fix: Use moduleName() to determine addon's referenced name.

ts/lib/commands/precompile.ts

@@ -53,8 +53,9 @@ export default command({
     // addon name from its package name, we use the addon name, since that is
     // how it will be written for imports.
     let addon = this.project.addons.find((addon) => addon.root === this.project.root);
-    if (addon && addon.name !== packageName) {
-      packageName = addon.name;
+    if (addon) {
+      let addonName = addon.moduleName ? addon.moduleName() : addon.name;
+      packageName = addonName;
     }
 
     let createdFiles = copyDeclarations(pathRoots, paths, packageName, this.project.root);

ts/tests/commands/precompile-test.ts

@@ -1,4 +1,5 @@
 import * as fs from 'fs-extra';
+import * as path from 'path';
 import { hook } from 'capture-console';
 import ember from 'ember-cli-blueprint-test-helpers/lib/helpers/ember';
 import blueprintHelpers from 'ember-cli-blueprint-test-helpers/helpers';
@@ -109,10 +110,57 @@ describe('Acceptance: ts:precompile command', function () {
     pkg.name = '@foo/my-addon'; // addon `name` is `my-addon`
     fs.writeJSONSync('package.json', pkg);
 
+    // CAUTION! HACKY CODE AHEAD!
+    // The ember blueprint helper stays in the same node process, so require
+    // keeps any previously read files cached. We need to clear out these
+    // caches so it picks up the changes properly.
+    delete require.cache[path.join(process.cwd(), 'index.js')];
+    delete require.cache[path.join(process.cwd(), 'package.json')];
+
     return ember(['ts:precompile']).then(() => {
       const declaration = file('test-support/test-file.d.ts');
       expect(declaration).to.exist;
       expect(declaration.content.trim()).to.equal(`export declare const testString: string;`);
     });
   });
+
+  it('generates .d.ts files for components when addon and moduleName do not match', function () {
+    fs.ensureDirSync('addon/components');
+    fs.writeFileSync(
+      'addon/components/my-component.ts',
+      `export const testString: string = 'hello';`
+    );
+    fs.ensureDirSync('addon-test-support');
+    fs.writeFileSync(
+      'addon-test-support/test-file.ts',
+      `export const anotherTestString: string = 'hello';`
+    );
+    fs.writeFileSync(
+      'index.js',
+      `module.exports = { name: '@foo/my-addon', moduleName() { return 'my-addon'; } };`
+    );
+
+    const pkg = fs.readJSONSync('package.json');
+    pkg.name = '@foo/my-addon'; // addon `moduleName()` is `my-addon`
+    fs.writeJSONSync('package.json', pkg);
+
+    // CAUTION! HACKY CODE AHEAD!
+    // The ember blueprint helper stays in the same node process, so require
+    // keeps any previously read files cached. We need to clear out these
+    // caches so it picks up the changes properly.
+    delete require.cache[path.join(process.cwd(), 'index.js')];
+    delete require.cache[path.join(process.cwd(), 'package.json')];
+
+    return ember(['ts:precompile']).then(() => {
+      const componentDecl = file('components/my-component.d.ts');
+      expect(componentDecl).to.exist;
+      expect(componentDecl.content.trim()).to.equal(`export declare const testString: string;`);
+
+      const testSupportDecl = file('test-support/test-file.d.ts');
+      expect(testSupportDecl).to.exist;
+      expect(testSupportDecl.content.trim()).to.equal(
+        `export declare const anotherTestString: string;`
+      );
+    });
+  });
 });

ts/types/ember-cli/index.d.ts

@@ -40,6 +40,7 @@ declare module 'ember-cli/lib/models/addon' {
     serverMiddleware(options: { app: Application; options?: TaskOptions }): void | Promise<void>;
     testemMiddleware(app: Application, options?: TaskOptions): void;
     setupPreprocessorRegistry(type: 'self' | 'parent', registry: PreprocessRegistry): void;
+    moduleName(): string;
   }
 }