throwOnCallConstructor.js

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// Count constructor calls

var cnt = 0;

class Base { constructor() { ++cnt; } }

// Force |JSFunction->hasScript()|

new Base();

assertEq(cnt, 1);

// Calling a ClassConstructor must throw

(function() {

    function f() { Base(); }

    try { f() } catch (e) {}

    try { f() } catch (e) {}

    assertEq(cnt, 1);

})();

// Spread-calling a ClassConstructor must throw

(function() {

    function f() { Base(...[]); }

    try { f() } catch (e) {}

    try { f() } catch (e) {}

    assertEq(cnt, 1);

})();

// Function.prototype.call must throw on ClassConstructor

(function() {

    function f() { Base.call(null); }

    try { f() } catch (e) {}

    try { f() } catch (e) {}

    assertEq(cnt, 1);

})();

// Function.prototype.apply must throw on ClassConstructor

(function() {

    function f() { Base.apply(null, []); }

    try { f() } catch (e) {}

    try { f() } catch (e) {}

    assertEq(cnt, 1);

})();

// Getter must throw if it is a ClassConstructor

(function() {

    var o = {};

    Object.defineProperty(o, "prop", { get: Base });

    function f() { o.prop };

    try { f() } catch (e) {}

    try { f() } catch (e) {}

    assertEq(cnt, 1);

})();

// Setter must throw if it is a ClassConstructor

(function() {

    var o = {};

    Object.defineProperty(o, "prop", { set: Base });

    function f() { o.prop = 1 };

    try { f() } catch (e) {}

    try { f() } catch (e) {}

    assertEq(cnt, 1);

})();

// Proxy apply must throw if it is a ClassConstructor

(function() {

    var o = new Proxy(function() { }, { apply: Base });

    function f() { o() };

    try { f() } catch (e) {}

    try { f() } catch (e) {}

    assertEq(cnt, 1);

})();

// Proxy get must throw if it is a ClassConstructor

(function() {

    var o = new Proxy({}, { get: Base });

    function f() { o.x }

    try { f() } catch (e) {}

    try { f() } catch (e) {}

    assertEq(cnt, 1);

})();