using my boilerplate yuh

webpack/utils/convertSemver.ts

@@ -0,0 +1,22 @@
+import { parse } from 'semver';
+
+/**
+ * Converts npm semver-style strings (including pre-releases) to a release version compatible
+ * with the extension stores.
+ *
+ * @example
+ * semverVersionTo('1.0.0-beta.1`) returns 1.0.0.100
+ */
+export function convertSemver(version: string): string {
+    const semver = parse(version);
+    if (!semver) {
+        throw new Error(`Couldn't parse ${version}!`);
+    }
+
+    const { major, minor, patch, prerelease } = semver;
+    let manifestVersion = `${major}.${minor}.${patch}`;
+    if (prerelease.length) {
+        manifestVersion += `.${prerelease[1]}00`;
+    }
+    return manifestVersion;
+}