Merging string[] in Typescript

merging_string_array.ts

interface MyOptions {
  dirs: string[];
  length?: number;
  yaml?: boolean;
  name?: string;
}

const options1: MyOptions = {
  dirs: ['src', 'test'],
  length: 88,
  yaml: true,
}
console.log(options1);

const options2: MyOptions = {
  dirs: ['lib']
}
console.log(options2);

console.log({ ...options1, ...options2 });
console.log({ ...options2, ...options1 });

const options3: MyOptions = {
  dirs: ['bin', 'lib'],
  name: 'options3'
}
console.log(options3);

console.log({ ...options1, ...options3 });
console.log({ ...options3, ...options1 });

const plugins = [
  'plugin:import/typescript',
  'prettier',
  'plugin:prettier/recommended',
  'eslint:recommended',
  'plugin:@typescript-eslint/eslint-recommended',
  'plugin:@typescript-eslint/recommended',
  'plugin:import/errors',
  'plugin:import/warnings',
  'prettier'
];

console.log(plugins);
console.log([...new Set(plugins)]);