How to convert Pulumi Output to TypeScript Promise?

Question

Pulumi · Accepted Answer

In Pulumi, the `Output` type represents a value that will only be known at deployment time. You cannot directly convert an `Output` to a `Promise` but Pulumi does provide the `apply` function to interact with the value inside Output. However, if you have a scenario where you need to convert the output into a promise, you can use `promise()` method to achieve this. Here's an example of usage where `bucket` is a s3.Bucket object: ```typescript import * as aws from "@pulumi/aws"; const bucket = new aws.s3.Bucket("my-bucket"); // Convert pulumi.Output to a Promise const bucketNamePromise = bucket.id.promise(); bucketNamePromise.then(bucketName => { console.log(`Bucket name is: ${bucketName}`); }); ``` In this code, `bucket.id` returns a `pulumi.Output`, which we can convert to a `Promise` with the `.promise()` method. The `Promise` will resolve with the value of the `Output` at the time the `Promise` is created. Keep in mind though, you should only convert Outputs to Promises if necessary as it defeats the goal of Pulumi's programming model which is designed to not know the values until deployment time. For example, you may tempt to use promise when you need to run a for loop on the Output value, but in Pulumi, you could achieve it by the use of `Output.apply` function.