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👏 You can access 11ty-fast-dev package with using 11TyFastDev variable in browser devtools!
11ty-fast-dev

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This makes 11ty more efficient when used behind a dev server, making it only compiles your pages when you actually want to see them.

This relies on you running your own dev server. (This could be built into eleventy --serve, I don't know.)

⚠️ This is a crazy idea and perhaps not intended for production use just yet. You're welcome!

Usage

Your .eleventy.js should be updated like this:

TODO(samthor): This should be flagged or only run in --watch mode.

const eleventyFastDev = require('11ty-fast-dev/patch');

module.exports = eleventyConfig => {
  // We can't set up 11ty-fast-dev here, but instead need to do it later in
  // 11ty's lifecycle. Its calculation of collections is a great place, as this
  // is before any files are written.
  // TODO(samthor): We only want to do this when flagged or in watch mode and
  // so on.
  const config = eleventyFastDev.buildConfig(eleventyConfig);
  eleventyConfig.addCollection('_11ty-fast-dev', config);

  // ... the rest of your config
};

Add this handler to your web server (this uses Express):

const {buildEleventyFastDevHandler} = require('11ty-fast-dev/handler');

const staticPaths = ['dist'];  // 11ty writes here by default
const eleventyFastDevHandler = buildEleventyFastDevHandler(staticPaths);

// Insert this _before_ your static handlers, so old dist files don't "win".
app.use(eleventyFastDevHandler);

Profit!

Implementation

The eleventy side does two things:

  • monkeypatches TemplateWriter._writeTemplate so that instead of writing a template, we store this ability into a closure
  • opens a web server on "localhost:9999", and when the right page is requested, renders the file

On the server side, it's a pretty basic handler which then goes out and asks "localhost:9999" for the right page.

Downsides

This will, as stated, only execute your templates and run transforms when you request a file. If you have side effects in these places, then this won't work for you. (This is generally considered a bad idea anyway).

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Score

Popularity3/100
Quality41/100
Maintenance79/100

Dependencies