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LibJS: Disallow duplicated variable declarations
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parent
5cc518f07a
commit
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4 changed files with 62 additions and 4 deletions
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@ -6,9 +6,9 @@ describe("[[SetPrototypeOf]] trap normal behavior", () => {
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let p = new Proxy(o, { setPrototypeOf: null });
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expect(Object.setPrototypeOf(p, proto)).toBe(p);
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let p = new Proxy(o, { setPrototypeOf: undefined });
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p = new Proxy(o, { setPrototypeOf: undefined });
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expect(Object.setPrototypeOf(p, proto)).toBe(p);
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let p = new Proxy(o, {});
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p = new Proxy(o, {});
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expect(Object.setPrototypeOf(p, proto)).toBe(p);
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});
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@ -0,0 +1,30 @@
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describe("duplicated variable declarations should throw", () => {
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test("given two declarations in the same statement", () => {
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expect("let a, a;").not.toEval();
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expect("const a, a;").not.toEval();
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expect("var a, a;").toEval();
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});
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test("fail to parse if repeated over multiple statements", () => {
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expect("let a; var a;").not.toEval();
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expect("let b, a; var c, a;").not.toEval();
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expect("const a; var a;").not.toEval();
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expect("const b, a; var c, a;").not.toEval();
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});
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test.skip("should fail to parse even if variable first declared with var", () => {
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expect.skip("var a; let a;").toEval();
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expect.skip("var a; let b, a;").toEval();
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expect.skip("var a; const a;").toEval();
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expect.skip("var a; const b, a;").toEval();
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});
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test.skip("special cases with for loops", () => {
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expect("for (var a;;) { let a; }").toEval();
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expect("for (let a;;) { let a; }").toEval();
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expect("for (var a;;) { var a; }").toEval();
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expect("for (let a;;) { var a; }").not.toEval();
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});
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});
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@ -15,12 +15,12 @@ test("basic functionality", () => {
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});
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test("casts |this| to string", () => {
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const it = String.prototype[Symbol.iterator].call(45);
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let it = String.prototype[Symbol.iterator].call(45);
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expect(it.next()).toEqual({ value: "4", done: false });
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expect(it.next()).toEqual({ value: "5", done: false });
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expect(it.next()).toEqual({ value: undefined, done: true });
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const it = String.prototype[Symbol.iterator].call(false);
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it = String.prototype[Symbol.iterator].call(false);
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expect(it.next()).toEqual({ value: "f", done: false });
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expect(it.next()).toEqual({ value: "a", done: false });
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expect(it.next()).toEqual({ value: "l", done: false });
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