fix(schematics): don't override ng-packagr generated package.json during build

Author: tomastrajan

schematics/ng-add/index.ts

@@ -1,14 +1,13 @@
 import { Rule, SchematicContext, Tree } from '@angular-devkit/schematics';
 import { NodePackageInstallTask } from '@angular-devkit/schematics/tasks';
 
-import packageJson from '../../package.json';
-import { addPackageToPackageJson } from '../utils';
+import { addPackageToPackageJson, getLibraryVersion } from '../utils';
 
 import { Schema as NgAddOptions } from './schema';
 
 export default function(options: NgAddOptions): Rule {
   return (host: Tree, context: SchematicContext) => {
-    const version = packageJson.version;
+    const version = getLibraryVersion();
     addPackageToPackageJson(host, '@angular-extensions/model', `^${version}`);
     context.logger.log(
       'info',

schematics/utils.ts

@@ -1,5 +1,13 @@
+import fs from 'fs';
+import path from 'path';
 import { Tree } from '@angular-devkit/schematics';
 
+export function getLibraryVersion() {
+  return JSON.parse(
+    fs.readFileSync(path.join(__dirname, '../package.json'), 'utf8')
+  ).version;
+}
+
 export function addPackageToPackageJson(
   host: Tree,
   pkg: string,