### Interval Installation Steps

Source: https://interval.com/docs/installation

The core steps to get started with Interval involve deploying the Interval Server and then integrating the Interval SDK into your application. The Interval Server manages the rendering of interfaces, while your application contains the business logic and secrets.

```markdown
1. Deploy an instance of Interval Server
2. Create a new TypeScript app or add the Interval SDK to your existing app
```

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

### Interval Server Local Setup

Source: https://interval.com/docs/interval-server

Steps to install and run the Interval Server locally for development. This includes global npm installation, setting up a `.env` file with required environment variables, initializing the database, and starting the server.

```shell
npm i -g @interval/server
```

```shell
DATABASE_URL=<YOUR DATABASE URL>
SECRET=<YOUR SECRET VALUE>
APP_URL=<YOUR APP URL>
AUTH_COOKIE_SECRET=<YOUR AUTH COOKIE SECRET>
WSS_API_SECRET=<YOUR WSS API SECRET>
```

```shell
interval-server db-init
```

```shell
interval-server start
```

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

### Interval Server Setup

Source: https://interval.com/docs/installation

To begin building tools with Interval, you must first deploy an instance of the Interval Server. Refer to the specific documentation for the Interval Server for detailed setup instructions.

```markdown
Follow the instructions in the Interval Server documentation to get started.
```

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

### Interval SDK Integration

Source: https://interval.com/docs/installation

After successfully deploying the Interval Server, you can install the Interval SDK to start building applications. The SDK enables the integration of your app with the Interval platform.

```markdown
Once you have an instance of Interval Server running, you can install the SDK and begin building apps with Interval. Follow the instructions in the Interval SDK documentation to get started.
```

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

### Interval Server Setup (JavaScript)

Source: https://interval.com/docs/index

Sets up the Interval SDK in a JavaScript project, configuring the server endpoint, API key, and the directory for action routes. It then starts the Interval server listener.

```JavaScript
const path =require("path");  
const{ Interval }=require("@interval/sdk");  
  
const interval =newInterval({
  endpoint:"wss://<YOUR INTERVAL SERVER URL>/websocket",  
  apiKey:"<YOUR API KEY>",  
  routesDirectory: path.resolve(__dirname,"routes"),  
});  
  
interval.listen();  
```

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

### Interval Server Setup (TypeScript)

Source: https://interval.com/docs/index

Sets up the Interval SDK in a TypeScript project, configuring the server endpoint, API key, and the directory for action routes. It then starts the Interval server listener.

```TypeScript
import path from"path";  
import{ Interval }from"@interval/sdk";  
  
const interval =newInterval({
  endpoint:"wss://<YOUR INTERVAL SERVER URL>/websocket",// Don't forget the /websocket path!  
  apiKey:"<YOUR API KEY>",  
  routesDirectory: path.resolve(__dirname,"routes"),  
});  
  
interval.listen();  
```

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

### Install Interval SDK

Source: https://interval.com/docs/interval-sdk

Installs the Interval SDK package using npm.

```bash
npm install @interval/sdk
```

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

### ctx.loading.start Examples

Source: https://interval.com/docs/action-context/loading-start

Demonstrates how to use ctx.loading.start with a label and as a shorthand with just a label.

```JavaScript
await ctx.loading.start({
  label:"Reticulating splines...",
});

await ctx.loading.start("Label only shorthand");
```

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

### ctx.loading.start Examples

Source: https://interval.com/docs/action-context/loading-start

Demonstrates how to use ctx.loading.start with a label and as a shorthand with just a label.

```TypeScript
await ctx.loading.start({
  label:"Reticulating splines...",
});

await ctx.loading.start("Label only shorthand");
```

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

### Interval Server Commands

Source: https://interval.com/docs/interval-server

Reference for essential `interval-server` commands. Includes starting the server, initializing the database with options to skip database creation, and the required `DATABASE_URL` format.

```shell
interval-server start
```

```shell
interval-server db-init
```

```shell
interval-server db-init --skip-create
```

```shell
postgresql://username:password@host:port/dbname
```

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

### Initialize Interval SDK (JavaScript)

Source: https://interval.com/docs/writing-actions

Initializes the Interval SDK with endpoint, API key, and routes directory. It then starts listening for actions.

```JavaScript
const { Interval } = require("@interval/sdk");
const path = require("path");

const interval = new Interval({
  endpoint: "wss://<YOUR INTERVAL SERVER URL>/websocket",
  apiKey: "<YOUR API KEY>", // get an API key from the Keys page in your Interval dashboard
  routesDirectory: path.resolve(__dirname, "routes"),
});

interval.listen();
```

