78 lines
3.5 KiB
Markdown
78 lines
3.5 KiB
Markdown
# re-frame-trace
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A trace panel for re-frame.
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[](https://clojars.org/day8.re-frame/trace)
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**Status:** Alpha.
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## Motivation
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re-frame provides a data driven architecture, but we need to be able to inspect it. re-frame-trace takes inspiration from [redux-devtools](https://github.com/gaearon/redux-devtools), and provides several ways to visualise the structure and state of your re-frame application.
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<img src="docs/images/trace-window.gif" height="400px">
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## Installation
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If you are using leiningen, modify `project.clj` in the following ways. When puzzling over the various possible leiningen configurations, it's often helpful to look at a sample [project.clj](https://github.com/technomancy/leiningen/blob/stable/sample.project.clj).
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[](https://clojars.org/day8.re-frame/trace)
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- Add re-frame-trace as a dev dependency by placing `[day8.re-frame/trace "VERSION"]` within `:profiles :dev :dependencies`. For example:
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```cljs
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:profiles
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{:dev
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{:dependencies [[some-other-package "0.0.0"]
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[day8.re-frame/trace "0.0.0 (see version above)"]] }}
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```
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- Locate the `:compiler` map under `:dev` and add:
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- `:closure-defines {"re_frame.trace.trace_enabled_QMARK_" true}`
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- `:preloads [day8.re-frame.trace.preload]`
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For example:
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```cljs
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{:builds
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[{:id "dev"
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:source-paths ["src" "dev"]
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:compiler {...
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:closure-defines {"re_frame.trace.trace_enabled_QMARK_" true}
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:preloads [day8.re-frame.trace.preload]}}]}
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```
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[cljs-devtools](https://github.com/binaryage/cljs-devtools) is not required to use re-frame-trace, but it is highly recommended.
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## Usage
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- **Make sure you have followed all of the installation instructions above.**
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- Start up your application.
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- Once it is loaded, focus the document window and press `ctrl-h` to slide open the trace panel and enable tracing.
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- When the panel is closed, tracing is disabled.
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## Troubleshooting
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* Try a `lein clean`
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* Make sure you have followed all the installation steps.
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## How does it work?
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re-frame has instrumentation to collect traces throughout various important points in the lifecycle of a re-frame app. re-frame-trace is a consumer of these traces, and provides visualisations of the traces. These traces have a well-defined structure, and will eventually be standardised, allowing other developers to create their own tooling to work against the traces. Currently, re-frame's tracing and re-frame-trace are in alpha and are subject to change at any time.
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By default, re-frame tracing is compiled out, so it won't impose a performance cost in production. The trade-off here is that you need to explicitly enable it in development.
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The [preloads](https://github.com/clojure/clojurescript/wiki/Compiler-Options#preloads) option (`:preloads [day8.re-frame.trace.preload]`) has to be set in order to automatically monkeypatch Reagent to add appropriate lifecycle hooks. Yes this is gross, and yes we will try and make a PR to reagent to add proper hooks, once we know exactly what we need. The preload namespace also injects a div containing the devtools panel into the DOM.
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## Developing/Contributing
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If you want to work on re-frame-trace, see [DEVELOPERS.md](DEVELOPERS.md).
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## Citations
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[open](https://thenounproject.com/search/?q=popout&i=334227) by Bluetip Design from the Noun Project
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