message: Type for SourceMapOptions
diff: @@ -3,6 +3,7 @@ import {
  postcss,
  postcssImport,
  postcssNesting,
  + SourceMapOptions,
  } from "../deps/postcss.ts";
  import { merge } from "../core/utils.ts";
  import { Helper, Page, Site } from "../core.ts";
  @@ -13,7 +14,7 @@ export interface Options {
  extensions: string[];
  /** Set `true` to generate source map files */
  - sourceMap: boolean;
  + sourceMap: boolean | SourceMapOptions;
  /** Custom includes path for `postcss-import` */
  includes: string | string[] | false;
  