fix(core): remove ngcc postinstall migration (#33727)

Partially address https://github.com/angular/angular-cli/issues/16017

PR Close #33727

packages/core/schematics/migrations/postinstall-ngcc/BUILD.bazel

@@ -1,16 +0,0 @@
-load("//tools:defaults.bzl", "ts_library")
-
-ts_library(
-    name = "postinstall-ngcc",
-    srcs = glob(["**/*.ts"]),
-    tsconfig = "//packages/core/schematics:tsconfig.json",
-    visibility = [
-        "//packages/core/schematics:__pkg__",
-        "//packages/core/schematics/test:__pkg__",
-    ],
-    deps = [
-        "@npm//@angular-devkit/core",
-        "@npm//@angular-devkit/schematics",
-        "@npm//@schematics/angular",
-    ],
-)

packages/core/schematics/migrations/postinstall-ngcc/README.md

@@ -1,22 +0,0 @@
-## Postinstall ngcc migration
-
-Automatically adds a postinstall script to `package.json` to run `ngcc`.
-If a postinstall script is already there and does not call `ngcc`, the call will be prepended.
-
-#### Before
-```json
-{
-  "scripts": {
-    "postinstall": "do-something"
-  }
-}
-```
-
-#### After
-```json
-{
-  "scripts": {
-    "postinstall": "ngcc ... && do-something"
-  }
-}
-```

packages/core/schematics/migrations/postinstall-ngcc/index.ts

@@ -1,79 +0,0 @@
-/**
- * @license
- * Copyright Google Inc. All Rights Reserved.
- *
- * Use of this source code is governed by an MIT-style license that can be
- * found in the LICENSE file at https://angular.io/license
- */
-
-import {JsonParseMode, parseJsonAst} from '@angular-devkit/core';
-import {Rule, SchematicContext, SchematicsException, Tree} from '@angular-devkit/schematics';
-import {NodePackageInstallTask} from '@angular-devkit/schematics/tasks';
-import {appendPropertyInAstObject, findPropertyInAstObject, insertPropertyInAstObjectInOrder} from '@schematics/angular/utility/json-utils';
-
-
-/**
- * Runs the ngcc postinstall migration for the current CLI workspace.
- */
-export default function(): Rule {
-  return (tree: Tree, context: SchematicContext) => {
-    addPackageJsonScript(
-        tree, 'postinstall',
-        'ngcc --properties es2015 browser module main --first-only --create-ivy-entry-points');
-    context.addTask(new NodePackageInstallTask());
-  };
-}
-
-function addPackageJsonScript(tree: Tree, scriptName: string, script: string): void {
-  const pkgJsonPath = '/package.json';
-
-  // Read package.json and turn it into an AST.
-  const buffer = tree.read(pkgJsonPath);
-  if (buffer === null) {
-    throw new SchematicsException('Could not read package.json.');
-  }
-  const content = buffer.toString();
-
-  const packageJsonAst = parseJsonAst(content, JsonParseMode.Strict);
-  if (packageJsonAst.kind != 'object') {
-    throw new SchematicsException('Invalid package.json. Was expecting an object.');
-  }
-
-  // Begin recording changes.
-  const recorder = tree.beginUpdate(pkgJsonPath);
-  const scriptsNode = findPropertyInAstObject(packageJsonAst, 'scripts');
-
-  if (!scriptsNode) {
-    // Haven't found the scripts key, add it to the root of the package.json.
-    appendPropertyInAstObject(
-        recorder, packageJsonAst, 'scripts', {
-          [scriptName]: script,
-        },
-        2);
-  } else if (scriptsNode.kind === 'object') {
-    // Check if the script is already there.
-    const scriptNode = findPropertyInAstObject(scriptsNode, scriptName);
-
-    if (!scriptNode) {
-      // Script not found, add it.
-      insertPropertyInAstObjectInOrder(recorder, scriptsNode, scriptName, script, 4);
-    } else {
-      // Script found, prepend the new script with &&.
-      const currentScript = scriptNode.value;
-      if (typeof currentScript == 'string') {
-        // Only add script if there's no ngcc call there already.
-        if (!currentScript.includes('ngcc')) {
-          const {start, end} = scriptNode;
-          recorder.remove(start.offset, end.offset - start.offset);
-          recorder.insertRight(start.offset, JSON.stringify(`${script} && ${currentScript}`));
-        }
-      } else {
-        throw new SchematicsException(
-            'Invalid postinstall script in package.json. Was expecting a string.');
-      }
-    }
-  }
-
-  // Write the changes.
-  tree.commitUpdate(recorder);
-}