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How have you declared the module in `types/index.d.ts` ?

This is the code:
```declare module "@bref.sh/layers" {
	function fpmLayerArn(
		region: string,
		version: string,
		architecture?: string,
	): string;
}```

It looks like pulumi only uses the settings inside `compilerOptions`:
<https://github.com/pulumi/pulumi/blob/79271cf543dc6b02baeb560e90c97d52258c7eba/sdk/nodejs/cmd/run/run.ts#L260-L275>

Nah, I tried `compilerOptions.rootDirs` and `compilerOptions.typeRoots` and still erroring :confused:

Also, forced the env variables using:
`PULUMI_NODEJS_TYPESCRIPT=true PULUMI_NODEJS_TSCONFIG_PATH=tsconfig.json pulumi up` and it doesn’t work

It is strange, it follows some rules though, like `strict` and `noImplicitAny` :confused:

I think the issue is with the module you've declared in `types/index.d.ts` and not your TS configuration. Also I see that the original source contains <https://github.com/brefphp/layers.js/blob/main/layers.js#L23-L30|JSDoc> for that function which should provide the type hints that your module is trying to provide. Are you simply trying to add type-safety for that function or trying to fix some other problem?

No, i’m just trying to import it, and TS fails because it doesn’t have a types declaration

```import { fpmLayerArn } from "@bref.sh/layers";
// ...
export const wordpressServer = new aws.lambda.Function(
	"wordpress-server",
	{
		role: wordpressServerRole.arn,
		runtime: "provided.al2",
		layers: [fpmLayerArn("us-east-1", "8.2")],
		s3Bucket: wordpressBucket.bucket,
		s3Key: wordpressCode.key,
		handler: "lambda-handler.php",
		memorySize: 1024,
		sourceCodeHash: wordpressCode.sourceHash.toString(),
	},
	{
		dependsOn: [wordpressServerRole, wordpressBucket, wordpressCode],
	},
);```

I think I’ll go with `noImplicitAny` for now. I’ll try to look into this in the future though. Thanks for helping me out here!

So I was wrong about it not having to do with your `tsconfig.json` file. Your module declaration is indeed correct. You might try `include: ["***/**.ts"]` in your config.

I just ran into this issue. See <https://github.com/TypeStrong/ts-node#missing-types> for more details. but the TL;DR is to put your types in a structure like

```<project_root>/
-- tsconfig.json
-- typings/
  -- <module_name>/
    -- index.d.ts```
and then in your `tsconfig.json` add the `typings` dir to the `typeRoots` list
```{
  "compilerOptions": {
    "typeRoots" : ["./node_modules/@types", "./typings"]
  }
}```