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What's trying to read the file, and how?

@little-cartoon-10569 My project structure is like this:

- project
    ...
    - infra
        - Pulumi.yaml
        - tsconfig.json
        ...
    - src
       ...
   - package.json
   - tsconfig.json

in my package.json

{
  ...
  "devDependencies": {
    "@pulumi/aws": "^4.0.0",
    "@pulumi/pulumi": "^3.0.0",
     ...
  },
  "main": "infra/index.ts",
  "dependencies": {
    "axios": "^0.21.1"
  }
}

infra/index.ts

import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";

const stack = pulumi.getStack();

const name = `test-${stack}`;
const lambdaRole = new aws.iam.Role(`${name}-role`, {
  assumeRolePolicy: {
    Version: "2012-10-17",
    Statement: [
      {
        Action: "sts:AssumeRole",
        Principal: {
          Service: "<http://lambda.amazonaws.com|lambda.amazonaws.com>",
        },
        Effect: "Allow",
        Sid: "",
      },
    ],
  },
});

const lambdaRoleAttachment = new aws.iam.RolePolicyAttachment(
  `${name}-role-attachment`,
  {
    role: lambdaRole,
    policyArn: aws.iam.ManagedPolicy.AWSLambdaBasicExecutionRole,
  },
);

const lambda = new aws.lambda.CallbackFunction(`${name}-lambda`, {
  callback: (foo, bar) => {
    console.log(foo, bar);
  },
});

export const test = lambda.arn;

when i run:

pulumi preview --cwd infra

My error:

Error reading file 'infra/package.json' when computing package dependencies. Error: ENOENT: no such file or directory, open '/infra/package.json'

but when I comment on that function (aws.lambda.CallbackFunction) or use another kind of simple example. That command works fine for me.

Ah, it's an issue getting Pulumi, tsc and npm all seeing the same directory as root? Because there's a ts lambda involved, there are two steps to this. First you can get it working without the lambda (comment out the code); iirc this is straightforward, I think what you've got is good.

My solution is to create the package.json inside infra and run the

npm install

to create the axios dependency. With that duplication of the package.json it works fine for me. my structure would look like this:

- project
    ...
    - infra
        - Pulumi.yaml
        - package.json
        - tsconfig.json
        ...
    - src
       ...
   - package.json
   - tsconfig.json

in

infra/package.json

{
  "dependencies": {
    "axios": "^0.21.1"
  }
}

I hope that at some point that issue is solved. The symbolic link did not work as expected. But hey, if you find a better, more effective solution, I would appreciate it.

🙂 I'm not very knowledgeable about the ins and outs of why this lambda and why not that event rule, and all that sort of stuff. It should be possible though, since iirc CallbackFunction is a wrapper around Function, with some nice mixins..

hopefully someone can make this work without duplicating the package.json and share a simple example with us 🙏

There is a case to be made to have a separate pacakge.json specifically for the lambda. It should need the aws-sdk and not much else...?

I have a case where you want to separate the infrastructure from the application code. Basically have two directories: Infra and src in infra have the files of pulumi

- Pulumi.yaml
- index.ts
...

where the index.ts use the

aws.lambda.CallbackFunction

in the root you must have the

package.json

with all the dependencies of pulumi. and when this command is run:

pulumi preview --cwd infra

works correctly. If you try to create a project with that structure, it will surely give you that error that I get. But it is when the

aws.lambda.CallbackFunction

is used because with another example that this one in the documentation works well that folder and file structure

If you check the code for CallbackFunction you may find that it hardcodes the compile directory for ts-node or tsc. It's an opinionate implementation. You could implement it yourself and use different directories, to work around that constranit.