58 lines
1.4 KiB
TypeScript
58 lines
1.4 KiB
TypeScript
//// [widenedTypes.ts]
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null instanceof (() => { });
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({}) instanceof null; // Ok because null is a subtype of function
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null in {};
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"" in null;
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for (var a in null) { }
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var t = [3, (3, null)];
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t[3] = "";
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var x: typeof undefined = 3;
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x = 3;
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var y;
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var u = [3, (y = null)];
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u[3] = "";
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var ob: { x: typeof undefined } = { x: "" };
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// Highlights the difference between array literals and object literals
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var arr: string[] = [3, null]; // not assignable because null is not widened. BCT is {}
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var obj: { [x: string]: string; } = { x: 3, y: null }; // assignable because null is widened, and therefore BCT is any
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//// [widenedTypes.js]
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null instanceof (function () { });
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({}) instanceof null; // Ok because null is a subtype of function
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null in {};
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"" in null;
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for (var a in null) { }
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var t = [3, (3, null)];
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t[3] = "";
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var x = 3;
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x = 3;
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var y;
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var u = [3, (y = null)];
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u[3] = "";
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var ob = { x: "" };
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// Highlights the difference between array literals and object literals
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var arr = [3, null]; // not assignable because null is not widened. BCT is {}
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var obj = { x: 3, y: null }; // assignable because null is widened, and therefore BCT is any
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//// [widenedTypes.d.ts]
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declare var t: number[];
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declare var x: typeof undefined;
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declare var y: any;
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declare var u: number[];
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declare var ob: {
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x: typeof undefined;
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};
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declare var arr: string[];
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declare var obj: {
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[x: string]: string;
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};
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