build: use standard-version to automate version bumping

Author: h4l

.ts_module_version_updater.js

@@ -0,0 +1,23 @@
+// This module is used by standard-version to read/write the VERSION constant in
+// our .ts files.
+
+const VERSION_PATTERN =
+  /(?<=^export const VERSION = ")(\d+\.\d+\.\d+)(?="; \/\/ managed by standard-version, do not modify$)/m;
+
+module.exports.readVersion = function (contents) {
+  const match = VERSION_PATTERN.exec(contents);
+  if (!match) {
+    throw new Error(
+      `Failed to find version, no match for pattern: ${VERSION_PATTERN}`,
+    );
+  }
+  return match[0];
+};
+
+module.exports.writeVersion = function (contents, version) {
+  // ensure contents has a match for the pattern
+  if (module.exports.readVersion(contents) === version) {
+    return contents;
+  }
+  return contents.replace(VERSION_PATTERN, version);
+};

.versionrc.json

@@ -0,0 +1,8 @@
+{
+  "bumpFiles": [
+    {
+      "filename": "mod.ts",
+      "updater": ".ts_module_version_updater.js"
+    }
+  ]
+}

mod.ts

@@ -5,6 +5,7 @@
  * [RFC 7464]: https://datatracker.ietf.org/doc/html/rfc7464
  */
 
+export const VERSION = "0.0.0"; // managed by standard-version, do not modify
 export const JSON_SEQ_START = "\x1E";
 export const JSON_SEQ_END = "\n";