59 lines
922 B
TypeScript
59 lines
922 B
TypeScript
// @strictNullChecks: true
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// @declaration: true
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interface Foo {
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a: number;
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b?: number;
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f(): number;
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g?(): number;
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}
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function test1(x: Foo) {
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x.a;
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x.b;
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x.f;
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x.g;
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let f1 = x.f();
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let g1 = x.g && x.g();
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let g2 = x.g ? x.g() : 0;
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}
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class Bar {
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a: number;
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b?: number;
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c? = 2;
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constructor(public d?: number, public e = 10) {}
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f() {
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return 1;
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}
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g?(): number; // Body of optional method can be omitted
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h?() {
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return 2;
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}
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}
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function test2(x: Bar) {
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x.a;
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x.b;
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x.c;
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x.d;
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x.e;
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x.f;
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x.g;
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let f1 = x.f();
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let g1 = x.g && x.g();
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let g2 = x.g ? x.g() : 0;
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let h1 = x.h && x.h();
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let h2 = x.h ? x.h() : 0;
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}
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class Base {
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a?: number;
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f?(): number;
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}
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class Derived extends Base {
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a = 1;
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f(): number { return 1; }
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}
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