Convert object values to enum-like type in TypeScript

Question

The type of ParsedParametersObject["--mode"] must be one of Parameters[ValidFirstCommandPhrases.buildProject].mode.values. Currently it has been hardcoded, so when new supported mode will be added to application we need to edit both Parameters[ValidFirstCommandPhrases.buildProject].mode.values and ParsedParametersObject.

How I can convert Parameters[ValidFirstCommandPhrases.buildProject].mode.values to valid enum-like type?

enum ValidFirstCommandPhrases { initializeProject = "initializeProject", buildProject = "buildProject" } export const Parameters = { [ValidFirstCommandPhrases.buildProject]: { mode: { name__includingDoubleNDash: "--mode", values: { development: "development", production: "production", } }, debug: { name__includingDoubleNDash: "--debug" } } } as const; type ParsedParametersObject = { // --mode [Parameters[ValidFirstCommandPhrases.buildProject].mode.name__includingDoubleNDash]: "development" | "production"; // Hardcoded!! }

nicolasrigaudiere · Accepted Answer · 2020-04-07 15:40:26Z

An option you can use is to have a dedicated ENVIRONMENTS enum and use it as a type in ParsedParametersObject["--mode"]'s type.

See below

enum ValidFirstCommandPhrases { initializeProject = "initializeProject", buildProject = "buildProject" } enum ENVIRONMENTS { DEVELOPMENT = 'development', PRODUCTION = 'production' } export const Parameters = { [ValidFirstCommandPhrases.buildProject]: { mode: { name__includingDoubleNDash: "--mode", values: { development: ENVIRONMENTS.DEVELOPMENT, production: ENVIRONMENTS.PRODUCTION, } }, debug: { name__includingDoubleNDash: "--debug" } } } as const; type ParsedParametersObject = { // --mode [Parameters[ValidFirstCommandPhrases.buildProject].mode.name__includingDoubleNDash]: ENVIRONMENTS; }

Hope it helps!

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