ParseError:需要冒号(svelte with scss style) svelte单元测试

Question

我正在尝试为使用SCSS作为默认样式的组件编写测试。但是测试抛出的错误是它不能理解SCSS

myComponent.svelte

<div>Hello <span>world</span></div>
<style>
div {
 padding: 20px;
 span {
  font-weight: bold;
 }
}
</style>

测试文件

// mycomponent.test.js
import { render } from '@testing-library/svelte';
import MyComponent from './MyComponent.svelte';
...
const { component } = render(MyComponent, {});
...

Jest配置

module.exports = {
  transform: {
    '^.+\\.js$': 'babel-jest',
    '^.+\\.svelte$': ['svelte-jester', { preprocess: true, debug: true }],
  },
  moduleFileExtensions: ['js', 'svelte'],
  roots: ['<rootDir>/app/modules'],
  modulePaths: ['<rootDir>/app/modules'],
  moduleDirectories: ['node_modules', 'app/modules'],
  setupFilesAfterEnv: [
    '<rootDir>/app/modules/tests/setupTest.js',
    '@testing-library/jest-dom/extend-expect',
  ],
  clearMocks: true, // Automatically clear mock calls and instances before every test.
};

我在svelte配置中将默认样式设置为SCSS

svelte.config.js

const preprocess = require('svelte-preprocess');

module.exports = {
  preprocess: preprocess({ defaults: { style: 'scss' } }),
};

错误堆栈

Colon is expected
4:     padding: 20px;
5: 
6:     span {
              ^
7:       font-weight: bold;
8:     }
ParseError: Colon is expected

      at error (node_modules/svelte/src/compiler/utils/error.ts:25:16)
      at Parser$1.error (node_modules/svelte/src/compiler/parse/index.ts:101:3)
      at Object.read_style [as read] (node_modules/svelte/src/compiler/parse/read/style.ts:31:11)
      at tag (node_modules/svelte/src/compiler/parse/state/tag.ts:189:27)
      at new Parser$1 (node_modules/svelte/src/compiler/parse/index.ts:53:12)
      at parse (node_modules/svelte/src/compiler/parse/index.ts:218:17)
      at Object.compile (node_modules/svelte/src/compiler/compile/index.ts:93:14)
      at compiler (node_modules/svelte-jester/dist/transformer.cjs:135:32)
      at Object.processSync [as process] (node_modules/svelte-jester/dist/transformer.cjs:111:12)
      at ScriptTransformer.transformSource (node_modules/@jest/transform/build/ScriptTransformer.js:464:35)

要复制克隆并运行此存储库https://github.com/rparsh/svelte-testing-scss，请执行以下操作

Answer 1

将lang="scss"添加到<style>标记：

<style lang="scss">
</style>

一般来说，不再推荐使用默认语言，因为这样的问题。您不能确保生态系统中的所有工具都支持读取默认值。这也是为什么这个设置被从文档中删除，svelte-preprocess现在会打印一个警告，告诉你不应该再使用它。