scss全局引入-env变量

sass-loader < 7.x

build: {
    loaders: {
      scss: {
        data: `
          $theme_body_color:${process.env.THEME_BODY_COLOR};
          $theme_main_color:${process.env.THEME_MAIN_COLOR};
        `
      }
    },
  }

sass-loader 8.x

build: {
    loaders: {
      scss: {
        prependData: `
          $theme_body_color:${process.env.THEME_BODY_COLOR};
          $theme_main_color:${process.env.THEME_MAIN_COLOR};
        `
      }
    },
  }

sass-loader > 9.x

build: {
    loaders: {
      scss: {
        additionalData: `
          $theme_body_color:${process.env.THEME_BODY_COLOR};
          $theme_main_color:${process.env.THEME_MAIN_COLOR};
        `
      }
    },
  }