test babel plugin on ci #855

Job	Run time
list-branches	9s
Build for iterator-chunking-stage-2-7	6s
Build for data-view-clamped-stage-2	5s
Build for proposals-types	8s
Build for master	6s
Build for v3	16s
Build for v3.45-docs	8s
Build for web	8s
Build for v4	35s
combine-pages-and-deploy	15s
	1m 56s

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