fix: embed version at compile time (#237)

Removes requiring version at runtime with require: 3615f15#diff-258035e5968f6bf645400d417f310218d7d9a9a10606a3c34e7f55db193f58f3R3

Instead we're using the rollup replace plugin to read the version at build time and replace __VERSION__ placeholder with the actual version number.

As a result other packages depending on this one don't need to understand require calls and also we're not exposing the whole package.json file at runtime.

To verify my claim above you can build the package and check the build directory after this change vs before this change.

.gitignore

@@ -3,3 +3,4 @@ node_modules/
 .vscode/
 coverage/
 .idea
+.DS_Store

package.json

@@ -46,6 +46,7 @@
     "@babel/runtime": "^7.23.1",
     "@rollup/plugin-commonjs": "^25.0.5",
     "@rollup/plugin-node-resolve": "^15.2.3",
+    "@rollup/plugin-replace": "^6.0.2",
     "@rollup/plugin-terser": "^0.4.4",
     "@rollup/plugin-typescript": "^11.1.5",
     "@types/jest": "^29.5.5",

rollup.config.mjs

@@ -3,6 +3,10 @@ import nodeResolve from '@rollup/plugin-node-resolve';
 import commonjs from '@rollup/plugin-commonjs';
 import terser from '@rollup/plugin-terser';
 import nodePolyfills from 'rollup-plugin-node-polyfills';
+import replace from '@rollup/plugin-replace';
+import fs from 'fs';
+
+const version = JSON.parse(fs.readFileSync('./package.json', 'UTF-8')).version;
 
 export default {
     input: './src/index.ts',
@@ -25,6 +29,10 @@ export default {
         }
     ],
     plugins: [
+        replace({
+            '__VERSION__': version,
+            preventAssignment: true
+        }),
         typescript({
             compilerOptions: {
                 lib: ['es5', 'es6', 'dom'],

src/index.test.ts

@@ -1,6 +1,4 @@
 import { FetchMock } from 'jest-fetch-mock';
-// eslint-disable-next-line @typescript-eslint/no-var-requires
-const packageJSON = require('../package.json');
 import 'jest-localstorage-mock';
 import * as data from './test/testdata.json';
 import IStorageProvider from './storage-provider';
@@ -1383,7 +1381,8 @@ test('Should add `x-unleash` headers', async () => {
         /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
 
     const expectedHeaders = {
-        'x-unleash-sdk': `unleash-js@${packageJSON.version}`,
+        // will be replaced at build time with the actual version
+        'x-unleash-sdk': 'unleash-js@__VERSION__',
         'x-unleash-connection-id': expect.stringMatching(uuidFormat),
         'x-unleash-appname': appName,
     };

src/index.ts

@@ -10,9 +10,7 @@ import {
     notNullOrUndefined,
     urlWithContextAsQuery,
 } from './util';
-
-// eslint-disable-next-line @typescript-eslint/no-var-requires
-const packageJSON = require('../package.json');
+import { sdkVersion } from './version';
 
 const DEFINED_FIELDS = [
     'userId',
@@ -476,7 +474,7 @@ export class UnleashClient extends TinyEmitter {
         const headers = {
             [this.headerName]: this.clientKey,
             Accept: 'application/json',
-            'x-unleash-sdk': `unleash-js@${packageJSON.version}`,
+            'x-unleash-sdk': sdkVersion,
             'x-unleash-connection-id': this.connectionId,
             'x-unleash-appname': this.context.appName,
         };

src/metrics.ts

@@ -1,8 +1,7 @@
 // Simplified version of: https://github.com/Unleash/unleash-client-node/blob/main/src/metrics.ts
 
 import { notNullOrUndefined } from './util';
-// eslint-disable-next-line @typescript-eslint/no-var-requires
-const packageJSON = require('../package.json');
+import { sdkVersion } from './version';
 
 export interface MetricsOptions {
     onError: OnError;
@@ -127,7 +126,7 @@ export default class Metrics {
             [this.headerName]: this.clientKey,
             Accept: 'application/json',
             'Content-Type': 'application/json',
-            'x-unleash-sdk': `unleash-js@${packageJSON.version}`,
+            'x-unleash-sdk': sdkVersion,
             'x-unleash-connection-id': this.connectionId,
             'x-unleash-appname': this.appName,
         };

src/version.ts

@@ -0,0 +1 @@
+export const sdkVersion = `unleash-js@__VERSION__`;

yarn.lock

@@ -642,6 +642,14 @@
     is-module "^1.0.0"
     resolve "^1.22.1"
 
+"@rollup/plugin-replace@^6.0.2":
+  version "6.0.2"
+  resolved "https://registry.yarnpkg.com/@rollup/plugin-replace/-/plugin-replace-6.0.2.tgz#2f565d312d681e4570ff376c55c5c08eb6f1908d"
+  integrity sha512-7QaYCf8bqF04dOy7w/eHmJeNExxTYwvKAmlSAH/EaWWUzbT0h5sbF6bktFoX/0F/0qwng5/dWFMyf3gzaM8DsQ==
+  dependencies:
+    "@rollup/pluginutils" "^5.0.1"
+    magic-string "^0.30.3"
+
 "@rollup/plugin-terser@^0.4.4":
   version "0.4.4"
   resolved "https://registry.yarnpkg.com/@rollup/plugin-terser/-/plugin-terser-0.4.4.tgz#15dffdb3f73f121aa4fbb37e7ca6be9aeea91962"
@@ -2977,9 +2985,9 @@ rollup-pluginutils@^2.8.1:
     estree-walker "^0.6.1"
 
 rollup@^3.29.4:
-  version "3.29.4"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-3.29.4.tgz#4d70c0f9834146df8705bfb69a9a19c9e1109981"
-  integrity sha512-oWzmBZwvYrU0iJHtDmhsm662rC15FRXmcjCk1xD771dFDx5jJ02ufAQQTn0etB2emNk4J9EZg/yWKpsn9BWGRw==
+  version "3.29.5"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-3.29.5.tgz#8a2e477a758b520fb78daf04bca4c522c1da8a54"
+  integrity sha512-GVsDdsbJzzy4S/v3dqWPJ7EfvZJfCHiDqe80IyrF59LYuP+e6U1LJoUqeuqRbwAWoMNoXivMNeNAOf5E22VA1w==
   optionalDependencies:
     fsevents "~2.3.2"