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

### Create requirements.txt for Interval SDK

Source: https://interval.com/docs/getting-started/deploy

Creates a `requirements.txt` file to specify the Interval SDK as a dependency. Railway uses this file to install necessary packages during deployment.

```Text
interval-sdk
```

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

### Initialize Interval SDK (TypeScript)

Source: https://interval.com/docs/writing-actions

Initializes the Interval SDK with endpoint, API key, and routes directory. It then starts listening for actions.

```TypeScript
import { Interval } from "@interval/sdk";
import path from "path";

const interval = new Interval({
  endpoint: "wss://<YOUR INTERVAL SERVER URL>/websocket",
  apiKey: "<YOUR API KEY>", // get an API key from the Keys page in your Interval dashboard
  routesDirectory: path.resolve(__dirname, "routes"),
});

interval.listen();
```

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

### Install Railway CLI

Source: https://interval.com/docs/getting-started/deploy

Installs the Railway command-line interface (CLI) globally using either npm or yarn. This tool is essential for interacting with the Railway platform for deployment.

```npm
npm i -g @railway/cli
```

```yarn
yarn global add @railway/cli
```

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

### Initialize Railway Project

Source: https://interval.com/docs/getting-started/deploy

Initializes a new project within Railway. This command guides the user through creating a project and configuring environment variables for the deployment.

```Shell
railway init
```

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

### Run Interval App (npm/yarn)

Source: https://interval.com/docs/getting-started

Provides the commands to run the Interval application locally using either npm or yarn. This starts the development server and connects the app to the Interval platform.

```Shell
npm run dev
```

```Shell
yarn dev
```

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

### io.select.table Usage Example

Source: https://interval.com/docs/io-methods/select-table

Demonstrates how to use the `io.select.table` function to prompt the user to select albums from a list. It shows the data structure required for the table.

```typescript
const albums =await io.select.table("Select your favorites",{
  data:[
{
      album:"Exile on Main Street",
      artist:"The Rolling Stones",
      year:1972,
},
{
      artist:"Michael Jackson",
      album:"Thriller",
      year:1982,
},
{
      album:"Enter the Wu-Tang (36 Chambers)",
      artist:"Wu-Tang Clan",
      year:1993,
},
],
});
```

```javascript
const albums =await io.select.table("Select your favorites",{
  data:[
{
      album:"Exile on Main Street",
      artist:"The Rolling Stones",
      year:1972,
},
{
      artist:"Michael Jackson",
      album:"Thriller",
      year:1982,
},
{
      album:"Enter the Wu-Tang (36 Chambers)",
      artist:"Wu-Tang Clan",
      year:1993,
},
],
});
```

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

### io.select.multiple Usage Example

Source: https://interval.com/docs/io-methods/select-multiple

Demonstrates how to use the io.select.multiple method to prompt a user for multiple selections, including setting default values and help text.

```TypeScript
const condiments =await io.select.multiple("Condiments",{
  options:[
{
      label:"Ketchup",
      value:0,
},
{
      label:"Mustard",
      value:1,
},
{
      label:"Mayo",
      value:2,
},
  ],
  defaultValue:[
{
      label:"Ketchup",
      value:0,
},
{
      label:"Mustard",
      value:1,
},
  ],
  helpText:"What goes on it?",
});

const condimentIds = condiments.map(condiment => condiment.value);
```

```JavaScript
const condiments =await io.select.multiple("Condiments",{
  options:[
{
      label:"Ketchup",
      value:0,
},
{
      label:"Mustard",
      value:1,
},
{
      label:"Mayo",
      value:2,
},
  ],
  defaultValue:[
{
      label:"Ketchup",
      value:0,
},
{
      label:"Mustard",
      value:1,
},
  ],
  helpText:"What goes on it?",
});

const condimentIds = condiments.map(condiment => condiment.value);
```

