Question:

Run bcrypt code automatically when Instantiate a class in typescript in Nodejs

Here are two quick ways to Run bcrypt code automatically when Instantiate a class in typescript in Node.js.

Builder pattern

import { v4 as uuidv4 } from 'uuid';

import bcrypt from 'bcryptjs';

class User {

public userId: string;

public password: string = '';

constructor(public userName: string, public plainPassword: string, public email: string) {

this.userId = uuidv4();

this.userName = userName;

this.email = email.toLowerCase();

this.plainPassword = plainPassword;

}

public async hashPassword(): Promise<void> {

try {

const salt = await bcrypt.genSalt(10);

this.password = await bcrypt.hash(this.plainPassword, salt);

} catch (error) {

throw error;

}

class UserBuilder {

private user?: User;

public initialize(userName: string, plainPassword: string, email: string): UserBuilder {

this.user = new User(userName, plainPassword, email);

return this;

}

public async build(): Promise<User|null> {

if (this.user) {

await this.user.hashPassword();

return this.user;

}

return null;

}

async function clientCode() {

const user = await new UserBuilder()

.initialize('John Doe', 'password', 'name@email.com')

.build();

console.log(user);

}

clientCode();

Factory pattern

import { v4 as uuidv4 } from 'uuid';

import bcrypt from 'bcryptjs';

class User {

public userId: string;

public password: string = '';

private constructor(public userName: string, public plainPassword: string, public email: string) {

this.userId = uuidv4();

this.userName = userName;

this.email = email.toLowerCase();

this.plainPassword = plainPassword;

}

public async hashPassword(): Promise<void> {

try {

const salt = await bcrypt.genSalt(10);

this.password = await bcrypt.hash(this.plainPassword, salt);

} catch (error) {

throw error;

}

// factory method to create a User instance

public static async createUser(userName: string, plainPassword: string, email: string): Promise<User> {

const user = new User(userName, plainPassword, email);

await user.hashPassword();

return user;

}

// Using the factory method

async function clientCode() {

const user = await User.createUser('John Doe', 'password', 'name@email.com');

console.log(user);

}

clientCode();

In essence, both patterns allow you to control the instantiation process, enhancing the readability and maintainability of your code. While these patterns may not offer a direct solution to the absence of async constructors in JavaScript/TypeScript, they effectively address the underlying problem.

Answered by:> rahpuser

Credit:> StackOverflow

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