fix esm import.default #109

Job	Run time
build (16.x, ubuntu-20.04)	1m 34s
build (16.x, ubuntu-latest)	1m 4s
build (16.x, macos-latest)	2m 14s
build (16.x, windows-latest)	2m 57s
build (18.x, ubuntu-20.04)	1m 12s
build (18.x, ubuntu-latest)	1m 5s
build (18.x, macos-latest)	2m 20s
build (18.x, windows-latest)	2m 42s
build-legacy (14.x, ubuntu-20.04)	1m 47s
build-legacy (14.x, ubuntu-latest)	1m 15s
build-legacy (14.x, macos-latest)	2m 41s
build-legacy (14.x, windows-latest)	2m 35s
build-new (19.x, ubuntu-20.04)	10s
build-new (19.x, ubuntu-latest)	11s
build-new (19.x, macos-latest)	11s
build-new (19.x, windows-latest)	13s
build-new (20.x, ubuntu-20.04)	27s
build-new (20.x, ubuntu-latest)	26s
build-new (20.x, macos-latest)	12s
build-new (20.x, windows-latest)	13s
	25m 29s

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