Function getConfigVariable

get config variable from loaders

Example

// from "@avanio/variable-util-node"
const fileEnv = new FileConfigLoader({fileName: './settings.json', type: 'json'}).getLoader;

const port: Promise<string> = await getConfigVariable('PORT', [env(), fileEnv()], stringParser, '8080', {showValue: true});
// with override key
const port: Promise<string> = await getConfigVariable('PORT', [env('HTTP_PORT', fileEnv())], stringParser, '8080', {showValue: true});
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