side_effects: true, unused: true, } input: { function f() { function f() {} function g() { return this; } f.g = g; return f.g(); } console.log(typeof f()); } expect: { function f() { function f() {} return f.g = function() { return this; }, f.g(); } console.log(typeof f()); } expect_stdout: "function" } issue_2110_2: { options = { collapse_vars: true, pure_getters: "strict", reduce_funcs: true, reduce_vars: true, unused: true, } input: { function f() { function f() {} function g() { return this; } f.g = g; return f.g(); } console.log(typeof f()); } expect: { function f() { function f() {} f.g = function() { return this; }; return f.g(); } console.log(typeof f()); } expect_stdout: "function" } issue_2110_3: { options = { collapse_vars: true, pure_getters: "strict", reduce_vars: true, } input: { function g() { return this; } console.log(typeof function() { function f() {} f.g = g; return f.g(); }()); } expect: { function g() { return this; } console.log(typeof function() { function f() {} f.g = g; return f.g(); }()); } expect_stdout: "function" } set_immutable_1: { options = { collapse_vars: true, evaluate: true, pure_getters: "strict", reduce_funcs: true, reduce_vars: true, toplevel: true, unused: true, } input: { var a = 1; a.foo += ""; if (a.foo) console.log("FAIL"); else console.log("PASS"); } expect: { 1..foo += ""; if (1..foo) console.log("FAIL"); else console.log("PASS"); } expect_stdout: "PASS" } set_immutable_2: { options = { collapse_vars: true, conditionals: true, pure_getters: "strict", reduce_funcs: true, reduce_vars: true, sequences: true, side_effects: true, toplevel: true, } input: { var a = 1; a.foo += ""; if (a.foo) console.log("FAIL"); else console.log("PASS"); } expect: { var a = 1; a.foo += "", a.foo ? console.log("FAIL") : console.log("PASS"); } expect_stdout: "PASS" } set_immutable_3: { options = { collapse_vars: true, evaluate: true, pure_getters: "strict", reduce_funcs: true, reduce_vars: true, toplevel: true, unused: true, } input: { "use strict"; var a = 1; a.foo += ""; if (a.foo) console.log("FAIL"); else console.log("PASS"); } expect: { "use strict"; 1..foo += ""; if (1..foo) console.log("FAIL"); else console.log("PASS"); } expect_stdout: true } set_immutable_4: { options = { collapse_vars: true, conditionals: true, pure_getters: "strict", reduce_funcs: true, reduce_vars: true, sequences: true, side_effects: true, toplevel: true, } input: { "use strict"; var a = 1; a.foo += ""; if (a.foo) console.log("FAIL"); else console.log("PASS"); } expect: { "use strict"; var a = 1; a.foo += "", a.foo ? console.log("FAIL") : console.log("PASS"); } expect_stdout: true } set_immutable_5: { options = { collapse_vars: true, conditionals: true, evaluate: true, pure_getters: "strict", reduce_funcs: true, reduce_vars: true, side_effects: true, toplevel: true, unused: true, } input: { "use strict"; var a = 1; a.foo += ""; if (a.foo) console.log("FAIL"); else console.log("PASS"); } expect: { "use strict"; 1..foo += ""; 1..foo ? console.log("FAIL") : console.log("PASS"); } expect_stdout: true } set_immutable_6: { options = { collapse_vars: true, conditionals: true, evaluate: true, pure_getters: "strict", reduce_funcs: true, reduce_vars: true, side_effects: true, toplevel: true, unused: true, } input: { var a = 1; a.foo += ""; if (a.foo) console.log("FAIL"); else console.log("PASS"); } expect: { 1..foo ? console.log("FAIL") : console.log("PASS"); } expect_stdout: true } set_mutable_1: { options = { collapse_vars: true, evaluate: true, pure_getters: "strict", reduce_funcs: true, reduce_vars: true, unused: true, } input: { !function a() { a.foo += ""; if (a.foo) console.log("PASS"); else console.log("FAIL"); }(); } expect: { !function a() { if (a.foo += "") console.log("PASS"); else console.log("FAIL"); }(); } expect_stdout: "PASS" } set_mutable_2: { options = { collapse_vars: true, conditionals: true, pure_getters: "strict", reduce_funcs: true, reduce_vars: true, sequences: true, side_effects: true, } input: { !function a() { a.foo += ""; if (a.foo) console.log("PASS"); else console.log("FAIL"); }(); } expect: { !function a() { (a.foo += "") ? console.log("PASS") : console.log("FAIL"); }(); } expect_stdout: "PASS" } issue_2313_1: { options = { collapse_vars: true, conditionals: true, pure_getters: "strict", sequences: true, side_effects: true, } input: { function x() { console.log(1); return { y: function() { console.log(2); return { z: 0 }; } }; } x().y().z++; if (x().y().z) { console.log(3); } } expect: { function x() { return console.log(1), { y: function() { return console.log(2), { z: 0 }; } }; } x().y().z++, x().y().z && console.log(3); } expect_stdout: [ "1", "2", "1", "2", ] } issue_2313_2: { options = { collapse_vars: true, conditionals: true, pure_getters: true, sequences: true, side_effects: true, } input: { function x() { console.log(1); return { y: function() { console.log(2); return { z: 0 }; } }; } x().y().z++; if (x().y().z) { console.log(3); } } expect: { function x() { return console.log(1), { y: function() { return console.log(2), { z: 0 }; } }; } x().y().z++, x().y().z && console.log(3); } expect_stdout: [ "1", "2", "1", "2", ] } issue_2313_3: { options = { collapse_vars: true, conditionals: true, pure_getters: "strict", } input: { function x() { console.log(1); return { y: function() { console.log(2); return { z: 0 }; } }; } x().y().z++; if (x().y().z) { console.log(3); } } expect: { function x() { console.log(1); return { y: function() { console.log(2); return { z: 0 }; } }; } x().y().z++; x().y().z && console.log(3); } expect_stdout: [ "1", "2", "1", "2", ] } issue_2313_4: { options = { collapse_vars: true, conditionals: true, pure_getters: true, } input: { function x() { console.log(1); return { y: function() { console.log(2); return { z: 0 }; } }; } x().y().z++; if (x().y().z) { console.log(3); } } expect: { function x() { console.log(1); return { y: function() { console.log(2); return { z: 0 }; } }; } x().y().z++; x().y().z && console.log(3); } expect_stdout: [ "1", "2", "1", "2", ] } issue_2313_5: { options = { pure_getters: "strict", side_effects: true, } input: { x().y++; x().y; } expect: { x().y++; x().y; } } issue_2313_6: { options = { pure_getters: true, side_effects: true, } input: { x().y++; x().y; } expect: { x().y++; x(); } } issue_2678: { options = { pure_getters: "strict", side_effects: true, } input: { var a = 1, c = "FAIL"; (function f() { (a-- && f()).p; return { get p() { c = "PASS"; } }; })(); console.log(c); } expect: { var a = 1, c = "FAIL"; (function f() { (a-- && f()).p; return { get p() { c = "PASS"; } }; })(); console.log(c); } expect_stdout: "PASS" } issue_2838: { options = { pure_getters: true, side_effects: true, } input: { function f(a, b) { (a || b).c = "PASS"; (function() { return f(a, b); }).prototype.foo = "bar"; } var o = {}; f(null, o); console.log(o.c); } expect: { function f(a, b) { (a || b).c = "PASS"; } var o = {}; f(null, o); console.log(o.c); } expect_stdout: "PASS" } issue_2938_1: { options = { pure_getters: true, unused: true, } input: { function f(a) { a.b = "PASS"; } var o = {}; f(o); console.log(o.b); } expect: { function f(a) { a.b = "PASS"; } var o = {}; f(o); console.log(o.b); } expect_stdout: "PASS" } issue_2938_2: { options = { pure_getters: true, toplevel: true, unused: true, } input: { var Parser = function Parser() {}; var p = Parser.prototype; p.initialContext = function initialContext() { console.log("PASS"); }; p.braceIsBlock = function() {}; (new Parser).initialContext(); } expect: { var Parser = function() {}; var p = Parser.prototype; p.initialContext = function() { console.log("PASS"); }; p.braceIsBlock = function() {}; (new Parser).initialContext(); } expect_stdout: "PASS" } issue_2938_3: { options = { pure_getters: true, side_effects: true, unused: true, } input: { function f(a) { var unused = a.a; a.b = "PASS"; a.c; } var o = {}; o.d; f(o); console.log(o.b); } expect: { function f(a) { a.b = "PASS"; } var o = {}; f(o); console.log(o.b); } expect_stdout: "PASS" } issue_2938_4: { options = { pure_getters: true, side_effects: true, toplevel: true, unused: true, } input: { var Parser = function Parser() {}; var p = Parser.prototype; var unused = p.x; p.initialContext = function initialContext() { p.y; console.log("PASS"); }; p.braceIsBlock = function() {}; (new Parser).initialContext(); } expect: { var Parser = function() {}; var p = Parser.prototype; p.initialContext = function() { console.log("PASS"); }; p.braceIsBlock = function() {}; (new Parser).initialContext(); } expect_stdout: "PASS" } collapse_vars_1_true: { options = { collapse_vars: true, pure_getters: true, unused: true, } input: { function f(a, b) { for (;;) { var c = a.g(); var d = b.p; if (c || d) break; } } } expect: { function f(a, b) { for (;;) if (a.g() || b.p) break; } } } collapse_vars_1_false: { options = { collapse_vars: true, pure_getters: false, unused: true, } input: { function f(a, b) { for (;;) { var c = a.g(); var d = b.p; if (c || d) break; } } } expect: { function f(a, b) { for (;;) { var c = a.g(); var d = b.p; if (c || d) break; } } } } collapse_vars_1_strict: { options = { collapse_vars: true, pure_getters: "strict", unused: true, } input: { function f(a, b) { for (;;) { var c = a.g(); var d = b.p; if (c || d) break; } } } expect: { function f(a, b) { for (;;) { var c = a.g(); var d = b.p; if (c || d) break; } } } } collapse_vars_2_true: { options = { collapse_vars: true, pure_getters: true, reduce_vars: true, } input: { function f() { function g() {} g.a = function() {}; g.b = g.a; return g; } } expect: { function f() { function g() {} g.b = g.a = function() {}; return g; } } } collapse_vars_2_false: { options = { collapse_vars: true, pure_getters: false, reduce_vars: true, } input: { function f() { function g() {} g.a = function() {}; g.b = g.a; return g; } } expect: { function f() { function g() {} g.a = function() {}; g.b = g.a; return g; } } } collapse_vars_2_strict: { options = { collapse_vars: true, pure_getters: "strict", reduce_vars: true, } input: { function f() { function g() {} g.a = function() {}; g.b = g.a; return g; } } expect: { function f() { function g() {} g.b = g.a = function() {}; return g; } } } collapse_rhs_true: { options = { collapse_vars: true, evaluate: true, pure_getters: true, } input: { console.log((42..length = "PASS", "PASS")); console.log(("foo".length = "PASS", "PASS")); console.log((false.length = "PASS", "PASS")); console.log((function() {}.length = "PASS", "PASS")); console.log(({ get length() { return "FAIL"; } }.length = "PASS", "PASS")); } expect: { console.log(42..length = "PASS"); console.log("foo".length = "PASS"); console.log(false.length = "PASS"); console.log(function() {}.length = "PASS"); console.log({ get length() { return "FAIL"; } }.length = "PASS"); } expect_stdout: [ "PASS", "PASS", "PASS", "PASS", "PASS", ] } collapse_rhs_false: { options = { collapse_vars: true, evaluate: true, pure_getters: false, } input: { console.log((42..length = "PASS", "PASS")); console.log(("foo".length = "PASS", "PASS")); console.log((false.length = "PASS", "PASS")); console.log((function() {}.length = "PASS", "PASS")); console.log(({ get length() { return "FAIL"; } }.length = "PASS", "PASS")); } expect: { console.log(42..length = "PASS"); console.log("foo".length = "PASS"); console.log(false.length = "PASS"); console.log(function() {}.length = "PASS"); console.log({ get length() { return "FAIL"; } }.length = "PASS"); } expect_stdout: [ "PASS", "PASS", "PASS", "PASS", "PASS", ] } collapse_rhs_strict: { options = { collapse_vars: true, evaluate: true, pure_getters: "strict", } input: { console.log((42..length = "PASS", "PASS")); console.log(("foo".length = "PASS", "PASS")); console.log((false.length = "PASS", "PASS")); console.log((function() {}.length = "PASS", "PASS")); console.log(({ get length() { return "FAIL"; } }.length = "PASS", "PASS")); } expect: { console.log(42..length = "PASS"); console.log("foo".length = "PASS"); console.log(false.length = "PASS"); console.log(function() {}.length = "PASS"); console.log({ get length() { return "FAIL"; } }.length = "PASS"); } expect_stdout: [ "PASS", "PASS", "PASS", "PASS", "PASS", ] } collapse_rhs_setter: { options = { collapse_vars: true, evaluate: true, pure_getters: "strict", } input: { try { console.log(({ set length(v) { throw "PASS"; } }.length = "FAIL", "FAIL")); } catch (e) { console.log(e); } } expect: { try { console.log({ set length(v) { throw "PASS"; } }.length = "FAIL"); } catch (e) { console.log(e); } } expect_stdout: "PASS" } collapse_rhs_call: { options = { collapse_vars: true, passes: 2, pure_getters: "strict", reduce_vars: true, toplevel: true, unused: true, } input: { var o = {}; function f() { console.log("PASS"); } o.f = f; f(); } expect: { ({}.f = function() { console.log("PASS"); })(); } expect_stdout: "PASS" } collapse_rhs_lhs: { options = { collapse_vars: true, pure_getters: true, } input: { function f(a, b) { a.b = b, b += 2; console.log(a.b, b); } f({}, 1); } expect: { function f(a, b) { a.b = b, b += 2; console.log(a.b, b); } f({}, 1); } expect_stdout: "1 3" } drop_arguments: { options = { pure_getters: "strict", side_effects: true, } input: { (function() { arguments.slice = function() { console.log("PASS"); }; arguments[42]; arguments.length; arguments.slice(); })(); } expect: { (function() { arguments.slice = function() { console.log("PASS"); }; arguments.slice(); })(); } expect_stdout: "PASS" } lvalues_def: { options = { collapse_vars: true, pure_getters: true, side_effects: true, unused: true, } input: { var a = 0, b = 1; var a = b++, b = +function() {}(); a && a[a++]; console.log(a, b); } expect: { var a = 0, b = 1; a = b++, b = +void 0; a && a++; console.log(a, b); } expect_stdout: true } side_effects_assign: { options = { evaluate: true, pure_getters: true, reduce_funcs: true, reduce_vars: true, sequences: true, side_effects: true, toplevel: true, } input: { var a = typeof void (a && a.in == 1, 0); console.log(a); } expect: { var a = "undefined"; console.log(a); } expect_stdout: "undefined" } issue_2062: { options = { booleans: true, collapse_vars: true, conditionals: true, pure_getters: true, side_effects: true, } input: { var a = 1; if ([ a || a++ + a--, a++ + a--, a && a.var ]); console.log(a); } expect: { var a = 1; a || (a++, a--), a++, a--; console.log(a); } expect_stdout: "1" } issue_2878: { options = { collapse_vars: true, pure_getters: true, sequences: true, } input: { var c = 0; (function(a, b) { function f2() { if (a) c++; } b = f2(); a = 1; b && b.b; f2(); })(); console.log(c); } expect: { var c = 0; (function(a, b) { function f2() { if (a) c++; } b = f2(), a = 1, f2(); })(), console.log(c); } expect_stdout: "1" } issue_3427: { options = { assignments: true, evaluate: true, inline: true, pure_getters: "strict", reduce_vars: true, sequences: true, side_effects: true, toplevel: true, unused: true, } input: { var a; (function(b) { b.p = 42; })(a || (a = {})); } expect: {} expect_stdout: true } issue_3490_1: { options = { conditionals: true, dead_code: true, inline: true, pure_getters: true, sequences: true, side_effects: true, toplevel: