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Aral Balkan

There are times I think JavaScript (and Node.js) do deserve their reputation…

(Ok, ok, I don’t, but what is this, really?)

“Date.prototype.toISOString called on incompatible receiver [object Date]”

*smh*

#nodeJS#javaScript#js
Public *
Aral Balkan

So in case anyone was following this: it appears that built-in objects like Date in JavaScript have some internal magic (read: inconsistencies)* that means you can’t proxy them as you would normally.

More info: codeberg.org/small-tech/jsdb/i

Not sure if this is fixable in . The “solution” might be to discourage use of Date objects and instead persist timestamps. Which is, quite frankly, a pain in the ass.

I’ll keep looking for a workaround…

* internal slots

Codeberg.orgProxy does not work in Date in JavaScriptWhen calling prototype methods on a Date() object that’s been peristed and read back you get the following error: ``` [TypeError: Method Date.prototype.toISOString called on incompatible receiver [object Date]] ``` This is apparently due to some built-in objects having magic behaviour (“internal slots”), which means that they cannot be proxied normally (see https://stackoverflow.com/a/57958494) Unfortunately, I cannot implement the workaround of manually binding functions to their objects in the get handler either as bound functions do not serialise in a manner that can be evaluated back to get their value: ``` Object.create(typeof bound Object === 'function' ? bound Object.prototype : {} ``` Unless I figure out some way to work around this, the docs should be updated to discourage persistence of Date of objects (in favour of persisting timestamps).
#nodeJS#javaScript#js
Aral Balkan

Right, implemented workaround for JavaScript’s Proxy / Date object incompatibility in JavaScript Database (JSDB)¹ and released in version 3.0.2².

Calling methods on persisted Date objects read back into memory now works as it should.

Workaround (diff): codeberg.org/small-tech/jsdb/c
3.0.2 update (diff): codeberg.org/small-tech/jsdb/c

Kudos to Pravin Divraniya for stackoverflow.com/a/57958494

¹ codeberg.org/small-tech/jsdb
² npmjs.com/package/@small-tech/

Summary card of repository small-tech/jsdb
Codeberg.orgjsdbA zero-dependency, transparent, in-memory, streaming write-on-update JavaScript database for the Small Web that persists to a JavaScript transaction log.
#JSDB#JavaScript#JS
May 22, 2023, 11:02 AM·Public·Web
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