错误：命名空间“std”中没有名为“remove_cv_t”的模板；你是说“remove_cv”吗？

Question

我的问题似乎与这个问题类似，只不过是在rails应用程序中运行Yarn Install时发生的。

当我运行纱线安装时，它成功运行了一段时间，然后

../src/libsass/src/ast.hpp:1614:25: warning: loop variable 'numerator' of type 'const std::__1::basic_string<char>' creates a copy from type 'const std::__1::basic_string<char>' [-Wrange-loop-analysis]
        for (const auto numerator : numerators)
                        ^
../src/libsass/src/ast.hpp:1614:14: note: use reference type 'const std::__1::basic_string<char> &' to prevent copying
        for (const auto numerator : numerators)
             ^~~~~~~~~~~~~~~~~~~~~~
                        &
../src/libsass/src/ast.hpp:1616:25: warning: loop variable 'denominator' of type 'const std::__1::basic_string<char>' creates a copy from type 'const std::__1::basic_string<char>' [-Wrange-loop-analysis]
        for (const auto denominator : denominators)
                        ^
../src/libsass/src/ast.hpp:1616:14: note: use reference type 'const std::__1::basic_string<char> &' to prevent copying
        for (const auto denominator : denominators)
             ^~~~~~~~~~~~~~~~~~~~~~~~
                        &
2 warnings generated.
  rm -f Release/sass.a && ./gyp-mac-tool filter-libtool libtool  -static -o Release/sass.a Release/obj.target/libsass/src/libsass/src/ast.o Release/obj.target/libsass/src/libsass/src/ast_fwd_decl.o Release/obj.target/libsass/src/libsass/src/backtrace.o Release/obj.target/libsass/src/libsass/src/base64vlq.o Release/obj.target/libsass/src/libsass/src/bind.o Release/obj.target/libsass/src/libsass/src/cencode.o Release/obj.target/libsass/src/libsass/src/check_nesting.o Release/obj.target/libsass/src/libsass/src/color_maps.o Release/obj.target/libsass/src/libsass/src/constants.o Release/obj.target/libsass/src/libsass/src/context.o Release/obj.target/libsass/src/libsass/src/cssize.o Release/obj.target/libsass/src/libsass/src/emitter.o Release/obj.target/libsass/src/libsass/src/environment.o Release/obj.target/libsass/src/libsass/src/error_handling.o Release/obj.target/libsass/src/libsass/src/eval.o Release/obj.target/libsass/src/libsass/src/expand.o Release/obj.target/libsass/src/libsass/src/extend.o Release/obj.target/libsass/src/libsass/src/file.o Release/obj.target/libsass/src/libsass/src/functions.o Release/obj.target/libsass/src/libsass/src/inspect.o Release/obj.target/libsass/src/libsass/src/json.o Release/obj.target/libsass/src/libsass/src/lexer.o Release/obj.target/libsass/src/libsass/src/listize.o Release/obj.target/libsass/src/libsass/src/memory/SharedPtr.o Release/obj.target/libsass/src/libsass/src/node.o Release/obj.target/libsass/src/libsass/src/operators.o Release/obj.target/libsass/src/libsass/src/output.o Release/obj.target/libsass/src/libsass/src/parser.o Release/obj.target/libsass/src/libsass/src/plugins.o Release/obj.target/libsass/src/libsass/src/position.o Release/obj.target/libsass/src/libsass/src/prelexer.o Release/obj.target/libsass/src/libsass/src/remove_placeholders.o Release/obj.target/libsass/src/libsass/src/sass.o Release/obj.target/libsass/src/libsass/src/sass2scss.o Release/obj.target/libsass/src/libsass/src/sass_context.o Release/obj.target/libsass/src/libsass/src/sass_functions.o Release/obj.target/libsass/src/libsass/src/sass_util.o Release/obj.target/libsass/src/libsass/src/sass_values.o Release/obj.target/libsass/src/libsass/src/source_map.o Release/obj.target/libsass/src/libsass/src/subset_map.o Release/obj.target/libsass/src/libsass/src/to_c.o Release/obj.target/libsass/src/libsass/src/to_value.o Release/obj.target/libsass/src/libsass/src/units.o Release/obj.target/libsass/src/libsass/src/utf8_string.o Release/obj.target/libsass/src/libsass/src/util.o Release/obj.target/libsass/src/libsass/src/values.o
