Hi @U05224H0W good to hear from you. It looks like it might be skipping the require and just returning the string for the requirement:

ajax.xml_http_request.xmlhttprequest="undefined"

actually, sorry, it looks like it's resolving to null

let me see if I can shim it

could you use something like https://github.com/ts-smith/browserify-shim-cljs/blob/master/src/leiningen/browserify_shim.clj in shadow to change (js/require) statements to (js/import)s?

for the :esm https://antfu.me/posts/publish-esm-and-cjs

sorry I don't know what you are doing so I cannot provide any tips

you definitely cannot change any js/require into import. that just doesn't work, they do entirely different things

I'm trying to do something like this guy: https://gist.github.com/borkdude/7e548f06fbefeb210f3fcf14eef019e0

but I'm getting an error

; SHADOW import error D:\projects\census\census-geojson\.shadow-cljs\builds\node-repl\dev\out\cljs-runtime\shadow.js.shim.module$node_fetch.js
; 
; Execution error (Error) at (<cljs repl>:1).
require() of ES Module D:\projects\census\census-geojson\node_modules\node-fetch\src\index.js from D:\projects\census\census-geojson\[stdin] not supported.
Instead change the require of index.js in D:\projects\census\census-geojson\[stdin] to a dynamic import() which is available in all CommonJS modules.
:repl/exception!

yes, that is node telling you that you cannot require ESM packages

maybe its enough to change your node-fetch version? older versions did ship CJS code

true, but would that work with the :esm target?

:esm can import ESM code yes

that's the target I'm using...

let me write up a gist

here's my setup

https://gist.github.com/loganpowell/579edc529f2e6b3cdcb1f796bdab7dd1

> ; Connected session: cljs, repl: node-repl

and ESM doesn't support a REPL in node currently

so you are not using the :esm build at all

when I do:

clj꞉shadow.user꞉> 
; Creating cljs repl session...
; Connecting cljs repl: shadow-cljs...
;   The Calva Connection Log might have more connection progress information.
; Connected session: cljs, repl: :lib
; TIPS: You can choose which REPL to use (clj or cljs):
;    *Calva: Toggle REPL connection*
;    (There is a button in the status bar for this)
; Evaluating file: tests.cljs
; No available JS runtime.
; See 
nil
cljs꞉cljs.user꞉> 

I get No available JS runtime

yes, because you need to run the generated JS

but as I just said. ESM does not support a node REPL

so you won't get a runtime no matter what

hmm...

so I can't REPL with :esm?

no, since you are supposed to use node-repl for that. ESM just gets in the way

I don't have a solution for that currently

gotcha. so, no ESM while REPL'ng

well the ESM browser has a REPL

:browser target?

node just isn't implemented

no :esm loaded in the browser, not node

oh man 😄

let me try to find an older version of node-fetch 😄

found https://www.npmjs.com/package/node-fetch-commonjs.

seems like a good hack: use a commonjs version of the lib during development ("devDependencies") and then swap it out for esm for the :esm build

Ok, I think I'm almost there! I have a solution that should work in Node and the browser using lambdaisland.fetch and the following conditional :

(when isNode (set! js/fetch node-fetch))

fetch is not defined 

// looks like it's referencing the lib:
Mi(In,rn,function(a,b,c){try{return Km(Pm(b.text.call(b),function(d){var e=Rs.h(c,C(Mt)).read(d);if(null!=e?e.v&262144||D===e.Lf||(e.v?0:y(Ib,e)):y(Ib,e)){var f=qd(e);d=Hf.j?Hf.j(f,Ps,d):Hf.call(null,f,Ps,d);e=pd(e,d)}return e}))}catch(d){return Nm(d)}});Mi(In,Wl,function(a,b){return b.json.call(b)});var Nt=esm_import$node_fetch <<------- :)

// ... but further down
Gh("ąàáäâãåæăćčĉęèéëêĝĥìíïîĵłľńňòóöőôõðøśșšŝťțŭùúüűûñÿýçżźž","aaaaaaaaaccceeeeeghiiiijllnnoooooooossssttuuuuuunyyczzz");var Tt="undefined"!==typeof process&&"undefined"!==typeof process&&"undefined"!==typeof process.versions&&"undefined"!==typeof process&&"undefined"!==typeof process.versions&&"undefined"!==typeof process.versions.node,fq=Tt?"":"",dq=Error;Tt&&(fetch=Nt) <<------- why?

Here's my shadow-cls.edn build setup:

:builds       {:lib {:target           :esm
                      :output-dir       "public/census"
                      :modules {:census {:exports {default census.core/census}}}
                      :js-options {:js-provider :import}
                      :compiler-options {:optimizations :advanced}}

https://shadow-cljs.github.io/docs/UsersGuide.html#compile-stages