Unlock TypeScript code suggestions for extended objects

In my app, I use a configuration file named conf.ts to consolidate config values from other files for better organization. By merging these values, it becomes more convenient to access them using Conf.MY_LONG_NAMED_VALUE rather than 

Conf.SubCategory.MY_LONG_NAMED_VALUE
.

import {CoreConf} from './conf/game/core.conf';
import {ViewConf} from './conf/view/view.conf';
import {DebugConf} from './conf/game/debug.conf';

/**
 *
 * @namespace Conf
 */
export const Conf: {[index: string] : any} = $.extend({},
    CoreConf,
    DebugConf,
    ViewConf
);

As I transition from JavaScript to TypeScript, I have noticed that while code completion worked in WebStorm for JavaScript (thanks to the JSDoc tag @namespace), TypeScript does not provide autocomplete suggestions for config names within sub categories.

I have considered two solutions - either organizing each config file as an individual object (less structured) or creating an index signature/interface with all config names (more effort). Is there a more efficient way to achieve this?

javascriptjquerytypescriptwebstorm

Answer №1

If you want to create an intersection type between your configurations, you can simply type Conf:

export const Conf: typeof CoreConf & typeof DebugConf & typeof ViewConf

Another option is to utilize Object.assign, which will return an intersection type of all parameter types:

export const Conf = Object.assign({}, CoreConf, DebugConf, ViewConf)

Answer №2

During my investigation of a separate issue, I unexpectedly discovered a third solution using spread syntax:

const mergedConfig = {...baseConfig, ...debugConfig, ...viewConfig}

This approach proved advantageous for me as it helped enforce an Excess Property Check, which was necessary in a different section of my code.

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