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The term 'ts-node' is not recognized

I am following a tutorial and the guy uses ts-node, so I did the same and installed it through yarn but it showed this error

 ts-node : The term 'ts-node' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the    
name, or if a path was included, verify that the path is correct and try again.
At line:1 char:1
+ ts-node .\deploy.ts
+ ~~~~~~~
    + CategoryInfo          : ObjectNotFound: (ts-node:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

so I searched a bit and tried to add it globally but it still shows the same error, can you guys help me find out what the issue is, as I want to learn the basics of TypeScript for a quiz tomorrow.

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