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

### io.input.date API Documentation

Source: https://interval.com/docs/io-methods/input-date

Provides detailed information about the io.input.date method, including its parameters, return values, and usage examples.

```APIDOC
io.input.date(label: string, options?: { defaultValue?: Date | { year: number; month: number; day: number }; disabled?: boolean; helpText?: string; max?: Date | { year: number; month: number; day: number }; min?: Date | { year: number; month: number; day: number } }): Promise<{ day: number; jsDate: Date; month: number; year: number; defaultValue?: Date | { year: number; month: number; day: number }; disabled?: boolean; helpText?: string; max?: Date | { year: number; month: number; day: number }; min?: Date | { year: number; month: number; day: number }> 

Requests a date input from the user.

Parameters:
  label: The label for the date input.
  options: Optional configuration for the date input.
    defaultValue: Optional. The default date value for the input. Can be a Date object or an object with year, month (1-12), and day.
    disabled: Optional. If true, the input is disabled and cannot be changed from the defaultValue.
    helpText: Optional. Additional context for the input, supporting markdown.
    max: Optional. The latest possible date value. Can be a Date object or an object with year, month (1-12), and day.
    min: Optional. The earliest possible date value. Can be a Date object or an object with year, month (1-12), and day.

Returns:
  A promise that resolves to an object containing the date components: day, jsDate (JavaScript Date object), month (1-12), and year.
```

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

### Interval App Deployment on Render

Source: https://interval.com/docs/deployments/render

Instructions for deploying an Interval application on Render. This involves setting up a Background Worker service, configuring the Node.js environment, and specifying build and start commands.

```APIDOC
Deploy on Render:

1. Create a new Background Worker service in the Render Dashboard.
2. Select your repository (GitHub/GitLab).
3. Set Environment to Node.
4. Configure Build Command (e.g., `yarn build`) and Start Command (e.g., `yarn start`).
5. Choose a paid plan (Starter is recommended).
6. Under Advanced settings, add an Environment Variable:
   - Key: `INTERVAL_KEY`
   - Value: Your Interval Live mode key
7. Click 'Create Background Worker'.
```

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

### Deploy Interval App on Railway

Source: https://interval.com/docs/deployments/railway

Steps to deploy an Interval application on Railway. This involves installing the Railway CLI, initializing a new project, setting the INTERVAL_KEY environment variable, and deploying the application.

```APIDOC
Installation Steps:
1. Install the Railway CLI and log in to Railway.
2. Navigate to your project's directory and run `railway init`.
3. Choose 'Empty Project' and name your app.
4. When prompted about environment variables, enter 'N'.
5. Obtain your Live mode key from the Interval dashboard.
6. Set the environment variable: `railway variables set INTERVAL_KEY=<your live mode key>`.
7. Deploy the app: `railway up`.

Verification:
Check the Railway dashboard logs for a message indicating Interval is connected.
```

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

### Define Interval Action with Name and Description

Source: https://interval.com/docs/best-practices

This example demonstrates how to define an Interval action with a human-readable name and a descriptive explanation, improving discoverability and understanding for team members.

```typescript
import { Action, io } from "@interval/sdk";

export default new Action({
  name: "👥 Transfer membership",
  description: "Removes a membership from one account and applies it to another.",
  handler: async () => {
    /* ... */
  },
});
```

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

### Interval Server Docker Deployment

Source: https://interval.com/docs/interval-server

Information on deploying the Interval Server using its official Docker image. It highlights the image name and the necessity of providing environment variables during deployment, similar to local setup.

```shell
docker.io/alexarena/interval-server:latest
```

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

### Display Table with Data

Source: https://interval.com/docs/io-methods/display-table

Demonstrates how to use the io.display.table function to render a table with predefined data, including column headers and data rows. This example shows basic table creation with album information.

```TypeScript
await io.display.table("Albums",{
  helpText:"Includes the artist and its year of release.",
  data:[
{
      album:"Exile on Main Street",
      artist:"The Rolling Stones",
      year:1972,
},
{
      album:"Thriller",
      artist:"Michael Jackson",
      year:1982,
},
{
      album:"Enter the Wu-Tang (36 Chambers)",
      artist:"Wu-Tang Clan",
      year:1993,
},
],
});

```

```JavaScript
await io.display.table("Albums",{
  helpText:"Includes the artist and its year of release.",
  data:[
{
      album:"Exile on Main Street",
      artist:"The Rolling Stones",
      year:1972,
},
{
      album:"Thriller",
      artist:"Michael Jackson",
      year:1982,
},
{
      album:"Enter the Wu-Tang (36 Chambers)",
      artist:"Wu-Tang Clan",
      year:1993,
},
],
});

