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// @strictNullChecks:true
function onlyErrorsWhenTestingNonNullableFunctionType(required: () => boolean, optional?: () => boolean) {
// error
required ? console.log('required') : undefined;
// ok
optional ? console.log('optional') : undefined;
// ok
!!required ? console.log('not required') : undefined;
// ok
required() ? console.log('required call') : undefined;
}
function onlyErrorsWhenUnusedInBody() {
function test() { return Math.random() > 0.5; }
// error
test ? console.log('test') : undefined;
// ok
test ? console.log(test) : undefined;
// ok
test ? test() : undefined;
// ok
test
? [() => null].forEach(() => { test(); })
: undefined;
// error
test
? [() => null].forEach(test => { test() })
: undefined;
}
function checksPropertyAccess() {
const x = {
foo: {
bar() { return true; }
}
}
// error
x.foo.bar ? console.log('x.foo.bar') : undefined;
// ok
x.foo.bar ? x.foo.bar : undefined;
}
class Foo {
maybeIsUser?: () => boolean;
isUser() {
return true;
}
test() {
// error
this.isUser ? console.log('this.isUser') : undefined;
// ok
this.maybeIsUser ? console.log('this.maybeIsUser') : undefined;
// ok
if (this.isUser) {
this.isUser();
}
}
}
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