functions.js

non_ascii_function_identifier_name: {
    input: {
        function fooλ(δλ) {}
        function λ(δλ) {}
        (function λ(δλ) {})()
    }
    expect_exact: "function fooλ(δλ){}function λ(δλ){}(function λ(δλ){})();"
}

iifes_returning_constants_keep_fargs_true: {
    options = {
        keep_fargs    : true,
        side_effects  : true,
        evaluate      : true,
        unused        : true,
        dead_code     : true,
        conditionals  : true,
        comparisons   : true,
        booleans      : true,
        if_return     : true,
        join_vars     : true,
        reduce_funcs  : true,
        reduce_vars   : true,
        collapse_vars : true,
        inline        : true,
    }
    input: {
        (function(){ return -1.23; }());
        console.log( function foo(){ return "okay"; }() );
        console.log( function foo(x, y, z){ return 123; }() );
        console.log( function(x, y, z){ return z; }() );
        console.log( function(x, y, z){ if (x) return y; return z; }(1, 2, 3) );
        console.log( function(x, y){ return x * y; }(2, 3) );
        console.log( function(x, y){ return x * y; }(2, 3, a(), b()) );
    }
    expect: {
        console.log("okay");
        console.log(123);
        console.log(void 0);
        console.log(2);
        console.log(6);
        console.log((a(), b(), 6));
    }
    expect_stdout: true
}

iifes_returning_constants_keep_fargs_false: {
    options = {
        keep_fargs    : false,
        side_effects  : true,
        evaluate      : true,
        unused        : true,
        dead_code     : true,
        conditionals  : true,
        comparisons   : true,
        booleans      : true,
        if_return     : true,
        join_vars     : true,
        reduce_funcs  : true,
        reduce_vars   : true,
        collapse_vars : true,
        inline        : true,
    }
    input: {
        (function(){ return -1.23; }());
        console.log( function foo(){ return "okay"; }() );
        console.log( function foo(x, y, z){ return 123; }() );
        console.log( function(x, y, z){ return z; }() );
        console.log( function(x, y, z){ if (x) return y; return z; }(1, 2, 3) );
        console.log( function(x, y){ return x * y; }(2, 3) );
        console.log( function(x, y){ return x * y; }(2, 3, a(), b()) );
    }
    expect: {
        console.log("okay");
        console.log(123);
        console.log(void 0);
        console.log(2);
        console.log(6);
        console.log((a(), b(), 6));
    }
    expect_stdout: true
}

issue_485_crashing_1530: {
    options = {
        conditionals: true,
        dead_code: true,
        evaluate: true,
        inline: true,
        side_effects: true,
    }
    input: {
        (function(a) {
            if (true) return;
            var b = 42;
        })(this);
    }
    expect: {}
}

issue_1841_1: {
    options = {
        keep_fargs: false,
        pure_getters: "strict",
        reduce_funcs: true,
        reduce_vars: true,
        unused: true,
    }
    input: {
        var b = 10;
        !function(arg) {
            for (var key in "hi")
                var n = arg.baz, n = [ b = 42 ];
        }(--b);
        console.log(b);
    }
    expect: {
        var b = 10;
        !function() {
            for (var key in "hi")
                b = 42;
        }(--b);
        console.log(b);
    }
    expect_exact: "42"
}

issue_1841_2: {
    options = {
        keep_fargs: false,
        pure_getters: false,
        reduce_funcs: true,
        reduce_vars: true,
        unused: true,
    }
    input: {
        var b = 10;
        !function(arg) {
            for (var key in "hi")
                var n = arg.baz, n = [ b = 42 ];
        }(--b);
        console.log(b);
    }
    expect: {
        var b = 10;
        !function(arg) {
            for (var key in "hi")
                arg.baz, b = 42;
        }(--b);
        console.log(b);
    }
    expect_exact: "42"
}