```

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

### Safely Shutting Down Deployment (Blue-Green)

Source: https://interval.com/docs/concepts/interval

Demonstrates using `safelyClose` to ensure no service interruptions during deployment shutdowns, illustrated with TypeScript and JavaScript examples.

```typescript
import path from"path";
import{ Interval }from"@interval/sdk";

const interval =new Interval({
  endpoint:"wss://<YOUR INTERVAL SERVER URL>/websocket",
  apiKey:"<YOUR API KEY>",// get an API key from the Keys page in your Interval dashboard
  routesDirectory: path.resolve(__dirname,"routes"),
});

interval.listen();

process.on("SIGINT",()=>{
  interval
.safelyClose()
.then(()=>{
console.log("Safely shut down successfully.");
      process.exit(0);
})
.catch(err =>{
console.error(
"Failed shutting down safely, forcibly closing connection."
);
      interval.immediatelyClose();
      process.exit(0);
});
});
```

```javascript
const path =require("path");
const{ Interval }=require("@interval/sdk");

const interval =new Interval({
  endpoint:"wss://<YOUR INTERVAL SERVER URL>/websocket",
  apiKey:"<YOUR API KEY>",// get an API key from the Keys page in your Interval dashboard
  routesDirectory: path.resolve(__dirname,"routes"),
});

interval.listen();

process.on("SIGINT",()=>{
  interval
.safelyClose()
.then(()=>{
console.log("Safely shut down successfully.");
      process.exit(0);
})
.catch(err =>{
console.error(
"Failed shutting down safely, forcibly closing connection."
);
      interval.immediatelyClose();
      process.exit(0);
});
});
```

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

### CursorPagination Usage Example (TypeScript)

Source: https://interval.com/docs/io-methods/display-table

A TypeScript example demonstrating how to integrate the CursorPagination class within an Interval SDK application to display paginated data from a database using Prisma.

```TypeScript
import{ io, Layout, Page }from"@interval/sdk";  
import prisma from"~/prisma.server";  
import CursorPagination from"./cursor-pagination";  
  
exportdefaultnewPage({
  name:"Tags",  
handler:async()=>{  
// 1️⃣ Initialize the CursorPagination class  
const cursor =newCursorPagination();  
  
returnnewLayout({
      title:"Tags",  
      children:[  
        io.display.table("",{
          defaultPageSize:30,  
          columns:["name","slug"],
getData:async newState =>{  
const{ sortColumn, sortDirection, pageSize, queryTerm }= newState;  
  
// 2️⃣ Update with the new state  
            cursor.update(newState);  
  
const where = queryTerm  
?{
                  name:{ contains: queryTerm },  
}:undefined;  
  
let orderBy;
  
if(sortColumn && sortDirection){
              orderBy ={
[sortColumn]: sortDirection,
};
}
  
// 3️⃣ Use the previous cursor in your query  
const lastResultId = cursor.lastCursor;
  
const data =await prisma.tag.findMany({
              where,
              cursor: lastResultId ?{ id: lastResultId }:undefined,
              skip: lastResultId ?1:0,// skip the cursor
              take: pageSize,
              orderBy,
});
  
const totalRecords =await prisma.tag.count({
              where,
});
  
// 4️⃣ Store the cursor for the data you're returning  
            cursor.add(data[data.length -1]?.id);
  
return{
              data,
              totalRecords,
};
},
}),
],
});
},
});

```

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

### Scheduled Action Example with Input Handling

Source: https://interval.com/docs/writing-actions/scheduled-actions

This example demonstrates how to create a scheduled action that syncs data from an external service. It includes logic to handle missing email addresses by prompting the user for input using Interval's I/O methods.

```TypeScript
import { Action, io } from "@interval/sdk";

export default asyncAction(async () => {
  const data = await fetch("<some_external_url>").then(resp => resp.json());

  for (let row of data) {
    if (!row.email) {
      const [, email] = await io.group([
        io.display.markdown(`
          ## An issue was encountered syncing data.

          No email was present in the row, provide an email before continuing.
`),
        io.input.email("Enter an email:"),
      ]);
      row.email = email;
    }
    // Now every row is guaranteed to have an email
    // We can insert the row into our app's database
  }
});
```

```JavaScript
const { Action, io } = require("@interval/sdk");

module.exports = asyncAction(async () => {
  const data = await fetch("<some_external_url>").then(resp => resp.json());

  for (let row of data) {
    if (!row.email) {
      const [, email] = await io.group([
        io.display.markdown(`
          ## An issue was encountered syncing data.

          No email was present in the row, provide an email before continuing.
`),
        io.input.email("Enter an email:"),
      ]);
      row.email = email;
    }
    // Now every row is guaranteed to have an email
    // We can insert the row into our app's database
  }
});
```

