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WIP '@typescript-eslint/no-unnecessary-condition'#5620
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I'm not really sure why, but without this, TypeScript thinks that the state can only have the values that it sees in the initialization value. It also doesn't complain if setState is called with values that don't match the type it inferred for the state member. It needs to know that this.state can have other values than the initial value if we want to avoid false positives from '@typescript-eslint/no-unnecessary-condition'.
Without these, it thinks that all of the possible keys are present. Fixing this is needed if we want to avoid '@typescript-eslint/no-unnecessary-condition' complaining about our 'prop in obj' tests.
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There are type-aware lints we can enable to catch more typescript things. no-unnecessary-condition would catch unnecessary null checks but it's a fair amount of work to get passing. This is some WIP towards that.
I filed microsoft/TypeScript#62468 for the
newSelectedThreadIndexes.sizefalse positive.