74 lines
3.4 KiB
Markdown
74 lines
3.4 KiB
Markdown
# re-frame-trace
|
|
|
|
A trace panel for re-frame.
|
|
|
|
[](https://clojars.org/day8.re-frame/trace)
|
|
|
|
**Status:** Alpha.
|
|
|
|
## Motivation
|
|
|
|
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.
|
|
|
|
<img src="docs/images/trace-window.gif" height="400px">
|
|
|
|
## Installation
|
|
|
|
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).
|
|
|
|
[](https://clojars.org/day8.re-frame/trace)
|
|
|
|
- Add re-frame-trace as a dev dependency by placing `[day8.re-frame/trace "VERSION"]` within `:profiles :dev :dependencies`. For example:
|
|
|
|
```cljs
|
|
:profiles
|
|
{:dev
|
|
{:dependencies [[some-other-package "0.0.0"]
|
|
[day8.re-frame/trace "0.0.0 (see version above)"]] }}
|
|
```
|
|
|
|
- Locate the `:compiler` map under `:dev` and add:
|
|
|
|
- `:closure-defines {"re_frame.trace.trace_enabled_QMARK_" true}`
|
|
- `:preloads [day8.re-frame.trace.preload]`
|
|
|
|
For example:
|
|
|
|
```cljs
|
|
{:builds
|
|
[{:id "dev"
|
|
:source-paths ["src" "dev"]
|
|
:compiler {...
|
|
:closure-defines {"re_frame.trace.trace_enabled_QMARK_" true}
|
|
:preloads [day8.re-frame.trace.preload]}}]}
|
|
```
|
|
|
|
[cljs-devtools](https://github.com/binaryage/cljs-devtools) is not required to use re-frame-trace, but it is highly recommended.
|
|
|
|
## Usage
|
|
|
|
- **Make sure you have followed all of the installation instructions above.**
|
|
|
|
- Start up your application.
|
|
|
|
- Once it is loaded, focus the document window and press `ctrl-h` to slide open the trace panel and enable tracing.
|
|
|
|
- When the panel is closed, tracing is disabled.
|
|
|
|
## Troubleshooting
|
|
|
|
* Try a `lein clean`
|
|
* Make sure you have followed all the installation steps.
|
|
|
|
## How does it work?
|
|
|
|
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.
|
|
|
|
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.
|
|
|
|
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.
|
|
|
|
## Developing/Contributing
|
|
|
|
If you want to work on re-frame-trace, see [DEVELOPERS.md](DEVELOPERS.md).
|