function_returning_constant_literal: {
    options = {
        inline: true,
        passes: 2,
        properties: true,
        reduce_funcs: true,
        reduce_vars: true,
        side_effects: true,
        toplevel: true,
        unused: true,
    }
    input: {
        function greeter() {
            return { message: 'Hello there' };
        }
        var greeting = greeter();
        console.log(greeting.message);
    }
    expect: {
        console.log("Hello there");
    }
    expect_stdout: "Hello there"
}

hoist_funs: {
    options = {
        hoist_funs: true,
    }
    input: {
        console.log(1, typeof f, typeof g);
        if (console.log(2, typeof f, typeof g))
            console.log(3, typeof f, typeof g);
        else {
            console.log(4, typeof f, typeof g);
            function f() {}
            console.log(5, typeof f, typeof g);
        }
        function g() {}
        console.log(6, typeof f, typeof g);
    }
    expect: {
        function f() {}
        function g() {}
        console.log(1, typeof f, typeof g);
        if (console.log(2, typeof f, typeof g))
            console.log(3, typeof f, typeof g);
        else {
            console.log(4, typeof f, typeof g);
            console.log(5, typeof f, typeof g);
        }
        console.log(6, typeof f, typeof g);
    }
    expect_stdout: [
        "1 'function' 'function'",
        "2 'function' 'function'",
        "4 'function' 'function'",
        "5 'function' 'function'",
        "6 'function' 'function'",
    ]
    node_version: "<=4"
}

hoist_funs_strict: {
    options = {
        hoist_funs: true,
    }
    input: {
        "use strict";
        console.log(1, typeof f, typeof g);
        if (console.log(2, typeof f, typeof g))
            console.log(3, typeof f, typeof g);
        else {
            console.log(4, typeof f, typeof g);
            function f() {}
            console.log(5, typeof f, typeof g);
        }
        function g() {}
        console.log(6, typeof f, typeof g);
    }
    expect: {
        "use strict";
        function g() {}
        console.log(1, typeof f, typeof g);
        if (console.log(2, typeof f, typeof g))
            console.log(3, typeof f, typeof g);
        else {
            console.log(4, typeof f, typeof g);
            function f() {}
            console.log(5, typeof f, typeof g);
        }
        console.log(6, typeof f, typeof g);
    }
    expect_stdout: [
        "1 'undefined' 'function'",
        "2 'undefined' 'function'",
        "4 'function' 'function'",
        "5 'function' 'function'",
        "6 'undefined' 'function'",
    ]
    node_version: ">=4"
}

issue_203: {
    options = {
        keep_fargs: false,
        side_effects: true,
        unsafe_Func: true,
        unused: true,
    }
    input: {
        var m = {};
        var fn = Function("require", "module", "exports", "module.exports = 42;");
        fn(null, m, m.exports);
        console.log(m.exports);
    }
    expect: {
        var m = {};
        var fn = Function("n,o", "o.exports=42");
        fn(null, m, m.exports);
        console.log(m.exports);
    }
    expect_stdout: "42"
}

no_webkit: {
    beautify = {
        webkit: false,
    }
    input: {
        console.log(function() {
            1 + 1;
        }.a = 1);
    }
    expect_exact: "console.log(function(){1+1}.a=1);"
    expect_stdout: "1"
}

webkit: {
    beautify = {
        webkit: true,
    }
    input: {
        console.log(function() {
            1 + 1;
        }.a = 1);
    }
    expect_exact: "console.log((function(){1+1}).a=1);"
    expect_stdout: "1"
}

