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Developer notes

Starting a local instance

This starts Jekyll and Webpack.

yarn install
bundle install
env PORT=4001 yarn run dev

CSS classes

See https://devhints.io/cheatsheet-styles for a reference on styling.

JavaScript

When updating JavaScript, be sure webpack is running (yarn run dev takes care of this).

This auto-updates /assets/packed/ with sources in _js/.

JavaScript tests

There are also automated tests:

yarn run test --watch

Frontmatter

Each sheet supports these metadata:

---
title: React.js
layout: 2017/sheet   # 'default' | '2017/sheet'

# Optional:
category: React
updated: 2017-08-30       # To show in the updated list
ads: false                # Add this to disable ads
weight: -5                # lower number = higher in related posts list
deprecated: true          # Don't show in related posts
deprecated_by: /enzyme    # Point to latest version
prism_languages: [vim]    # Extra syntax highlighting
intro: |
  This is some *Markdown* at the beginning of the article.
tags:
  - WIP
  - Featured

# Special pages:
# (don't set these for cheatsheets)
type: home                # home | article | error
og_type: website          # opengraph type
---

Prism languages

For supported prism languages:

Setting up redirects

This example sets up a redirect from es2015 to es6:

# /es2015.md
---
title: ES2015
category: Hidden
redirect_to: /es6
---

Localizations

See _data/content.yml for chrome strings.

Forking

So you want to fork this repo? Sure, here's what you need to know to whitelabel this:

  • It's all GitHub pages, so the branch has to be gh-pages.
  • All other GitHub pages gotchas apply (CNAME, etc).
  • Edit everything in _data/ - this holds all 'config' for the site: ad IDs, strings, etc.
  • Edit _config.yml as well, lots of things may not apply to you.

CloudFlare purging

The site devhints.io is backed by CloudFlare. Updates will take 2 days to propagate to the website by default. To make sure recent changes will propagate, use this helper script. It will give instructions on how manual selective cache purging can be done.

./_support/cf-purge.sh

SEO description

There are multiple ways to set meta description.

keywords (and intro)

Set keywords (and optionally intro). This is the easiest and the preferred way for now.

React cheatsheet - devhints.io
------------------------------
https://devhints.io/react ▼
React.Component · render() · componentDidMount() · props/state · React is a
JavaScript library for building web...

description (and intro)

Set description (and optionally intro)

React cheatsheet - devhints.io
------------------------------
https://devhints.io/react ▼
One-page reference to React and its API. React is a JavaScript library for
building web user interfaces...

intro only

If you left out description or keywords, a default description will be added.

Critical path CSS

The critical path CSS is stored in:

  • _includes/2017/critical/home.html
  • _includes/2017/critical/sheet.html

You'll need to update these every now and then when you change something in the CSS. Use this to update these snippets:

yarn run critical

You can temporarily disable critical path optimizations by loading it with ?nocrit=1, eg, https://devhints.io/?nocrit=1.

Critical path JS

There's JavaScript that's included inline in every page. It's entrypoint is:

  • _js/critical.js

This is automatically compiled into the partial _includes/2017/critical/critical.js. Keep this bundle as small as possible.