fix(@schematics/angular): change entry file name of the library schematic according to the kebab-case convention

Author: wKoza

packages/schematics/angular/library/index_spec.ts

@@ -25,7 +25,7 @@ describe('Library Schematic', () => {
   );
   const defaultOptions: GenerateLibrarySchema = {
     name: 'foo',
-    entryFile: 'my_index',
+    entryFile: 'my-index',
     skipPackageJson: false,
     skipTsConfig: false,
     skipInstall: false,
@@ -51,7 +51,7 @@ describe('Library Schematic', () => {
       '/projects/foo/README.md',
       '/projects/foo/tslint.json',
       '/projects/foo/src/test.ts',
-      '/projects/foo/src/my_index.ts',
+      '/projects/foo/src/my-index.ts',
       '/projects/foo/src/lib/foo.module.ts',
       '/projects/foo/src/lib/foo.component.spec.ts',
       '/projects/foo/src/lib/foo.component.ts',
@@ -89,15 +89,15 @@ describe('Library Schematic', () => {
     const tree = schematicRunner.runSchematic('library', defaultOptions, workspaceTree);
     const fileContent = getJsonFileContent(tree, '/projects/foo/ng-package.json');
     expect(fileContent.lib).toBeDefined();
-    expect(fileContent.lib.entryFile).toEqual('src/my_index.ts');
+    expect(fileContent.lib.entryFile).toEqual('src/my-index.ts');
     expect(fileContent.dest).toEqual('../../dist/foo');
   });
 
   it('should use default value for baseDir and entryFile', () => {
     const tree = schematicRunner.runSchematic('library', {
       name: 'foobar',
     }, workspaceTree);
-    expect(tree.files).toContain('/projects/foobar/src/public_api.ts');
+    expect(tree.files).toContain('/projects/foobar/src/public-api.ts');
   });
 
   it(`should add library to workspace`, () => {

packages/schematics/angular/library/schema.json

@@ -19,7 +19,7 @@
       "type": "string",
       "format": "path",
       "description": "The path at which to create the library's public API file, relative to the workspace root.",
-      "default": "public_api"
+      "default": "public-api"
     },
     "prefix": {
       "type": "string",

tests/angular_devkit/build_ng_packagr/ng-packaged/projects/lib/ng-package.json

@@ -2,6 +2,6 @@
   "$schema": "../../../../../../node_modules/ng-packagr/ng-package.schema.json",
   "dest": "../../dist/lib",
   "lib": {
-    "entryFile": "src/public_api.ts"
+    "entryFile": "src/public-api.ts"
   }
 }