Question

我编写了一个NPM模块，用于我的SharePoint Framework webpart，使用reflect-metadata

import "reflect-metadata";

export function someDecorator(name: string): ClassDecorator {
    return target => {
        Reflect.defineMetadata("MyDecorator", name, target);
    }
}

直到昨天，我的spfx应用程序突然开始失败，这几天正常使用：

NonErrorEmittedError: (Emitted value instead of an instance of Error) Cannot find source file 'Reflect.ts': Error: Can't resolve './Reflect.ts' in '/mnt/tmp/my-webpart/node_modules/reflect-metadata'
    at emitWarning (/mnt/tmp/my-webpart/node_modules/webpack/lib/NormalModule.js:117:16)
    at /mnt/tmp/my-webpart/node_modules/source-map-loader/index.js:64:7
    at onError (/mnt/tmp/my-webpart/node_modules/enhanced-resolve/lib/Resolver.js:65:10)
    at loggingCallbackWrapper (/mnt/tmp/my-webpart/node_modules/enhanced-resolve/lib/createInnerCallback.js:31:19)
    at runAfter (/mnt/tmp/my-webpart/node_modules/enhanced-resolve/lib/Resolver.js:158:4)
    at innerCallback (/mnt/tmp/my-webpart/node_modules/enhanced-resolve/lib/Resolver.js:146:3)
    at loggingCallbackWrapper (/mnt/tmp/my-webpart/node_modules/enhanced-resolve/lib/createInnerCallback.js:31:19)
    at next (/mnt/tmp/my-webpart/node_modules/tapable/lib/Tapable.js:252:11)
    at /mnt/tmp/my-webpart/node_modules/enhanced-resolve/lib/UnsafeCachePlugin.js:40:4
    at loggingCallbackWrapper (/mnt/tmp/my-webpart/node_modules/enhanced-resolve/lib/createInnerCallback.js:31:19)
    at runAfter (/mnt/tmp/my-webpart/node_modules/enhanced-resolve/lib/Resolver.js:158:4)
    at innerCallback (/mnt/tmp/my-webpart/node_modules/enhanced-resolve/lib/Resolver.js:146:3)
    at loggingCallbackWrapper (/mnt/tmp/my-webpart/node_modules/enhanced-resolve/lib/createInnerCallback.js:31:19)
    at next (/mnt/tmp/my-webpart/node_modules/tapable/lib/Tapable.js:252:11)
    at innerCallback (/mnt/tmp/my-webpart/node_modules/enhanced-resolve/lib/Resolver.js:144:11)
    at loggingCallbackWrapper (/mnt/tmp/my-webpart/node_modules/enhanced-resolve/lib/createInnerCallback.js:31:19)

构建两天前工作正常的完全相同的代码。

那么是什么导致这个？为什么它突然寻找不存在的Reflect.ts文件？而且，最重要的是，我怎样才能让它再次运作？

Answer 1

如果您将Reflect.ts手动添加到/node_modules/reflect-metadata，则构建应会成功。

请参见issue#95和pr#89

我选择将Reflect.ts复制到我的源代码中，然后导入此本地文件而不是"reflect-metadata"。

注意此解决方案：

tslint警告，所以我在文件顶部添加了/* tslint:disable */。
ts错误在文件“类型'symbol'不能用作索引类型”中。由于TS版本spfx使用vs版本反射元数据使用。我用map[key]取代了map[key as string | number]，以消除错误。

或者，您可以派生反射元数据并发布包含Reflect.ts的更新的npm模块。

在Sharepoint Framework中反映元数据突然中断

1 个答案: