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./src/styles/main.scss (./node_modules/css-loader/dist/cjs.js!./node_modules/sass-loader/lib/loader.js!./src/styles/main.scss)
Module build failed (from ./node_modules/sass-loader/lib/loader.js):
Error: Cannot find module 'node-sass'

Not sure what you need to debug?
I'm using node v12.20 (I figured it might work with a lower version of node?) I have all the branches, in fact, I had to do an npm install node-sass -D to get one other branch to work. Here's what the terminal shows after npm start
ERROR in ./src/wireframe/wireframes.scss (./node_modules/css-loader/dist/cjs.js!./node_modules/sass-loader/lib/loader.js!./src/wireframe/wireframes.scss)
Module build failed (from ./node_modules/sass-loader/lib/loader.js):
Error: Cannot find module 'node-sass'
Require stack:

• /Users/tony/Documents/Development/ReactTraining/react-router-5-course/node_modules/sass-loader/lib/loader.js
• /Users/tony/Documents/Development/ReactTraining/react-router-5-course/node_modules/loader-runner/lib/loadLoader.js
• /Users/tony/Documents/Development/ReactTraining/react-router-5-course/node_modules/loader-runner/lib/LoaderRunner.js
• /Users/tony/Documents/Development/ReactTraining/react-router-5-course/node_modules/webpack/lib/NormalModule.js
• /Users/tony/Documents/Development/ReactTraining/react-router-5-course/node_modules/webpack/lib/NormalModuleFactory.js
• /Users/tony/Documents/Development/ReactTraining/react-router-5-course/node_modules/webpack/lib/Compiler.js
• /Users/tony/Documents/Development/ReactTraining/react-router-5-course/node_modules/webpack/lib/webpack.js
• /Users/tony/Documents/Development/ReactTraining/react-router-5-course/node_modules/webpack-dev-server/bin/webpack-dev-server.js
  at Function.Module._resolveFilename (internal/modules/cjs/loader.js:815:15)
  at Function.Module._load (internal/modules/cjs/loader.js:667:27)
  at Module.require (internal/modules/cjs/loader.js:887:19)
  at require (internal/modules/cjs/helpers.js:74:18)
  at Object.sassLoader (/Users/tony/Documents/Development/ReactTraining/react-router-5-course/node_modules/sass-loader/lib/loader.js:46:72)
  @ ./src/wireframe/wireframes.scss 2:14-131
  @ ./src/wireframe/App.js
  @ ./src/index.js
  @ multi (webpack)-dev-server/client?http://localhost:8000 ./config/setup.js ./src/index.js
  ℹ ｢wdm｣: Failed to compile.

Hi,

I wanted to try your course but faced a compilation error when doing npm install. Here is the error log:

Dans le fichier inclus depuis /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/include/g++-v9/cassert:44,
                 depuis /home/stephane/.node-gyp/12.13.0/include/node/node_object_wrap.h:26,
                 depuis ../../nan/nan.h:55,
                 depuis ../src/binding.cpp:1:
../../nan/nan_object_wrap.h: Dans le destructeur « virtual Nan::ObjectWrap::~ObjectWrap() »:
../../nan/nan_object_wrap.h:24:25: erreur: « class Nan::Persistent<v8::Object> » n'a pas de membre nommé « IsNearDeath »
   24 |     assert(persistent().IsNearDeath());
      |                         ^~~~~~~~~~~
../../nan/nan_object_wrap.h: Dans la fonction membre statique « static void Nan::ObjectWrap::WeakCallback(const v8::WeakCallbackInfo<Nan::ObjectWrap>&) »:
../../nan/nan_object_wrap.h:127:26: erreur: « class Nan::Persistent<v8::Object> » n'a pas de membre nommé « IsNearDeath »
  127 |     assert(wrap->handle_.IsNearDeath());
      |                          ^~~~~~~~~~~

Do you have an idea of what the problem is?