noFallthroughSwitchClause
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Diagnostic Category: lint/suspicious/noFallthroughSwitchClause
Since: v1.0.0
Sources:
- Same as:
no-fallthrough
Disallow fallthrough of switch clauses.
Switch clauses in switch statements fall through by default.
This can lead to unexpected behavior when forgotten.
The rule doesn’t take
process.exit()in consideration.
Examples
Section titled ExamplesInvalid
Section titled Invalidswitch (bar) { case 0: a(); case 1: b();}code-block.js:2:2 lint/suspicious/noFallthroughSwitchClause ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
✖ This case is falling through to the next case.
1 │ switch (bar) {
> 2 │ case 0:
│ ^^^^^^^
> 3 │ a();
│ ^^^^
4 │ case 1:
5 │ b();
ℹ Add a break or return statement to the end of this case to prevent fallthrough.
Valid
Section titled Validswitch (foo) { case 1: case 2: doSomething(); break; case 3: { if (cond) { break; } else { break; } } case 4: doSomething();}