ECMA-402 Intl spec's internal FallbackSymbol.

This Symbol is well-known - shared across realms.

It is present in the following engines with the description "IntlLegacyConstructedSymbol" (spec):

• node >= 16
• Chrome >= 91
• Safari >= 14.1
• Firefox >= 54

It is present in the following engines with the description "IntlFallback": _{(The ES2017 Intl spec did not specify a description)}

• node >=8 <16
• Chrome 57 - 90

When it is present, the package will export it; when not, it will export undefined.

var IntlFallbackSymbol = require('intl-fallback-symbol');

var assert = require('assert');

assert(typeof IntlFallbackSymbol === 'symbol');

Simply clone the repo, npm install, and run npm test