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@veronicaz41 veronicaz41 commented Jun 28, 2024

"@pcd/gpc" has dependency "@pcd/gpcircuits" which in turn depends on fastfile.

"fastfile" uses node modules "fs", "constants" and global "process" (process.browser).
We need to polyfill these in order for it to work in browser.

Otherwise, here is the build error I'm getting when running "yarn build"

../../node_modules/fastfile/src/fastfile.js
Can't import the named export 'O_CREAT' (imported as 'O_CREAT') from default-exporting module (only default export is available)

Import trace for requested module:
../../node_modules/fastfile/src/fastfile.js
../../node_modules/@pcd/gpcircuits/dist/esm/src/artifacts.js
../../node_modules/@pcd/gpcircuits/dist/esm/src/index.js
../../node_modules/@pcd/gpc/dist/esm/src/gpc.js
../../node_modules/@pcd/gpc/dist/esm/src/index.js
./app/util/generateProof.ts
./app/prover/page.tsx

This PR (see next.config.js) shows how to fix it in Next.js (uses webpack 5).


snark.js uses rollup, and here is how it does the polyfill.


zupass repo uses esbuild, and it uses the the plugin from "@esbuild-plugins/node-modules-polyfill" to do the polyfill.

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config.resolve.fallback = {
fs: false
};
config.resolve.alias = {
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Can you document what this is required for? Maybe a comment here would be a good place to document the underlying issue.

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3 participants