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If the string is in a variable named, say,

instanceType

, you would say either

createNodeGroup(..., instanceType as aws.ec2.InstanceType, ...)

or

createNodeGroup(..., <aws.ec2.InstanceType>instanceType, ...)

. This simply asserts the type, it doesn't actually check that it's a valid instance type. More info here https://www.typescriptlang.org/docs/handbook/basic-types.html#type-assertions.

Yep, that does it. Thank you!