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webapp/version/getVersion.mjs

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+/**
+ * Entry function for get app version.
+ * In current implementation, it returns `version` from `package.json`, but you can implement any logic here.
+ * Runs several times for each vite configs and electron-builder config.
+ * @return {string}
+ */
+export function getVersion() {
+  return process.env.npm_package_version;
+}

webapp/version/inject-app-version-plugin.mjs

@@ -0,0 +1,12 @@
+import {getVersion} from './getVersion.mjs';
+
+/**
+ * Somehow inject app version to vite build context
+ * @return {import('vite').Plugin}
+ */
+export const injectAppVersion = () => ({
+  name: 'inject-version',
+  config: () => {
+    process.env.VITE_APP_VERSION = getVersion();
+  },
+});