for those who have maintained an open source JavaScript library for at least 5 years: how long did you keep maintaining callback pattern support alongside 'new' promise support when it was ratified? I lean heavily towards backwards compatibility so users don't need transpilation.
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thank you for this reference
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What about callbacks which could be called multiple times? Promise does not fit this pattern.
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sounds like an event emitter or stream
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& Web Standards TL; Blink API OWNER
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