fix: switch interface method decl style #94

Job	Run time
js-test-and-release / check	1m 26s
js-test-and-release / test-node (windows-latest, lts/*)	2m 16s
js-test-and-release / test-node (ubuntu-latest, lts/*)	35s
js-test-and-release / test-chrome	44s
js-test-and-release / test-node (macos-latest, lts/*)	1m 40s
js-test-and-release / test-chrome-webworker	49s
js-test-and-release / test-firefox	45s
js-test-and-release / test-electron-main	37s
js-test-and-release / test-webkit (ubuntu-latest, lts/*)	16s
js-test-and-release / test-firefox-webworker	51s
js-test-and-release / test-webkit-webworker (ubuntu-latest, lts/*)	27s
js-test-and-release / test-webkit (macos-latest, lts/*)	1m 59s
js-test-and-release / test-webkit-webworker (macos-latest, lts/*)	1m 32s
js-test-and-release / test-electron-renderer	19s
js-test-and-release / release-check	2s
js-test-and-release / release	41s
	14m 59s

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