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# defaults > Easily handle defaults for your options ## Install ```sh npm install defaults ``` ## Usage ```js import defaults from 'defaults'; const calculate = options => { options = defaults(options, { timeout: { before: 100, after: 100 } }); console.log(options); //=> {timeout: {before: 200, after: 100}} // … } // … calculate({timeout: {before: 200}}); ``` ## API ### defaults(options, defaultOptions?) Deeply merges the given options with the specified defaults and returns a new object. The given parameters are deep-cloned and never mutated. #### options Type: `object` The user-provided options. If the value is not a plain object, a new plain object will be used instead. #### defaultOptions Type: `object | undefined` The default options to use when a value is not provided in the `options` object. ## FAQ ### Why use this over [object-spread](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax#spread_in_object_literals)? - Does not overwrite options if they are not defined in the `options` object - Supports deep merging of objects - Provides protection against prototype pollution attacks