Failed at the angular-quickstart@1.0.0 start script 'tsc && concurrently "tsc -w" "lite-server" '

Tel est le message d'erreur qui m'a cueilli lorsque j'ai exécuté mon habituel "npm start" sur une application Angular 2 créée il y a quelques temps déjà à partir du starter kit proposé sur le site d'angular.io, alors que la veille au soir encore, tout marchait bien.

npm ERR! Windows_NT 10.0.14393  
npm ERR! argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Users\\sam\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js" "  
start"  
npm ERR! node v6.9.1  
npm ERR! npm  v3.10.9  
npm ERR! code ELIFECYCLE  
npm ERR! angular-quickstart@1.0.0 start: `tsc && concurrently "tsc -w" "lite-server" `  
npm ERR! Exit status 2  
npm ERR!  
npm ERR! Failed at the angular-quickstart@1.0.0 start script 'tsc && concurrently "tsc -w" "lite-server" '.  
npm ERR! Make sure you have the latest version of node.js and npm installed.  
npm ERR! If you do, this is most likely a problem with the angular-quickstart package,  
npm ERR! not with npm itself.  
npm ERR! Tell the author that this fails on your system:  
npm ERR!     tsc && concurrently "tsc -w" "lite-server"  
npm ERR! You can get information on how to open an issue for this project with:  
npm ERR!     npm bugs angular-quickstart  
npm ERR! Or if that isn't available, you can get their info via:  
npm ERR!     npm owner ls angular-quickstart  
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:  
npm ERR!     F:\draft\rando\npm-debug.log  

En bref :

KO

"start": "tsc && concurrently \"tsc -w\" \"lite-server\" ",  

La solution qui marché dans mon cas a consisté à remplacer, dans package.json, les commandes de démarrage du compilateur TypeScript et du serveur lite-server ci-dessus par :

OK

"start": "concurrently \"npm run tsc:w\" \"npm run lite\" "  

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