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LibJS: Disallow duplicated variable declarations

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davidot 2021-07-12 01:29:47 +02:00 • committed by Andreas Kling
parent 5cc518f07a
commit 40b8689f9b
4 changed files with 62 additions and 4 deletions
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30
Userland/Libraries/LibJS/Tests/duplicated-variable-declarations.js Normal file
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describe("duplicated variable declarations should throw", () => {
test("given two declarations in the same statement", () => {
expect("let a, a;").not.toEval();
expect("const a, a;").not.toEval();
expect("var a, a;").toEval();
});
test("fail to parse if repeated over multiple statements", () => {
expect("let a; var a;").not.toEval();
expect("let b, a; var c, a;").not.toEval();
expect("const a; var a;").not.toEval();
expect("const b, a; var c, a;").not.toEval();
});
test.skip("should fail to parse even if variable first declared with var", () => {
expect.skip("var a; let a;").toEval();
expect.skip("var a; let b, a;").toEval();
expect.skip("var a; const a;").toEval();
expect.skip("var a; const b, a;").toEval();
});
test.skip("special cases with for loops", () => {
expect("for (var a;;) { let a; }").toEval();
expect("for (let a;;) { let a; }").toEval();
expect("for (var a;;) { var a; }").toEval();
expect("for (let a;;) { var a; }").not.toEval();
});
});