Angular Schematics - Apply thousands of changes on tree cause error "Maximum call stack size exceeded"

# 🐞 Bug report

### Description

I use Angular Schematics to migrate from AngularJs to Angular. The application is a large one with thousands of page. I try to create a component for each page based on a template. When I try to create the component on a smaller project like 200 pages it's working but when I fall on a large one with more than 1000 pages (1000 schematics rules)

## 🔬 Minimal Reproduction

export function createPageComponents(options: any): Rule {

    return (tree: Tree, context: SchematicContext) => {

        const logger = context.logger;

        const directory = tree.getDir('my_path/pages');


        const rules: Rule[] = [];

        directory.visit((filePath) => {

            if (!filePath.endsWith('config.ts')) {

                return;

            }

            const dirPath = dirname(filePath);

            const parsedPath = parseName(dirPath, basename(filePath).split('.')[0]);

            options = {

                path: parsedPath.path,

                name: parsedPath.name

            };

            const templateSource = apply(

                url('./files'),

                [

                    applyTemplates({

                        ...strings,

                        ...options

                    }),

                    move(parsedPath.path)

                ]

            );

            const rule = mergeWith(templateSource);

            rules.push(rule);

        });

        return chain(rules);

    };

}

## 🔥 Exception or Error

    RangeError: Maximum call stack size exceeded

        at Console.warn ()

        at Observable._trySubscribe (my_path\node_modules\rxjs\internal\Observable.js:55:25)

        at Observable.subscribe (my_path\node_modules\rxjs\internal\Observable.js:30:22)

        at MergeMapOperator.call (my_path\node_modules\rxjs\internal\operators\mergeMap.js:39:23)

        at Observable.subscribe (my_path\node_modules\rxjs\internal\Observable.js:25:31)

        at MapOperator.call (my_path\node_modules\rxjs\internal\operators\map.js:32:23)

        at Observable.subscribe (my_path\node_modules\rxjs\internal\Observable.js:25:31)

        at MapToOperator.call (my_path\node_modules\rxjs\internal\operators\mapTo.js:26:23)

        at Observable.subscribe (my_path\node_modules\rxjs\internal\Observable.js:25:31)

        at DefaultIfEmptyOperator.call (my_path\node_modules\rxjs\internal\operators\defaultIfEmpty.js:27:23)

## 🌍 Your Environment

Angular CLI: 9.1.4

Node: 10.19.0

OS: win32 x64


Angular: 9.1.4

... animations, cli, common, compiler, compiler-cli, core, forms

... language-service, platform-browser, platform-browser-dynamic

... router

Ivy Workspace: Yes

Package                            Version

------------------------------------------------------------

@angular-devkit/architect          0.901.4

@angular-devkit/build-angular      0.901.4

@angular-devkit/build-ng-packagr   0.901.4

@angular-devkit/build-optimizer    0.901.4

@angular-devkit/build-webpack      0.901.4

@angular-devkit/core               9.1.4

@angular-devkit/schematics         9.1.7

@angular-devkit/schematics-cli     0.901.7

@angular/upgrade                   9.1.9

@ngtools/webpack                   9.1.4

@schematics/angular                9.1.4 (cli-only)

@schematics/schematics             0.901.7

@schematics/update                 0.901.4

ng-packagr                         9.1.3

rxjs                               6.5.5

typescript                         3.8.3

webpack                            4.42.0

Commencez au point d’entrée createPageComponents de la reproduction, en particulier avec le tableau rules et chain(rules), et reproduisez l’échec avec plus de 1 000 règles Schematics. Lisez le chemin d’exécution d’Angular Schematics avec la trace de pile RxJS présentée dans le rapport. C’est terminé lorsque le grand ensemble de modifications des composants de page peut être appliqué sans erreur de maximum call stack.

Rédigé par le modèle d'indexation à partir du texte de l'issue.