fix(@schematics/update): ng update ignores packages it cannot find

Fix angular/angular-cli#10167

Author: hansl

packages/schematics/update/update/index.ts

@@ -656,7 +656,29 @@ export default function(options: UpdateSchema): Rule {
 
       // Build a map of all dependencies and their packageJson.
       reduce<NpmRepositoryPackageJson, Map<string, NpmRepositoryPackageJson>>(
-        (acc, npmPackageJson) => acc.set(npmPackageJson.name, npmPackageJson),
+        (acc, npmPackageJson) => {
+          // If the package was not found on the registry. It could be private, so we will just
+          // ignore. If the package was part of the list, we will error out, but will simply ignore
+          // if it's either not requested (so just part of package.json. silently) or if it's a
+          // `--all` situation. There is an edge case here where a public package peer depends on a
+          // private one, but it's rare enough.
+          if (!npmPackageJson.name) {
+            if (packages.has(npmPackageJson.requestedName)) {
+              if (options.all) {
+                logger.warn(`Package ${JSON.stringify(npmPackageJson.requestedName)} was not `
+                  + 'found on the registry. Skipping.');
+              } else {
+                throw new SchematicsException(
+                  `Package ${JSON.stringify(npmPackageJson.requestedName)} was not found on the `
+                  + 'registry. Cannot continue as this may be an error.');
+              }
+            }
+          } else {
+            acc.set(npmPackageJson.name, npmPackageJson);
+          }
+
+          return acc;
+        },
         new Map<string, NpmRepositoryPackageJson>(),
       ),
 

packages/schematics/update/update/npm-package-json.ts

@@ -9,6 +9,7 @@ import { JsonSchemaForNpmPackageJsonFiles } from './package-json';
 
 export interface NpmRepositoryPackageJson {
   name: string;
+  requestedName: string;
   description: string;
 
   'dist-tags': {

packages/schematics/update/update/npm.ts

@@ -28,7 +28,7 @@ export function getNpmPackageJson(
   packageName: string,
   registryUrl: string,
   logger: logging.LoggerApi,
-): Observable<NpmRepositoryPackageJson> {
+): Observable<Partial<NpmRepositoryPackageJson>> {
   let fullUrl = new url.URL(`http://${registryUrl}/${packageName.replace(/\//g, '%2F')}`);
   try {
     const registry = new url.URL(registryUrl);
@@ -53,6 +53,7 @@ export function getNpmPackageJson(
       response.on('end', () => {
         try {
           const json = JSON.parse(data);
+          json.requestedName = packageName;
           subject.next(json as NpmRepositoryPackageJson);
           subject.complete();
         } catch (err) {