[New] add `onMissingKey` constructor option

airbnb / polyglot.js

Give your JavaScript the ability to speak many languages.

http://airbnb.github.io/polyglot.js

BSD 2-Clause "Simplified" License

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Closed ljharb closed 8 years ago

ljharb commented 8 years ago

This can call .transformPhrase, or return false, or undefined, or throw - whatever you like.

onMissingKey overrides allowMissing, which is now deprecated.

Fixes #34.