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StripEnums drops types for key-optional fields #252

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#253
Open
StripEnums drops types for key-optional fields#252
#253
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bugSomething isn't working
@Eazash

Description

@Eazash
Eazash
opened on Sep 8, 2025

Environment

Reproduction

https://www.typescriptlang.org/play/?#code/C4TwDgpgBAysBOBLMBRAdgVwLYGcA8AKlBAB7ARoAmOUAShAMYD28leOCiaA5gDRQBDNCAB8IqAF4oAbwBQUBVADaAaShcoAawggmAMygEAugC5Dqo8TIVqUAEZMmAGwhD5igPzmVR9wrMEFlbkVDQcSDx+UF6BPlEBQaQhtkx2AFaMwFExFvHelkk2NACC8PACIHhCotn5ebEF1qFQGFQQelwQlLWtlO2d3YpQZtUA3LIAvuOyFNhQAFoy7nqOvO52AvBQk7KyoJBQABqSS0MCHmYOzq5oUXYXCzt74NAAmidwSKiYuHiHIkA

Describe the bug

When used on records with optional types (e.g. CompilerOptions), the StripEnums type utility drops those types and reverts to an any. This leads to compilerOptions being typed as below

(property) TSConfig.compilerOptions?: {
    [x: string]: any;
    allowImportingTsExtensions?: any;
    allowJs?: any;
    allowArbitraryExtensions?: any;
    allowSyntheticDefaultImports?: any;
    ... 104 more ...;
    useDefineForClassFields?: any;
} | undefined

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