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I am a C ++ programmer (not very good), and I know what enum is. When I was reading about lexical grammar (Source MDN), I saw a new keyword, enum. I tried it on NodeJS. And it works! (Well yes, but actually no ...).

enum someEnum { }

And NodeJS throws an error...

SyntaxError: Unexpected reserved word ←[90m at wrapSafe (internal/modules/cjs/loader.js:1060:16)←[39m ←[90m at Module._compile (internal/modules/cjs/loader.js:1108:27)←[39m ←[90m at Object.Module._extensions..js (internal/modules/cjs/loader.js:1164:10)←[39m ←[90m at Module.load (internal/modules/cjs/loader.js:993:32)←[39m ←[90m at Function.Module._load (internal/modules/cjs/loader.js:892:14)←[39m ←[90m at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)←[39m ←[90m at internal/main/run_main_module.js:17:47←[39m

But look! NodeJS considers it a keyword. The question is, is there a right way?

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    enum doesn't do anything currently. It's just a reserved keyword for the futuer. Commented Aug 3, 2020 at 4:03

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As said in the MDN source you linked, enum has been reserved for future use, but the functionality has not been implemented yet. You can either use the enum package, or use something like Typescript that does implement enums.

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If you notice, its section is Future Reserved Keywords, which

They have no special functionality at present, but they might at some future time, so they cannot be used as identifiers.

Currently, enum is supported in JS's superset, Typescript

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