NodejsFunction packages dependencies incorrectly

NodejsFunction from @aws-cdk/aws-lambda-nodejs which is using Parcel to bundle dependencies does that incorrectly, I’m not sure why. I’ve tried putting function dependencies both at the root of the project and inside function directory.

However, it works correctly when I cd into function directory, run NODE_ENV=production parcel build function.ts" and point NodeJSFunction entry to the built function.

Reproduction Steps

https://github.com/RafalWilinski/cdk-nodejs-function-parcel-bug

const graphql = new NodejsFunction(this, 'yourlambda', {
    entry: './src/graphql-server/function.ts', // Typescript source - does not work
});

But

const graphql = new NodejsFunction(this, 'yourlambda', {
    entry: './src/graphql-server/dist/function.js', // after building using parcel manually - works
});

Error Log

After invocation:

{"errorType":"Error","errorMessage":"Cannot use e \"__Schema\" from another module or realm.\n\nEnsure that there is only one instance of \"graphql\" in the node_modules\ndirectory. If different versions of \"graphql\" are the dependencies of other\nrelied on modules, use \"resolutions\" to ensure only one version is installed.\n\nhttps://yarnpkg.com/en/docs/selective-version-resolutions\n\nDuplicate \"graphql\" modules cannot be used at the same time since different\nversions may have different capabilities and behavior. The data from one\nversion used in the function from another could produce confusing and\nspurious results.","trace":["Error: Cannot use e \"__Schema\" from another module or realm.","","Ensure that there is only one instance of \"graphql\" in the node_modules","directory. If different versions of \"graphql\" are the dependencies of other","relied on modules, use \"resolutions\" to ensure only one version is installed.","","https://yarnpkg.com/en/docs/selective-version-resolutions","","Duplicate \"graphql\" modules cannot be used at the same time since different","versions may have different capabilities and behavior. The data from one","version used in the function from another could produce confusing and","spurious results.","    at e (/var/task/index.js:64:273)","    at L (/var/task/index.js:78:2521)","    at b (/var/task/index.js:78:2330)","    at $ (/var/task/index.js:78:4892)","    at ee (/var/task/index.js:78:4923)","    at new H (/var/task/index.js:78:4713)","    at H (/var/task/index.js:78:4692)","    at Object.parcelRequire.Y3NB.../polyfills/objectValues.mjs (/var/task/index.js:96:11150)","    at f (/var/task/index.js:1:468)","    at p (/var/task/index.js:1:544)"]}

Environment

• CLI Version : 1.38
• Framework Version: 1.38
• OS : Mac OS
• Language : English

---

This is 🐛 Bug Report

[jogold]

This is apparently a bug when bundling graphql which can only be solved by setting NODE_ENV=production. Setting env vars is currently not supported unfortunately but will be after #7898 and refactoring of aws-lambda-nodejs.

[jogold]

@jogold can you take a look?

Seems to be related to an issue in graphql, there’s some discussion about it at https://github.com/graphql/graphql-js/issues/2801.

@seawatts you can also exclude it from bundling with:

bundling: {
  nodeModules: ['graphql'],
},

see also https://github.com/aws/aws-cdk/tree/master/packages/%40aws-cdk/aws-lambda-nodejs#install-modules