33 lines
2.1 KiB
Markdown
33 lines
2.1 KiB
Markdown
# re-frame-trace
|
|
|
|
A trace window for re-frame
|
|
|
|
## 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.png" height="400px">
|
|
|
|
## 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. Caveat usor [sic].
|
|
|
|
## Getting started
|
|
|
|
Compile your app with `:closure-defines: "re_frame.trace.trace_enabled_QMARK_" true` and `:preloads [day8.re-frame.trace.preload]`, e.g.
|
|
|
|
```cljs
|
|
{:builds
|
|
[{:id "dev"
|
|
:source-paths ["src" "dev"]
|
|
:compiler {...
|
|
:closure-defines {"re_frame.trace.trace_enabled_QMARK_" true}
|
|
:preloads [day8.re-frame.trace.preload]}}]}
|
|
```
|
|
|
|
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.
|
|
|
|
Now you can start up your application. Once it is loaded, press Ctrl+H to slide open the trace panel and enable tracing. When the panel is closed, tracing is disabled.
|