UglifyJS/test/mocha/minify.js

var Uglify = require('../../');
var assert = require("assert");
var readFileSync = require("fs").readFileSync;

function read(path) {
    return readFileSync(path, "utf8");
}

describe("minify", function() {
    it("Should test basic sanity of minify with default options", function() {
        var js = 'function foo(bar) { if (bar) return 3; else return 7; var u = not_called(); }';
        var result = Uglify.minify(js);
        assert.strictEqual(result.code, 'function foo(n){return n?3:7}');
    });

    describe("keep_quoted_props", function() {
        it("Should preserve quotes in object literals", function() {
            var js = 'var foo = {"x": 1, y: 2, \'z\': 3};';
            var result = Uglify.minify(js, {
                output: {
                    keep_quoted_props: true
                }});
            assert.strictEqual(result.code, 'var foo={"x":1,y:2,"z":3};');
        });

        it("Should preserve quote styles when quote_style is 3", function() {
            var js = 'var foo = {"x": 1, y: 2, \'z\': 3};';
            var result = Uglify.minify(js, {
                output: {
                    keep_quoted_props: true,
                    quote_style: 3
                }});
            assert.strictEqual(result.code, 'var foo={"x":1,y:2,\'z\':3};');
        });

        it("Should not preserve quotes in object literals when disabled", function() {
            var js = 'var foo = {"x": 1, y: 2, \'z\': 3};';
            var result = Uglify.minify(js, {
                output: {
                    keep_quoted_props: false,
                    quote_style: 3
                }});
            assert.strictEqual(result.code, 'var foo={x:1,y:2,z:3};');
        });
    });

    describe("mangleProperties", function() {
        it("Shouldn't mangle quoted properties", function() {
            var js = 'a["foo"] = "bar"; a.color = "red"; x = {"bar": 10};';
            var result = Uglify.minify(js, {
                compress: {
                    properties: false
                },
                mangle: {
                    properties: {
                        keep_quoted: true
                    }
                },
                output: {
                    keep_quoted_props: true,
                    quote_style: 3
                }
            });
            assert.strictEqual(result.code,
                    'a["foo"]="bar",a.a="red",x={"bar":10};');
        });
    });

    describe("inSourceMap", function() {
        it("Should read the given string filename correctly when sourceMapIncludeSources is enabled (#1236)", function() {
            var result = Uglify.minify(read("./test/input/issue-1236/simple.js"), {
                sourceMap: {
                    content: read("./test/input/issue-1236/simple.js.map"),
                    filename: "simple.min.js",
                    includeSources: true
                }
            });

            var map = JSON.parse(result.map);

            assert.equal(map.file, 'simple.min.js');
            assert.equal(map.sourcesContent.length, 1);
            assert.equal(map.sourcesContent[0],
                'let foo = x => "foo " + x;\nconsole.log(foo("bar"));');
        });
        it("Should process inline source map", function() {
            var code = Uglify.minify(read("./test/input/issue-520/input.js"), {
                compress: { toplevel: true },
                sourceMap: {
                    content: "inline",
                    url: "inline"
                }
            }).code + "\n";
            assert.strictEqual(code, readFileSync("test/input/issue-520/output.js", "utf8"));
        });
        it("Should warn for missing inline source map", function() {
            var warn_function = Uglify.AST_Node.warn_function;
            var warnings = [];
            Uglify.AST_Node.warn_function = function(txt) {
                warnings.push(txt);
            };
            try {
                var result = Uglify.minify(read("./test/input/issue-1323/sample.js"), {
                    mangle: false,
                    sourceMap: {
                        content: "inline"
                    }
                });
                assert.strictEqual(result.code, "var bar=function(){function foo(bar){return bar}return foo}();");
                assert.strictEqual(warnings.length, 1);
                assert.strictEqual(warnings[0], "inline source map not found");
            } finally {
                Uglify.AST_Node.warn_function = warn_function;
            }
        });
        it("Should fail with multiple input and inline source map", function() {
            var result = Uglify.minify([
                read("./test/input/issue-520/input.js"),
                read("./test/input/issue-520/output.js")
            ], {
                sourceMap: {
                    content: "inline",
                    url: "inline"
                }
            });
            var err = result.error;
            assert.ok(err instanceof Error);
            assert.strictEqual(err.stack.split(/\n/)[0], "Error: inline source map only works with singular input");
        });
    });

    describe("sourceMapInline", function() {
        it("should append source map to output js when sourceMapInline is enabled", function() {
            var result = Uglify.minify('var a = function(foo) { return foo; };', {
                sourceMap: {
                    url: "inline"
                }
            });
            var code = result.code;
            assert.strictEqual(code, "var a=function(n){return n};\n" +
                "//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbIjAiXSwibmFtZXMiOlsiYSIsImZvbyJdLCJtYXBwaW5ncyI6IkFBQUEsR0FBSUEsR0FBSSxTQUFTQyxHQUFPLE1BQU9BIn0=");
        });
        it("should not append source map to output js when sourceMapInline is not enabled", function() {
            var result = Uglify.minify('var a = function(foo) { return foo; };');
            var code = result.code;
            assert.strictEqual(code, "var a=function(n){return n};");
        });
    });

    describe("#__PURE__", function() {
        it("should drop #__PURE__ hint after use", function() {
            var result = Uglify.minify('//@__PURE__ comment1 #__PURE__ comment2\n foo(), bar();', {
                output: {
                    comments: "all",
                    beautify: false,
                }
            });
            var code = result.code;
            assert.strictEqual(code, "//  comment1   comment2\nbar();");
        });
        it("should not drop #__PURE__ hint if function is retained", function() {
            var result = Uglify.minify("var a = /*#__PURE__*/(function(){ foo(); })();", {
                output: {
                    comments: "all",
                    beautify: false,
                }
            });
            var code = result.code;
            assert.strictEqual(code, "var a=/*#__PURE__*/function(){foo()}();");
        })
    });

    describe("JS_Parse_Error", function() {
        it("should return syntax error", function() {
            var result = Uglify.minify("function f(a{}");
            var err = result.error;
            assert.ok(err instanceof Error);
            assert.strictEqual(err.stack.split(/\n/)[0], "SyntaxError: Unexpected token punc «{», expected punc «,»");
            assert.strictEqual(err.filename, "0");
            assert.strictEqual(err.line, 1);
            assert.strictEqual(err.col, 12);
        });
    });

    describe("global_defs", function() {
        it("should throw for non-trivial expressions", function() {
            var result = Uglify.minify("alert(42);", {
                compress: {
                    global_defs: {
                        "@alert": "debugger"
                    }
                }
            });
            var err = result.error;
            assert.ok(err instanceof Error);
            assert.strictEqual(err.stack.split(/\n/)[0], "Error: Can't handle expression: debugger");
        });
    });
});