Add simple custom pre-commit script

package.json

@@ -8,6 +8,7 @@
     "build": "tsc",
     "build:prod": "tsc -p tsconfig.prod.json",
     "test": "tsc && node --enable-source-maps --test --test-timeout=2500",
+    "test:clean": "rm -rf dist/ && npm run test",
     "coverage": "tsc && node --enable-source-maps --test --experimental-test-coverage --test-reporter=lcov --test-reporter-destination=lcov.info",
     "lint": "eslint src --ext .ts",
     "lint:fix": "eslint src --ext .ts --fix",

pre-commit

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+# The whole stashing dance based on: http://stackoverflow.com/a/20480591/1435658
+
+# First, stash index and work dir, keeping only the
+# to-be-committed changes in the working directory.
+# Will also stash uncommitted files
+old_stash=$(git rev-parse --quiet --verify refs/stash)
+git stash push --quiet --include-untracked --keep-index
+new_stash=$(git rev-parse --quiet --verify refs/stash)
+
+# Skip if nothing was stashed
+if [ "$old_stash" = "$new_stash" ]; then
+	exit 0
+fi
+
+# Restore the stash after the tests are run
+restore() {
+	git reset --hard --quiet && git stash pop --index --quiet
+}
+trap restore EXIT
+
+npm run format:check || exit 1
+npm run lint || exit 1
+npm run test:clean || exit 1