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class Base {  src = {};  data = {};  tags = new Set();
  constructor(src) {    this.src = src;  }
  addTags(tags) {    if (!tags) {      return;    }
    if (tags instanceof Set || Array.isArray(tags)) {      tags.forEach((tag) => this.tags.add(tag));      return;    }
    this.tags.add(tags);  }}
export class Page extends Base {  content = undefined;  dest = {};
  addData(data) {    if (!data) {      return;    }
    if (data.tags) {      this.addTags(data.tags);      delete data.tags;    }
    if (data.content) {      this.content = data.content;      delete data.content;    }
    this.data = { ...data, ...this.data };  }}
export class Directory extends Base {  pages = new Map();  dirs = new Map();
  addData(data) {    if (!data) {      return;    }
    if (data.tags) {      this.addTags(data.tags);      delete data.tags;    }
    this.data = { ...data, ...this.data };  }
  *getPages(recursive = true) {    for (const page of this.pages.values()) {      yield [page, this];    }
    if (recursive) {      for (const dir of this.dirs.values()) {        yield* dir.getPages();      }    }  }
  expand() {    for (const [key, page] of this.pages.entries()) {      page.addData(this.data);
      if (page.data.ignore) {        this.pages.delete(key);        continue;      }
      page.addTags(this.tags);    }
    for (const dir of this.dirs.values()) {      dir.addData(this.data);      dir.addTags(this.tags);      dir.expand();    }  }}