Easy steps for importing node modules in TypeScript

I'm currently navigating the world of TypeScript and attempting to incorporate a module that is imported from a node module. I have chosen not to utilize webpack or any other build tools in order to maintain simplicity and clarity.

Here is the structure of my project:

/node_modules    -- contains node modules I want to import in main.ts
/scripts/ts/main.ts
/scripts/main.js -- the transpiled main.ts file
/index.html      -- includes the module script tag for scripts/main.js
/package.json
/tsconfig.json

This is what my tsconfig.json looks like:

{
    "compilerOptions": {
        "target": "ES6",
        "module": "ES2015",
        "strict": true,
        "forceConsistentCasingInFileNames": true,
        "outDir": "scripts",
        "moduleResolution": "Node",
        "experimentalDecorators": true
    },
    "$schema": "https://json.schemastore.org/tsconfig",
    "exclude": [],
    "include": [
        "scripts/ts/**/*"
    ]
}

The imports in my main.ts file are as follows:

import { css, html, LitElement } from 'lit';
import { customElement, property } from 'lit/decorators.js';

Although the main.ts file is successfully transpiled and main.js is loaded without issues, an error is encountered:

Uncaught TypeError: Failed to resolve module specifier "lit". Relative references must start with either "/", "./", or "../".

The import statements remain unchanged after transpilation. It appears that the problem lies in the incorrect module path: The browser is unaware that "lit" can be found in "node_modules/lit". Attempting to manually adjust the path in the transpiled file to ../node_modules/lit/index.js results in another error:

Uncaught TypeError: Failed to resolve module specifier "@lit/reactive-element". Relative references must start with either "/", "./", or "../".

This may indicate that there are interdependencies among different lit modules causing further complications in the hierarchy. Essentially, my import paths are not transpiled correctly and I am at a loss on how to proceed. Any assistance would be greatly appreciated!

Answer №1

Kudos to @cdimitroulas for sparking my thoughts on this topic.

When it comes to ES6 imports, using absolute or relative paths is essential - traditional node imports just won't cut it. These paths must be resolved not only for the main module, but for every other module in the dependency chain.

The Typescript compiler falls short in handling this issue. As a result, our current setup lacked a solution for resolving these paths (such as web-dev-server) or bundling modules and their dependencies into one file (like webpack), effectively eliminating the need for path resolution altogether.

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