Use native base64 encoder when available

[ajeetdsouza]

Leverages https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array/toBase64 where possible. Improves performance of binary encoding in JSON.

Task	before (ns/op)	after (ns/op)	Δ
toJson/general	136,347	120,333	−11.7%
toJson/scalar	878.6	818.0	−6.9%
toJson/repeated-message	914,798	855,803	−6.4%
toJson/map-message	1,075,609	1,030,640	−4.2%
toJson/map-scalar	2,364.8	2,379.8	+0.6%
toJson/repeated-scalar	2,494.5	2,510.0	+0.6%
toJson/user-tiny	262.5	264.4	+0.7%
toJson/user-normal	660.8	667.1	+0.9%

This needs a follow up doing the same for fromBase64.

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
protobuf-es	Ignored	Preview	Jul 24, 2026 10:56am