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-.ts

currently I have this dynamic provider to handle Cloudflare DNS operations, `pulumi up` and `pulumi destroy` works fine, but `pulumi up --refresh` dies

```
Previewing update (dev):

     Type                               Name        Plan        Info
 ~   pulumi:pulumi:Stack                dliver-dev  refresh     7 messages
 ~   └─ pulumi-nodejs:dynamic:Resource  testdns     refresh     1 error
 
Diagnostics:
  pulumi:pulumi:Stack (dliver-dev):
    Error: Unexpected struct type.: Error: Unexpected struct type.
        at Function.proto.google.protobuf.Value.fromJavaScript (/home/ncsibra/dev/prmrgt-infra/pulumi/dliver/node_modules/google-protobuf/google/protobuf/struct_pb.js:804:13)
        at Function.proto.google.protobuf.Struct.fromJavaScript (/home/ncsibra/dev/prmrgt-infra/pulumi/dliver/node_modules/google-protobuf/google/protobuf/struct_pb.js:870:51)
        at Object.&lt;anonymous&gt; (/home/ncsibra/dev/prmrgt-infra/pulumi/dliver/node_modules/@pulumi/pulumi/cmd/dynamic-provider/index.js:179:55)
        at Generator.next (&lt;anonymous&gt;)
        at fulfilled (/home/ncsibra/dev/prmrgt-infra/pulumi/dliver/node_modules/@pulumi/pulumi/cmd/dynamic-provider/index.js:17:58)
        at process.internalTickCallback (internal/process/next_tick.js:77:7)
 
  pulumi-nodejs:dynamic:Resource (testdns):
    error: Preview failed: Unexpected struct type.
 
error: an error occurred while advancing the preview
```

If I remove the `read` function, it works, but of course not updates the resource

if I modify the create method return from this:
```
    return {
      id: `dns:${zoneID}:${res.result.id}`,
      outs: inputs
    }
```

to this:

```
    return {
      id: `dns:${zoneID}:${res.result.id}`,
      outs: record
    }
```

I got the same "Unexpected struct type" error

Cc <@U84HBHXS8> who should be able to help here. 

<@UDDF5MPU4> from a glance at the protobuf sources, it looks like this could happen if any element in the data you're passing back in `outs` or `props` is a function. However, the data you're returning in `record` doesn't seem like it contains any function values. What do you see if you `console.log(JSON.stringify(record))`?

```
{"type":"CNAME","name":"test","content":"<http://test.com|test.com>","ttl":1,"proxied":true}
```
nothing special, just the expected, it does not contains a function

I wonder if `record` has a key `priority` with the value `undefined`. That might also cause this.

Can you try `console.log(JSON.stringify(Object.keys(record)))`?

```
 ["type","name","content","ttl","priority","proxied"]
```
it does

If you don't have nested properties, you can filter out the `undefined`s with this one-liner:

```
const outs = Object.keys(record).filter(k =&gt; record[k] !== undefined).reduce((acc, k) =&gt; ({ ...acc, [k]: record[k] }), {});
```

We should make this easier in the dynamic provider itself.

filed <https://github.com/pulumi/pulumi/issues/2205> to track

thanks <@U84HBHXS8>, it solves the problem