chore(model-api-gen): add comment about "updateDependencies" task from NPM packages

model-api-gen-gradle-test/vue-integration/build.gradle.kts

@@ -5,6 +5,28 @@ plugins {
     alias(libs.plugins.node)
 }
 
+/**
+ * This task is needed because the listed packages have been rebuilt (locally or CI).
+ * As a result, the verification hashes in package-lock.json are out of date.
+ * Reinstalling them will update their hashes.
+ * This issue only arises because we are using the packaged libraries.
+ *
+ * If you want to install a local package, it makes a difference whether you
+ * (a) link the folder with the package.json and the built files,
+ * (b) or pack it into a `tgz' using `npm pack'.
+ *
+ * We use packaged libraries (b) for the following reason:
+ *
+ * Packaged local packages (b) behave like packages pulled from NPM.
+ * In case (a), Node.js doesn't behave like packages pulled by NPM.
+ * Such packages will be loaded more than once if they are imported from different locations.
+ * This is relevant when working with global declarations.
+ *
+ * This includes obvious things like global variables but also class declarations.
+ * For example, loading the same class twice breaks `instanceof` checks
+ * when objects are pass across JS module boundaries.
+ * Another problem arises when the far-reaching `LanguageRegistry.INSTANCE` singleton is duplicated.
+ */
 val updateDependencies = tasks.register<NpmTask>("updateDependencies") {
     dependsOn(":typescript-generation:packJsPackage")
     args.set(