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Remove that quotes on “foo”

^, it's a JS object declaration

new aws.Provider(`my-provider`, {
    ...
    defaultTags: {
        foo: "bar"
    }
});

No, that’s not it: this returns a similar error:

Object literal may only specify known properties, and 'foo' does not exist in type 'Input<ProviderDefaultTags>'.

This looks like what it’s expecting: https://www.pulumi.com/docs/reference/pkg/aws/provider/#providerdefaulttags

oh it wants the tags property maybe? so:

defaultTags: {
   tags: {
       foo: "bar"
   },
}

That was it. Thank you! This makes sense when reading the source code for the Provider DefaultTags type… it wasn’t clear that there was an additional layer of structure from the error message or the in-browser type hints.