package that uses buffer as dependency fails

[wighawag]

Error

[mf:err] MiniflareError: Unable to resolve "dist/index.mjs" dependency "buffer": no matching module rules
[mf:err] MiniflareError: Unable to resolve "dist/index.mjs" dependency "buffer": no matching module rules
    at ScriptLinker._linker (/home/wighawag/dev/wighawag/etherplay/conquest-agent-service/node_modules/miniflare/src/scripts.ts:126:13)
    at ModuleWrap.<anonymous> (internal/vm/module.js:321:30)
    at SourceTextModule.<computed> (internal/vm/module.js:320:36)
    at SourceTextModule.link (internal/vm/module.js:198:22)
    at ScriptBlueprint.buildModule (/home/wighawag/dev/wighawag/etherplay/conquest-agent-service/node_modules/miniflare/src/scripts.ts:42:18)
    at Miniflare._Miniflare_reloadWorker (/home/wighawag/dev/wighawag/etherplay/conquest-agent-service/node_modules/miniflare/src/index.ts:180:26)
    at Miniflare._Miniflare_watchCallback (/home/wighawag/dev/wighawag/etherplay/conquest-agent-service/node_modules/miniflare/src/index.ts:124:29)
    at OptionsWatcher._init (/home/wighawag/dev/wighawag/etherplay/conquest-agent-service/node_modules/miniflare/src/options/watcher.ts:100:16)
    at Miniflare.getOptions (/home/wighawag/dev/wighawag/etherplay/conquest-agent-service/node_modules/miniflare/src/index.ts:292:5)

[mrbbot]

Hey! 👋 It looks like you're trying to import an npm module without a build-step. Workers only natively support modules that are located in your upload directory, not node_modules. Check out https://miniflare.dev/recipes/esbuild.html for an example of using esbuild to bundle your code first. Let me know if you have any issues with this. 👍

[wighawag]

Hey @mrbbot thanks for the quick answer

I am using the rollup configuration from cloudflare typescript template here : https://github.com/cloudflare/durable-objects-typescript-rollup-esm

I guess the rollup config is missing some option ?

I ll investigate more and might as well switch to esbuild that I am using for my frontend through vite anyway.

[janat08]

close?

[faisalil]

@janat08 , @wighawag, @mrbbot , I am having the same problem with a different package. I am getting
MiniflareError: Unable to resolve "dist/index.mjs" dependency "perf_hooks": no matching module rules
and I am using the rollback template setup. Any hints for what would fix it?

[janat08]

Hey! 👋 It looks like you're trying to import an npm module without a build-step. Workers only natively support modules that are located in your upload directory, not node_modules. Check out https://miniflare.dev/recipes/esbuild.html for an example of using esbuild to bundle your code first. Let me know if you have any issues with this.