Repo standardization (#18)

* Enforcing minimum node version 12 via circleci, .nvmrc, and the package file
* Adding basic .gitattributes file
* Adding basic .editorconfig file
* Updating .gitignore file

* Adding CODEOWNERS file

.circleci/config.yml

@@ -18,7 +18,7 @@ workflows:
 jobs:
   prep-deps:
     docker:
-      - image: circleci/node:10
+      - image: circleci/node:12
     steps:
       - checkout
       - run:
@@ -37,7 +37,7 @@ jobs:
 
   test-lint:
     docker:
-      - image: circleci/node:10
+      - image: circleci/node:12
     steps:
       - checkout
       - attach_workspace:
@@ -48,7 +48,7 @@ jobs:
 
   test-unit:
     docker:
-      - image: circleci/node:10
+      - image: circleci/node:12
     steps:
       - checkout
       - attach_workspace:
@@ -59,7 +59,7 @@ jobs:
 
   all-tests-pass:
     docker:
-      - image: circleci/node:10
+      - image: circleci/node:12
     steps:
       - run:
           name: All tests passed

.editorconfig

@@ -0,0 +1,9 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

.gitattributes

@@ -0,0 +1,3 @@
+* text=auto
+
+yarn.lock linguist-generated=false

.github/CODEOWNERS

@@ -0,0 +1,4 @@
+# Lines starting with '#' are comments.
+# Each line is a file pattern followed by one or more owners.
+
+*                                    @MetaMask/devs

.gitignore

@@ -1,4 +1,6 @@
 npm-debug.log
+yarn-debug.log*
+yarn-error.log*
 node_modules
 package-lock.json
 dist/

.nvmrc

@@ -1 +1 @@
-v10
+v12

README.md

@@ -55,6 +55,12 @@ Note: releaseLock must be called after adding a signed tx to pending transaction
 
 Returns **[Promise][17]<NonceDetails>**
 
+## Running tests
+
+```bash
+yarn test
+```
+
 
 
 [13]: https://github.com/MetaMask/nonce-tracker/blob/587ee0b25e16543330830e71372e0a9b94c166c4/index.js#L13-L159 "Source code on GitHub"

package.json

@@ -3,6 +3,9 @@
   "version": "1.1.0",
   "description": "Transaction nonce calculation used in MetaMask.",
   "main": "dist/index.js",
+  "engines": {
+    "node": ">=12.0.0"
+  },
   "scripts": {
     "build": "rm -rf ./dist && tsc --project .",
     "test": "yarn build && mocha test/nonce-tracker-test.js",