a sample code of how to use const as const instead of enums in TypeScript

ts-use_consts_instead_of_enums.ts

/*
    from:

    Enums considered harmful | Matt Pocock
    https://www.youtube.com/watch?v=jjMbPt_H3RQ
*/

const LogLevel = {
  DEBUG: "DEBUG",
  INFO: "INFO",
  WARNING: "WARNING",
  ERROR: "ERROR"
} as const;

type TLogLevelKeys = keyof typeof LogLevel;
type TLogLevel = typeof LogLevel[TLogLevelKeys];

const log = (message: string, level: TLogLevel = LogLevel.DEBUG) => console.log(`${LogLevel[level]}: ${message}`);

log("DEBUG value from const", LogLevel.DEBUG);

//---------------------------------------------//

enum ELogLevel {
  DEBUG = "DEBUG",
  INFO = "INFO",
  WARNING = "WARNING",
  ERROR = "ERROR"
}

console.log("DEBUG value from enum", ELogLevel.DEBUG);

Sandro Maglione on X: "Typescript wizardy: as const + satisfies Combine both to have type safety on Record keys and values + constant inferred types You can then extract both keys and values as unions using keyof and typeof 🧙 https://t.co/cUH05nNXl2" / X

Sandro Maglione on X: "satisfies makes everything type safe in typescript Combine it with union types and template literals to stop worrying about typos ever again 🥳 https://t.co/n2FBALhlzv" / X