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LibJS: Make typeof return undefined for undefined variables
This makes `typeof i_dont_exist` return `undefined` instead of throwing an error.
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2 changed files with 32 additions and 3 deletions
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@ -8,6 +8,19 @@ try {
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assert(typeof null === "object");
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assert(typeof undefined === "undefined");
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var iExist = 1;
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assert(typeof iExist === "number");
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assert(typeof iDontExist === "undefined");
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var calls = 0;
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Object.defineProperty(globalThis, "foo", {
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get() {
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calls++;
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},
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});
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assert(typeof foo === "undefined");
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assert(calls === 1);
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console.log("PASS");
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} catch (e) {
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console.log("FAIL: " + e);
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