[rush] Setting to avoid manually configuring decoupledLocalDependencies across subspaces

common/changes/@microsoft/rush/chore-auto-generate-decouple_2025-01-09-12-50.json

@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@microsoft/rush",
+      "comment": "Add a configuration option to avoid manually configuring decoupledLocalDependencies across subspaces.",
+      "type": "none"
+    }
+  ],
+  "packageName": "@microsoft/rush"
+}

common/config/rush/experiments.json

@@ -108,4 +108,13 @@
    * When this toggle is enabled, Rush will only scan specific paths, significantly speeding up Git operations.
    */
   // "enableSubpathScan": true
+
+  /**
+   * Rush has a policy that normally requires Rush projects to specify `workspace:*` in package.json when depending
+   * on other projects in the workspace, unless they are explicitly declared as `decoupledLocalDependencies`
+   * in rush.json.  Enabling this experiment will remove that requirement for dependencies belonging to a different
+   * subspace.  This is useful for large product groups who work in separate subspaces and generally prefer to consume
+   * each other's packages via the NPM registry.
+   */
+  //  "exemptDecoupledDependenciesBetweenSubspaces": true
 }

common/reviews/api/rush-lib.api.md

@@ -482,6 +482,7 @@ export interface IExperimentsJson {
     buildSkipWithAllowWarningsInSuccessfulBuild?: boolean;
     cleanInstallAfterNpmrcChanges?: boolean;
     enableSubpathScan?: boolean;
+    exemptDecoupledDependenciesBetweenSubspaces?: boolean;
     forbidPhantomResolvableNodeModulesFolders?: boolean;
     generateProjectImpactGraphDuringRushUpdate?: boolean;
     noChmodFieldInTarHeaderNormalization?: boolean;

libraries/rush-lib/assets/rush-init/common/config/rush/experiments.json

@@ -108,5 +108,14 @@
    * By default, rush perform a full scan of the entire repository. For example, Rush runs `git status` to check for local file changes.
    * When this toggle is enabled, Rush will only scan specific paths, significantly speeding up Git operations.
    */
-  /*[LINE "HYPOTHETICAL"]*/ "enableSubpathScan": true
+  /*[LINE "HYPOTHETICAL"]*/ "enableSubpathScan": true,
+
+  /**
+   * Rush has a policy that normally requires Rush projects to specify `workspace:*` in package.json when depending
+   * on other projects in the workspace, unless they are explicitly declared as `decoupledLocalDependencies`
+   * in rush.json.  Enabling this experiment will remove that requirement for dependencies belonging to a different
+   * subspace.  This is useful for large product groups who work in separate subspaces and generally prefer to consume
+   * each other's packages via the NPM registry.
+   */
+  /*[LINE "HYPOTHETICAL"]*/ "exemptDecoupledDependenciesBetweenSubspaces": false
 }

libraries/rush-lib/src/api/ExperimentsConfiguration.ts

@@ -119,6 +119,15 @@ export interface IExperimentsJson {
    * When this toggle is enabled, Rush will only scan specific paths, significantly speeding up Git operations.
    */
   enableSubpathScan?: boolean;
+
+  /**
+   * Rush has a policy that normally requires Rush projects to specify `workspace:*` in package.json when depending
+   * on other projects in the workspace, unless they are explicitly declared as `decoupledLocalDependencies`
+   * in rush.json.  Enabling this experiment will remove that requirement for dependencies belonging to a different
+   * subspace.  This is useful for large product groups who work in separate subspaces and generally prefer to consume
+   * each other's packages via the NPM registry.
+   */
+  exemptDecoupledDependenciesBetweenSubspaces?: boolean;
 }
 
 const _EXPERIMENTS_JSON_SCHEMA: JsonSchema = JsonSchema.fromLoadedObject(schemaJson);

libraries/rush-lib/src/logic/installManager/WorkspaceInstallManager.ts

@@ -223,9 +223,19 @@ export class WorkspaceInstallManager extends BaseInstallManager {
         const dependencySpecifier: DependencySpecifier = new DependencySpecifier(name, version);
 
         // Is there a locally built Rush project that could satisfy this dependency?
-        const referencedLocalProject: RushConfigurationProject | undefined =
+        let referencedLocalProject: RushConfigurationProject | undefined =
           this.rushConfiguration.getProjectByName(name);
 
+        // If we enable exemptDecoupledDependenciesBetweenSubspaces, it will only check dependencies within the subspace.
+        if (
+          this.rushConfiguration.experimentsConfiguration.configuration
+            .exemptDecoupledDependenciesBetweenSubspaces
+        ) {
+          if (referencedLocalProject && !subspace.contains(referencedLocalProject)) {
+            referencedLocalProject = undefined;
+          }
+        }
+
         // Validate that local projects are referenced with workspace notation. If not, and it is not a
         // cyclic dependency, then it needs to be updated to specify `workspace:*` explicitly. Currently only
         // supporting versions and version ranges for specifying a local project.
@@ -248,9 +258,9 @@ export class WorkspaceInstallManager extends BaseInstallManager {
             // eslint-disable-next-line no-console
             console.log(
               Colorize.red(
-                `"${rushProject.packageName}" depends on package "${name}" (${version}) which exists ` +
-                  'within the workspace but cannot be fulfilled with the specified version range. Either ' +
-                  'specify a valid version range, or add the package as a cyclic dependency.'
+                `"${rushProject.packageName}" depends on package "${name}" (${version}) which belongs to ` +
+                  'the workspace but cannot be fulfilled with the specified version range. Either ' +
+                  'specify a valid version range, or add the package to "decoupledLocalDependencies" in rush.json.'
               )
             );
             throw new AlreadyReportedError();

libraries/rush-lib/src/schemas/experiments.schema.json

@@ -77,6 +77,10 @@
     "enableSubpathScan": {
       "description": "By default, rush perform a full scan of the entire repository. For example, Rush runs `git status` to check for local file changes. When this toggle is enabled, Rush will only scan specific paths, significantly speeding up Git operations.",
       "type": "boolean"
+    },
+    "exemptDecoupledDependenciesBetweenSubspaces": {
+      "description": "Rush has a policy that normally requires Rush projects to specify `workspace:*` in package.json when depending on other projects in the workspace, unless they are explicitly declared as `decoupledLocalDependencies in rush.json. Enabling this experiment will remove that requirement for dependencies belonging to a different subspace. This is useful for large product groups who work in separate subspaces and generally prefer to consume each other's packages via the NPM registry.",
+      "type": "boolean"
     }
   },
   "additionalProperties": false