Replace source file version automagically with https://www.npmjs.com/package/pre-commit

package.json

{
  "scripts": {
    "bump-version": "FILE=\"src/typescript-node.ts\"; if [ \"$(git status --porcelain | grep \"^ M \"$FILE)\" = \"\" ]; then VERSION=$(node -p \"require('./package.json').version\") && sed \"s/VERSION = '\\([0-9]*\\.[0-9]*\\.[0-9]*\\)'/VERSION = '\"$VERSION\"'/\" $FILE > .tmp.ts && mv .tmp.ts $FILE && git add $FILE; fi"
  },
  "pre-commit": [
    "bump-version",
    "# test"
  ],
  "devDependencies": {
    "pre-commit": "^1.0.10"
  }
}

script.sh

# First, we want to make sure that the file we're updating is clean using git.
# Next, replace a string (here it's "VERSION = '0.0.6'") with the current package version from `package.json`.
FILE="src/typescript-node.ts"; if [ "$(git status --porcelain | grep "^ M "$FILE)" = "" ]; then VERSION=$(node -p "require('./package.json').version") && sed "s/VERSION = '\([0-9]*\.[0-9]*\.[0-9]*\)'/VERSION = '"$VERSION"'/" $FILE > .tmp.ts && mv .tmp.ts $FILE && git add $FILE; fi