Function schematic

packages/angular_devkit/schematics/src/rules/schematic.ts:51–71

(
  schematicName: string,
  options: OptionT,
  executionOptions?: Partial<ExecutionOptions>,
)

 * @param options The options to pass as input to the RuleFactory.
 */
export function schematic<OptionT extends object>(
  schematicName: string,
  options: OptionT,
  executionOptions?: Partial<ExecutionOptions>,
): Rule {
  return (input: Tree, context: SchematicContext) => {
    const collection = context.schematic.collection;
    const schematic = collection.createSchematic(schematicName, true);

    return schematic.call(options, observableOf(branch(input)), context, executionOptions).pipe(
      last(),
      map((x) => {
        // We allow overwrite conflict here because they're the only merge conflict we particularly
        // don't want to deal with; the input tree might have an OVERWRITE which the sub
        input.merge(x, MergeStrategy.AllowOverwriteConflict);

        return input;
      }),
    );
  };
}