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you need write it like
```pulumi.interpolate `redis://${redisCluster.cacheNodes.nodes[0].address}:6379` ```
I think

<https://www.pulumi.com/docs/concepts/inputs-outputs/#outputs-and-strings>

Thanks for the quick reply! Unfortunately I get :

&gt;      TSError: ⨯ Unable to compile TypeScript:
&gt;     index.ts(217,56): error TS2345: Argument of type 'string' is not assignable to parameter of type 'TemplateStringsArray'.
&gt;     index.ts(217,91): error TS2339: Property 'nodes' does not exist on type 'Output&lt;ClusterCacheNode[]&gt;'.

If I ask for element at index 0 of `cacheNodes`, then I get :
&gt;  TSError: ⨯ Unable to compile TypeScript:
    index.ts(217,56): error TS2345: Argument of type 'string' is not assignable to parameter of type 'TemplateStringsArray'.

Actually that seems to have worked on the second run :man-shrugging: