{"id":205,"date":"2026-07-14T09:26:29","date_gmt":"2026-07-14T01:26:29","guid":{"rendered":"https:\/\/yykcj.com\/?p=205"},"modified":"2026-07-14T09:26:29","modified_gmt":"2026-07-14T01:26:29","slug":"typescript-5-x-%e8%bf%9b%e9%98%b6%e7%94%a8%e6%b3%95%ef%bc%9a%e8%a3%85%e9%a5%b0%e5%99%a8%e3%80%81%e6%9d%a1%e4%bb%b6%e7%b1%bb%e5%9e%8b%e4%b8%8e%e6%80%a7%e8%83%bd%e4%bc%98%e5%8c%96%e5%ae%9e%e6%88%98","status":"publish","type":"post","link":"https:\/\/yykcj.com\/?p=205","title":{"rendered":"TypeScript 5.x \u8fdb\u9636\u7528\u6cd5\uff1a\u88c5\u9970\u5668\u3001\u6761\u4ef6\u7c7b\u578b\u4e0e\u6027\u80fd\u4f18\u5316\u5b9e\u6218"},"content":{"rendered":"

\u5f15\u8a00<\/h2>\n

TypeScript 5.x \u5e26\u6765\u4e86\u8bb8\u591a\u6fc0\u52a8\u4eba\u5fc3\u7684\u65b0\u7279\u6027\uff0c\u5c24\u5176\u662f\u88c5\u9970\u5668\u7684\u6807\u51c6\u5316\u3001\u6761\u4ef6\u7c7b\u578b\u7684\u589e\u5f3a\u4ee5\u53ca\u7c7b\u578b\u7cfb\u7edf\u6027\u80fd\u7684\u663e\u8457\u63d0\u5347\u3002\u7136\u800c\uff0c\u8bb8\u591a\u5f00\u53d1\u8005\u4ecd\u505c\u7559\u5728\u57fa\u7840\u7528\u6cd5\u4e0a\uff0c\u672a\u80fd\u5145\u5206\u5229\u7528\u8fd9\u4e9b\u7279\u6027\u6765\u63d0\u5347\u4ee3\u7801\u8d28\u91cf\u3002\u672c\u6587\u5c06\u5e26\u4f60\u6df1\u5165\u5b9e\u8df5\uff0c\u638c\u63e1 TypeScript 5.x \u7684\u8fdb\u9636\u7528\u6cd5\uff0c\u5305\u62ec\u88c5\u9970\u5668\u3001\u6761\u4ef6\u7c7b\u578b\u4ee5\u53ca\u6027\u80fd\u4f18\u5316\u6280\u5de7\u3002<\/p>\n

\u4e00\u3001\u88c5\u9970\u5668\uff1a\u4ece\u5b9e\u9a8c\u5230\u6807\u51c6<\/h2>\n

TypeScript 5.x \u6b63\u5f0f\u5b9e\u73b0\u4e86 Stage 3 \u88c5\u9970\u5668\u63d0\u6848\uff0c\u4e0e\u4e4b\u524d\u7684\u5b9e\u9a8c\u6027\u88c5\u9970\u5668\u6709\u663e\u8457\u5dee\u5f02\u3002\u65b0\u88c5\u9970\u5668\u66f4\u7b80\u6d01\u3001\u7c7b\u578b\u5b89\u5168\uff0c\u5e76\u4e14\u4e0e JavaScript \u6807\u51c6\u5bf9\u9f50\u3002<\/p>\n

1.1 \u542f\u7528\u65b0\u88c5\u9970\u5668<\/h3>\n

\u5728 tsconfig.json<\/code> \u4e2d\u8bbe\u7f6e\uff1a<\/p>\n

\n{\n    "compilerOptions": {\n        "target": "ES2022",\n        "experimentalDecorators": false \/\/ \u5173\u95ed\u65e7\u88c5\u9970\u5668\n    }\n}\n<\/code><\/pre>\n
1.2 \u57fa\u672c\u7528\u6cd5<\/h3>\n
\u65b0\u88c5\u9970\u5668\u51fd\u6570\u63a5\u6536\u4e24\u4e2a\u53c2\u6570\uff1atarget<\/code>\uff08\u88ab\u88c5\u9970\u7684\u5143\u7d20\uff09\u548c context<\/code>\uff08\u5305\u542b\u5143\u6570\u636e\u7684\u5bf9\u8c61\uff09\u3002<\/p>\n
\nfunction logged<T extends (...args: any[]) => any>(\n    target: T,\n    context: ClassMethodDecoratorContext\n) {\n    return function (this: any, ...args: Parameters<T>) {\n        console.log(`Calling ${String(context.name)} with`, args);\n        return target.call(this, ...args);\n    };\n}\n\nclass Calculator {\n    @logged\n    add(a: number, b: number): number {\n        return a + b;\n    }\n}\n\nconst calc = new Calculator();\ncalc.add(2, 3); \/\/ \u8f93\u51fa\u65e5\u5fd7\n<\/code><\/pre>\n
\ud83d\udca1 \u6ce8\u610f<\/strong>\uff1a\u65b0\u88c5\u9970\u5668\u4e0d\u80fd\u7528\u4e8e\u53c2\u6570\u88c5\u9970\u5668\uff1b\u5982\u679c\u9700\u8981\u53c2\u6570\u88c5\u9970\u5668\uff0c\u4ecd\u9700\u4f7f\u7528\u65e7\u88c5\u9970\u5668\uff08experimentalDecorators: true<\/code>\uff09\uff0c\u4f46\u4e24\u8005\u4e0d\u53ef\u6df7\u7528\u3002<\/p>\n
1.3 \u81ea\u5b9a\u4e49\u88c5\u9970\u5668\u5de5\u5382<\/h3>\n
\u88c5\u9970\u5668\u5de5\u5382\u8fd4\u56de\u4e00\u4e2a\u88c5\u9970\u5668\u51fd\u6570\uff0c\u53ef\u4ee5\u63a5\u53d7\u53c2\u6570\uff1a<\/p>\n
\nfunction validate(min: number, max: number) {\n    return function (\n        target: any,\n        context: ClassAccessorDecoratorContext\n    ) {\n        return {\n            get(this: any) {\n                return target.get.call(this);\n            },\n            set(this: any, value: number) {\n                if (value < min || value > max) {\n                    throw new Error(`Value must be between ${min} and ${max}`);\n                }\n                target.set.call(this, value);\n            }\n        };\n    };\n}\n\nclass Temperature {\n    @validate(0, 100)\n    accessor celsius: number = 0;\n}\n\nconst temp = new Temperature();\ntemp.celsius = 50; \/\/ \u6b63\u5e38\ntemp.celsius = 150; \/\/ \u629b\u51fa\u9519\u8bef\n<\/code><\/pre>\n
\u4e8c\u3001\u6761\u4ef6\u7c7b\u578b\uff1a\u4ece\u57fa\u7840\u5230\u9ad8\u7ea7\u6a21\u5f0f<\/h2>\n
\u6761\u4ef6\u7c7b\u578b\u8ba9\u7c7b\u578b\u8ba1\u7b97\u53d8\u5f97\u7075\u6d3b\uff0cTypeScript 5.x \u8fdb\u4e00\u6b65\u589e\u5f3a\u4e86\u5176\u80fd\u529b\u3002<\/p>\n
2.1 \u5206\u5e03\u5f0f\u6761\u4ef6\u7c7b\u578b<\/h3>\n
\u5f53\u6761\u4ef6\u7c7b\u578b\u7528\u4e8e\u6cdb\u578b\u4e14\u6cdb\u578b\u4e3a\u8054\u5408\u7c7b\u578b\u65f6\uff0c\u4f1a\u81ea\u52a8\u5206\u5e03\u5f0f\u6c42\u503c\uff1a<\/p>\n
\ntype ToArray<T> = T extends unknown ? T[] : never;\ntype Result = ToArray<string | number>; \/\/ string[] | number[]\n<\/code><\/pre>\n
2.2 \u6a21\u677f\u5b57\u9762\u91cf\u7c7b\u578b\u4e0e\u6761\u4ef6\u7c7b\u578b\u7ed3\u5408<\/h3>\n
\ntype EventName<T extends string> = `${T}Changed`;\ntype Handler<T extends string> = (event: EventName<T>) => void;\n\nfunction createListener<T extends string>(event: T, handler: Handler<T>) {}\n\ncreateListener('name', (event) => {\n    \/\/ event \u7c7b\u578b\u4e3a "nameChanged"\n});\n<\/code><\/pre>\n
2.3 infer \u5173\u952e\u5b57\u7684\u9ad8\u7ea7\u7528\u6cd5<\/h3>\n
infer<\/code> \u7528\u4e8e\u5728\u6761\u4ef6\u7c7b\u578b\u4e2d\u63a8\u65ad\u7c7b\u578b\u53d8\u91cf\uff1a<\/p>\n
\ntype ReturnTypeOf<T> = T extends (...args: any[]) => infer R ? R : never;\n\nfunction greet() { return 'hello'; }\ntype GreetReturn = ReturnTypeOf<typeof greet>; \/\/ string\n<\/code><\/pre>\n
\u66f4\u590d\u6742\u7684\u4f8b\u5b50\uff1a\u63d0\u53d6 Promise \u7684\u8fd4\u56de\u503c\u7c7b\u578b\uff1a<\/p>\n
\ntype Unwrap<T> = T extends Promise<infer U> ? Unwrap<U> : T;\ntype Result = Unwrap<Promise<Promise<string>>>; \/\/ string\n<\/code><\/pre>\n
\ud83d\udca1 \u6ce8\u610f<\/strong>\uff1ainfer<\/code> \u53ea\u80fd\u5728\u6761\u4ef6\u7c7b\u578b\u7684 extends<\/code> \u5b50\u53e5\u4e2d\u4f7f\u7528\u3002<\/p>\n
\u4e09\u3001\u6027\u80fd\u4f18\u5316\uff1a\u8ba9\u7c7b\u578b\u68c0\u67e5\u98de\u8d77\u6765<\/h2>\n
TypeScript 5.x \u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u63d0\u5347\u4e86\u7c7b\u578b\u68c0\u67e5\u6027\u80fd\u3002<\/p>\n
3.1 \u4f7f\u7528 --isolatedModules<\/code> \u548c --verbatimModuleSyntax<\/code><\/h3>\n
\u8fd9\u4e24\u4e2a\u9009\u9879\u53ef\u4ee5\u663e\u8457\u51cf\u5c11\u7f16\u8bd1\u65f6\u7684\u7c7b\u578b\u68c0\u67e5\u5de5\u4f5c\uff1a<\/p>\n
\n{\n    "compilerOptions": {\n        "isolatedModules": true,\n        "verbatimModuleSyntax": true\n    }\n}\n<\/code><\/pre>\n