使用babel includePolyfill构建缓慢的ember cli

Question

为什么babel这么慢includePolyfill: true

我有最新版本的 ＆＃34; ember-cli＆＃34;：＆＃34; 2.3.0＆＃34; 和 ＆＃34; ember-cli-babel＆＃34;：＆＃34; ^ 5.1.5＆＃34;

Build successful - 126129ms.

Slowest Trees                                 | Total
----------------------------------------------+---------------------
Babel                                         | 38205ms
JSHint app- QUnit                             | 36606ms
Babel                                         | 29282ms

Slowest Trees (cumulative)                    | Total (avg)
----------------------------------------------+---------------------
Babel (14)                                    | 77556ms (5539 ms)
JSHint app- QUnit (1)                         | 36606ms

没有polyfill

Build successful - 6896ms.

Slowest Trees                                 | Total
----------------------------------------------+---------------------
Babel                                         | 452ms

Slowest Trees (cumulative)                    | Total (avg)
----------------------------------------------+---------------------
Babel (14)                                    | 1797ms (128 ms)
Funnel: Addon JS (9)                          | 555ms (61 ms)

Answer 1

使用'includePolyfill'时Babel速度较慢，因为它必须比通常更多地处理JS！