Amplify not recognizing React app build directory code: MissingBuildArtifacts

[samgates3]

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Amplify Hosting feature

Build settings, Deployments

Is your feature request related to a problem? Please describe:

For a React 18 app

Build fails at the deploy phase, giving the Build artifacts not found error. I had not made any changes to build settings before this issue and have since tried a number of variations I have seen others use from other issues for the baseDirectory path including:

build
/build
./build
/app-name/build
./app-name/build

all give the same error.

Here are my build settings:

Default build image

version: 1
backend:
  phases:
    build:
      commands:
        - npm i -S graphql-ttl-transformer
        - '# Execute Amplify CLI with the helper script'
        - amplifyPush --simple
frontend:
  phases:
    preBuild:
      commands:
        - npm ci
    build:
      commands:
        - npm run build
  artifacts:
    baseDirectory: build
    files:
      - '**/*'
  cache:
    paths:
      - node_modules/**/*

I have also used - ls command after the build to confirm the build directory is created and all the files are there

Describe how you'd like this feature to work

I'd like to see what changes I can make to get this issue resolved.

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[samgates3]

I was finally able to find a solution that worked on discord.

The platform was set to WEB_DYNAMIC somehow.

Using aws cli command: aws amplify update-app <APP_ID> --platform WEB --region <REGION> to set the platform to WEB. Then redeployed and everything worked as it did previously.

I don't know if the platform had always been set to WEB_DYNAMIC or WEB, but I did recently add a new branch for a migration to use NextJS and deployed that (it failed, likely because I will have to migrate to use the newer WEB_COMPUTE platform but that will be an issue for another day) and I wonder if that caused the platform to change if it changed at all?

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