123 lines
2.8 KiB
TypeScript
123 lines
2.8 KiB
TypeScript
//// [truthinessCallExpressionCoercion1.ts]
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function onlyErrorsWhenTestingNonNullableFunctionType(required: () => boolean, optional?: () => boolean) {
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// error
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required ? console.log('required') : undefined;
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// ok
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optional ? console.log('optional') : undefined;
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// ok
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!!required ? console.log('not required') : undefined;
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// ok
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required() ? console.log('required call') : undefined;
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}
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function onlyErrorsWhenUnusedInBody() {
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function test() { return Math.random() > 0.5; }
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// error
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test ? console.log('test') : undefined;
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// ok
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test ? console.log(test) : undefined;
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// ok
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test ? test() : undefined;
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// ok
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test
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? [() => null].forEach(() => { test(); })
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: undefined;
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// error
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test
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? [() => null].forEach(test => { test() })
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: undefined;
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}
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function checksPropertyAccess() {
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const x = {
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foo: {
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bar() { return true; }
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}
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}
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// error
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x.foo.bar ? console.log('x.foo.bar') : undefined;
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// ok
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x.foo.bar ? x.foo.bar : undefined;
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}
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class Foo {
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maybeIsUser?: () => boolean;
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isUser() {
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return true;
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}
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test() {
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// error
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this.isUser ? console.log('this.isUser') : undefined;
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// ok
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this.maybeIsUser ? console.log('this.maybeIsUser') : undefined;
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}
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}
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//// [truthinessCallExpressionCoercion1.js]
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function onlyErrorsWhenTestingNonNullableFunctionType(required, optional) {
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// error
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required ? console.log('required') : undefined;
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// ok
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optional ? console.log('optional') : undefined;
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// ok
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!!required ? console.log('not required') : undefined;
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// ok
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required() ? console.log('required call') : undefined;
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}
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function onlyErrorsWhenUnusedInBody() {
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function test() { return Math.random() > 0.5; }
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// error
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test ? console.log('test') : undefined;
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// ok
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test ? console.log(test) : undefined;
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// ok
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test ? test() : undefined;
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// ok
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test
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? [function () { return null; }].forEach(function () { test(); })
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: undefined;
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// error
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test
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? [function () { return null; }].forEach(function (test) { test(); })
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: undefined;
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}
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function checksPropertyAccess() {
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var x = {
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foo: {
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bar: function () { return true; }
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}
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};
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// error
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x.foo.bar ? console.log('x.foo.bar') : undefined;
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// ok
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x.foo.bar ? x.foo.bar : undefined;
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}
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var Foo = /** @class */ (function () {
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function Foo() {
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}
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Foo.prototype.isUser = function () {
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return true;
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};
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Foo.prototype.test = function () {
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// error
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this.isUser ? console.log('this.isUser') : undefined;
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// ok
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this.maybeIsUser ? console.log('this.maybeIsUser') : undefined;
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};
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return Foo;
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}());
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