Special Syntax for Defining Custom Record Keys in TypeScript

In the process of creating a small library, I am focused on enhancing type safety for the following object:

export const ErrorCodeMap: Record<string, [string, number]> = {
  NOT_FOUND: ['1001', 222],
  ALREADY_EXISTS: ['1002', 111],
}

My goal is to obtain a type-safe list of the keys within the object ErrorCodeMap.

Upon attempting the following:

export type ErrorCode = keyof typeof ErrorCodeMap;

I noticed that the type of ErrorCode is simply string, whereas I am aiming for it to be 'NOT_FOUND' | 'ALREADY_EXISTS'.

My attempts with the as const syntax have not yielded the desired outcome.

Is there a solution available that does not involve altering the Record<string, [string, number]> definition and thus preserving type safety in the object's structure?

typescripttype-conversionrecord

Answer №1

This method provides a suitable solution...

export const ERROR_MAP = {
  NOT_FOUND: ['1001', 222],
  ALREADY_EXISTS: ['1002', 111],
} as const satisfies Record<string, readonly [string, number]>

// move the cursor over to see the type ErrorCode = "NOT_FOUND" | "ALREADY_EXISTS"
type ErrorCode = keyof typeof ERROR_MAP;

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