导读 | TypeScript 5.1 发布了首个 Beta 测试版。 |
主要变化
旧代码
function foo() { // no return } // x = undefined let x = foo();
// fine - we inferred that 'f1' returns 'void' function f1() { // no returns } // fine - 'void' doesn't need a return statement function f2(): void { // no returns } // fine - 'any' doesn't need a return statement function f3(): any { // no returns } // error! // A function whose declared type is neither 'void' nor 'any' must return a value. function f4(): undefined { // no returns }
新代码
// Works in TypeScript 5.1! function f4(): undefined { // no returns } // Works in TypeScript 5.1! takesFunction((): undefined => { // no returns });
// Works in TypeScript 5.1! takesFunction(function f() { // ^ return type is undefined // no returns }); // Works in TypeScript 5.1! takesFunction(function f() { // ^ return type is undefined return; });
原文来自:https://www.oschina.net/news/237457/typescript-5-1-beta
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