On 1. 3. 2019 18:35, Michał Wadas wrote:
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.
Yeah, if 'if's are excluded. That version with those ifs was what was concerning. That actually needs runtime to do the work. I suppose until it doesn't need the runtime, it's all ok.
On Fri, Mar 1, 2019 at 1:56 PM Herby Vojčík <[email protected] <mailto:[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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