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

### Initialize Interval App (JavaScript)

Source: https://interval.com/docs/getting-started

Imports necessary modules (path, Interval, dotenv) and initializes the Interval SDK with server endpoint, API key, and routes directory. It then establishes a persistent connection to the Interval server.

```JavaScript
const path =require("path");
const{ Interval }=require("@interval/sdk");
require("dotenv").config();

const interval =new Interval({
  endpoint:"wss://<YOUR INTERVAL SERVER URL>/websocket",
  apiKey: process.env.INTERVAL_KEY,
  routesDirectory: path.resolve(__dirname,"routes"),
});

// Establishes a persistent connection between Interval and your app.
interval.listen();
```

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

### ctx.loading.start API Documentation

Source: https://interval.com/docs/action-context/loading-start

Details the parameters and return value for the ctx.loading.start function, used to display loading indicators.

```APIDOC
ctx.loading.start(options?: {
  label?: string;
  description?: string;
  itemsInQueue?: number;
}): Promise<null>

// Parameters:
// label: Primary label for the loading indicator.
// description: Secondary label providing additional context for the loading indicator.
// itemsInQueue: Number of "items" your action needs to work through to complete loading. Subsequently calling `ctx.loading.completeOne` (e.g. within a loop) updates the indicator’s progress.
//
// Returns:
// null
```

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

### io.input.boolean Usage

Source: https://interval.com/docs/io-methods/input-boolean

Requests a boolean value from the user. This method is used to get a true/false answer to a question.

```TypeScript
const shouldSubscribe = await io.input.boolean("Subscribe to our newsletter?");
```

```JavaScript
const shouldSubscribe = await io.input.boolean("Subscribe to our newsletter?");
```

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

### Initialize Interval App (JavaScript)

Source: https://interval.com/docs/interval-sdk

Initializes the Interval client with server endpoint, API key, and routes directory. The `.listen()` method establishes a connection to the Interval server.

```JavaScript
const path =require("path");
const{ Interval }=require("@interval/sdk");

const interval =new Interval({
  endpoint:"wss://<YOUR INTERVAL SERVER URL>/websocket",// Don't forget the /websocket path!
  apiKey:"<YOUR API KEY>",// get an API key from the Keys page in your Interval dashboard
  routesDirectory: path.resolve(__dirname,"routes"),
});

// This is important! If you don't call listen(), your app won't connect to Interval.
interval.listen();
```

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

### Hello World Action (JavaScript)

Source: https://interval.com/docs/index

Defines a simple 'Hello, world' action using the Interval SDK in JavaScript. It prompts the user for their name using `io.input.text` and returns a personalized greeting.

```JavaScript
const{ Action, io }=require("@interval/sdk");  
  
module.exports =newAction(async( )=>{
const name =await io.input.text("Your name");  
return`Hello, ${name}`;  
});  
```

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

### Initialize Interval App (TypeScript)

Source: https://interval.com/docs/getting-started

Imports necessary modules (path, Interval, dotenv) and initializes the Interval SDK with server endpoint, API key, and routes directory. It then establishes a persistent connection to the Interval server.

```TypeScript
import path from"path";
import{ Interval }from"@interval/sdk";
import"dotenv/config";

const interval =new Interval({
  endpoint:"wss://<YOUR INTERVAL SERVER URL>/websocket",
  apiKey: process.env.INTERVAL_KEY,
  routesDirectory: path.resolve(__dirname,"routes"),
});

// Establishes a persistent connection between Interval and your app.
interval.listen();
```

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

### Display Asynchronous Metadata

Source: https://interval.com/docs/io-methods/display-metadata

An example of using the `io.display.metadata` function to display data asynchronously. The `value` property is an async function that counts users from the database.

```javascript
await io.display.metadata({
  data: [
    {
      label: "Total users",
      value: async () => await db.users.count(),
    },
  ],
});

