From e53b57a642a40f8dfa61d991c915c40eae6d6bc7 Mon Sep 17 00:00:00 2001
From: dannyrb <danny.ri.brown@gmail.com>
Date: Fri, 10 May 2019 09:55:24 -0400
Subject: [PATCH] Configuration

---
 .../recipes/build-for-production.md           |  6 +-
 docs/latest/essentials/configuration.md       | 58 ++++++++++++++++++-
 2 files changed, 59 insertions(+), 5 deletions(-)

diff --git a/docs/latest/deployment/recipes/build-for-production.md b/docs/latest/deployment/recipes/build-for-production.md
index 92673e69a..37b675941 100644
--- a/docs/latest/deployment/recipes/build-for-production.md
+++ b/docs/latest/deployment/recipes/build-for-production.md
@@ -65,10 +65,8 @@ how to configure the project for your own imaging archive below.
 ### Configuration
 
 > This step assumes you have an imaging archive. If you need assistance setting
-> one up, check out the [`Data` section](./../index.md#data) of our Deployment
-> Guide, or `Getting Started`'s
-> ["Set up a local DICOM server"](./../../essentials/getting-started.md#set-up-a-local-dicom-server),
-> or a deployment recipe that contains an open source Image Archive
+> one up, check out the [`Data Source` Guide](./../essentials/data-source.md) or
+> a deployment recipe that contains an open source Image Archive
 
 #### How it Works
 
diff --git a/docs/latest/essentials/configuration.md b/docs/latest/essentials/configuration.md
index af4abbfe2..7017b4d97 100644
--- a/docs/latest/essentials/configuration.md
+++ b/docs/latest/essentials/configuration.md
@@ -1 +1,57 @@
-# Configuration
\ No newline at end of file
+# Configuration
+
+> This step assumes you have an imaging archive. If you need assistance setting
+> one up, check out the [`Data Source` Guide](./data-source.md) or a deployment
+> recipe that contains an open source Image Archive
+
+## How it Works
+
+The configuration for our project is in the `/public/config` directory. Our
+build process knows which configuration file to use based on the
+`REACT_APP_CONFIG` environment variable. By default, its value is
+[`default.js`](https://github.com/OHIF/Viewers/blob/react/public/config/default.js).
+When we build, the `%REACT_APP_CONFIG%` value in
+our[`/public/index.html`](https://github.com/OHIF/Viewers/blob/react/public/index.html#L12-L15)
+file is substituted for the correct configuration file's name. This sets the
+`window.config` equal to our configuration file's value.
+
+## How do I configure my project?
+
+The simplest way is to update the existing default config:
+
+_/public/config/default.js_
+
+```js
+window.config = {
+  routerBasename: '/',
+  relativeWebWorkerScriptsPath: '',
+  servers: {
+    dicomWeb: [
+      {
+        name: 'DCM4CHEE',
+        wadoUriRoot: 'https://server.dcmjs.org/dcm4chee-arc/aets/DCM4CHEE/wado',
+        qidoRoot: 'https://server.dcmjs.org/dcm4chee-arc/aets/DCM4CHEE/rs',
+        wadoRoot: 'https://server.dcmjs.org/dcm4chee-arc/aets/DCM4CHEE/rs',
+        qidoSupportsIncludeField: true,
+        imageRendering: 'wadors',
+        thumbnailRendering: 'wadors',
+        requestOptions: {
+          requestFromBrowser: true,
+        },
+      },
+    ],
+  },
+}
+```
+
+You can also create a new config file and specify its path relative to the build
+output's root by setting the `REACT_APP_CONFIG` environment variable. You can
+set the value of this environment variable a few different ways:
+
+- [Add a temporary environment variable in your shell](https://facebook.github.io/create-react-app/docs/adding-custom-environment-variables#adding-temporary-environment-variables-in-your-shell)
+- [Add environment specific variables in `.env` file(s)](https://facebook.github.io/create-react-app/docs/adding-custom-environment-variables#adding-development-environment-variables-in-env)
+- Using the `cross-env` package in an npm script:
+  - `"build": "cross-env REACT_APP_CONFIG=config/my-config.js react-scripts build"`
+
+After updating the configuration, `yarn run build:web` to generate updated build
+output.