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What error do you get?

You should be able to set compilation flags in `tsconfig.json`.

We just load `ts-node` into the Node process to compile-on-module-load `.ts` files.  It should be reading the `tsconfig.json` to decide what TypeScript compilation flags to pass.

Error is TS7016 Could not find a declaration file for module ‘mssql’.

works when I do `npx tsc -p tsconfig.json`

And to validate, it fails when I remove the content of the `mssql.d.ts` file and issue the same `tsc` command.

tsconfig: ```{
    "compileOnSave": true,
    "compilerOptions": {
        "strict": true,
        "outDir": "bin",
        "target": "es2016",
        "module": "commonjs",
        "moduleResolution": "node",
        "sourceMap": true,
        "experimentalDecorators": true,
        "pretty": true,
        "noFallthroughCasesInSwitch": true,
        "noImplicitReturns": true,
        "forceConsistentCasingInFileNames": true,
        "typeRoots": [
            "node_modules/@types/",
            "./typings/mssql.d.ts"
        ]
    },
    "files": [
        "index.ts", "dummy.ts",
        "typings/mssql.d.ts",
        "mssql-tasks.ts",
        "mssql-serviceuser.ts"
    ]
}
```

Still wondering if a simple `declare module 'mssql';` should work if I’m using `noImplicitAny` as I’m somehow not defining the types explicitly.

There are also a bunch of typescript github issues related to that topic of `noImplicitAny` and those simple  declarations. <https://github.com/Microsoft/TypeScript/issues/15031>

<https://github.com/microsoft/TypeScript/issues/13348>

The long version of the error is: ```TSError: ⨯ Unable to compile TypeScript:
    mssql-tasks.ts(1,22): error TS7016: Could not find a declaration file for module 'mssql'. '/Users/ajaegle/dev/evals/pulumi-tests/testing-dynamic-provider/node_modules/mssql/index.js' implicitly has an 'any' type.
      Try `npm install @types/mssql` if it exists or add a new declaration (.d.ts) file containing `declare module 'mssql';```

It looks like something weird when passing the ts/d.ts files to the runtime and then resulting in the noImplicitAny problem as the module was not declared anywhere.

Let me check this one… <https://github.com/TypeStrong/ts-node#help-my-types-are-missing>

All right. I somehow screwed up the `typeRoots` which must point to a directory similar to `node_modules/@types`.

With the correct folder structure of the typings folder `typings/&lt;module-name&gt;/&lt;jsfilename&gt;.d.ts` and the following `typeRoots` it works:
```
"typeRoots": [
    "node_modules/@types/",
    "./typings/"
]```

What’s the best place to add this to the docs? Is there some JS/TS specific documentation?