issue_2084: {
    options = {
        collapse_vars: true,
        conditionals: true,
        evaluate: true,
        inline: true,
        passes: 2,
        reduce_funcs: true,
        reduce_vars: true,
        sequences: true,
        side_effects: true,
        unused: true,
    }
    input: {
        var c = 0;
        !function() {
            !function(c) {
                c = 1 + c;
                var c = 0;
                function f14(a_1) {
                    if (c = 1 + c, 0 !== 23..toString())
                        c = 1 + c, a_1 && (a_1[0] = 0);
                }
                f14();
            }(-1);
        }();
        console.log(c);
    }
    expect: {
        var c = 0;
        !function(c) {
            c = 1 + c,
            c = 1 + (c = 0),
            0 !== 23..toString() && (c = 1 + c);
        }(-1),
        console.log(c);
    }
    expect_stdout: "0"
}

issue_2097: {
    options = {
        negate_iife: true,
        reduce_funcs: true,
        reduce_vars: true,
        toplevel: true,
        unused: true,
    }
    input: {
        function f() {
            try {
                throw 0;
            } catch (e) {
                console.log(arguments[0]);
            }
        }
        f(1);
    }
    expect: {
        !function() {
            try {
                throw 0;
            } catch (e) {
                console.log(arguments[0]);
            }
        }(1);
    }
    expect_stdout: "1"
}

issue_2101: {
    options = {
        inline: true,
    }
    input: {
        a = {};
        console.log(function() {
            return function() {
                return this.a;
            }();
        }() === function() {
            return a;
        }());
    }
    expect: {
        a = {};
        console.log(function() {
            return this.a;
        }() === a);
    }
    expect_stdout: "true"
}

inner_ref: {
    options = {
        inline: true,
        unused: true,
    }
    input: {
        console.log(function(a) {
            return function() {
                return a;
            }();
        }(1), function(a) {
            return function(a) {
                return a;
            }();
        }(2));
    }
    expect: {
        console.log(function(a) {
            return a;
        }(1), function(a) {
            return a;
        }());
    }
    expect_stdout: "1 undefined"
}

issue_2107: {
    options = {
        collapse_vars: true,
        inline: true,
        passes: 3,
        sequences: true,
        side_effects: true,
        unused: true,
    }
    input: {
        var c = 0;
        !function() {
            c++;
        }(c++ + new function() {
            this.a = 0;
            var a = (c = c + 1) + (c = 1 + c);
            return c++ + a;
        }());
        console.log(c);
    }
    expect: {
        var c = 0;
        c++, new function() {
            this.a = 0, c = 1 + (c += 1), c++;
        }(), c++, console.log(c);
    }
    expect_stdout: "5"
}

issue_2114_1: {
    options = {
        collapse_vars: true,
        if_return: true,
        inline: true,
        keep_fargs: false,
        side_effects: true,
        unused: true,
    }
    input: {
        var c = 0;
        !function(a) {
            a = 0;
        }([ {
            0: c = c + 1,
            length: c = 1 + c
        }, typeof void function a() {
            var b = function f1(a) {
            }(b && (b.b += (c = c + 1, 0)));
        }() ]);
        console.log(c);
    }
    expect: {
        var c = 0;
        c = 1 + (c += 1), function() {
            var b = void (b && (b.b += (c += 1, 0)));
        }();
        console.log(c);
    }
    expect_stdout: "2"
}

issue_2114_2: {
    options = {
        collapse_vars: true,
        if_return: true,
        inline: true,
        keep_fargs: false,
        passes: 2,
        side_effects: true,
        unused: true,
    }
    input: {
        var c = 0;
        !function(a) {
            a = 0;
        }([ {
            0: c = c + 1,
            length: c = 1 + c
        }, typeof void function a() {
            var b = function f1(a) {
            }(b && (b.b += (c = c + 1, 0)));
        }() ]);
        console.log(c);
    }
    expect: {
        var c = 0;
        c = 1 + (c += 1), function() {
            var b = void (b && (b.b += (c += 1, 0)));
        }();
        console.log(c);
    }
    expect_stdout: "2"
}

