The announcement of TypeScript 3.8 says: TypeScript 3.8 supports ES2020 as an option for module and target.
Though I don't understand whether the previous versions support the same features. There is no such information on the official page dedicated to Compiler Options, the line for target lists all the targets without the breakdown I was searing for.
The only source I can rely on right now is TypeScript Playground:


However, I don't understand whether I can use "target: ES2020" with TS v3.7.4 or not.
No. You can run tsc --help and read its output:
Version 3.7.4
Syntax: tsc [options] [file...]
Examples: tsc hello.ts
tsc --outFile file.js file.ts
tsc @args.txt
tsc --build tsconfig.json
Options:
-h, --help Print this message.
-w, --watch Watch input files.
--pretty Stylize errors and messages using color and context (experimental).
--all Show all compiler options.
-v, --version Print the compiler's version.
--init Initializes a TypeScript project and creates a tsconfig.json file.
-p FILE OR DIRECTORY, --project FILE OR DIRECTORY Compile the project given the path to its configuration file, or to a folder with a 'tsconfig.json'.
-b, --build Build one or more projects and their dependencies, if out of date
-t VERSION, --target VERSION Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'.
@RyanCavanaugh Thanks :)
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@RyanCavanaugh Thanks :)