Release flow based on npm version (#29)

Author: ehdr

DEVELOPING.md

@@ -40,23 +40,16 @@ This gRPC library depends on the `protobuf-ts` package, which is not compatible
 
 ## How to publish
 
-Make sure that you're on a clean commit, and all version numbers have been updated.
+Make sure that you're on a clean commit, then:
 
 ```bash
-VERSION=0.0.X
-
-git tag modal-go/v$VERSION
-git push --tags
-GOPROXY=proxy.golang.org go list -m github.com/modal-labs/libmodal/modal-go@v$VERSION
+npm version patch  # will build, bump the version, commit, tag, push, and npm publish
 ```
 
 ```bash
-VERSION=0.0.X
-
-# Note: Edit package.json first
-npm run build
-npm publish
+GO_VERSION=0.0.X
 
-git tag modal-js/v$VERSION
+git tag modal-go/v$GO_VERSION
 git push --tags
+GOPROXY=proxy.golang.org go list -m github.com/modal-labs/libmodal/modal-go@v$GO_VERSION
 ```

modal-js/package.json

@@ -29,7 +29,10 @@
     "format:check": "prettier --check .",
     "lint": "eslint",
     "prepare": "scripts/gen-proto.sh",
-    "test": "vitest"
+    "test": "vitest",
+    "preversion": "(git update-index --really-refresh && git diff-index --quiet HEAD) || (echo 'You must commit all changes before running npm version' && exit 1)",
+    "version": "npm run build && git add package.json package-lock.json && git commit -m \"modal-js/v$npm_package_version\" && git tag modal-js/v$npm_package_version",
+    "postversion": "git push && git push --tags && npm publish"
   },
   "dependencies": {
     "long": "^5.3.1",