derived-lookup-map

a constant that merely uses the union kept in the `const` object's file

Agent checkadvisory by defaultbasecode

The argument

Derived Lookup Maps May Co-Locate

A lookup map keyed by the union (Record<Action, …>) may live in the same file as the const object — the two are tautologically coupled, so every change to one changes the other.

export const LogLevel = {
	Debug: 'debug',
	Info: 'info',
	Error: 'error',
} as const;

export type LogLevel = (typeof LogLevel)[keyof typeof LogLevel];

export const logLevelLabels: Record<LogLevel, string> = {
	[LogLevel.Debug]: 'Debug',
	[LogLevel.Info]: 'Info',
	[LogLevel.Error]: 'Error',
};

An unrelated constant that merely uses the union goes in constants/ as usual.

The proof

failsrc/common/constants/LogLevel.ts

export const LogLevel = {
	Debug: 'debug',
	Info: 'info',
	Error: 'error',
} as const;

export type LogLevel = (typeof LogLevel)[keyof typeof LogLevel];

// Not keyed by the union — it merely uses it, so it is an unrelated constant
// riding along in this file instead of living in `constants/` on its own.
export const defaultLogLevel: LogLevel = LogLevel.Info;

passsrc/common/constants/LogLevel.ts

export const LogLevel = {
	Debug: 'debug',
	Info: 'info',
	Error: 'error',
} as const;

export type LogLevel = (typeof LogLevel)[keyof typeof LogLevel];

// Keyed by the union, so the two are tautologically coupled: every change to
// one is a change to the other.
export const logLevelLabels: Record<LogLevel, string> = {
	[LogLevel.Debug]: 'Debug',
	[LogLevel.Info]: 'Info',
	[LogLevel.Error]: 'Error',
};

Turn it down

Both lines go in your lightsout.config.json.

"standards-checks": { "derived-lookup-map": "advisory" }

"standards-checks": { "derived-lookup-map": "off" }