To answer my own question,

pulumi.output

does recursively flatten/lift nested outputs to a single outer

Output

across objects and arrays, however it specifically excludes `pulumi.Resource`s which halt the recursion: https://github.com/pulumi/pulumi/blob/d64448ec3b52cf5d4682a70e2f854c9736a86fd8/sdk/nodejs/output.ts#L447-L450

In my case I convinced myself with:

export const svc = resources.apply((rs) =>
  pulumi
    .output(
      Object.values(rs).map((vs: any) => {
        delete vs['__pulumiResource'];
        return vs;
      }),
    )
    .apply((vs) => vs.filter((v: any) => v.kind === 'Service')),
);

which worked how I wanted after I stripped the nominal type marker property `__pulumiResource`(obviously a hack)

the comment in pulumi source code says:

// Don't unwrap Resources, there are existing codepaths that return Resources through
// Outputs and we want to preserve them as is when flattening.

so I am wondering if there are existing code paths that would help me here... since I really do want to lift a field which is an

Output

so I can use it as part of a predicate in a filter