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How can I use the ouput of a custom resource, as a string in a policy?

 - CustomResource outputs endpoint
 - Need to use that output as such: `url="${customResource.endpoint}"`

In general - the answer is "use `apply`".

For example:

```
policy: cutomResource.endpoint.apply(endpoint =&gt; JSON.stringify({ ... endpoint ... })
```

Depending on exactly what you are doing - there may be easier options.

I just want the output (which is a url), so I can pass it on to another policy

Context:

```
const exampleApiOperationPolicy = new azure.apimanagement.ApiOperationPolicy("test-policy", {
    apiManagementName: homePageOperation.apiManagementName,
    apiName: homePageOperation.apiName,
    operationId: homePageOperation.operationId,
    resourceGroupName: homePageOperation.resourceGroupName,
    xmlContent: `&lt;policies&gt;
  &lt;inbound&gt;
    &lt;set-backend-service base-url="${staticWebsiteUrl}" /&gt;
  &lt;/inbound&gt;
  &lt;backend&gt;
    &lt;forward-request timeout="30" follow-redirects="true" /&gt;
  &lt;/backend&gt;
&lt;/policies&gt;
`,
});
```

but yeah, in general you should assume that resource properties are asyncronous `Output`s and not actual values

got a link or some demo on how to use that neat `interpolate` function?

Yes - in the case above - `pulumi.interpolate` should do what you want.

<https://www.pulumi.com/docs/reference/programming-model/#outputs-and-strings>

Same error
```
const staticWebsiteUrl = pulumi.interpolate `${staticWebsite.endpoint}`;

....

   xmlContent: `&lt;policies&gt;
  &lt;inbound&gt;
    &lt;set-backend-service base-url="${staticWebsiteUrl}" /&gt;

....
```

```
Calling [toString] on an [Output&lt;T&gt;] is not supported.\n\nTo get the value of an Output&lt;T&gt; as an Output&lt;string&gt; consider either:\n1: o.apply(v =&gt; `pref..
```

The interpolate should go on:

```
xmlContent: pulumi.interpolate`...`
```

Definitely encourage reading the rest of <https://www.pulumi.com/docs/reference/programming-model/#outputs> for details on `Output` more generally.