I'm currently trying to lower build times by externalizing Angular dependencies through Webpack externals. So far, I have achieved this wihout problems for React and other minor libraries.
If I just move '@angular/compiler' it also works, however when externalizing '@angular/core' and the others I receive a Can't resolve all parameters for ApplicationModule: (?) at at syntaxError (util.ts:100) at CompileMetadataResolver._getDependenciesMetadata (metadata_resolver.ts:957) ... error when bootstrapping the app.
The files that I'm using are the 8.2.14 UMD bundles you can find in unpkg.com and my externals are:
[
/^@example\,
/^rxjs$/,
/^rxjs\/operators$/,
/^@angular\/core$/,
/^@angular\/compiler$/,
/^@angular\/common$/,
/^@angular\/common\/http$/,
/^@angular\/forms$/,
/^@angular\/platform-browser$/,
/^@angular\/platform-browser-dynamic$/,
/^@angular\/router$/,
/^zone\.js$/,
/^single-spa$/
]
The rxjs bundles are the ones found here https://cdn.jsdelivr.net/npm/@esm-bundle.
You can see the error on this repo: https://github.com/OriolInvernonLlaneza/test-share-angular
Thanks in advance!
Edit: Thanks to yurzui's answer this error was solved. However, I now receive another error:
Class constructor I cannot be invoked without 'new'
at new EventEmitter (event_emitter.ts:78)
at new NgZone (ng_zone.ts:97)
at getNgZone (application_ref.ts:358)
at PlatformRef.bootstrapModuleFactory (application_ref.ts:255)
at application_ref.ts:308
You need to include core-js shim library so that Angular code can use Reflect.getOwnMetadata method to read metadata from decorated classes
index.ejs
<% if (isLocal) { %>
<script src="https://unpkg.com/[email protected]/client/shim.min.js"></script> <== add this
<script type="systemjs-importmap">
....
It doesn't matter which core-js version you will use but it should contain polyfill for reflect.get-own-metadata.
For example you can also use <script src='https://unpkg.com/[email protected]/minified.js'></script>
Angular CLI adds this polyfill by default in polyfills.ts for jit. But single-spa-angular removes this polyfill.
Note that you should also include zone.js to your file so the complete code should look like
index.ejs
<script src='https://unpkg.com/[email protected]/minified.js'></script>
<script src="https://unpkg.com/zone.js"></script>
Update
The error Class constructor I cannot be invoked without 'new' comes from rxjs bundle(@esm-bundle/[email protected]/system/rxjs.min.js) which means that this bundle wasn't built properly for using it in browser(more on this error here Javascript ES6 TypeError: Class constructor Client cannot be invoked without 'new').
You can use umd bundle for rxjs
"rxjs": "https://cdn.jsdelivr.net/npm/[email protected]/bundles/rxjs.umd.min.js",
"rxjs/operators": "https://cdn.jsdelivr.net/npm/@esm-bundle/[email protected]/system/rxjs-operators.min.js",
I will share the whole inject.ejs file below
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Root Config</title>
<meta name="importmap-type" content="systemjs-importmap" />
<% if (isLocal) { %>
<!--<script src="https://unpkg.com/[email protected]/client/shim.min.js"></script>-->
<script type="systemjs-importmap">
{
"imports": {
"@example/root-config": "http://localhost:9000/root-config.js",
"@example/angular": "http://localhost:4200/main.js",
"single-spa": "https://cdnjs.cloudflare.com/ajax/libs/single-spa/5.1.0/system/single-spa.dev.js",
"rxjs": "https://cdn.jsdelivr.net/npm/[email protected]/bundles/rxjs.umd.min.js",
"rxjs/operators": "https://cdn.jsdelivr.net/npm/@esm-bundle/[email protected]/system/rxjs-operators.min.js",
"@angular/core": "https://unpkg.com/@angular/[email protected]/bundles/core.umd.js",
"@angular/compiler": "https://unpkg.com/@angular/[email protected]/bundles/compiler.umd.js",
"@angular/common": "https://unpkg.com/@angular/[email protected]/bundles/common.umd.min.js",
"@angular/common/http": "https://unpkg.com/@angular/[email protected]/bundles/common-http.umd.min.js",
"@angular/platform-browser-dynamic": "https://unpkg.com/@angular/[email protected]/bundles/platform-browser-dynamic.umd.min.js",
"@angular/platform-browser": "https://unpkg.com/@angular/[email protected]/bundles/platform-browser.umd.min.js",
"@angular/platform-browser/animations": "https://unpkg.com/@angular/[email protected]/bundles/platform-browser-animations.umd.min.js",
"@angular/forms": "https://unpkg.com/@angular/[email protected]/bundles/forms.umd.min.js",
"@angular/router": "https://unpkg.com/@angular/[email protected]/bundles/router.umd.min.js",
"@angular/animations": "https://unpkg.com/@angular/[email protected]/bundles/animations.umd.js",
"@angular/animations/browser": "https://unpkg.com/@angular/[email protected]/bundles/animations-browser.umd.min.js",
"tslib": "https://cdnjs.cloudflare.com/ajax/libs/tslib/1.10.0/tslib.min.js",
"zone.js": "https://cdnjs.cloudflare.com/ajax/libs/zone.js/0.9.1/zone.min.js"
}
}
</script>
<% } %>
<script src='https://unpkg.com/[email protected]/minified.js'></script>
<script src="https://unpkg.com/zone.js"></script>
<script src="https://cdn.jsdelivr.net/npm/import-map-overrides/dist/import-map-overrides.js"></script>
<script src="https://cdn.jsdelivr.net/npm/systemjs/dist/system.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/systemjs/dist/extras/amd.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/systemjs/dist/extras/named-exports.min.js"></script>
</head>
<body>
<main id="main"></main>
<script>
System.import("@example/root-config");
</script>
<import-map-overrides-full show-when-local-storage="devtools" dev-libs></import-map-overrides-full>
</body>
</html>