How to compile multiple Typescript files into a single file?

To compile multiple TypeScript files into a single file, use the TypeScript compiler (tsc) with the --outFile or --out option. First, create an output file, then navigate to the directory containing your TypeScript files in a terminal window. Finally, run the tsc command followed by the --outFile or --out option and the name of the output file, followed by the names of the TypeScript files you want to compile, separated by spaces. For example, tsc --outFile app.js file1.ts file2.ts.