Initial commit

.babelrc

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+{
+  "presets": [
+    "es2015"
+  ],
+  "plugins": [
+    "transform-object-rest-spread"
+  ]
+}

.eslintrc.json

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+{
+  "env": {
+    "node": true,
+    "es6": true
+  },
+  "extends": "airbnb",
+  "parserOptions": {
+    "ecmaFeatures": {
+      "experimentalObjectRestSpread": true
+    }
+  },
+  "rules": {
+    "no-console": 0,
+    "no-mixed-operators": 0,
+    "react/require-extension": 0,
+    "arrow-body-style": 0,
+    "no-confusing-arrow": 0,
+    "import/prefer-default-export": 0,
+    "new-cap": 0,
+    "no-underscore-dangle": 0,
+    "camelcase": 0,
+    "no-else-return": 0,
+    "no-process-env": 2,
+    "quotes": [1, "double"],
+    "no-console": [2, { "allow": ["error"] }]
+  }
+}

.gitignore

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+.env
+node_modules/

app/config/index.js

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+/* eslint no-process-env: 0 */
+import varium from "varium";
+
+module.exports = varium(process.env, "env.manifest");

app/index.js

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+/* eslint no-process-env: 0 */
+
+import ws from "ws";
+import url from "url";
+import config from "./config";
+
+const updateConfig = (webSocket, environment) => {
+  webSocket.send(environment);
+};
+
+export const startUpdateConfig = (environment) => {
+  const connect = () => {
+    const webSocket = new ws(url.resolve(config.get("CONFIG_SERVICE_URL"), environment));
+
+    webSocket.on("open", () => {
+      updateConfig(webSocket, environment);
+      setInterval(
+        updateConfig,
+        config.get("INTERVAL"),
+        webSocket,
+        environment,
+      );
+    });
+
+    webSocket.on("message", (message) => {
+      process.env = {
+        ...process.env,
+        ...JSON.parse(message),
+      };
+    });
+
+    webSocket.on("error", (error) => {
+      console.error("Error:", error);
+    });
+
+    webSocket.on("close", () => {
+      console.error("Socket closed");
+      setTimeout(connect, 2000);
+    });
+  };
+
+  connect();
+};
+
+startUpdateConfig("dev");

env.manifest

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+INTERVAL : Int
+CONFIG_SERVICE_URL : String

index.js

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+require("babel-register");
+require("./app");

package.json

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+{
+  "name": "next-config-applier",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "node .",
+    "dev-start": "nf run npm run test && nf run npm run start -s",
+    "test": "eslint --fix ."
+  },
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "babel-core": "^6.18.2",
+    "babel-plugin-transform-object-rest-spread": "^6.19.0",
+    "babel-preset-es2015": "^6.18.0",
+    "eslint": "^3.11.1",
+    "eslint-config-airbnb": "^13.0.0",
+    "eslint-plugin-import": "^2.2.0",
+    "eslint-plugin-jsx-a11y": "^2.2.3",
+    "eslint-plugin-react": "^6.7.1",
+    "foreman": "^2.0.0"
+  },
+  "dependencies": {
+    "babel-register": "^6.18.0",
+    "varium": "github:ahultgren/node-varium",
+    "ws": "^1.1.1"
+  }
+}