Parcel support for import.meta

❔ Question

Are there any plans for Parcel to support the import.meta Javascript object in the near future? https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import.meta

🔦 Context

I have a requirement to use Javascript’s import.meta in my module code, which I then use to build a url string to download and start a web worker. My code is entirely ES6 modular.

💻 Code Sample

const buildFilterWorker = function () {

let path = import.meta.url.slice(0, -('factory/filter.js'.length))
let filterUrl = `${path}worker/filter.js`;
return new Worker(filterUrl);

};

Running Parcel leads to the following build error:

$ parcel index.html Server running at http://localhost:1234 🚨 factory/filter.js:191:19: Support for the experimental syntax ‘importMeta’ isn’t currently enabled (191:20): 189 | const buildFilterWorker = function () { 190 |

191 | let path = import.meta.url.slice(0, -(‘factory/filter.js’.length)) | ^

🌍 Your Environment

Software	Version(s)
Parcel	1.12.3
Node	12.6.0
npm/Yarn	npm 6.9.0
Operating System	MacOSX

[jkrems]

I propose we add import.meta.hot as a replacement for module.hot.

I was about to open issue asking for that. Right now it doesn’t seem possible to write a valid ES module that also supports hot reload (because it needs to reference a “file-scoped” module).

[mischnic]

Vite does use import.meta.env instead of process.env