Adding prettier.

ui/.prettierrc.js

@@ -0,0 +1,4 @@
+module.exports = Object.assign(require('eslint-plugin-jane/prettier-ts'), {
+  arrowParens: 'avoid',
+  semi: true,
+});

ui/package.json

@@ -32,6 +32,7 @@
     "markdown-it-container": "^2.0.0",
     "markdown-it-emoji": "^1.4.0",
     "moment": "^2.24.0",
+    "prettier": "^1.18.2",
     "rxjs": "^6.4.0",
     "terser": "^3.17.0",
     "tributejs": "3.7.2",
@@ -58,18 +59,24 @@
   "husky": {
     "hooks": {
       "pre-commit": "lint-staged",
-      "pre-push": "npm run lint"
+      "pre-push": "yarn run lint"
     }
   },
   "lint-staged": {
     "*.js": [
-      "npm run lint"
+      "prettier --write",
+      "yarn run lint",
+      "git add"
     ],
     "*.ts": [
-      "npm run lint"
+      "prettier --write",
+      "yarn run lint",
+      "git add"
     ],
     "*.tsx": [
-      "npm run lint"
+      "prettier --write",
+      "yarn run lint",
+      "git add"
     ],
     "package.json": [
       "sortpack",

ui/yarn.lock

@@ -4177,6 +4177,11 @@ prettier-linter-helpers@^1.0.0:
   dependencies:
     fast-diff "^1.1.2"
 
+prettier@^1.18.2:
+  version "1.18.2"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.18.2.tgz#6823e7c5900017b4bd3acf46fe9ac4b4d7bda9ea"
+  integrity sha512-OeHeMc0JhFE9idD4ZdtNibzY0+TPHSpSSb9h8FqtP+YnoZZ1sl8Vc9b1sasjfymH3SonAF4QcA2+mzHPhMvIiw==
+
 pretty-time@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/pretty-time/-/pretty-time-0.2.0.tgz#7a3bdec4049c620cd7c42b7f342b74d56e73d74e"