ember cli build slow with babel includePolyfill

Question

why is babel so slow with includePolyfill: true

I have latest version of "ember-cli": "2.3.0" and "ember-cli-babel": "^5.1.5"

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

without 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)

Was the includePolyfill build the first build in the directory? What do the build times look like if you try turning includePolyfill: flase, delete the tmp and dist folders, and then rebuild? — Justin Niessner
– Justin Niessner, Commented Feb 19, 2016 at 21:40
if I use app.import('vendor/polyfill.min.js'); then everything is ok, if I use includePolyfill: true then all is awfully slow and node.js consumes lot of cpu — AHOYAHOY
– AHOYAHOY, Commented Feb 21, 2016 at 19:15

morhook · Accepted Answer · 2016-10-12 20:44:34Z

1

Babel is slower with 'includePolyfill' because it has to process the JS more than what it usually does!

answered Oct 12, 2016 at 20:44

morhook

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