=== tests/cases/conformance/expressions/typeGuards/typeGuardOfFormTypeOfBoolean.ts === class C { private p: string }; >C : C >p : string var str: string; >str : string var bool: boolean; >bool : boolean var num: number; >num : number var strOrNum: string | number; >strOrNum : string | number var strOrBool: string | boolean; >strOrBool : string | boolean var numOrBool: number | boolean >numOrBool : number | boolean var strOrNumOrBool: string | number | boolean; >strOrNumOrBool : string | number | boolean var strOrC: string | C; >strOrC : string | C >C : C var numOrC: number | C; >numOrC : number | C >C : C var boolOrC: boolean | C; >boolOrC : boolean | C >C : C var c: C; >c : C >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") { >typeof strOrBool === "boolean" : boolean >typeof strOrBool : string >strOrBool : string | boolean >"boolean" : string bool = strOrBool; // boolean >bool = strOrBool : boolean >bool : boolean >strOrBool : boolean } else { str = strOrBool; // string >str = strOrBool : string >str : string >strOrBool : string } if (typeof numOrBool === "boolean") { >typeof numOrBool === "boolean" : boolean >typeof numOrBool : string >numOrBool : number | boolean >"boolean" : string bool = numOrBool; // boolean >bool = numOrBool : boolean >bool : boolean >numOrBool : boolean } else { num = numOrBool; // number >num = numOrBool : number >num : number >numOrBool : number } if (typeof strOrNumOrBool === "boolean") { >typeof strOrNumOrBool === "boolean" : boolean >typeof strOrNumOrBool : string >strOrNumOrBool : string | number | boolean >"boolean" : string bool = strOrNumOrBool; // boolean >bool = strOrNumOrBool : boolean >bool : boolean >strOrNumOrBool : boolean } else { strOrNum = strOrNumOrBool; // string | number >strOrNum = strOrNumOrBool : string | number >strOrNum : string | number >strOrNumOrBool : string | number } if (typeof boolOrC === "boolean") { >typeof boolOrC === "boolean" : boolean >typeof boolOrC : string >boolOrC : boolean | C >"boolean" : string bool = boolOrC; // boolean >bool = boolOrC : boolean >bool : boolean >boolOrC : boolean } else { c = boolOrC; // C >c = boolOrC : C >c : C >boolOrC : C } // Narrowing occurs only if target type is a subtype of variable type if (typeof strOrNum === "boolean") { >typeof strOrNum === "boolean" : boolean >typeof strOrNum : string >strOrNum : string | number >"boolean" : string var z1: string | number = strOrNum; // string | number >z1 : string | number >strOrNum : string | number } else { var z2: string | number = strOrNum; // string | number >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") { >typeof strOrBool !== "boolean" : boolean >typeof strOrBool : string >strOrBool : string | boolean >"boolean" : string str = strOrBool; // string >str = strOrBool : string >str : string >strOrBool : string } else { bool = strOrBool; // boolean >bool = strOrBool : boolean >bool : boolean >strOrBool : boolean } if (typeof numOrBool !== "boolean") { >typeof numOrBool !== "boolean" : boolean >typeof numOrBool : string >numOrBool : number | boolean >"boolean" : string num = numOrBool; // number >num = numOrBool : number >num : number >numOrBool : number } else { bool = numOrBool; // boolean >bool = numOrBool : boolean >bool : boolean >numOrBool : boolean } if (typeof strOrNumOrBool !== "boolean") { >typeof strOrNumOrBool !== "boolean" : boolean >typeof strOrNumOrBool : string >strOrNumOrBool : string | number | boolean >"boolean" : string strOrNum = strOrNumOrBool; // string | number >strOrNum = strOrNumOrBool : string | number >strOrNum : string | number >strOrNumOrBool : string | number } else { bool = strOrNumOrBool; // boolean >bool = strOrNumOrBool : boolean >bool : boolean >strOrNumOrBool : boolean } if (typeof boolOrC !== "boolean") { >typeof boolOrC !== "boolean" : boolean >typeof boolOrC : string >boolOrC : boolean | C >"boolean" : string c = boolOrC; // C >c = boolOrC : C >c : C >boolOrC : C } else { bool = boolOrC; // boolean >bool = boolOrC : boolean >bool : boolean >boolOrC : boolean } // Narrowing occurs only if target type is a subtype of variable type if (typeof strOrNum !== "boolean") { >typeof strOrNum !== "boolean" : boolean >typeof strOrNum : string >strOrNum : string | number >"boolean" : string var z1: string | number = strOrNum; // string | number >z1 : string | number >strOrNum : string | number } else { var z2: string | number = strOrNum; // string | number >z2 : string | number >strOrNum : string | number }