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just to confirm that it's set, does your Pulumi.dev.yaml include:
```config:
  aws:region: us-east-1```

also to confirm.. you're using the aws sdk directly?

I think this has something to do with the library being `require`ed in the serialized delete callback of the dynamic provider

this excerpt from the serialized function in the stack:

```
function __f3(__0) {\n  return (function() {\n    with({ __awaiter: __f2, awsSdk: require(\"aws-sdk/lib/aws.js\"), awsRegion: \"us-west-2\", exports: require(\"pulumi-lib-aws/dist/sns/index.js\") }) {\n\nreturn
```

is what triggers the error.

`require(\"pulumi-lib-aws/dist/sns/index.js\")`

Screen Shot 2019-08-23 at 7.16.31 PM.png

can confirm that the require statement is a problem when calling within a dynamic provider, this must be one of the limitations of dynamic providers as mentioned in <https://www.pulumi.com/docs/reference/programming-model/#dynamicproviders>:

<https://www.pulumi.com/docs/tutorials/aws/serializing-functions/>

you should be able to move those statements above the definition of the dynamic provider and achieve the same result

for example:
```import * as pulumi from "@pulumi/pulumi";
import * as AWS from 'aws-sdk';

const awsConfig = new pulumi.Config("aws");
console.log(awsConfig);
const awsRegion = awsConfig.require("region");

const testprovider: pulumi.dynamic.ResourceProvider = {
    async create(inputs) {
        console.log(awsRegion);
        const sns = new AWS.SNS({region: awsRegion});
        return { id: "testing", outs: {} };
    }
}

class testResource extends pulumi.dynamic.Resource {
    constructor(name: string, opts?: pulumi.CustomResourceOptions) {
        super(testprovider, name, {}, opts);
    }
}

const newTestResource = new testResource("name");```