTrigger({
  key: "movie",
  noun: "Movie",

  display: {
    label: "New Movie",
    description: "Triggers when a new movie is created.",
  },

  operation: {
    type: "polling",
    inputFields,
    perform,
    sample: {
      id: "1",
      title: "example",
    },
  },
});

​
src/tsconfig.json

The tsconfig.json file configures the TypeScript compiler. Below are settings that are recommended for developing TypeScript integrations. 
{
  "compilerOptions": {
    "target": "ESNext",
    "module": "NodeNext",
    "moduleResolution": "NodeNext",
    "resolveJsonModule": true,
    "esModuleInterop": true,
    "noUncheckedIndexedAccess": true,
    "isolatedModules": true,
    "skipLibCheck": true,
    "outDir": "./dist",
    "rootDir": "./src",
    "strict": true
  },
  "include": ["./src/**/*.ts"],
}