fix: mark process and ng-env imports as having side effects (#66)

Currently the imports `import 'angular-server-side-configuration/process';` and `import 'angular-server-side-configuration/ng-env';` are removed by webpack tree shaking, which breaks the app, if variables are not inserted. The relevant files are now marked as containing side effects, which prevents webpack from removing the imports.

Author: kyubisation

scripts/build-lib.ts

@@ -1,5 +1,5 @@
 import { execSync } from 'child_process';
-import { lstatSync, readdirSync } from 'fs';
+import { lstatSync, readdirSync, writeFileSync } from 'fs';
 import { copyFile, mkdir, readFile, writeFile } from 'fs/promises';
 import { dirname, join, relative, resolve } from 'path';
 
@@ -68,6 +68,21 @@ async function finalizePackage() {
       stdio: 'inherit',
     });
   }
+
+  const distPackageJson = require('../dist/angular-server-side-configuration/package.json');
+  distPackageJson.sideEffects = [
+    './esm2020/ng-env/public_api.mjs',
+    './esm2020/process/public_api.mjs',
+    './fesm2015/angular-server-side-configuration-ng-env.mjs',
+    './fesm2015/angular-server-side-configuration-process.mjs',
+    './fesm2020/angular-server-side-configuration-ng-env.mjs',
+    './fesm2020/angular-server-side-configuration-process.mjs',
+  ];
+  writeFileSync(
+    join(__dirname, '../dist/angular-server-side-configuration/package.json'),
+    JSON.stringify(distPackageJson, null, 2),
+    'utf8'
+  );
 }
 
 function walk(root: string | string[], fileRegex: RegExp): string[] {