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omochimetaru 6/5/2017 3:26 PM
Prototypeにメソッド注入すれば一応できますよ
3:28 PM
例 https://github.com/ReactiveX/rxjs/blob/7b23e88db21302a10c2a163952b8da197d18cbfe/src/add/observable/concat.ts#L4
ReactiveX/rxjs
rxjs - A reactive programming library for JavaScript
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