How to convert Pulumi StringOutput to string?

Q: How to convert Pulumi StringOutput to string?

In Pulumi, `Output ` is a type that represents a value that will be resolved asynchronously. This is used for values that are not known until the infrastructure is deployed. For example, the address of a created database is not known until after Pulumi has created it, so it is represented as `Output `. To perform operations on these `Output ` types, Pulumi provides the `apply` method. You can use this method to provide a callback that will be invoked once the value is available. However, note that the result of `apply` is itself an `Output`. In TypeScript, suppose `foo` is a `pulumi.Output `, e.g. a resource name. ```typescript import * as pulumi from "@pulumi/pulumi"; let foo: pulumi.Output ; // Getting a pulumi.Output value out: const bar = foo.apply(fooValue => { console.log(`Inside the apply function: ${fooValue}`); // ... do something with fooValue ... return fooValue; }); ``` In this example, `fooValue` inside of the `apply` function is a `string` and can be used as such. However, `bar` will still be a `pulumi.Output `, because the apply function isn't executed until the infrastructure is actually being deployed, which happens asynchronously. Unfortunately, due to the nature of how Pulumi deploys resources, you cannot directly turn a `pulumi.Output` into a plain string or number as it is dependent on the completion of the asynchronous tasks. If you want to use an Output value in a context where a raw string is needed, you will need to re-architect your code to work with Outputs. Most Pulumi APIs are designed to automatically accept Outputs wherever raw strings are accepted, specifically to make this easier. If there are cases where this is not true, but should be, feel free to [file an issue](https://github.com/pulumi/pulumi/issues).

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Pulumi · Accepted Answer

In Pulumi, `Output` is a type that represents a value that will be resolved asynchronously. This is used for values that are not known until the infrastructure is deployed. For example, the address of a created database is not known until after Pulumi has created it, so it is represented as `Output`. To perform operations on these `Output` types, Pulumi provides the `apply` method. You can use this method to provide a callback that will be invoked once the value is available. However, note that the result of `apply` is itself an `Output`. In TypeScript, suppose `foo` is a `pulumi.Output`, e.g. a resource name. ```typescript import * as pulumi from "@pulumi/pulumi"; let foo: pulumi.Output; // Getting a pulumi.Output value out: const bar = foo.apply(fooValue => { console.log(`Inside the apply function: ${fooValue}`); // ... do something with fooValue ... return fooValue; }); ``` In this example, `fooValue` inside of the `apply` function is a `string` and can be used as such. However, `bar` will still be a `pulumi.Output`, because the apply function isn't executed until the infrastructure is actually being deployed, which happens asynchronously. Unfortunately, due to the nature of how Pulumi deploys resources, you cannot directly turn a `pulumi.Output` into a plain string or number as it is dependent on the completion of the asynchronous tasks. If you want to use an Output value in a context where a raw string is needed, you will need to re-architect your code to work with Outputs. Most Pulumi APIs are designed to automatically accept Outputs wherever raw strings are accepted, specifically to make this easier. If there are cases where this is not true, but should be, feel free to [file an issue](https://github.com/pulumi/pulumi/issues).