mirror of https://github.com/status-im/reagent.git
109 lines
4.4 KiB
Markdown
109 lines
4.4 KiB
Markdown
# 0.8 Upgrade guide
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The necessary changes depend on what environment you target, and
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how you want to provide React.
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| | Build | Browser | Node |
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|---|---|---|---|
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| Cljsjs | `:none` | Supported | Requires Cljs 1.10.238+ |
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| Cljsjs | `:advanced` | Supported | Requires Cljs 1.10.238+ |
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| `node modules` | `:none` | Known problems (1) | Supported |
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| `node modules` | `:advanced` | Known problems (2) | Supported |
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While Reagent 0.8 supports use with React from npm, there are known problems:
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1. Closure can't properly handle React 16 CommonJS module pattern: https://github.com/google/closure-compiler/issues/2841
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This causes the production React code being loaded even for development builds.
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Using Chrome React Developer Tools with this setup will break Reagent.
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2. Closure optimization currently breaks certain statically created objects which are
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accessed dynamically in `ReactDOM/server`: https://github.com/facebook/react/issues/12368
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Fixed by using `[com.google.javascript/closure-compiler-unshaded "v20180319"]` ([fix commit](https://github.com/google/closure-compiler/commit/c13cf48b98477e44409dba6359246bffa95b1c7b)), will be
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the default in next ClojureScript release.
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## Browser - Cljsjs
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**This is the recommended setup.**
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Using Reagent with Cljsjs packages doesn't require changes,
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other than making sure you update Cljsjs React dependencies,
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if you have direct dependencies to them.
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To ensure Cljsjs libs are used instead of Node Modules, you can add `:npm-deps false`, which will make sure ClojureScript compiler doesn't look into `node_modules` directory if it exists.
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## Browser - node modules
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If `react`, `react-dom` and `create-react-class` are available in `node_modules`
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directory, ClojureScript compiler will use these with Reagent.
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If you don't want to call `npm` and manage `package.json`, you can use `:npm-deps` and `:install-deps` compiler options to
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have ClojureScript install the packages automatically.
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You can use `:process-shim` compiler option to provide `process.env.NODE_ENV`
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constant which is used by JS code to enable development and production
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builds. ClojureScript compiler will automatically set this constant to
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`production` value when using `:advanced` optimizations. This enables
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the React production build.
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When using module processing, it should be possible to split output into several
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[modules](https://clojurescript.org/reference/compiler-options#modules).
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**Externs are required for use with node modules also!** React created objects
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statically in several places and then accesses those dynamically. Closure-compiler
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will in these cases rename the statically object properties, which will break
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dynamically accessing the objects. Externs fix this by defining which properties
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must not be renamed.
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## Browser - loading React from CDNJS or custom Webpack bundle
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**TODO: Not tested properly**
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If you want to load React.js yourself from external JS file (CDN) or from custom bundle,
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it should be possible to override the Cljsjs foreign-libs, while still using externs from Cljsjs packages. To override the foreign-libs, you can provide following compiler option:
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```clj
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:foreign-libs
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[{:file "empty.js",
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:provides ["react" "react-dom" "create-react-class" "react-dom/server"],
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:requires [],
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:global-exports {react React
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react-dom ReactDOM
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create-react-class createReactClass
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react-dom/server ReactDOMServer}}]
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```
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You'll also need to create the mentioned `empty.js` file (FIXME: relative to `project.clj`?).
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If your bundle provides other libraries, you could extern `:provides` and `:global-exports` (e.g. `prop-types`).
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## NodeJS - Cljsjs
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Requires https://github.com/clojure/clojurescript/commit/f7d611d87f6ea8a605eae7c0339f30b79a840b49
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Available in 1.0.238
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Reagent should use Cljsjs libraries by default even when running on Node.
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## NodeJS - node modules
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Install `react`, `react-dom` and `create-react-class` npm packages,
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and ClojureScript should automatically use `require` to
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load React for Reagent.
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## Electron
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???
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## React-native
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https://github.com/drapanjanas/re-natal/issues/128
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## Common Problems
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### Mismatch with Cljsjs and npm packages
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If you have one npm package installed, e.g. `react`, you also need
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to provide others (`react-dom` and `create-react-class`), else
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Cljsjs packages would be used for these, and packages from different sources
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don't work together.
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