The Typescript compiler has trouble locating the definition file for an npm package

Recently, I released an npm package that was written in typescript. However, I have been facing difficulties in getting the definition recognized by typescript (webback and vscode). The only workaround that has worked for me so far is creating a folder with the definition in node_modules/@types

Here is a brief overview of my package setup:

tsconfig.json

{
    "compilerOptions": {
        ...
        "outDir": "./lib/",
        "declaration": true,
        "declarationDir": "./src/",
    }
}

package.json

{
    ...
    "types": "./index.d.ts",
}

index.d.ts

/// <reference path="src/nano-data-binding.d.ts" />

src/nano-data-binding.d.ts

I've kept it in /src because it's autogenerated and I cannot control the path of the import. Also, if I try to use only declare var ... without import export statements to get a script instead of a module.

import { StringOrHTMLElement } from './interfaces/nano-data-binding';
export declare function nanoBind(parent: HTMLElement, ...selectors: StringOrHTMLElement[]): HTMLElement[];
export declare function nanoBindAll(parent: HTMLElement, ...selectors: string[]): HTMLElement[];

Feel free to install the package, maybe there's just a small mistake somewhere. My goal is to have the nanoBind() and nanoBindAll() declared as globals.

Edit

Additional things I tried. None of them seem to work.

package.json - Npm package

{
    ...
    "types": "lib/nano-data-binding.d.ts",
    "typings": "lib/nano-data-binding.d.ts",
    "typescript": {
        "definition": "lib/nano-data-binding.d.ts"
    },
}

tsconfig.json - Local project

{
    ...
    "files": [
        "node_modules/nano-data-binding/lib/nano-data-binding.d.ts"
    ]
}

Answer №1

To update your package.json, simply change the field from types to typings. Remember, you do not need the triple slash directive in this case.

Answer №2

After much trial and error, I have finally stumbled upon a solution that actually works. It seems that simply using index.d.ts at the root level or specifying a custom route in the package.json file of the package is sufficient.

The issue was with my definition. It was lacking a module declaration.

index.d.ts

type StringOrHTMLElement = string | HTMLElement
declare var nanoBind: (parent: HTMLElement, ...selectors: StringOrHTMLElement[]) => HTMLElement[];
declare var nanoBindAll: (parent: HTMLElement, ...selectors: string[]) => HTMLElement[];

declare module 'nano-data-binding' {
    export var nanoBind: (parent: HTMLElement, ...selectors: any[]) => HTMLElement[];
    export var nanoBindAll: (parent: HTMLElement, ...selectors: string[]) => HTMLElement[];
}

And then comes the way it should be imported.

main.ts

import * as ndb from 'nano-data-binding' // Imports script along with definition
require('nano-data-binding') // Disregards the definition

Answer №3

The issue at hand is caused by the inclusion of a typing file in your tsconfig.json. npm packages automatically load typings files when either the types or typings field is specified in your package.json.

If you remove the entry from the files array in your tsconfig.json, the problem should be resolved.

Your solution of adding

declare module 'nano-data-binding' { }
is a way to create custom typings for packages without existing typings.

Technically speaking, when a typings file (d.ts) lacks a top-level import export statement, it is considered an ambient script file with global scope. This is why you need to use declare module '...' to specify which module you are providing typings for.

You can find more information on how to use these custom typings in scenarios like this one in this Stack Overflow thread.

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