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f824911510
We want to hide `.message` from users, but the previous approach is not compatible with a specific [TS 3.7 flag](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-7.html#the-usedefineforclassfields-flag-and-the-declare-property-modifier) ("using class fields to specialize properties from base classes also won’t work"). I received a request from the TS team to fix this, so they can enable that flag. Instead, we just override `message` to `never` in the .d.ts using `declare`. PR Close #55160