issue_2428: {
    options = {
        collapse_vars: true,
        inline: true,
        passes: 3,
        pure_getters: "strict",
        reduce_funcs: true,
        reduce_vars: true,
        side_effects: true,
        toplevel: true,
        unsafe: true,
        unused: true,
    }
    input: {
        function bar(k) {
            console.log(k);
        }
        function foo(x) {
            return bar(x);
        }
        function baz(a) {
            foo(a);
        }
        baz(42);
        baz("PASS");
    }
    expect: {
        function baz(a) {
            console.log(a);
        }
        baz(42);
        baz("PASS");
    }
    expect_stdout: [
        "42",
        "PASS",
    ]
}

issue_2531_1: {
    options = {
        evaluate: true,
        inline: true,
        reduce_funcs: true,
        reduce_vars: true,
        unused: true,
    }
    input: {
        function outer() {
            function inner(value) {
                function closure() {
                    return value;
                }
                return function() {
                    return closure();
                };
            }
            return inner("Hello");
        }
        console.log("Greeting:", outer()());
    }
    expect: {
        function outer() {
            return value = "Hello", function() {
                return value;
            };
            var value;
        }
        console.log("Greeting:", outer()());
    }
    expect_stdout: "Greeting: Hello"
}

issue_2531_2: {
    options = {
        evaluate: true,
        inline: true,
        passes: 3,
        reduce_funcs: true,
        reduce_vars: true,
        side_effects: true,
        unused: true,
    }
    input: {
        function outer() {
            function inner(value) {
                function closure() {
                    return value;
                }
                return function() {
                    return closure();
                };
            }
            return inner("Hello");
        }
        console.log("Greeting:", outer()());
    }
    expect: {
        function outer() {
            return function() {
                return "Hello";
            };
        }
        console.log("Greeting:", outer()());
    }
    expect_stdout: "Greeting: Hello"
}

issue_2531_3: {
    options = {
        evaluate: true,
        inline: true,
        passes: 3,
        reduce_funcs: true,
        reduce_vars: true,
        side_effects: true,
        toplevel: true,
        unused: true,
    }
    input: {
        function outer() {
            function inner(value) {
                function closure() {
                    return value;
                }
                return function() {
                    return closure();
                };
            }
            return inner("Hello");
        }
        console.log("Greeting:", outer()());
    }
    expect: {
        console.log("Greeting:", "Hello");
    }
    expect_stdout: "Greeting: Hello"
}

empty_body: {
    options = {
        reduce_vars: true,
        side_effects: true,
    }
    input: {
        function f() {
            function noop() {}
            noop();
            return noop;
        }
    }
    expect: {
        function f() {
            function noop() {}
            return noop;
        }
    }
}

inline_loop_1: {
    options = {
        inline: true,
        reduce_vars: true,
        toplevel: true,
        unused: true,
    }
    input: {
        function f() {
            return x();
        }
        for (;;) f();
    }
    expect: {
        for (;;) x();
    }
}

inline_loop_2: {
    options = {
        inline: true,
        reduce_vars: true,
        toplevel: true,
        unused: true,
    }
    input: {
        for (;;) f();
        function f() {
            return x();
        }
    }
    expect: {
        for (;;) x();
    }
}

inline_loop_3: {
    options = {
        inline: true,
        reduce_vars: true,
        toplevel: true,
        unused: true,
    }
    input: {
        var f = function() {
            return x();
        };
        for (;;) f();
    }
    expect: {
        for (;;) x();
    }
}

inline_loop_4: {
    options = {
        inline: true,
        reduce_vars: true,
        toplevel: true,
        unused: true,
    }
    input: {
        for (;;) f();
        var f = function() {
            return x();
        };
    }
    expect: {
        for (;;) f();
        var f = function() {
            return x();
        };
    }
}

