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doc/release-notes/TypeScript 2.1.md
@@ -208,6 +208,8 @@ var Derived = (function (_super) {
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}(Base));
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```
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+> 这在继承内置类如`Error`,`Array`,`Map`等的行为上有了破坏性的改变。请阅读[extending built-ins breaking change documnetation](https://github.com/Microsoft/TypeScript-wiki/blob/master/Breaking-Changes.md#extending-built-ins-like-error-array-and-map-may-no-longer-work)。
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## 配置继承
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通常一个项目有多个输出版本,比如`ES5`和`ES2015`,调试和生产或`Commonjs`和`System`。只有几个配置选项在这两个版本之间改变,并且维护多个`tsconfig.json`文件是麻烦的。
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