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Best practice is to throw an exception. See example below:

```const numEc2 = config.requireNumber("numberOfEc2Instances");
if(numEc2 &gt; 5) {
    throw new pulumi.RunError("Configuration variable 'numberOfEc2Instances' is larger than the allowed amount. Please set a value &lt;= 5.");
}```

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This results in a similar output to missing configuration values:

I’ve also added this for posterity: <https://github.com/pulumi/pulumi/issues/4880>

I don't use simple config values but config objects(-&gt; Config.requireObject/requireSecretObject) and define validations using decorators(-&gt; <https://github.com/typestack/class-validator|class-validator> / <https://www.npmjs.com/package/class-transformer-validator|class-transformer-validator> ).

That’s a great pattern as well :point_up: