Function buildComponent

src/cdk/schematics/utils/build-component.ts:154–254

(
  options: ComponentOptions,
  additionalFiles: {[key: string]: string} = {},
)

 * to manually duplicate the file content.
 */
export function buildComponent(
  options: ComponentOptions,
  additionalFiles: {[key: string]: string} = {},
): Rule {
  return async (host, ctx) => {
    const context = ctx as FileSystemSchematicContext;
    const workspace = await readWorkspace(host);
    const project = getProjectFromWorkspace(workspace, options.project);
    const defaultComponentOptions = getDefaultComponentOptions(project);

    // TODO(devversion): Remove if we drop support for older CLI versions.
    // This handles an unreported breaking change from the @angular-devkit/schematics. Previously
    // the description path resolved to the factory file, but starting from 6.2.0, it resolves
    // to the factory directory.
    const schematicPath = statSync(context.schematic.description.path).isDirectory()
      ? context.schematic.description.path
      : dirname(context.schematic.description.path);

    const schematicFilesUrl = './files';
    const schematicFilesPath = resolve(schematicPath, schematicFilesUrl);

    // Add the default component option values to the options if an option is not explicitly
    // specified but a default component option is available.
    Object.keys(options)
      .filter(
        key =>
          options[key as keyof ComponentOptions] == null &&
          defaultComponentOptions[key as keyof ComponentOptions],
      )
      .forEach(
        key =>
          ((options as any)[key] = (defaultComponentOptions as ComponentOptions)[
            key as keyof ComponentOptions
          ]),
      );

    if (options.path === undefined) {
      options.path = buildDefaultPath(project);
    }

    options.standalone = await isStandaloneSchematic(host, options);

    if (!options.standalone) {
      // TODO: Remove ext option when the Angular CLI looks for both candidate locations.
      options.module = findModuleFromOptions(host, {...options, moduleExt: 'module.ts'});
    }

    const parsedPath = parseName(options.path!, options.name);

    options.name = parsedPath.name;
    options.path = parsedPath.path;
    options.selector = options.selector || buildSelector(options, project.prefix);

    validateHtmlSelector(options.selector!);

    // In case the specified style extension is not part of the supported CSS supersets,
    // we generate the stylesheets with the "css" extension. This ensures that we don't
    // accidentally generate invalid stylesheets (e.g. drag-drop-comp.styl) which will