issue_2476: {
    options = {
        inline: true,
        reduce_vars: true,
        toplevel: true,
        unused: true,
    }
    input: {
        function foo(x, y, z) {
            return x < y ? x * y + z : x * z - y;
        }
        for (var sum = 0, i = 0; i < 10; i++)
            sum += foo(i, i + 1, 3 * i);
        console.log(sum);
    }
    expect: {
        for (var sum = 0, i = 0; i < 10; i++)
            sum += (x = i, y = i + 1, z = 3 * i, x < y ? x * y + z : x * z - y);
        var x, y, z;
        console.log(sum);
    }
    expect_stdout: "465"
}

issue_2601_1: {
    options = {
        inline: true,
        reduce_vars: true,
        sequences: true,
        side_effects: true,
        unused: true,
    }
    input: {
        var a = "FAIL";
        (function() {
            function f(b) {
                function g(b) {
                    b && b();
                }
                g();
                (function() {
                    b && (a = "PASS");
                })();
            }
            f("foo");
        })();
        console.log(a);
    }
    expect: {
        var a = "FAIL";
        (function() {
            b = "foo",
            function(b) {
                b && b();
            }(),
            b && (a = "PASS");
            var b;
        })(),
        console.log(a);
    }
    expect_stdout: "PASS"
}

issue_2601_2: {
    rename = true
    options = {
        evaluate: true,
        inline: true,
        passes: 3,
        reduce_vars: true,
        sequences: true,
        side_effects: true,
        unused: true,
    }
    mangle = {}
    input: {
        var a = "FAIL";
        (function() {
            function f(b) {
                function g(b) {
                    b && b();
                }
                g();
                (function() {
                    b && (a = "PASS");
                })();
            }
            f("foo");
        })();
        console.log(a);
    }
    expect: {
        var a = "FAIL";
        a = "PASS",
        console.log(a);
    }
    expect_stdout: "PASS"
}

issue_2604_1: {
    options = {
        inline: true,
        side_effects: true,
        unused: true,
    }
    input: {
        var a = "FAIL";
        (function() {
            try {
                throw 1;
            } catch (b) {
                (function f(b) {
                    b && b();
                })();
                b && (a = "PASS");
            }
        })();
        console.log(a);
    }
    expect: {
        var a = "FAIL";
        (function() {
            try {
                throw 1;
            } catch (b) {
                (function(b) {
                    b && b();
                })();
                b && (a = "PASS");
            }
        })();
        console.log(a);
    }
    expect_stdout: "PASS"
}

issue_2604_2: {
    rename = true
    options = {
        evaluate: true,
        inline: true,
        passes: 3,
        reduce_vars: true,
        side_effects: true,
        unused: true,
    }
    mangle = {}
    input: {
        var a = "FAIL";
        (function() {
            try {
                throw 1;
            } catch (b) {
                (function f(b) {
                    b && b();
                })();
                b && (a = "PASS");
            }
        })();
        console.log(a);
    }
    expect: {
        var a = "FAIL";
        (function() {
            try {
                throw 1;
            } catch (o) {
                o && (a = "PASS");
            }
        })();
        console.log(a);
    }
    expect_stdout: "PASS"
}

unsafe_apply_1: {
    options = {
        inline: true,
        passes: 2,
        reduce_vars: true,
        side_effects: true,
        unsafe: true,
        unused: true,
    }
    input: {
        (function(a, b) {
            console.log(a, b);
        }).apply("foo", [ "bar" ]);
        (function(a, b) {
            console.log(this, a, b);
        }).apply("foo", [ "bar" ]);
        (function(a, b) {
            console.log(a, b);
        }).apply("foo", [ "bar" ], "baz");
    }
    expect: {
        console.log("bar", void 0);
        (function(a, b) {
            console.log(this, a, b);
        }).call("foo", "bar");
        (function(a, b) {
            console.log(a, b);
        }).apply("foo", [ "bar" ], "baz");
    }
    expect_stdout: true
}

