TypeScript/tests/baselines/reference/typeGuardsInFunctionAndModuleBlock.js

//// [typeGuardsInFunctionAndModuleBlock.ts]
// typeguards are scoped in function/module block

function foo(x: number | string | boolean) {
    return typeof x === "string"
        ? x
        : function f() {
            var b = x; // number | boolean
            return typeof x === "boolean"
                ? x.toString() // boolean
                : x.toString(); // number
        } ();
}
function foo2(x: number | string | boolean) {
    return typeof x === "string"
        ? x
        : function f(a: number | boolean) {
            var b = x; // new scope - number | boolean
            return typeof x === "boolean"
                ? x.toString() // boolean
                : x.toString(); // number
        } (x); // x here is narrowed to number | boolean
}
function foo3(x: number | string | boolean) {
    return typeof x === "string"
        ? x
        : (() => {
            var b = x; // new scope - number | boolean
            return typeof x === "boolean"
                ? x.toString() // boolean
                : x.toString(); // number
        })();
}
function foo4(x: number | string | boolean) {
    return typeof x === "string"
        ? x
        : ((a: number | boolean) => {
            var b = x; // new scope - number | boolean
            return typeof x === "boolean"
                ? x.toString() // boolean
                : x.toString(); // number
        })(x); // x here is narrowed to number | boolean
}
// Type guards affect nested function expressions, but not nested function declarations
function foo5(x: number | string | boolean) {
    if (typeof x === "string") {
        var y = x; // string;
        function foo() {
            var z = x; // number | string | boolean, type guard has no effect
        }
    }
}
module m {
    var x: number | string | boolean;
    module m2 {
        var b = x; // new scope - number | boolean | string
        var y: string;
        if (typeof x === "string") {
            y = x // string;
        } else {
            y = typeof x === "boolean"
            ? x.toString() // boolean
            : x.toString(); // number
        }
    }
}
module m1 {
    var x: number | string | boolean;
    module m2.m3 {
        var b = x; // new scope - number | boolean | string
        var y: string;
        if (typeof x === "string") {
            y = x // string;
        } else {
            y = typeof x === "boolean"
            ? x.toString() // boolean
            : x.toString(); // number
        }
    }
}

//// [typeGuardsInFunctionAndModuleBlock.js]
// typeguards are scoped in function/module block
function foo(x) {
    return typeof x === "string"
        ? x
        : function f() {
            var b = x; // number | boolean
            return typeof x === "boolean"
                ? x.toString() // boolean
                : x.toString(); // number
        }();
}
function foo2(x) {
    return typeof x === "string"
        ? x
        : function f(a) {
            var b = x; // new scope - number | boolean
            return typeof x === "boolean"
                ? x.toString() // boolean
                : x.toString(); // number
        }(x); // x here is narrowed to number | boolean
}
function foo3(x) {
    return typeof x === "string"
        ? x
        : (function () {
            var b = x; // new scope - number | boolean
            return typeof x === "boolean"
                ? x.toString() // boolean
                : x.toString(); // number
        })();
}
function foo4(x) {
    return typeof x === "string"
        ? x
        : (function (a) {
            var b = x; // new scope - number | boolean
            return typeof x === "boolean"
                ? x.toString() // boolean
                : x.toString(); // number
        })(x); // x here is narrowed to number | boolean
}
// Type guards affect nested function expressions, but not nested function declarations
function foo5(x) {
    if (typeof x === "string") {
        var y = x; // string;
        function foo() {
            var z = x; // number | string | boolean, type guard has no effect
        }
    }
}
var m;
(function (m) {
    var x;
    var m2;
    (function (m2) {
        var b = x; // new scope - number | boolean | string
        var y;
        if (typeof x === "string") {
            y = x; // string;
        }
        else {
            y = typeof x === "boolean"
                ? x.toString() // boolean
                : x.toString(); // number
        }
    })(m2 || (m2 = {}));
})(m || (m = {}));
var m1;
(function (m1) {
    var x;
    var m2;
    (function (m2) {
        var m3;
        (function (m3) {
            var b = x; // new scope - number | boolean | string
            var y;
            if (typeof x === "string") {
                y = x; // string;
            }
            else {
                y = typeof x === "boolean"
                    ? x.toString() // boolean
                    : x.toString(); // number
            }
        })(m3 = m2.m3 || (m2.m3 = {}));
    })(m2 || (m2 = {}));
})(m1 || (m1 = {}));