build: publish tree of files rather than FESMs (#18541)

* Remove now unnecessary portions of build.
* Add a compilePackageES5 method to build ES5 from sources
* Rework all package.json and rollup config files to new format
* Remove "extends" from tsconfig-build.json files and fixup compilation roots

PR Close #18541

packages/upgrade/static/package.json

@@ -1,7 +1,7 @@
 {
   "name": "@angular/upgrade/static",
-  "typings": "../static.d.ts",
+  "typings": "./index.d.ts",
   "main": "../bundles/upgrade-static.umd.js",
-  "module": "../@angular/upgrade/static.es5.js",
-  "es2015": "../@angular/upgrade/static.js"
+  "module": "../esm5/static/index.js",
+  "es2015": "../esm15/static/index.js"
 }

packages/upgrade/static/public_api.ts

@@ -9,7 +9,7 @@
 /**
  * @module
  * @description
- * Entry point for all public APIs of the upgrade/static package, allowing
+ * Entry point for all public APIs of this package. allowing
  * Angular 1 and Angular 2+ to run side by side in the same application.
  */
 export {getAngularLib, setAngularLib} from './src/common/angular1';

packages/upgrade/static/rollup.config.js

@@ -7,18 +7,19 @@
  */
 
 import resolve from 'rollup-plugin-node-resolve';
+import sourcemaps from 'rollup-plugin-sourcemaps';
 
 const globals = {
   '@angular/core': 'ng.core'
 };
 
 export default {
-  entry: '../../../dist/packages-dist/upgrade/@angular/upgrade/static.es5.js',
+  entry: '../../../dist/packages-dist/upgrade/esm5/static/index.js',
   dest: '../../../dist/packages-dist/upgrade/bundles/upgrade-static.umd.js',
   format: 'umd',
   exports: 'named',
   moduleName: 'ng.upgrade.static',
-  plugins: [resolve()],
+  plugins: [resolve(), sourcemaps()],
   external: Object.keys(globals),
   globals: globals
 };

packages/upgrade/static/tsconfig-build.json

@@ -1,18 +1,23 @@
 {
-  "extends": "../tsconfig-build",
+  "extends": "../tsconfig-build.json",
+
   "compilerOptions": {
-    "target": "es5",
+    "baseUrl": ".",
+    "rootDir": "../",
     "paths": {
-      "@angular/core": ["../../dist/packages/core"],
-      "@angular/common": ["../../dist/packages/common"],
-      "@angular/platform-browser": ["../../dist/packages/platform-browser"],
-      "@angular/platform-browser-dynamic": ["../../dist/packages/platform-browser-dynamic"]
-    }
+      "@angular/core": ["../../../dist/packages/core"],
+      "@angular/common": ["../../../dist/packages/common"],
+      "@angular/platform-browser": ["../../../dist/packages/platform-browser"],
+      "@angular/platform-browser-dynamic": ["../../../dist/packages/platform-browser-dynamic"]
+    },
+    "outDir": "../../../dist/packages/upgrade"
   },
+
   "files": [
     "public_api.ts",
     "../../../node_modules/zone.js/dist/zone.js.d.ts"
   ],
+
   "angularCompilerOptions": {
     "flatModuleOutFile": "index.js",
     "flatModuleId": "@angular/upgrade/static"