use caches to speedup livereload

package.json

@@ -15,6 +15,7 @@
     "@babel/preset-flow": "^7.0.0",
     "@babel/preset-react": "^7.0.0",
     "babel-loader": "^8.0.6",
+    "cache-loader": "^4.1.0",
     "css-loader": "^3.2.0",
     "file-loader": "^4.2.0",
     "flow-mono-cli": "^1.5.0",

scm-ui/scripts/webpack.config.js

@@ -29,10 +29,13 @@ module.exports = {
         test: /\.(js|jsx)$/,
         exclude: /node_modules/,
         use: [{
+          loader: "cache-loader"
+        },{
           loader: "thread-loader"
         }, {
           loader: "babel-loader",
           options: {
+            cacheDirectory: true,
             presets: [
               "@babel/preset-env",
               "@babel/preset-react",

yarn.lock

@@ -1940,6 +1940,11 @@ buffer-indexof@^1.0.0:
   resolved "https://registry.yarnpkg.com/buffer-indexof/-/buffer-indexof-1.1.1.tgz#52fabcc6a606d1a00302802648ef68f639da268c"
   integrity sha512-4/rOEg86jivtPTeOUUT61jJO1Ya1TrR/OkqCSZDyq84WJh3LuuiphBYJN+fm5xufIk4XAFcEwte/8WzC8If/1g==
 
+buffer-json@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/buffer-json/-/buffer-json-2.0.0.tgz#f73e13b1e42f196fe2fd67d001c7d7107edd7c23"
+  integrity sha512-+jjPFVqyfF1esi9fvfUs3NqM0pH1ziZ36VP4hmA/y/Ssfo/5w5xHKfTw9BwQjoJ1w/oVtpLomqwUHKdefGyuHw==
+
 buffer-xor@^1.0.3:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/buffer-xor/-/buffer-xor-1.0.3.tgz#26e61ed1422fb70dd42e6e36729ed51d855fe8d9"
@@ -2049,6 +2054,18 @@ cache-base@^1.0.1:
     union-value "^1.0.0"
     unset-value "^1.0.0"
 
+cache-loader@^4.1.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/cache-loader/-/cache-loader-4.1.0.tgz#9948cae353aec0a1fcb1eafda2300816ec85387e"
+  integrity sha512-ftOayxve0PwKzBF/GLsZNC9fJBXl8lkZE3TOsjkboHfVHVkL39iUEs1FO07A33mizmci5Dudt38UZrrYXDtbhw==
+  dependencies:
+    buffer-json "^2.0.0"
+    find-cache-dir "^3.0.0"
+    loader-utils "^1.2.3"
+    mkdirp "^0.5.1"
+    neo-async "^2.6.1"
+    schema-utils "^2.0.0"
+
 cacheable-request@^2.1.1:
   version "2.1.4"
   resolved "https://registry.yarnpkg.com/cacheable-request/-/cacheable-request-2.1.4.tgz#0d808801b6342ad33c91df9d0b44dc09b91e5c3d"