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("Hello World", LogLevel.DEBUG);

code at the typescript playground