Improve the build and push scripts.

build-package.sh

@@ -1,4 +1,6 @@
 #!/bin/bash
 
+. ./pre-check.sh
+
 tsc
 npm pack

pre-check.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+branch=$(git rev-parse --abbrev-ref HEAD)
+
+if [[ "${branch}" != "master" ]]; then
+  echo "This script can only be run on the master branch. Current branch is ${branch}"
+  exit 1
+fi
+
+if ! git diff --quiet; then
+  echo "This script must only run on a clean master branch."
+  echo
+  git status
+  exit 1
+fi
+
+untracked=$(git ls-files --exclude-standard --others)
+
+if [[ "${untracked}" != "" ]]; then
+  echo "This script requires no untracked files."
+  echo
+  git status
+  exit 1
+fi

push-package.sh

@@ -4,6 +4,8 @@ if [[ "${1}x" == "x" ]]; then
   exit 1
 fi
 
+. ./pre-check.sh
+
 git tag ${1}
 git push upstream ${tag}