57 lines
1.9 KiB
JavaScript
57 lines
1.9 KiB
JavaScript
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//// [typeGuardsInProperties.ts]
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// Note that type guards affect types of variables and parameters only and
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// have no effect on members of objects such as properties.
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var num: number;
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var strOrNum: string | number;
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class C1 {
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private pp1: string | number;
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pp2: string | number;
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// Inside public accessor getter
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get pp3() {
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return strOrNum;
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}
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method() {
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strOrNum = typeof this.pp1 === "string" && this.pp1; // string | number
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strOrNum = typeof this.pp2 === "string" && this.pp2; // string | number
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strOrNum = typeof this.pp3 === "string" && this.pp3; // string | number
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}
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}
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var c1: C1;
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strOrNum = typeof c1.pp2 === "string" && c1.pp2; // string | number
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strOrNum = typeof c1.pp3 === "string" && c1.pp3; // string | number
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var obj1: {
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x: string | number;
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};
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strOrNum = typeof obj1.x === "string" && obj1.x; // string | number
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//// [typeGuardsInProperties.js]
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// Note that type guards affect types of variables and parameters only and
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// have no effect on members of objects such as properties.
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var num;
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var strOrNum;
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var C1 = (function () {
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function C1() {
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}
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Object.defineProperty(C1.prototype, "pp3", {
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// Inside public accessor getter
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get: function () {
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return strOrNum;
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},
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enumerable: true,
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configurable: true
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});
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C1.prototype.method = function () {
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strOrNum = typeof this.pp1 === "string" && this.pp1; // string | number
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strOrNum = typeof this.pp2 === "string" && this.pp2; // string | number
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strOrNum = typeof this.pp3 === "string" && this.pp3; // string | number
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};
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return C1;
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})();
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var c1;
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strOrNum = typeof c1.pp2 === "string" && c1.pp2; // string | number
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strOrNum = typeof c1.pp3 === "string" && c1.pp3; // string | number
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var obj1;
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strOrNum = typeof obj1.x === "string" && obj1.x; // string | number
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