Unable to locate custom transformer during gql compile

[yaquawa]

I have read this article https://docs.amplify.aws/cli/plugins/authoring#authoring-custom-graphql-transformers--directives
but no mention on how to use a custom transformer.

I have tried graphql-default-value-transformer, with the following setting in my amplify/backend/api/xx/transform.conf.json

{
    "Version": 5,
    "ElasticsearchWarning": true,
    "transformers": [
        "graphql-default-value-transformer"
    ]
}

But I got this error when I run amplify push

Cannot find module 'xxxxx/~/.npm-global/lib/node_modules/graphql-default-value-transformer'

(I have installed the package both locally and globally.)

How to fix the issue

I found this is an issue of the upstream lib global-dirs.
So I created an issue at here.
sindresorhus/global-directory#21
Amplify team should upgrade the global-dirs once the issue has been fixed.

[edwardfoyle]

@yaquawa did you change the npm global path between when you installed the CLI and when you installed this transformer? Can you check if the package is actually installed at the path that the CLI is looking for it?

[yaquawa]

@edwardfoyle here is the global path of mine.

npm config get prefix
/Users/username/.npm-global

I could find graphql-default-value-transformer in /Users/username/.npm-global/lib/node_modules/graphql-default-value-transformer/.

By the way
the xxxxx in the error message is the path of my project, so the path xxxxx/~/.npm-global/lib/node_modules/graphql-default-value-transformer is an invalid path.

Cannot find module 'xxxxx/~/.npm-global/lib/node_modules/graphql-default-value-transformer'

[yaquawa]

@edwardfoyle

Here is the full error message:

Unable to import custom transformer module(graphql-default-value-transformer).
You may fix this error by editing transformers at /Users/xxx/Documents/htdocs/myproject/amplify/backend/api/testprojectapi/transform.conf.json
✖ An error occurred when pushing the resources to the cloud

Cannot find module '/Users/xxx/Documents/htdocs/myproject/~/.npm-global/lib/node_modules/graphql-default-value-transformer'
Require stack:
- /Users/xxx/.npm-global/lib/node_modules/@aws-amplify/cli/node_modules/import-global/index.js
- /Users/xxx/.npm-global/lib/node_modules/@aws-amplify/cli/node_modules/amplify-provider-awscloudformation/lib/transform-graphql-schema.js
- /Users/xxx/.npm-global/lib/node_modules/@aws-amplify/cli/node_modules/amplify-provider-awscloudformation/lib/push-resources.js
- /Users/xxx/.npm-global/lib/node_modules/@aws-amplify/cli/node_modules/amplify-provider-awscloudformation/lib/amplify-service-migrate.js
- /Users/xxx/.npm-global/lib/node_modules/@aws-amplify/cli/node_modules/amplify-provider-awscloudformation/lib/initializer.js
- /Users/xxx/.npm-global/lib/node_modules/@aws-amplify/cli/node_modules/amplify-provider-awscloudformation/lib/index.js
- /Users/xxx/.npm-global/lib/node_modules/@aws-amplify/cli/lib/commands/push.js
- /Users/xxx/.npm-global/lib/node_modules/@aws-amplify/cli/lib/index.js
- /Users/xxx/.npm-global/lib/node_modules/@aws-amplify/cli/bin/amplify
An error occurred during the push operation: Cannot find module '/Users/xxx/Documents/htdocs/myproject/~/.npm-global/lib/node_modules/graphql-default-value-transformer'
Require stack:
- /Users/xxx/.npm-global/lib/node_modules/@aws-amplify/cli/node_modules/import-global/index.js
- /Users/xxx/.npm-global/lib/node_modules/@aws-amplify/cli/node_modules/amplify-provider-awscloudformation/lib/transform-graphql-schema.js
- /Users/xxx/.npm-global/lib/node_modules/@aws-amplify/cli/node_modules/amplify-provider-awscloudformation/lib/push-resources.js
- /Users/xxx/.npm-global/lib/node_modules/@aws-amplify/cli/node_modules/amplify-provider-awscloudformation/lib/amplify-service-migrate.js
- /Users/xxx/.npm-global/lib/node_modules/@aws-amplify/cli/node_modules/amplify-provider-awscloudformation/lib/initializer.js
- /Users/xxx/.npm-global/lib/node_modules/@aws-amplify/cli/node_modules/amplify-provider-awscloudformation/lib/index.js
- /Users/xxx/.npm-global/lib/node_modules/@aws-amplify/cli/lib/commands/push.js
- /Users/xxx/.npm-global/lib/node_modules/@aws-amplify/cli/lib/index.js
- /Users/xxx/.npm-global/lib/node_modules/@aws-amplify/cli/bin/amplify

[edwardfoyle]

@yaquawa I was able to successfully compile a schema using that transformer plugin and the latest version of the CLI.

Are you using a local installation of the CLI? The CLI only supports global installation

[yaquawa]

@edwardfoyle can you tell me what's your npm config get prefix and your version of amplify?
I was not able to compile it in both local and global installation. I even don't have a package-lock.json becuase I'm using yarn.

I could find graphql-default-value-transformer in /Users/username/.npm-global/lib/node_modules/graphql-default-value-transformer/.

[edwardfoyle]

my npm config get prefix is /usr/local. What does which amplify return for you? It should be equivalent to $(npm config get prefix)/bin/amplify

[yaquawa]

@edwardfoyle here is mine, looks fine?

npm config get prefix
/Users/xx/.npm-global

which amplify
/Users/xx/.npm-global/bin/amplify

[yaquawa]

@edwardfoyle can you tell me your amplify's version?

[yaquawa]

@edwardfoyle I found this is an issue of the upstream lib global-dirs.
So I created an issue at here.
sindresorhus/global-directory#21
Amplify team should upgrade the global-dirs once the issue has been fixed.

[edwardfoyle]

Thanks for digging into that! Marking this as a dependency issue

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