caridy

Modules Harmony Simplification Effort

Disclaimer: This text is exclusively focused on the existing capabilities of the language, and does not weight into additional capabilities like wasm, or virtual modules, or compartments. Those can be discussed later on.

MVP to create a module graph

The bare minimum mechanism to create a module graph that matches ESM requires few main pieces:

1. A portable (serializable) structure that represents the source text of the module. ModuleSource must be portable across processes and across realms.
2. A realm based Module that closes over a ModuleSource.

caridy

Transferring objects between a ShadowRealm and an incubator realm

• Problem: We can only transfer callable objects and primitive values between a ShadowRealm and an incubator realm.
• This code demonstrates a simple solution (that’s not completely safe).
  • Runs in Safari Technology Preview: https://webkit.org/blog/12522/release-notes-for-safari-technology-preview-142/
• A more complete solution: https://github.com/caridy/irealm

Material:

• Proposal for ShadowRealms: https://github.com/tc39/proposal-shadowrealm

caridy

// default exports
export default 42;
export default {};
export default [];
export default foo;
export default function () {}
export default class {}
export default function foo () {}
export default class foo {}

caridy

interface EvaluatorInit {
    importHook(name, referrer): Promise<ParsedModule>;
    isDirectEvalHook(evalFunctionRef: any): boolean;
    randomHook(): number; // Use for Math.random()
    nowHook(): number; // Use for both Date.now() and new Date(),
    localeHook(): string; // e.g.: 'fr-FR' - Affects appropriate ECMA-402 APIs within Realm
    LocalTZAHook(): string; // This is important to be able to override for deterministic testing and such
    canCompileStringsHook(source: String): boolean; // mimic CSP including nounces
    thisValue?: object;
}

caridy

Updated (Aug 2nd, 2016)

API Refinements:

• The default global scope when creating a new realm has no extra capabilities, it is confusing, we can remove it.
• The realm object is the real power object, and users can decide to share it or not via endowments.
• In a realm, you can create as many global scopes as you want via realmObj.createNewGlobalScope().
• No more proxy-like API at the realm level, if you want to proxy a global, that should be used when creating a new global scope.

The API proposal:

caridy

import {b} from "./b.js";
import $ from "jquery";

export function a() {
  // ...
}

caridy

What is this?

This is a gist to showcase how to have client affinity modules that are required by common affinity modules without breaking the app when trying to use the common affinity modules on the server side.

Instalation

npm install
node app.js

caridy

What is this?

This is a gist to showcase how to deal with vendor scripts when using express-yui, in this particular case, loading jquery as a yui module.

Instalation

npm install
node app.js

caridy

What is this?

This is a gist to showcase how to patch a yui core module when using express-yui, in this particular case, patching the router module by defining a new module router-patched as a replacement for the original module core module router.

Instalation

npm install
node app.js

caridy

What is this?

This is a prototype for the low-level api to serialize express routes into the client side.

Installation

npm install
node simple.js
node complex.js