typed-config is a very simple and opinionated library for getting config values from the environment in TypeScript. The design goals are:

• Get config values from process.env
• Validate them and provide useful error messages
• Return the values with meaningful types

Install

npm install -S @dmcquay/typed-config

Example usage

You might create a file called config.ts with the following contents.

import typedConfig from '@dmcquay/typed-config'

const config = typedConfig()

export default {
    apiBaseUrl: config.getString('API_BASE_URL', {pattern: /^https?:\/\/\w+$/}),
    enableFeatureX: config.getBoolean('ENABLE_FEATURE_X', false),
    isDev: config.getBoolean('IS_DEV'),
    maxWidgetCount: config.getInteger('MAX_WIDGET_COUNT')
}

API

function getString(key: string, opts: StringOptions = {}): string
function getNumber(key: string, opts: NumberOptions = {}): number
function getInteger(key: string, opts: NumberOptions = {}): number
function getBoolean(key: string, defaultValue?: boolean): boolean

interface IStringOptions {
    pattern?: RegExp
}

interface INumberOptions {
    maxValue?: number,
    minValue?: number
}