unsafe_apply_2: {
    options = {
        reduce_vars: true,
        side_effects: true,
        toplevel: true,
        unsafe: true,
    }
    input: {
        function foo() {
            console.log(a, b);
        }
        var bar = function(a, b) {
            console.log(this, a, b);
        }
        (function() {
            foo.apply("foo", [ "bar" ]);
            bar.apply("foo", [ "bar" ]);
        })();
    }
    expect: {
        function foo() {
            console.log(a, b);
        }
        var bar = function(a, b) {
            console.log(this, a, b);
        }
        (function() {
            foo("bar");
            bar.call("foo", "bar");
        })();
    }
    expect_stdout: true
}

unsafe_call_1: {
    options = {
        inline: true,
        passes: 2,
        reduce_vars: true,
        side_effects: true,
        unsafe: true,
        unused: true,
    }
    input: {
        (function(a, b) {
            console.log(a, b);
        }).call("foo", "bar");
        (function(a, b) {
            console.log(this, a, b);
        }).call("foo", "bar");
    }
    expect: {
        console.log("bar", void 0);
        (function(a, b) {
            console.log(this, a, b);
        }).call("foo", "bar");
    }
    expect_stdout: true
}

unsafe_call_2: {
    options = {
        reduce_vars: true,
        side_effects: true,
        toplevel: true,
        unsafe: true,
    }
    input: {
        function foo() {
            console.log(a, b);
        }
        var bar = function(a, b) {
            console.log(this, a, b);
        }
        (function() {
            foo.call("foo", "bar");
            bar.call("foo", "bar");
        })();
    }
    expect: {
        function foo() {
            console.log(a, b);
        }
        var bar = function(a, b) {
            console.log(this, a, b);
        }
        (function() {
            foo("bar");
            bar.call("foo", "bar");
        })();
    }
    expect_stdout: true
}

unsafe_call_3: {
    options = {
        side_effects: true,
        unsafe: true,
    }
    input: {
        console.log(function() {
            return arguments[0] + eval("arguments")[1];
        }.call(0, 1, 2));
    }
    expect: {
        console.log(function() {
            return arguments[0] + eval("arguments")[1];
        }(1, 2));
    }
    expect_stdout: "3"
}

issue_2616: {
    options = {
        evaluate: true,
        inline: true,
        reduce_vars: true,
        side_effects: true,
        unused: true,
    }
    input: {
        var c = "FAIL";
        (function() {
            function f() {
                function g(NaN) {
                    (true << NaN) - 0/0 || (c = "PASS");
                }
                g([]);
            }
            f();
        })();
        console.log(c);
    }
    expect: {
        var c = "FAIL";
        (function() {
            (function() {
                NaN = [], (true << NaN) - 0/0 || (c = "PASS");
                var NaN;
            })();
        })();
        console.log(c);
    }
    expect_stdout: "PASS"
}

issue_2620_1: {
    options = {
        inline: true,
        reduce_vars: true,
        sequences: true,
        side_effects: true,
        unused: true,
    }
    input: {
        var c = "FAIL";
        (function() {
            function f(a) {
                var b = function g(a) {
                    a && a();
                }();
                if (a) {
                    var d = c = "PASS";
                }
            }
            f(1);
        })();
        console.log(c);
    }
    expect: {
        var c = "FAIL";
        (function() {
            (function(a) {
                if (function(a) {
                    a && a();
                }(), a) c = "PASS";
            })(1);
        })(),
        console.log(c);
    }
    expect_stdout: "PASS"
}

issue_2620_2: {
    options = {
        conditionals: true,
        evaluate: true,
        inline: true,
        passes: 2,
        reduce_vars: true,
        sequences: true,
        side_effects: true,
        unused: true,
    }
    input: {
        var c = "FAIL";
        (function() {
            function f(a) {
                var b = function g(a) {
                    a && a();
                }();
                if (a) {
                    var d = c = "PASS";
                }
            }
            f(1);
        })();
        console.log(c);
    }
    expect: {
        var c = "FAIL";
        c = "PASS",
        console.log(c);
    }
    expect_stdout: "PASS"
}