由于未定义变量的 postcss 规则，编译 scss 文件的 NodeJs 脚本失败

Question

我正在使用 scss-bundle 导入一个 scss 文件并解析他的所有 @import 语句以便稍后再次将其保存为 scss 文件。

这很好用，下面是一个例子，看看它是如何工作的：

scss-bundle.ts

import { Bundler } from 'scss-bundle';
import { relative } from 'path';
import { writeFile } from 'fs-extra';

/** Bundles all SCSS files into a single file */
async function bundleScss(input, output) {
  const {found, bundledContent, imports} = await new Bundler()
    .Bundle(input, ['./src/styles/**/*.scss']);
  if (imports) {
    const cwd = process.cwd();

    const filesNotFound = imports
      .filter((x) => !x.found)
      .map((x) => relative(cwd, x.filePath));

    if (filesNotFound.length) {
      console.error(`SCSS imports failed \n\n${filesNotFound.join('\n - ')}\n`);
      throw new Error('One or more SCSS imports failed');
    }
  }

  if (found) {
    await writeFile(output, bundledContent);
  }
}

bundleScss('./src/styles/file-to-import.scss', './src/styles/imported-file.scss');

其中 file-to-import.scss 是以下文件:

@import './file-to-import-1';
@import './file-to-import-2';

和file-to-import-1.scss和file-to-import-2.scss是以下文件：

文件导入-1.scss

.price-range {
  background-color: $range-header-background-1;
}

文件导入-2.scss

.qr-code {
  background-color: $range-header-background-2;
}

脚本执行结果为：

进口-file.scss:

.price-range {
  background-color: $range-header-background-1;
}

.qr-code {
  background-color: $range-header-background-2;
}

在此之前一切正常。

现在 ... 我想使用 postcss-css-modules 来散列类的名称，结果应该是这样的：

被哈希后导入-file.scss

._3BQkZ {
  background-color: $range-header-background-1;
}

.Xb2EV {
  background-color: $range-header-background-2;
}

我已经做到了，但前提是我定义了变量 $range-header-background-1 和 $range-header-background-2。

但是，我还不能定义变量，因为我需要在运行时间将它们定义为 Http 请求的查询参数。

如果我运行脚本没有定义变量，则会显示以下错误：

(node:1972) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 2): CssSyntaxError: <css input>:372:14: Unknown word
(node:1972) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

这是 scss-budle.ts 与 postcss-css-modules 的调用：

import { Bundler } from 'scss-bundle';
import { relative } from 'path';
import * as path from 'path';
import { writeFile } from 'fs-extra';
import * as postcssModules from 'postcss-modules';
import * as postcss from 'postcss';
import * as fs from 'fs';

/** Bundles all SCSS files into a single file */
async function bundleScss(input, output) {
  const {found, bundledContent, imports} = await new Bundler()
    .Bundle(input, ['./src/styles/**/*.scss']);
  if (imports) {
    const cwd = process.cwd();

    const filesNotFound = imports
      .filter((x) => !x.found)
      .map((x) => relative(cwd, x.filePath));

    if (filesNotFound.length) {
      console.error(`SCSS imports failed \n\n${filesNotFound.join('\n - ')}\n`);
      throw new Error('One or more SCSS imports failed');
    }
  }

  if (found) {
    await writeFile(output, bundledContent);

    const hashedResult = await postcss().use(postcssModules({
      generateScopedName: '[hash:base64:5]',
      getJSON(cssFileName: any, json: any, outputFileName: any) {
        let jsonFileName = path.resolve('./src/styles/imported-file.json');
        fs.writeFileSync(jsonFileName, JSON.stringify(json));
      }
    })).process(bundledContent);
    await writeFile(output.replace('.scss', '-hashed.scss'), hashedResult.css, 'utf8');
    return;
  }

}

bundleScss('./src/styles/file-to-import.scss', './src/styles/imported-file.scss');

有人知道如何继续执行 postcss-css-modules 而不会因为未定义 scss 变量而停止吗？

提前致谢。

Answer 1

我能够运行脚本成功使用postcss-scss as parser of postcss:

import * as postcssScss from 'postcss-scss';

...

const hashedResult = await postcss([
  postcssModules({
    generateScopedName: '[hash:base64:8]',
    getJSON(cssFileName: any, json: any, outputFileName: any) {
        let jsonFileName = path.resolve('./src/styles/imported-file.json');
        fs.writeFileSync(jsonFileName, JSON.stringify(json));
    }
  })
]).process(bundledContent, { parser: postcssScss});

下面，我留下完整的脚本：

scss-bundle.ts

import { Bundler } from 'scss-bundle';
import { relative } from 'path';
import * as path from 'path';
import { writeFile } from 'fs-extra';
import * as postcssModules from 'postcss-modules';
import * as postcss from 'postcss';
import * as fs from 'fs';
import * as postcssScss from 'postcss-scss';

/** Bundles all SCSS files into a single file */
async function bundleScss(input, output) {
  const {found, bundledContent, imports} = await new Bundler()
    .Bundle(input, ['./src/styles/**/*.scss']);
  if (imports) {
    const cwd = process.cwd();

    const filesNotFound = imports
      .filter((x) => !x.found)
      .map((x) => relative(cwd, x.filePath));

    if (filesNotFound.length) {
      console.error(`SCSS imports failed \n\n${filesNotFound.join('\n - ')}\n`);
      throw new Error('One or more SCSS imports failed');
    }
  }

  if (found) {
    await writeFile(output, bundledContent);

    const hashedResult = await postcss([
      postcssModules({
        generateScopedName: '[hash:base64:8]',
        getJSON(cssFileName: any, json: any, outputFileName: any) {
            let jsonFileName = path.resolve('./src/styles/imported-file.json');
            fs.writeFileSync(jsonFileName, JSON.stringify(json));
        }
      })
    ]).process(bundledContent, { parser: postcssScss});
    await writeFile(output.replace('.scss', '-hashed.scss'), hashedResult.css, 'utf8');
    return;
  }
}

bundleScss('./src/styles/file-to-import.scss', './src/styles/imported-file.scss');

由于未定义变量的 postcss 规则，编译 scss 文件的 NodeJs 脚本失败

NodeJs Script that compiles scss files fails because of postcss rule for undefined variables

sass

node.js

postcss