true, } input: { var b = 42, c = "FAIL"; if ({ 3: function() { var a; return (a && a.p) < this; }(), }) c = "PASS"; if (b) while ("" == typeof d); console.log(c, b); } expect: { var b = 42, c = "FAIL"; if (function() { var a; }(), c = "PASS", b) while ("" == typeof d); console.log(c, b); } expect_stdout: "PASS 42" } issue_4135: { options = { evaluate: true, inline: true, merge_vars: true, pure_getters: true, reduce_vars: true, side_effects: true, toplevel: true, unused: true, } input: { var a = 0, b = 0; --b; a++; if (!a) var c = function() { var d = 0; function f() { d && d.p; } f(); this; }(a++); console.log(a, b, c); } expect: { var a = 0; 0; a++; if (!a) var c = void a++; console.log(a, -1, c); } expect_stdout: "1 -1 undefined" } issue_4440: { options = { pure_getters: "strict", side_effects: true, unused: true, } input: { try { (function() { arguments = null; console.log(arguments.p = "FAIL"); })(); } catch (e) { console.log("PASS"); } } expect: { try { (function() { arguments = null; console.log(arguments.p = "FAIL"); })(); } catch (e) { console.log("PASS"); } } expect_stdout: "PASS" } issue_4730_1: { options = { pure_getters: true, side_effects: true, } input: { var a; console.log("PASS") + (a && a[a.p]); } expect: { var a; console.log("PASS"); } expect_stdout: "PASS" } issue_4730_2: { options = { pure_getters: true, side_effects: true, } input: { var a; !console.log("PASS") || a && a[a.p]; } expect: { var a; console.log("PASS"); } expect_stdout: "PASS" } issue_4751: { options = { pure_getters: true, side_effects: true, } input: { var o = { get p() { console.log("PASS"); }, }; o && o.p; } expect: { var o = { get p() { console.log("PASS"); }, }; } } super_toString: { options = { pure_getters: true, unsafe: true, } input: { console.log({ f() { return super.toString(); }, }.f()); } expect: { console.log({ f() { return super.toString(); }, }.f()); } expect_stdout: "[object Object]" node_version: ">=4" } this_toString: { options = { pure_getters: true, unsafe: true, } input: { console.log({ f() { return this.toString(); }, }.f()); } expect: { console.log({ f() { return "" + this; }, }.f()); } expect_stdout: "[object Object]" node_version: ">=4" } issue_4803: { options = { hoist_vars: true, pure_getters: "strict", reduce_vars: true, side_effects: true, toplevel: true, } input: { var o = { get f() { console.log("PASS"); }, } || 42; for (var k in o) o[k]; } expect: { var k, o = { get f() { console.log("PASS"); }, } || 42; for (k in o) o[k]; } expect_stdout: "PASS" } nested_property_assignments_1: { options = { pure_getters: "strict", reduce_vars: true, sequences: true, side_effects: true, toplevel: true, unused: true, } input: { var f; ((f = function() { console.log("FAIL"); }).p = f).q = console.log("PASS"); } expect: { console.log("PASS"); } expect_stdout: "PASS" } nested_property_assignments_2: { options = { pure_getters: "strict", unused: true, } input: { var o = {}; (function() { var a; (o.p = a = {}).q = "PASS"; })(); console.log(o.p.q); } expect: { var o = {}; (function() { (o.p = {}).q = "PASS"; })(); console.log(o.p.q); } expect_stdout: "PASS" } nested_property_assignments_3: { options = { collapse_vars: true, pure_getters: true, side_effects: true, unused: true, } input: { var o = { p: {} }; (function(a) { console && a; if (console) { a = a.p; a.q = a; } })(o); console.log(o.p.q === o.p ? "PASS" : "FAIL"); } expect: { var o = { p: {} }; (function(a) { console; if (console) (a = a.p).q = a; })(o); console.log(o.p.q === o.p ? "PASS" : "FAIL"); } expect_stdout: "PASS" } issue_4939: { options = { pure_getters: "strict", side_effects: true, } input: { ({ __proto__: { get p() { console.log("PASS"); }, }, }).p; } expect: { ({ __proto__: { get p() { console.log("PASS"); }, }, }).p; } expect_stdout: "PASS" }