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Update README.md

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Dexter Gramfors 2017-04-13 20:15:49 +02:00 committed by GitHub
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@ -16,16 +16,16 @@ re-frame has instrumentation to collect traces throughout various important poin
Compile your app with `:closure-defines: "re_frame.trace.trace_enabled_QMARK_" true` and `:preloads [day8.re-frame.trace.preload]`, e.g.
```cljs
```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.
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.