100%. I've tested deno with the feature flag — all it needs is the upstream v8 to unflag it
deno repl --v8-flags=--harmony-temporal
I couldn't test it in bun, but it should be the same thing, except that it depends on JavaScriptCore instead of v8. But basically nodejs, deno and bun don't really need to do anything — just wait for v8 and JSCore.
Browsers are waiting for the proposal to signal that it's ready to be unflagged. Right now it states it must be behind a flag.
deno repl --v8-flags=--harmony-temporal
I couldn't test it in bun, but it should be the same thing, except that it depends on JavaScriptCore instead of v8. But basically nodejs, deno and bun don't really need to do anything — just wait for v8 and JSCore.
Browsers are waiting for the proposal to signal that it's ready to be unflagged. Right now it states it must be behind a flag.