```

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

### Interval Class Initialization with API Key

Source: https://interval.com/docs/concepts/environments

Demonstrates how to initialize the Interval class using an API key to determine the environment the actions will run in. This is crucial for differentiating between development and production deployments.

```javascript
import Interval from '@interval/sdk';

// For Development environment, use your Personal Development Key
const intervalDev = new Interval({ 
  apiKey: 'YOUR_PERSONAL_DEVELOPMENT_KEY'
});

// For Production environment, use a Live mode Interval API key
const intervalProd = new Interval({ 
  apiKey: 'YOUR_LIVE_MODE_API_KEY'
});
```

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

### Connecting Interval App to Server

Source: https://interval.com/docs/interval-server

Example of how to connect your Interval application to an Interval Server instance using the Interval SDK. It shows how to configure the `endpoint` property, noting the difference between local (`ws://`) and production (`wss://`) URLs.

```javascript
const interval =new Interval({
 apiKey: process.env.INTERVAL_KEY,
 endpoint:"wss://<YOUR INTERVAL SERVER URL>/websocket",// Don't forget the /websocket path!
});

```

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

### Issue Refunds with Loading Indicator (JavaScript)

Source: https://interval.com/docs/getting-started

This JavaScript code snippet demonstrates how to initiate a refund process using the Interval SDK. It includes starting a loading state with a progress indicator, iterating through selected charges, refunding each charge using a helper function, and completing the loading state.

```JavaScript
const{ Action, io, ctx }=require("@interval/sdk");  
const{ getCharges, refundCharge }=require("./payments");  
  
module.exports =newAction(async()=>{  
const customerEmail =await io.input.email(  
"Email of the customer to refund:"  
);  
console.log("Email:", customerEmail);  
  
const charges =awaitgetCharges(customerEmail);  
  
const chargesToRefund =await io.select.table(  
"Select one or more charges to refund",  
{  
      data: charges,  
}  
);  
  
await ctx.loading.start({  
    title:"Refunding charges",  
// Because we specified `itemsInQueue`, Interval will render a progress bar versus an indeterminate loading indicator.  
    itemsInQueue: chargesToRefund.length,  
});  
  
for(const charge of chargesToRefund){  
awaitrefundCharge(charge.id);  
await ctx.loading.completeOne();  
}  
  
// Values returned from actions are automatically stored with Interval transaction logs  
return{ chargesRefunded: chargesToRefund.length };  
});  

```

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

### Display Specific Columns in Table

Source: https://interval.com/docs/io-methods/display-table

This example demonstrates how to display only specific columns ('first_name', 'last_name', 'email') in a table by providing an array of column names to the 'columns' property.

```JavaScript
await io.display.table("Users",{
  data:[
{
      email:"carsta.rocha@example.com",
      phone_number:"(60) 1416-4953",
      birthdate:"1993-08-04",
      first_name:"Carsta",
      last_name:"Rocha",
      image:"https://example.com/photos/21351234.jpg",
      website_url:"https://example.com",
},
{
      email:"irene.morales@example.org",
      phone_number:"625-790-958",
      birthdate:"1982-04-28",
      first_name:"Irene",
      last_name:"Morales",
      image:"https://example.com/photos/8321527.jpg",
      website_url:"https://example.org",
},
],
  columns:["first_name","last_name","email"],
});
```

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

### Initialize Interval SDK

Source: https://interval.com/docs/concepts/interval

Demonstrates how to initialize the Interval SDK with essential configuration like endpoint, API key, and routes directory. This is the primary method for connecting to the Interval server and enabling functionality.

```TypeScript
import path from"path";
import{ Interval }from"@interval/sdk";

const interval =new Interval({
  endpoint:"wss://<YOUR INTERVAL SERVER URL>/websocket",
  apiKey:"<YOUR API KEY>",// get an API key from the Keys page in your Interval dashboard
  routesDirectory: path.resolve(__dirname,"routes"),
});

interval.listen();

```

```JavaScript
const path =require("path");
const{ Interval }=require("@interval/sdk");

const interval =new Interval({
  endpoint:"wss://<YOUR INTERVAL SERVER URL>/websocket",
  apiKey:"<YOUR API KEY>",// get an API key from the Keys page in your Interval dashboard
  routesDirectory: path.resolve(__dirname,"routes"),
});

interval.listen();

