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feat(typescript-estree): disallow switch statements with multiple default cases #8411

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merged 4 commits into from Mar 16, 2024
Merged

feat(typescript-estree): disallow switch statements with multiple default cases #8411

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362dca8
feat: disallow switch statements with multiple default cases
DMartens Feb 8, 2024
185b04e
fix: add missing snapshots for new error fixture
DMartens Feb 8, 2024
10a7b46
Update fixture.ts to add a ending newline
bradzacher Mar 16, 2024
7dabbce
Update 1-TSESTree-Error.shot
bradzacher Mar 16, 2024
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3 changes: 3 additions & 0 deletions ...ast-spec/src/statement/SwitchStatement/fixtures/_error_/multiple-default-cases/fixture.ts
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@@ -0,0 +1,3 @@
switch (true) {
default: default:
}
12 changes: 12 additions & 0 deletions ...t/SwitchStatement/fixtures/_error_/multiple-default-cases/snapshots/1-TSESTree-Error.shot
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3 changes: 3 additions & 0 deletions ...ment/SwitchStatement/fixtures/_error_/multiple-default-cases/snapshots/2-Babel-Error.shot
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3 changes: 3 additions & 0 deletions .../SwitchStatement/fixtures/_error_/multiple-default-cases/snapshots/3-Alignment-Error.shot
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11 changes: 11 additions & 0 deletions packages/typescript-estree/src/convert.ts
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Expand Up @@ -844,6 +844,17 @@ export class Converter {
});

case SyntaxKind.SwitchStatement:
if (
node.caseBlock.clauses.filter(
switchCase => switchCase.kind === SyntaxKind.DefaultClause,
).length > 1
) {
this.#throwError(
node,
"A 'default' clause cannot appear more than once in a 'switch' statement.",
);
}

return this.createNode<TSESTree.SwitchStatement>(node, {
type: AST_NODE_TYPES.SwitchStatement,
discriminant: this.convertChild(node.expression),
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