🎯 Elevate Your TypeScript Skills with `type-guards-ts`!
Tags: typescript, javascript
Published: 2024-06-26 21:35:24

After the success of our last article on mastering type guards, I decided to create an NPM library to help streamline the process. Introducing `type-guards-ts`, a comprehensive library designed to enhance your TypeScript projects with advanced type guard techniques!

Ready to master TypeScript type guards? Dive into this article to learn how to use `type-guards-ts` and make your code more robust and type-safe.

🔗 Package: https://www.npmjs.com/package/type-guards-ts

## Mastering Type Guards with `type-guards-ts`

### Description

`type-guards-ts` is a powerful TypeScript library that provides a collection of type guard functions to help you perform runtime type checks and type narrowing. This library includes functions to check if a value is of a certain type (e.g., `isBoolean`) and functions to check if a value is not of a certain type (e.g., `isNotBoolean`).

### Installation

To install the package, run the following command:

```bash
npm install type-guards-ts
```

### How to Use

To use the type guards provided by `type-guards-ts`, import the required functions from the package and use them in your TypeScript code.

```typescript
import { isBoolean } from "type-guards-ts";

const value: unknown = true;

if (isBoolean(value)) {
    // TypeScript now knows that `value` is a boolean
    console.log("The value is a boolean.");
} else {
    console.log("The value is not a boolean.");
}
```

### Available Type Guards

#### `is-type`

- `isBigInt`
- `isBoolean`
- `isFunction`
- `isNull`
- `isNumber`
- `isObject`
- `isString`
- `isSymbol`
- `isUndefined`

#### `is-not-type`

- `isNotBigInt`
- `isNotBoolean`
- `isNotFunction`
- `isNotNull`
- `isNotNumber`
- `isNotObject`
- `isNotString`
- `isNotSymbol`
- `isNotUndefined`

### How to Use Key Type Guards

#### `isNull`

Checks if a value is `null`.

```typescript
import { isNull } from "type-guards-ts";

const value: unknown = null;

if (isNull(value)) {
    console.log("The value is null.");
} else {
    console.log("The value is not null.");
}
```

#### `isNotNull`

Checks if a value is not `null`.

```typescript
import { isNotNull } from "type-guards-ts";

const value: unknown = "Some value";

if (isNotNull(value)) {
    console.log("The value is not null.");
} else {
    console.log("The value is null.");
}
```

#### `isString`

Checks if a value is a `string`.

```typescript
import { isString } from "type-guards-ts";

const value: unknown = "Hello, world!";

if (isString(value)) {
    console.log("The value is a string.");
} else {
    console.log("The value is not a string.");
}
```

#### `isNotString`

Checks if a value is not a `string`.

```typescript
import { isNotString } from "type-guards-ts";

const value: unknown = 42;

if (isNotString(value)) {
    console.log("The value is not a string.");
} else {
    console.log("The value is a string.");
}
```

#### `isNumber`

Checks if a value is a `number`.

```typescript
import { isNumber } from "type-guards-ts";

const value: unknown = 42;

if (isNumber(value)) {
    console.log("The value is a number.");
} else {
    console.log("The value is not a number.");
}
```

#### `isNotNumber`

Checks if a value is not a `number`.

```typescript
import { isNotNumber } from "type-guards-ts";

const value: unknown = "42";

if (isNotNumber(value)) {
    console.log("The value is not a number.");
} else {
    console.log("The value is a number.");
}
```

### Conclusion

Type guards in TypeScript provide a powerful way to ensure type safety and improve code reliability. By using `type-guards-ts`, you can handle complex type checks efficiently and avoid common pitfalls associated with dynamic types. Leveraging these techniques will help you write cleaner, more maintainable code, ultimately leading to more robust applications.

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🚀 **Ready to elevate your TypeScript skills? Install `type-guards-ts` today and ensure safe type checks in your projects!**

### Join the Conversation!

What TypeScript challenges have you faced that could benefit from enhanced type safety? Share your experiences and join the conversation!