Added check for modifiersType existing in a mapped type #136
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Fixes typescript-eslint/typescript-eslint#3405
The issue is that
modifiersType
doesn't necessarily exist in TypeScript's internalMappedType
:https://github.com/microsoft/TypeScript/blob/5fde87135f25a2dbea8a98e05438e61fdad06fe6/src/compiler/types.ts#L5431
Co-authored-by: @kirjs