Syntax:
try import fs from 'fs'
else import fs from 'fs-polyfill'
else import fs from 'another-fs-polyfill'
else do nothing; // Not sure about syntax
try import {watchDirectory} from 'fs'
else import {watchDirectory} from 'fs-polyfill'
else if(process.os === 'ExoticSystem') import {watchDirectory} from
'another-fs-polyfill'
else throw Error('Your OS doesn\'t support watching directories');
Usages:
- Optional dependencies
- Polyfills
Problems:
- This can prevent loading modules before execution if presence of
modules can't be proved statically
- else-if requires execution before loading module - can be dropped
I don't have enough time and knowledge about modules to write actual
proposal.
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