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

85 lines
3.1 KiB
TypeScript

/**
* @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) => {
context.logger.info('------ ngcc postinstall migration ------');
context.logger.info('This migration adds an ngcc invocation to npm/yarn\'s ');
context.logger.info('postinstall script. See more info here: ');
context.logger.info('https://v9.angular.io/guide/migration-ngcc');
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);
}