//// [typeGuardOfFormTypeOfBoolean.ts] class C { private p: string }; var str: string; var bool: boolean; var num: number; var strOrNum: string | number; var strOrBool: string | boolean; var numOrBool: number | boolean var strOrNumOrBool: string | number | boolean; var strOrC: string | C; var numOrC: number | C; var boolOrC: boolean | C; var c: C; // A type guard of the form typeof x === s, // where s is a string literal with the value 'string', 'number', or 'boolean', // - when true, narrows the type of x to the given primitive type, or // - when false, removes the primitive type from the type of x. if (typeof strOrBool === "boolean") { bool = strOrBool; // boolean } else { str = strOrBool; // string } if (typeof numOrBool === "boolean") { bool = numOrBool; // boolean } else { num = numOrBool; // number } if (typeof strOrNumOrBool === "boolean") { bool = strOrNumOrBool; // boolean } else { strOrNum = strOrNumOrBool; // string | number } if (typeof boolOrC === "boolean") { bool = boolOrC; // boolean } else { c = boolOrC; // C } // Narrowing occurs only if target type is a subtype of variable type if (typeof strOrNum === "boolean") { var z1: string | number = strOrNum; // string | number } else { var z2: string | number = strOrNum; // string | number } // A type guard of the form typeof x !== s, where s is a string literal, // - when true, narrows the type of x by typeof x === s when false, or // - when false, narrows the type of x by typeof x === s when true. if (typeof strOrBool !== "boolean") { str = strOrBool; // string } else { bool = strOrBool; // boolean } if (typeof numOrBool !== "boolean") { num = numOrBool; // number } else { bool = numOrBool; // boolean } if (typeof strOrNumOrBool !== "boolean") { strOrNum = strOrNumOrBool; // string | number } else { bool = strOrNumOrBool; // boolean } if (typeof boolOrC !== "boolean") { c = boolOrC; // C } else { bool = boolOrC; // boolean } // Narrowing occurs only if target type is a subtype of variable type if (typeof strOrNum !== "boolean") { var z1: string | number = strOrNum; // string | number } else { var z2: string | number = strOrNum; // string | number } //// [typeGuardOfFormTypeOfBoolean.js] var C = (function () { function C() { } return C; })(); ; var str; var bool; var num; var strOrNum; var strOrBool; var numOrBool; var strOrNumOrBool; var strOrC; var numOrC; var boolOrC; var c; // A type guard of the form typeof x === s, // where s is a string literal with the value 'string', 'number', or 'boolean', // - when true, narrows the type of x to the given primitive type, or // - when false, removes the primitive type from the type of x. if (typeof strOrBool === "boolean") { bool = strOrBool; // boolean } else { str = strOrBool; // string } if (typeof numOrBool === "boolean") { bool = numOrBool; // boolean } else { num = numOrBool; // number } if (typeof strOrNumOrBool === "boolean") { bool = strOrNumOrBool; // boolean } else { strOrNum = strOrNumOrBool; // string | number } if (typeof boolOrC === "boolean") { bool = boolOrC; // boolean } else { c = boolOrC; // C } // Narrowing occurs only if target type is a subtype of variable type if (typeof strOrNum === "boolean") { var z1 = strOrNum; // string | number } else { var z2 = strOrNum; // string | number } // A type guard of the form typeof x !== s, where s is a string literal, // - when true, narrows the type of x by typeof x === s when false, or // - when false, narrows the type of x by typeof x === s when true. if (typeof strOrBool !== "boolean") { str = strOrBool; // string } else { bool = strOrBool; // boolean } if (typeof numOrBool !== "boolean") { num = numOrBool; // number } else { bool = numOrBool; // boolean } if (typeof strOrNumOrBool !== "boolean") { strOrNum = strOrNumOrBool; // string | number } else { bool = strOrNumOrBool; // boolean } if (typeof boolOrC !== "boolean") { c = boolOrC; // C } else { bool = boolOrC; // boolean } // Narrowing occurs only if target type is a subtype of variable type if (typeof strOrNum !== "boolean") { var z1 = strOrNum; // string | number } else { var z2 = strOrNum; // string | number }