Linking to a file within an npm package

Is it possible to reference local files within an npm package? Will these references still work correctly when the package is installed by a different consumer? For example, let's say I have developed an npm package for Angular which includes some HTML and CSS files from a third party not using Angular packages. During the package publish, I ensure that these files are copied to `...dist\thirdparty`. Now, I want to access these files in my package using relative paths or other methods.

For instance,

@Component({
selector: 'ng2-my-library',
template: '<div></div>'
})
export class MyLibraryComponent {
.....
var newWindowUrl = "./thirdparty/some.html"; **// Need to find the location of some.html relatively here**
window.open(newWindowUrl);
.....
}

Once I install `my-package` in a sample Angular application, the above code results in `"localhost:3000/thirdparty/some.html"`, which is incorrect.

How can I resolve this issue?

Upon installing my package, the structure for the consumer would look like this:

consumerApp
  node_modules(Folder)
    ng2-my-library(Folder)
      ng2-pdfjs-viewer.umd.js // This is where I need to access some.html
      thirdparty(Folder)
        some.html

I have considered advising consumers to use instructions like the following, but this would rely heavily on other build tools to copy or redirect the HTML, which is not ideal:

   var TransferWebpackPlugin = require('transfer-webpack-plugin');
         ...
         plugins: [
           new TransferWebpackPlugin([
             { from: 'node_modules/my-package/assets', to: path.join(__dirname, 'my/public') }
           ])
         ] 

I also attempted to utilize the package mentioned below, but it did not yield accurate results for HTML content: https://www.npmjs.com/package/static-reference

Answer №1

When accessing the local directory where your file is stored, use __dirname instead of .. Update your code like this:

var newWindowUrl = __dirname + "/thirdparty/some.html";
window.open(newWindowUrl);

For more details on how to use __dirname, check out this link.

Remember to add node types to your project:

npm install --save-dev @types/node

Answer №2

If you're looking to make static assets accessible on your web server, here's a solution for you:

Firstly, ensure the assets are publicly available by configuring your webserver to serve them from a designated folder (e.g. the thirdparty folder).

For instance, if you're working with express, consider using the serve-static package.

var path = require('path');
var assetsFolder = path.join(__dirname, './node_modules/ng2-my-library/thirdparty');

app.use('/thirdparty', express.static(assetsFolder));
//...
app.listen ...

Next, reference the file in your component by providing the appropriate file path like this:

window.open('/thirdparty/some.html')

If necessary, you can also copy the files using a npm post-install task, but remember to ensure they are located where the browser can access them statically. It's important to consider that not all clients will have an assets folder, so some level of web server configuration may still be required.

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