Function getConfigVariableResult

Example

// from "@avanio/variable-util-node"
const portResult: Result<string> = await getConfigVariableResult('PORT', [env(), fileEnv()], stringParser, '8080', {showValue: true});

const value: string = portResult.unwrap(); //  get value or throw error
const value: string | undefined = portResult.ok(); //  get value or undefined
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