fix(link): it should be possible to link a subset of components from the workspace

e2e/harmony/link.e2e.ts

@@ -21,6 +21,25 @@ describe('linking to a target', function () {
   });
 });
 
+describe('linking a subset of components to a target', function () {
+  this.timeout(0);
+  let helper: Helper;
+  let targetDir: string;
+  before(() => {
+    helper = new Helper();
+    helper.scopeHelper.setNewLocalAndRemoteScopes();
+    helper.fixtures.populateComponents(2);
+    targetDir = globalBitTempDir();
+    helper.command.link(`comp1 --target=${targetDir}`);
+  });
+  it('should link the scecified component to the target directory', () => {
+    expect(path.join(targetDir, `node_modules/@${helper.scopes.remote}/comp1`)).to.be.a.path();
+  });
+  it('should not link the not specified component to the target directory', () => {
+    expect(path.join(targetDir, `node_modules/@${helper.scopes.remote}/comp2`)).not.to.be.a.path();
+  });
+});
+
 describe('linking to a target including peers', function () {
   this.timeout(0);
   let helper: Helper;

scopes/workspace/install/install.main.runtime.ts

@@ -296,7 +296,7 @@ export class InstallMain {
       linkDepsResolvedFromEnv: !hasRootComponents,
       linkNestedDepsInNM: !this.workspace.isLegacy && !hasRootComponents,
     };
-    const { linkedRootDeps } = await this.calculateLinks(linkOpts);
+    const { linkedRootDeps } = await this.calculateLinks([], linkOpts);
     // eslint-disable-next-line prefer-const
     let { mergedRootPolicy, componentsAndManifests: current } = await this._getComponentsManifestsAndRootPolicy(
       installer,
@@ -858,10 +858,11 @@ export class InstallMain {
    * This information may then be passed to the package manager, which will create the links on its own.
    */
   async calculateLinks(
+    ids: ComponentID[],
     options: WorkspaceLinkOptions = {}
   ): Promise<{ linkResults: WorkspaceLinkResults; linkedRootDeps: Record<string, string> }> {
     await pMapSeries(this.preLinkSlot.values(), (fn) => fn(options)); // import objects if not disabled in options
-    const compDirMap = await this.getComponentsDirectory([]);
+    const compDirMap = await this.getComponentsDirectory(ids);
     const linker = this.dependencyResolver.getLinker({
       rootDir: this.workspace.path,
       linkingOptions: options,
@@ -888,8 +889,9 @@ export class InstallMain {
     return linkToNodeModulesWithCodemod(this.workspace, bitIds, options?.rewire ?? false);
   }
 
-  async link(options: WorkspaceLinkOptions = {}): Promise<WorkspaceLinkResults> {
-    const { linkResults, linkedRootDeps } = await this.calculateLinks(options);
+  async link(ids: string[], options: WorkspaceLinkOptions = {}): Promise<WorkspaceLinkResults> {
+    const componentIds = await Promise.all(ids.map((id) => this.workspace.resolveComponentId(id)));
+    const { linkResults, linkedRootDeps } = await this.calculateLinks(componentIds, options);
     await createLinks(options.linkToDir ?? this.workspace.path, linkedRootDeps, {
       avoidHardLink: true,
       skipIfSymlinkValid: true,
@@ -986,7 +988,7 @@ export class InstallMain {
       return;
     }
     if (needLink) {
-      await this.link();
+      await this.link([]);
     }
   }
 

scopes/workspace/install/link/link.cmd.ts

@@ -95,7 +95,7 @@ export class LinkCommand implements Command {
       fetchObject: !opts.skipFetchingObjects,
       includePeers: opts.peers,
     };
-    const linkResults = await this.install.link(linkOpts);
+    const linkResults = await this.install.link(ids ?? [], linkOpts);
     return linkResults;
   }
 }