I’m working on an Angular project in a corporate environment. We recently had to migrate from our old npm repository server to a new one. After updating my .npmrc configuration with the new server details, my build started failing unexpectedly.
My current .npmrc setup:
email = [email protected]
always-auth = true
registry=https://new-repo.workplace.com/npm/packages/
//new-repo.workplace.com/npm/packages/:_authToken=my-authentication-token
The build errors I’m seeing:
- First, it complains about missing
@types/minimatch package
- After adding that dependency, I get this webpack error:
ERROR in ./node_modules/react-draggable/build/cjs/Draggable.js 185:15
Module parse failed: Unexpected token (185:15)
You may need an appropriate loader to handle this file type
| // Get the DOM element reference
| getDOMElement() ?: HTMLElement{
> return this.state?.elementRef?.current ?? _reactDom.default.findDOMNode(this);
| }
| display() ?: ReactElement<any>{
My TypeScript configuration:
{
"compilerOptions": {
"lib": ["es2015", "dom", "ES2020.String"],
"target": "es2015",
"module": "esnext",
"moduleResolution": "node",
"experimentalDecorators": true
}
}
The strange part is that switching back to the old repository makes everything work perfectly again. The authentication works fine with the new server and packages download correctly. Why would changing npm repositories cause compilation issues with optional chaining syntax in third-party libraries?
sounds like a dependency resolution problem. your new npm server’s probably pulling different transitive dependencies than the old one. i’ve seen this with corporate repos that don’t sync perfectly with public npm. try locking your package versions down tighter, or check if the new server filters/scans packages before serving them. some enterprise npm solutions rewrite package contents for security, which breaks things unexpectedly.
Been there! Our infrastructure team pulled the same move mid-sprint. It’s not just version differences - your corporate npm server is probably serving packages with different compilation states or metadata than your build expects.
Skip the npm config wrestling and dependency hunting. I automated the whole thing instead. Built a workflow that watches for environment changes and adjusts build configs automatically when it spots repo switches.
It locks versions, clears caches on repo changes, and runs compatibility checks before builds kick off. No more deleting package-lock files or digging through TypeScript settings.
Now when this stuff happens, the system catches it early and either fixes it or tells us exactly what to do. Saved us 20+ hours of debugging in the first month.
Latenode works great for this - connects npm operations with build tools without the headache: https://latenode.com
This occurs because your corporate npm repository has different package versions cached compared to your old one. You may be retrieving a newer version of react-draggable that includes ES2020 features such as optional chaining, while your TypeScript target remains at ES2015. Having ES2020.String in your lib array doesn’t resolve the issue, given your compilation target cannot accommodate optional chaining.
I faced a similar issue when we transitioned repositories last year. Start by clearing your local cache with npm cache clean --force, removing node_modules and package-lock.json, and then reinstall everything from scratch.
If this does not resolve the issue, you can either increase your TypeScript target to ES2020 or specify the previous react-draggable version that functioned correctly in your package.json. You can reference your old package-lock.json if available to identify the version you had been using.
The Problem:
You’re experiencing build errors after migrating your Angular project to a new corporate npm repository. The errors indicate issues with package archive extraction and a webpack parsing error related to optional chaining in react-draggable. While package downloads seem successful, the build process fails, suggesting a mismatch between the packages served by the new repository and your project’s configuration or local environment. The error ERROR in ./node_modules/react-draggable/build/cjs/Draggable.js 185:15 Module parse failed: Unexpected token (185:15) points to incompatibility between the react-draggable package version provided by the new repository and your TypeScript configuration’s target ES version.
Understanding the “Why” (The Root Cause):
Corporate npm repositories often manage packages and their metadata differently than public registries. The new server might serve packages with different compilation states, metadata inconsistencies, or even corrupted versions compared to your previous repository. This difference could lead to the webpack parsing error. Your TypeScript configuration, targeting es2015, might be incompatible with newer versions of react-draggable that utilize ES2020 features like optional chaining (the source of the Unexpected token error). The new repository may also employ different version resolution strategies or filtering mechanisms that alter the packages’ contents or metadata before serving them.
Step-by-Step Guide:
- Verify Package Metadata: Compare the metadata of
react-draggable from both the old and new npm repositories. This will help you identify version discrepancies or potential metadata issues. Use the following command for both repositories:
npm view react-draggable
Note any differences in version numbers, dependencies, or other metadata fields.
- Check TypeScript Configuration: Ensure your TypeScript configuration is compatible with the
react-draggable version served by the new repository. The Unexpected token error in Draggable.js strongly suggests a version mismatch. If the react-draggable version from the new repository uses ES2020 features, you’ll need to update your tsconfig.json:
{
"compilerOptions": {
"lib": ["es2015", "dom", "ES2020"], //Updated lib array
"target": "es2020", //Updated target
"module": "esnext",
"moduleResolution": "node",
"experimentalDecorators": true
}
}
- Clean and Reinstall: After adjusting your TypeScript configuration (if needed), perform a thorough clean and reinstall of your project’s dependencies:
rm -rf node_modules package-lock.json
npm cache clean --force
npm install
This ensures you’re working with a fresh set of packages from the new repository.
- Investigate Repository Configuration: If steps 1-3 don’t resolve the issue, investigate the configuration of your new corporate npm repository. It might have specific settings (proxy settings, package filtering, etc.) causing these inconsistencies. Contact your infrastructure or DevOps team to assess whether the repository correctly serves packages and their associated metadata.
Common Pitfalls & What to Check Next:
- Webpack Configuration: Examine your
webpack.config.js to make sure it correctly handles JavaScript and TypeScript files, especially within the node_modules directory. Incorrect configuration can lead to the compiler attempting to parse JavaScript files as TypeScript.
- Proxy Issues: If your corporate network uses a proxy, ensure it’s properly configured to allow access to both your corporate npm repository and external dependencies. Problems with proxy configuration can lead to incomplete or corrupted package downloads.
- Disk Space: Always ensure you have enough free disk space. Low disk space can interrupt downloads and lead to corrupted packages.
- Alternative Package Managers: As a last resort, consider using alternative package managers like yarn or pnpm. They might handle package resolution and archive downloads differently, resolving the issues.
Still running into issues? Share your (sanitized) config files, the exact command you ran, and any other relevant details. The community is here to help!
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