```

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

### Initialize Interval App (TypeScript)

Source: https://interval.com/docs/interval-sdk

Initializes the Interval client with server endpoint, API key, and routes directory. The `.listen()` method establishes a connection to the Interval server.

```TypeScript
import path from"path";
import{ Interval }from"@interval/sdk";

const interval =new Interval({
  endpoint:"wss://<YOUR INTERVAL SERVER URL>/websocket",// Don't forget the /websocket path!
  apiKey:"<YOUR API KEY>",// get an API key from the Keys page in your Interval dashboard
  routesDirectory: path.resolve(__dirname,"routes"),
});

// This is important! If you don't call listen(), your app won't connect to Interval.
interval.listen();
```

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

### Shorthand Loading State

Source: https://interval.com/docs/writing-actions/loading

Uses a shorthand syntax to start a loading state by providing only a string for the label, simplifying the process for basic loading indicators.

```TypeScript
import{ Action, ctx }from"@interval/sdk";  
  
exportdefaultnewAction(async()=>{  
await ctx.loading.start("This may take a while");  
// ... arduous logic here  
});  
```

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

### Hello World Action (TypeScript)

Source: https://interval.com/docs/index

Defines a simple 'Hello, world' action using the Interval SDK in TypeScript. It prompts the user for their name using `io.input.text` and returns a personalized greeting.

```TypeScript
import{ Action, io }from"@interval/sdk";  
  
exportdefaultnewAction(async( )=>{
const name =await io.input.text("Your name");  
return`Hello, ${name}`;  
});  
```

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

### Display Specific Columns in Table

Source: https://interval.com/docs/io-methods/select-table

This example demonstrates how to display only specific columns ('first_name', 'last_name', 'email') in a table by providing an array of column names to the 'columns' property.

```JavaScript
await io.select.table("Users",{
  data:[
{
      email:"carsta.rocha@example.com",
      phone_number:"(60) 1416-4953",
      birthdate:"1993-08-04",
      first_name:"Carsta",
      last_name:"Rocha",
      image:"https://example.com/photos/21351234.jpg",
      website_url:"https://example.com",
},
{
      email:"irene.morales@example.org",
      phone_number:"625-790-958",
      birthdate:"1982-04-28",
      first_name:"Irene",
      last_name:"Morales",
      image:"https://example.com/photos/8321527.jpg",
      website_url:"https://example.org",
},
],
  columns:["first_name","last_name","email"],
});
```

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

### TypeScript Example for io.search Type Inference

Source: https://interval.com/docs/io-methods/search

Demonstrates how to use TypeScript with the io.search function to ensure proper type inference for the return type and the renderResult argument.

```TypeScript
const selectedUser =await io.search<User>("Search for a user",{
  renderResult: user =>({
    label: user.name,
    description: user.email,
    image:{
      url: user.avatar,
      size:"small",
},
}),
  onSearch:async query =>{
  return users.filter(user => user.name.includes(query));
},
});
```

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

### Display Object - TypeScript/JavaScript Example

Source: https://interval.com/docs/io-methods/display-object

Demonstrates how to use the io.display.object method to show nested data, such as an array of objects, to the action user. This method is useful for presenting structured information.

```TypeScript
await io.display.object("Example object",{
  data:[
    {
      album:"Exile on Main Street",
      artist:"The Rolling Stones",
      year:1972,
    },
  ],
});
```

```JavaScript
await io.display.object("Example object",{
  data:[
    {
      album:"Exile on Main Street",
      artist:"The Rolling Stones",
      year:1972,
    },
  ],
});
```

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

### Configure Interval API Key

Source: https://interval.com/docs/getting-started

Set your Interval API key in the .env file to link your local project to your Interval dashboard. This key is essential for running your Interval application.

```dotenv
INTERVAL_KEY=<your_name_dev_xxx...>
```

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

### Initialize Interval SDK

Source: https://interval.com/docs/security

Initializes the Interval SDK with your server endpoint and API key, establishing a connection for message passing.

```javascript
const path =require("path");  
const{ Interval }=require("@interval/sdk");  
const databaseClient =require("./db");  
  
const interval =newInterval({
  endpoint:"wss://<YOUR INTERVAL SERVER URL>/websocket",  
  apiKey:"<YOUR API KEY>",// get an API key from the Keys page in your Interval dashboard  
});  
  
interval.listen();  
```

