apparently this error seems to be a conflict between @types/jest and typescript versions, and can be solved by updating both with jest v26.0.4 and typescript above v3.8 (v3.9.6 currently).
sry for the bother
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apparently this error seems to be a conflict between @types/jest and typescript versions, and can be solved by updating both with jest v26.0.4 and typescript above v3.8 (v3.9.6 currently).
sry for the bother