refactor: prefer interfaces

[dai-shi]

following pmndrs/jotai#1234

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Size Change: 0 B

Total Size: 29.8 kB

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Filename	Size
dist/context.js	518 B
dist/esm/context.js	448 B
dist/esm/index.js	400 B
dist/esm/middleware.js	3.09 kB
dist/esm/middleware/immer.js	210 B
dist/esm/shallow.js	272 B
dist/esm/vanilla.js	377 B
dist/index.js	642 B
dist/middleware.js	3.22 kB
dist/middleware/immer.js	373 B
dist/shallow.js	318 B
dist/system/context.development.js	572 B
dist/system/context.production.js	393 B
dist/system/index.development.js	575 B
dist/system/index.production.js	386 B
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dist/system/middleware.production.js	2.04 kB
dist/system/middleware/immer.development.js	292 B
dist/system/middleware/immer.production.js	187 B
dist/system/shallow.development.js	338 B
dist/system/shallow.production.js	253 B
dist/system/vanilla.development.js	444 B
dist/system/vanilla.production.js	270 B
dist/umd/context.development.js	662 B
dist/umd/context.production.js	488 B
dist/umd/index.development.js	787 B
dist/umd/index.production.js	564 B
dist/umd/middleware.development.js	3.33 kB
dist/umd/middleware.production.js	2.05 kB
dist/umd/middleware/immer.development.js	514 B
dist/umd/middleware/immer.production.js	371 B
dist/umd/shallow.development.js	447 B
dist/umd/shallow.production.js	344 B
dist/umd/vanilla.development.js	590 B
dist/umd/vanilla.production.js	378 B
dist/vanilla.js	456 B

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