Disallows the implicit fallthrough of case statements Case statements without a `break` will execute their body and then fallthrough to the next case or default block and execute this block as well. While this is sometimes intentional, many times the developer has forgotten to add a break statement, intending only for a single case statement to be executed. This rule enforces that you either end each case statement with a break statement or an explicit comment that fallthrough was intentional. The fallthrough comment must contain one of `fallthrough`, `falls through` or `fall through`. ### Invalid: ```typescript switch (myVar) { case 1: console.log("1"); case 2: console.log("2"); } // If myVar = 1, outputs both `1` and `2`. Was this intentional? ``` ### Valid: ```typescript switch (myVar) { case 1: console.log("1"); break; case 2: console.log("2"); break; } // If myVar = 1, outputs only `1` switch (myVar) { case 1: console.log("1"); /* falls through */ case 2: console.log("2"); } // If myVar = 1, intentionally outputs both `1` and `2` ```