ClassOptions 架构 - Angular 架构

Question

在@angular-devkit/schematics readme 中，我对 ClassOptions 的作用感到困惑。

如果将代码添加到项目中，将显示错误，因为该文件不存在。

关于它的用途的想法+示例？

import { strings } from '@angular-devkit/core';
import {
  Rule, SchematicContext, SchematicsException, Tree,
  apply, branchAndMerge, mergeWith, template, url,
} from '@angular-devkit/schematics';
import { Schema as ClassOptions } from './schema';

export default function (options: ClassOptions): Rule {
  return (tree: Tree, context: SchematicContext) => {
    if (!options.name) {
      throw new SchematicsException('Option (name) is required.');
    }

    const templateSource = apply(
      url('./files'),
      [
        template({
          ...strings,
          ...options,
        }),
      ]
    );

    return branchAndMerge(mergeWith(templateSource));
  };
}

Answer 1

示例中的schema文件是用this function during a build process in angular-cli. It's a pattern used in angular-cli and the example won't work as it is. You can see a complete example of the source for a schematic like this in one of the official angular schematics like service生成的打字稿文件。

但是请记住，ClassOptions 只是一个为 Angular 示意图指定选项的对象。它可以来自任何地方，并且与原理图库解耦。它是 responsibility of the tooling 提供原理图库的选项。

这是一个使用 reference cli 的类似示例。

生成简单原理图：

schematics blank --name=test

将架构文件的路径添加到 collection.json:

{
  "$schema": "../node_modules/@angular-devkit/schematics/collection-schema.json",
  "schematics": {
    "test": {
      "description": "A blank schematic.",
      "factory": "./test/index#test",
      "schema": "./test/schema.json"
    }
  }
}

创建 schema.json:

{
    "$schema": "http://json-schema.org/schema",
    "id": "MySchema",
    "title": "My Schema",
    "type": "object",
    "properties": {
        "name": {
            "type": "string",
            "default": "cactus"
        }
    }
}

index.ts 中的工厂现在将从 schema.json 文件中获取默认选项。

import { Rule, SchematicContext, Tree } from "@angular-devkit/schematics";

// You don't have to export the function as default. You can also have more than one rule factory
// per file.
export function test(_options: any): Rule {
    return (tree: Tree, _context: SchematicContext) => {
        tree.create(_options.name || "hello", "world");
        return tree;
    };
}

运行默认值来自 schema.json:

的 cli

schematics .:test --dry-run=false
...
CREATE /cactus (5 bytes)

运行具有用户定义选项的 cli：

schematics .:test --name=bean--dry-run=false
...
CREATE /bean (5 bytes)

ClassOptions 架构 - Angular 架构

ClassOptions Schema - Angular Schematics

angular-cli

angular

angular-schematics

angular-devkit