I don't think so, because: - Using promises to import module is not always desirable - This mechanism doesn't impact ability to statically analyze modules if ifs are excluded - it can only increase resolution time.
On Fri, Mar 1, 2019 at 1:56 PM Herby Vojčík <[email protected]> wrote: > On 1. 3. 2019 12:04, Michał Wadas wrote: > > 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'); > > I am not an expert, but afaict ES module system was created to be > statically analysable and this bring uncertainity. > > For that probably dynamic import() is there; and your usage should await > for a promise that tries to load one then the other etc. > > Herby > > > 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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