all files / lib/elements/ Button.js

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class Button {
  constructor({ type, title, url = '', payload = '' }) {
    const buttonTypes = [
      'web_url',
      'postback',
      'phone_number',
      'account_link',
      'account_unlink',
    ];
 
    if (buttonTypes.indexOf(type) === -1) {
      throw new Error('Invalid button type provided.');
    }
 
    if (title.length > 20) {
      throw new Error('Title cannot be longer 20 characters.');
    }
 
    this.type = type;
    this.title = title;
    this.url = url;
    this.payload = payload;
 
    const button = {
      type: this.type,
      title: this.title,
    };
 
    if (this.url) {
      button.url = this.url;
    }
 
    if (this.payload) {
      button.payload = this.payload;
    }
 
    return button;
  }
}
 
export default Button;