Lint changelog

Makefile

@@ -58,6 +58,7 @@ lint: node_modules
 	npx prettier . --check
 	npx tsc --project src --noEmit
 	hadolint Dockerfile
+	./scripts/lint_changelog.bash
 
 .PHONY: fix
 fix: node_modules

scripts/lint_changelog.bash

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+set -euo pipefail
+
+cd "$(dirname "$0")/.."
+
+main() {
+  has_current_version_chengelog
+  for file in changelog/*.md; do
+    should_start_with_version_header "$file"
+  done
+}
+
+has_current_version_chengelog() {
+  local v="$(node -e 'console.log(require("./package.json").version)')"
+  if ! [[ -f "changelog/$v.md" ]]; then
+    echo "changelog/$v.md does not exist"
+    exit 1
+  fi
+}
+
+should_start_with_version_header() {
+  local file="$1"
+  local v=$(basename "$file" .md)
+  if head -n1 "$file" | grep -vq "^# Version $v$"; then
+    echo "changelog/$v.md does not start with the correct version header"
+    exit 1
+  fi
+}
+
+main