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

### Shorthand Loading State (JavaScript)

Source: https://interval.com/docs/writing-actions/loading

Uses a shorthand syntax to start a loading state by providing only a string for the label, simplifying the process for basic loading indicators.

```JavaScript
const{ Action, ctx }=require("@interval/sdk");  
  
module.exports =newAction(async()=>{  
await ctx.loading.start("This may take a while");  
// ... arduous logic here  
});  
```

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

### Refund User Action with Interval SDK

Source: https://interval.com/docs/getting-started

This code snippet demonstrates how to create an Interval action that prompts the user for a customer's email, fetches their charges using a `getCharges` function, and then displays these charges in a table for selection. It utilizes the Interval SDK's `io.input.email` and `io.select.table` methods.

```TypeScript
import{ Action, io }from"@interval/sdk";  
import{ getCharges }from"./payments";  
  
exportdefaultnewAction(async()=>{  
const customerEmail =await io.input.email(  
"Email of the customer to refund:"  
);  
console.log("Email:", customerEmail);  
  
const charges =awaitgetCharges(customerEmail);  
  
const chargesToRefund =await io.select.table(  
"Select one or more charges to refund",  
{  
      data: charges,  
}  
);  
});  
```

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

### Custom Table Column Rendering

Source: https://interval.com/docs/io-methods/display-table

This example shows how to define custom columns with labels, accessor keys, and renderCell callbacks for advanced formatting, including images, dates, and navigation links.

```JavaScript
await io.display.table("Users",{
  data:[
{
      email:"carsta.rocha@example.com",
      phone_number:"(60) 1416-4953",
      birthdate:"1993-08-04",
      first_name:"Carsta",
      last_name:"Rocha",
      image:"https://example.com/photos/21351234.jpg",
      website_url:"https://example.com",
},
{
      email:"irene.morales@example.org",
      phone_number:"625-790-958",
      birthdate:"1982-04-28",
      first_name:"Irene",
      last_name:"Morales",
      image:"https://example.com/photos/8321527.jpg",
      website_url:"https://example.org",
},
],
  columns:[
{
      label:"Name",
renderCell: row =>`${row.first_name}${row.last_name}`,
},
{
      label:"Phone number",
      accessorKey:"phone_number",
},
{
      label:"Photo",
renderCell: row =>({
        image:{
          url: row.image,
          alt:`${row.first_name}${row.last_name} profile photo`,
          size:"small",
},
}),
},
{
      label:"Birth date",
renderCell: row =>{
const[y, m, d]= row.birthdate.split("-").map(s =>Number(s));
const birthDate =newDate(y, m -1, d);
return{
          label: birthDate.toLocaleDateString(),
          value: birthDate,
};
},
},
{
      label:"Website",
renderCell: row =>({
        label: row.website_url,
        url: row.website_url,
}),
},
{
      label:"Edit action",
renderCell: row =>({
        label:"Edit user",
        route:"edit_user",
        params:{
          email: row.email,
},
}),
},
],
});
```

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

### Custom Table Column Rendering

Source: https://interval.com/docs/io-methods/select-table

This example shows how to define custom columns with labels, accessor keys, and renderCell callbacks for advanced formatting, including images and formatted dates.

```JavaScript
await io.select.table("Users",{
  data:[
{
      email:"carsta.rocha@example.com",
      phone_number:"(60) 1416-4953",
      birthdate:"1993-08-04",
      first_name:"Carsta",
      last_name:"Rocha",
      image:"https://example.com/photos/21351234.jpg",
      website_url:"https://example.com",
},
{
      email:"irene.morales@example.org",
      phone_number:"625-790-958",
      birthdate:"1982-04-28",
      first_name:"Irene",
      last_name:"Morales",
      image:"https://example.com/photos/8321527.jpg",
      website_url:"https://example.org",
},
],
  columns:[
{
      label:"Name",
renderCell: row =>`${row.first_name}${row.last_name}`,
},
{
      label:"Phone number",
      accessorKey:"phone_number",
},
{
      label:"Photo",
renderCell: row =>({
        image:{
          url: row.image,
          alt:`${row.first_name}${row.last_name} profile photo`,
          size:"small",
},
}),
},
{
      label:"Birth date",
renderCell: row =>{
const[y, m, d]= row.birthdate.split("-").map(s =>Number(s));
const birthDate =newDate(y, m -1, d);
return{
          label: birthDate.toLocaleDateString(),
          value: birthDate,
};
},
},
{
      label:"Website",
renderCell: row =>({
        label: row.website_url,
        url: row.website_url,
}),
},
],
});
```