tsc is not recognized as internal or external command

There might be a reason that Typescript is not installed globally, so install it

npm install -g typescript // installs typescript globally

If you want to convert .ts files into .js, do this as per your need

tsc path/file.ts // file.ts will be converted to file.js
tsc              // all .ts files will be converted to .js files with in the directory
tsc --watch      // converts all .ts files to .js, and watch changes in .ts files

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