What code were you trying to parse?

[1].forEach(value=>value+1);

What did you expect to happen?

No warnings

What actually happened?

A warning from@typescript-eslint/restrict-plus-operands rule.

After a bit of debugging I found out that type checker returnedany type for thevalue node. It happened becauseproject didn't contain a reference to package's tsconfig file, so this file was linted in a context of an inferred project.

I've tried to reproduce it in an isolated environment and looks like it works correctly if there is only one project.

UPD: After reading source it makes sense that it can't do the same thing it does with a single config, but falling back to the same program used for non-type-checked rules should also make rules handle it like it does without any project specified - throw an error.

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