Nunjucks integration with Metalsmith

nunjucks-metalsmith.js

const Metalsmith = require('metalsmith');
const inPlace = require('metalsmith-in-place');

Metalsmith(__dirname)
  .source('./src')
  .destination('./build')
  .use(inPlace({
    pattern: '**/*.njk',
    engineOptions: {
      path: __dirname + '/src'
    }
  }))
  .build(function (error) {
    if (error) {
      throw error;
    }
  })
;

This is an example for my article: Making Metalsmith to work with Nunjucks.