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This suggests you are running a different Pulumi version

<https://www.pulumi.com/docs/get-started/install/migrating-2.0/#remove-synchronous-invokes|https://www.pulumi.com/docs/get-started/install/migrating-2.0/#remove-synchronous-invokes>

strange - I updated to 2.0 on the day it was released

you mean different version in GitHub actions?

What does the code look like around your GetZoneResult?

const zone = route53.getZone({ name: config.apiDomainName });

then I pass zone.name and zone.id as Input&lt;string&gt; params to other ComponentResource

Now you will have to wrap it in Pulumi.output

As per that article and typescript example

 The fact this works is 100% because of an older version of Pulumi 

Maybe something in Pqckage-lock or node_modules

"@pulumi/pulumi": {
            "version": "1.13.1",

seems you're right - I have this in package lock

though in package.json I have
{
    "name": "backend-stacks",
    "devDependencies": {
        "@types/node": "^10.0.0"
    },
    "dependencies": {
        "@pulumi/pulumi": "^2.0.0",
        "@pulumi/aws": "^2.0.0",
        "@pulumi/awsx": "^0.20.0"
    }
}

Yeah this suggests that even though you updated package.json, you never actually upgraded the node modules that it uses

You will see the error in GitHub Actions as that creates the environment fresh each time

basically I just wrapped it in a promise
route53.getZone({ name: config.apiDomainName }).then(zone =&gt; {})