how to use the defaults function from the lodash library in typescript

To use the defaults function from the Lodash library in TypeScript, you need to first install the library as a dependency. You can do that by running the following command in your terminal:

index.ts
npm install lodash
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Once the installation is complete, you can import the defaults function in your TypeScript file as follows:

index.ts
import * as _ from 'lodash';

const defaultConfig = {
  timeout: 5000,
  maxRetries: 3,
  debug: false,
};

const userConfig = {
  timeout: 10000,
  debug: true,
};

const config = _.defaults(userConfig, defaultConfig);
console.log(config); // { timeout: 10000, maxRetries: 3, debug: true }
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In the code above, we imported the entire Lodash library using a wildcard import (* as _). We then defined a defaultConfig object and a userConfig object. We passed these two objects as arguments to the defaults function to merge them together. The resulting object, config, contains all the properties from both defaultConfig and userConfig, with userConfig taking precedence.

Note that you can also import specific Lodash functions instead of the entire library to reduce the amount of code that you need to download and compile. For example, you can import the defaults function directly as follows:

index.ts
import defaults from 'lodash/defaults';

// Usage is the same as before
const config = defaults(userConfig, defaultConfig);
console.log(config); // { timeout: 10000, maxRetries: 3, debug: true }
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