In the browser there are WHATWG Transferable Streams which provides a means
to read and write to different context using WHATWG Streams, for example
using the readable and writable pairs of a TransformStream. Effectively
meaning it's possible to communicate between an iframe and a window or a
window and a window, or a Worklet and a Worker, etc.
There is also WebAssembly.Memory, which provides a means to read and write
to the same linear memory object between different contexts.
In Node.js there is --import flag to preload modules; in Bun there is the
-r option to preload modules, which effectively provides a means to set
objects and definitions of objects globally before the main module loads.
For example, let's say we wanted to define Node.js' fs.readSync function
onto Node.js' process.stdin, in preprocess-module.js
import process from "node:process";
import { readSync } from "node:fs";
process.stdin.readSync = readSync;
export {};
node --import preprocess.module module.ts
Re
> I've tried overwriting one context's global `Object`
That can be potentially disasterous since Object itself is writable, we can
do
Object = 1;
in one context and Object.assign() would throw in the nth context.
On Friday, February 14, 2025 at 9:23:38 AM UTC [email protected] wrote:
> On Thu, Feb 13, 2025 at 2:23 AM Charles Lew <[email protected]> wrote:
>
>> I'm seeking for a way to share the same JSRealm with different v8
>> contexts, so they share the same `Object` values in memory, but with
>> different global values.
>>
>> Currently when evaluating `a instanceof Object` with `a` value defined
>> from another context, this evaluates to false, which is not what i want.
>>
>>
> this can work as a workaround ... if( obj.constructor.name === "Object"
> )
> but probably the better answer is 'don't do that'.
>
>
>> What i've tried:
>> I've tried overwriting one context's global `Object` with value from
>> another context, which seems ok at first, but it's flawed in corner cases,
>> that literal object values still uses the V8::Context's original Object
>> prototype.
>>
>> Is there a way to accomplish what i want?
>>
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>>
>
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