Remove dead parallelism options and narrow public API

The parallelism fields on bundler types (BundlingOptions, BuildOptions,
BackendBundlingOptions) and createDistWorkspace Options were defined but
never read — fully dead code. Likewise the parallelismSetting option on
ParallelWorkerOptions was never passed by any caller.

Also narrows the cli-node public API to only export the three runner
functions and their option types, keeping getEnvironmentParallelism and
parseParallelismOption as internal utilities.

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/cli/src/modules/build/lib/buildBackend.ts

@@ -20,7 +20,7 @@ import { resolve as resolvePath } from 'node:path';
 import * as tar from 'tar';
 import { createDistWorkspace } from './packager';
 import { buildPackage, Output } from './builder';
-import { PackageGraph, getEnvironmentParallelism } from '@backstage/cli-node';
+import { PackageGraph } from '@backstage/cli-node';
 
 const BUNDLE_FILE = 'bundle.tar.gz';
 const SKELETON_FILE = 'skeleton.tar.gz';
@@ -52,7 +52,6 @@ export async function buildBackend(options: BuildBackendOptions) {
       configPaths,
       buildDependencies: !skipBuildDependencies,
       buildExcludes: [pkg.name],
-      parallelism: getEnvironmentParallelism(),
       skeleton: SKELETON_FILE,
       minify,
     });

packages/cli/src/modules/build/lib/buildFrontend.ts

@@ -17,10 +17,7 @@
 import fs from 'fs-extra';
 import { resolve as resolvePath } from 'node:path';
 import { buildBundle, getModuleFederationRemoteOptions } from './bundler';
-import {
-  BackstagePackageJson,
-  getEnvironmentParallelism,
-} from '@backstage/cli-node';
+import { BackstagePackageJson } from '@backstage/cli-node';
 import { loadCliConfig } from '../../config/lib/config';
 
 interface BuildAppOptions {
@@ -39,7 +36,6 @@ export async function buildFrontend(options: BuildAppOptions) {
   await buildBundle({
     targetDir,
     entry: 'src/index',
-    parallelism: getEnvironmentParallelism(),
     statsJsonEnabled: writeStats,
     moduleFederationRemote: options.isModuleFederationRemote
       ? await getModuleFederationRemoteOptions(

packages/cli/src/modules/build/lib/bundler/types.ts

@@ -36,7 +36,6 @@ export type BundlingOptions = {
   isDev: boolean;
   frontendConfig: Config;
   getFrontendAppConfigs(): AppConfig[];
-  parallelism?: number;
   additionalEntryPoints?: string[];
   // Path to append to the detected public path, e.g. '/public'
   publicSubPath?: string;
@@ -63,7 +62,6 @@ export type BuildOptions = BundlingPathsOptions & {
   // Target directory, defaulting to paths.targetDir
   targetDir?: string;
   statsJsonEnabled: boolean;
-  parallelism?: number;
   schema?: ConfigSchema;
   frontendConfig: Config;
   frontendAppConfigs: AppConfig[];
@@ -75,7 +73,6 @@ export type BuildOptions = BundlingPathsOptions & {
 export type BackendBundlingOptions = {
   checksEnabled: boolean;
   isDev: boolean;
-  parallelism?: number;
   inspectEnabled: boolean;
   inspectBrkEnabled: boolean;
   require?: string;

packages/cli/src/modules/build/lib/packager/createDistWorkspace.ts

@@ -86,11 +86,6 @@ type Options = {
    */
   buildExcludes?: string[];
 
-  /**
-   * Controls amount of parallelism in some build steps.
-   */
-  parallelism?: number;
-
   /**
    * If set, creates a skeleton tarball that contains all package.json files
    * with the same structure as the workspace dir.