JS: add query js/unused-property

javascript/ql/test/query-tests/Declarations/UnusedProperty/UnusedProperty.expected

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+| tst.js:4:9:4:19 | unused1: 42 | Unused property unused1. |
+| tst.js:19:5:19:15 | unused9: 42 | Unused property unused9. |
+| tst.js:26:13:26:24 | unused11: 42 | Unused property unused11. |
+| tst.js:31:13:31:35 | used12_ ... lly: 42 | Unused property used12_butNotReally. |
+| tst.js:32:13:32:24 | unused12: 42 | Unused property unused12. |
+| tst.js:52:3:52:14 | unused14: 42 | Unused property unused14. |
+| tst.js:54:2:54:20 | captured14.unused14 | Unused property unused14. |
+| tst.js:55:2:55:20 | captured14.unused14 | Unused property unused14. |
+| tst.ts:24:21:24:25 | p: 42 | Unused property p. |

javascript/ql/test/query-tests/Declarations/UnusedProperty/UnusedProperty.qlref

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+Declarations/UnusedProperty.ql

javascript/ql/test/query-tests/Declarations/UnusedProperty/tst.js

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+(function(){
+    var captured1 = {
+        used1: 42,
+        unused1: 42
+    };
+    captured1.used1;
+
+    var unused2 = {
+        unused2a: 42,
+        unused2b: 42
+    };
+
+    for (x.p in { used3: 42 });
+    for (x.p of { used4: 42 });
+    42 in { used5: 42 };
+    f(...{used6: 42});
+    [...{used7: 42}];
+	({...{used8: 42}});
+	({ unused9: 42 }) + "";
+    ({ used10: 42 }).hasOwnProperty;
+    ({ used10: 42 }).propertyIsEnumerable;
+
+    (function(){
+        var captured11 = {
+            used11: 42,
+            unused11: 42
+        };
+        captured11.used11;
+
+        var captured12 = {
+            used12_butNotReally: 42,
+            unused12: 42
+        };
+
+        throw x;
+
+        captured12.used12_butNotReally;
+
+        var captured13 = {
+            used13: 42,
+            unused13: 42
+        };
+        captured13.used13;
+    });
+    (function(options){
+        if(unknown)
+            options = {};
+        options.output = 42;
+    });
+
+	var captured14 = {
+		unused14: 42
+	};
+	captured14.unused14 = 42;
+	captured14.unused14 = 42;
+
+
+	var captured15 = {
+		semiUnused15: 42
+	};
+	captured15.semiUnused15 = 42;
+	captured15.semiUnused15;
+});
+(function(unusedParam = {unusedProp: 42}){
+
+});
+(function(){
+	var unusedObj = {
+		unusedProp: 42
+	};
+});
+(function(){
+	var unusedSpecials = {
+		toString: function(){},
+		valueOf: function(){},
+		'@@iterator': function(){}
+	};
+	unusedSpecials.foo;
+});
+
+(function(){
+	({ unusedProp: 42 }, 42);
+});

javascript/ql/test/query-tests/Declarations/UnusedProperty/tst.ts

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+(function(){
+    var o1: { p: int, q: int } = { p: 42, q: 42 };
+    o1.q;
+
+    var o2 = <{ p: int, q: int }>{ p: 42, q: 42 };
+    o2.q;
+
+    var o3: { p: int, q: int } = f();
+    o3 = o3 || { p: 42, q: 42 };
+    o3.q;
+
+});
+
+class C {
+    private o: { p: int, q: int };
+
+    constructor() {
+        this.o = { p: 42, q: 42 };
+        this.o.q;
+    }
+}
+
+(function(){
+    var o1: any = { p: 42, q: 42 };
+    o1.q;
+    var o2: any = { p: 42, q: 42 };
+    var o3: { p: int, q: int } = o2;
+})