redeclaring-global-properties.js

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// |reftest| skip-if(!xulRuntime.shell) -- needs evaluate

// Any copyright is dedicated to the Public Domain.

// http://creativecommons.org/licenses/publicdomain/

// Attempting to lexically redefine a var is a syntax error.

evaluate("var a;");

assertThrowsInstanceOf(() => evaluate("let a;"), SyntaxError);

// Attempting to lexically redefine a configurable global property that's not a

// var is okay.

this.b = 42;

assertEq(b, 42);

evaluate("let b = 17;");

assertEq(b, 17);

// Attempting to lexically redefine a var added by eval code is okay.

assertEq(typeof d, "undefined");

eval("var d = 33;");

assertEq(d, 33);

// Attempting to lexically redefine a var added by eval code, then deleted *as a

// name*, is okay.

assertEq(typeof e, "undefined");

eval("var e = 'ohia';");

assertEq(e, "ohia");

delete e;

assertEq(this.hasOwnProperty("e"), false);

evaluate("let e = 3.141592654;");

assertEq(e, 3.141592654);

// Attempting to lexically redefine a var added by eval code, then deleted *as a

// property*, is okay.

assertEq(typeof f, "undefined");

eval("var f = 8675309;");

assertEq(f, 8675309);

delete this.f;

assertEq(this.hasOwnProperty("f"), false);

if (typeof reportCompare === "function")

  reportCompare(true, true);

print("Tests complete");