フロントエンドの開発環境で、pugのコンパイルに失敗する。

フロントの開発環境にて、pugをコンパイルエラーを解決したいです。

現在下記のディレクトリ構造でフロント環境を構築しています。

root
├── README.md
├── gulpfile.js
├── package-lock.json
├── package.json
├── gulp/
│   ├── tasks/
│   │   └── html.js
│   └── config.js
├── dist/
│   ├── css/
│   └── index.html
└── src/
    ├── _partials/
    │   ├── _footer.pug
    │   └── _header.pug
    ├── css/
    │   └── main.sass
    ├── js/
    │   └── main.js
    ├── _layout.pug
    └── index.pug

発生している問題・エラーメッセージ

【_layout.pug】

doctype html
block init
- const title = meta.title || ""
- const desc = meta.desc || ""
- const path = meta.path || "./"
- const url = ""
head
  meta(charset="UTF-8")
  title = title
  meta(name="viewport", content="width=device-width, initial-scale=1.0")
  meta(http-equiv="X-UA-Compatible", content="ie=edge")
  meta(name="description", content="desc")
  meta(property="og:title" content=title)
  meta(property="og:type" content="website")
  meta(property="og:url" content=url)
  meta(property="og:image" content=`${url}`)
  meta(property="og:site_name" content=title)
  meta(property="og:description" content=desc)
  meta(property="twitter:title" content=title)
  meta(property="twitter:description" content=desc)

  link(rel="stylesheet", href=`${path}css/sanitize.sass`)
  link(rel="stylesheet", href=`${path}css/main.sass?v=${new Date().getTIme()}`)
body
  include /_partials/_header
  main#main
    block contents
  include /_partials/_footer


-------------------------------------------------
【index.pug】

extends /_layout
block init
  -
    const meta = {
      title: ""
    }
    const page = {
      id: "home"
    }
block content

-------------------------------------------------

【config.js】
const path = require("path");

// edit dir path
const src = {
  root: "./src",
  sass: "./src/css",
  pug: "./src",
  js: "./src/js",
  images: "./src/images"
};

const dest = {
  root: "./dist",
  css: "./dist/css",
  html: "./dist",
  js: "./dist/js",
  images: "./dist/images"
};

// pug settings
const pugConfig = {
  basedir: src,
  pretty: true
};

module.exports = {
  src,
  dest,
  pug: pugConfig
};

-------------------------------------------------

【html.js】
const gulp = require("gulp");
const pug = require("gulp-pug");
const plumber = require("gulp-plumber");
const progeny = require("gulp-progeny");
const config = require("../config");

// pug task
gulp.task("pug", done => {
  gulp
    .src(`${config.src.pug}/**/[^_]*.pug`)
    .pipe(plumber())
    .pipe(progeny())
    .pipe(pug())
    .pipe(gulp.dest(config.dest.html));
  done();
});