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Run npm install
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Run npm run tsc
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Install global pre-requisites npm install typescript live-server -g
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Run npm install
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Run npm run tsc to start the TypeScript compiler and watch for changes
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Run npm start in a separate terminal window to start the server and launch the app
After compiling the TypeScript code you can use a server (superstatic or live-server works great) to view the HTML files in the src folder.