  c++ '-DNODE_GYP_MODULE_NAME=binding' '-DUSING_UV_SHARED=1' '-DUSING_V8_SHARED=1' '-DV8_DEPRECATION_WARNINGS=1' '-DV8_DEPRECATION_WARNINGS' '-DV8_IMMINENT_DEPRECATION_WARNINGS' '-D_GLIBCXX_USE_CXX11_ABI=1' '-D_DARWIN_USE_64_BIT_INODE=1' '-D_LARGEFILE_SOURCE' '-D_FILE_OFFSET_BITS=64' '-DBUILDING_NODE_EXTENSION' -I/Users/st/.node-gyp/16.0.0/include/node -I/Users/st/.node-gyp/16.0.0/src -I/Users/st/.node-gyp/16.0.0/deps/openssl/config -I/Users/st/.node-gyp/16.0.0/deps/openssl/openssl/include -I/Users/st/.node-gyp/16.0.0/deps/uv/include -I/Users/st/.node-gyp/16.0.0/deps/zlib -I/Users/st/.node-gyp/16.0.0/deps/v8/include -I../../nan -I../src/libsass/include  -O3 -gdwarf-2 -mmacosx-version-min=10.7 -arch x86_64 -Wall -Wendif-labels -W -Wno-unused-parameter -std=c++11 -stdlib=libc++ -fno-rtti -fno-exceptions -fno-strict-aliasing -MMD -MF ./Release/.deps/Release/obj.target/binding/src/binding.o.d.raw   -c -o Release/obj.target/binding/src/binding.o ../src/binding.cpp
In file included from ../src/binding.cpp:1:
In file included from ../../nan/nan.h:56:
In file included from /Users/st/.node-gyp/16.0.0/include/node/node.h:63:
In file included from /Users/st/.node-gyp/16.0.0/include/node/v8.h:30:
/Users/st/.node-gyp/16.0.0/include/node/v8-internal.h:452:38: error: no template named 'remove_cv_t' in namespace 'std'; did you mean 'remove_cv'?
            !std::is_same<Data, std::remove_cv_t<T>>::value>::Perform(data);
                                ~~~~~^~~~~~~~~~~
                                     remove_cv
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/type_traits:697:50: note: 'remove_cv' declared here
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_cv
                                                 ^
1 error generated.
make: *** [Release/obj.target/binding/src/binding.o] Error 1
gyp ERR! build error 
gyp ERR! stack Error: `make` failed with exit code: 2
gyp ERR! stack     at ChildProcess.onExit (/Users/st/rails/myapp/node_modules/node-gyp/lib/build.js:262:23)
gyp ERR! stack     at ChildProcess.emit (node:events:365:28)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (node:internal/child_process:290:12)
gyp ERR! System Darwin 20.3.0
gyp ERR! command "/usr/local/Cellar/node/16.0.0/bin/node" "/Users/st/rails/myapp/node_modules/node-gyp/bin/node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
gyp ERR! cwd /Users/st/rails/myapp/node_modules/node-sass
gyp ERR! node -v v16.0.0
gyp ERR! node-gyp -v v3.8.0
gyp ERR! not ok 

有什么想法可以解决这个问题吗？（我甚至不确定这是否是Xcode/node/rails/C++的问题）

null

Xcode 12.4
Build version 12D4e

null

Apple clang version 12.0.0 (clang-1200.0.32.29)
Target: x86_64-apple-darwin20.3.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

请注意：我不是用cpp编码的，所以我对如何解决的上下文知识很少。

Answer 1

更新：自node-sass版本6.0.1以来，支持Node16。将node-sass更新到高于6.0.1的版本可以解决这个问题。

您看到的是在编译node-sass过程中出现的错误。这是一个处理SASS/SCSS样式的包，它是用C++编写的，并且只重新打包为JavaScript库。它是用C++编写的，这意味着在安装过程中需要在设备上编译它（这是由一个名为node-gyp的工具在内部完成的，您也可以在错误输出中找到它）。

问题是node-sass不支持Node16，在写这个答案的时候，请参见跟踪问题：https://github.com/sass/node-sass/issues/3077没有关于它何时支持它的估计（这是公平的，因为这是一个志愿者驱动的项目）。即使您设法在Node16上安装了node-sass，我也建议您不要安装node-sass，因为行为可能没有定义。