79 lines
1.8 KiB
TypeScript
79 lines
1.8 KiB
TypeScript
// @allowJS: true
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// @suppressOutputPathCheck: true
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// @strictNullChecks: true
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// @filename: a.ts
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var W: string;
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// @filename: b.js
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// @ts-check
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var W = /** @type {string} */(/** @type {*} */ (4));
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var W = /** @type {string} */(4); // Error
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/** @type {*} */
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var a;
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/** @type {string} */
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var s;
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var a = /** @type {*} */("" + 4);
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var s = "" + /** @type {*} */(4);
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class SomeBase {
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constructor() {
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this.p = 42;
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}
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}
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class SomeDerived extends SomeBase {
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constructor() {
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super();
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this.x = 42;
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}
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}
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class SomeOther {
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constructor() {
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this.q = 42;
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}
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}
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function SomeFakeClass() {
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/** @type {string|number} */
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this.p = "bar";
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}
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// Type assertion should check for assignability in either direction
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var someBase = new SomeBase();
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var someDerived = new SomeDerived();
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var someOther = new SomeOther();
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var someFakeClass = new SomeFakeClass();
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someBase = /** @type {SomeBase} */(someDerived);
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someBase = /** @type {SomeBase} */(someBase);
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someBase = /** @type {SomeBase} */(someOther); // Error
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someDerived = /** @type {SomeDerived} */(someDerived);
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someDerived = /** @type {SomeDerived} */(someBase);
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someDerived = /** @type {SomeDerived} */(someOther); // Error
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someOther = /** @type {SomeOther} */(someDerived); // Error
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someOther = /** @type {SomeOther} */(someBase); // Error
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someOther = /** @type {SomeOther} */(someOther);
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someFakeClass = someBase;
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someFakeClass = someDerived;
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someBase = someFakeClass; // Error
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someBase = /** @type {SomeBase} */(someFakeClass);
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// Type assertion cannot be a type-predicate type
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/** @type {number | string} */
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var numOrStr;
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/** @type {string} */
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var str;
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if(/** @type {numOrStr is string} */(numOrStr === undefined)) { // Error
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str = numOrStr; // Error, no narrowing occurred
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}
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