i'll just ask the question: i help maintain this out-of-tree package here https://git.afnix.fr/afnix/nix-zulip and somewhere between c58ada2eda15d0576e9a2ad74bd8f2318509a40f and 20075955deac2583bb12f07151c2df830ef346b4 of nixpkgs, the build started failing with this error despite nothing in this repository changing:

+ ./tools/webpack --quiet
[webpack-cli] Failed to load '/build/zulip/web/webpack.config.ts' config
[webpack-cli] ReferenceError: exports is not defined in ES module scope
    at file:///build/zulip/web/webpack.config.ts:3:23
    at ModuleJobSync.runSync (node:internal/modules/esm/module_job:450:37)
    at ModuleLoader.importSyncForRequire (node:internal/modules/esm/loader:429:47)
    at loadESMFromCJS (node:internal/modules/cjs/loader:1519:24)
    at Module._compile (node:internal/modules/cjs/loader:1670:5)
    at Module._compile (/build/zulip/node_modules/.pnpm/pirates@4.0.6/node_modules/pirates/lib/index.js:117:24)
    at node:internal/modules/cjs/loader:1820:10
    at Object.newLoader [as .ts] (/build/zulip/node_modules/.pnpm/pirates@4.0.6/node_modules/pirates/lib/index.js:121:7)
    at Module.load (node:internal/modules/cjs/loader:1423:32)
    at Function._load (node:internal/modules/cjs/loader:1246:12)
    at TracingChannel.traceSync (node:diagnostics_channel:322:14)
    at wrapModuleLoad (node:internal/modules/cjs/loader:235:24)
    at Module.require (node:internal/modules/cjs/loader:1445:12)
    at require (node:internal/modules/helpers:135:16)
    at WebpackCLI.tryRequireThenImport (/build/zulip/node_modules/.pnpm/webpack-cli@6.0.1_webpack-dev-server@5.2.0_webpack@5.98.0/node_modules/webpack-cli/lib/webpack-cli.js:225:30)
    at loadConfigByPath (/build/zulip/node_modules/.pnpm/webpack-cli@6.0.1_webpack-dev-server@5.2.0_webpack@5.98.0/node_modules/webpack-cli/lib/webpack-cli.js:1390:38)
    at WebpackCLI.loadConfig (/build/zulip/node_modules/.pnpm/webpack-cli@6.0.1_webpack-dev-server@5.2.0_webpack@5.98.0/node_modules/webpack-cli/lib/webpack-cli.js:1490:44)
    at WebpackCLI.createCompiler (/build/zulip/node_modules/.pnpm/webpack-cli@6.0.1_webpack-dev-server@5.2.0_webpack@5.98.0/node_modules/webpack-cli/lib/webpack-cli.js:1755:33)
    at WebpackCLI.runWebpack (/build/zulip/node_modules/.pnpm/webpack-cli@6.0.1_webpack-dev-server@5.2.0_webpack@5.98.0/node_modules/webpack-cli/lib/webpack-cli.js:1851:31)
    at Command.<anonymous> (/build/zulip/node_modules/.pnpm/webpack-cli@6.0.1_webpack-dev-server@5.2.0_webpack@5.98.0/node_modules/webpack-cli/lib/webpack-cli.js:920:32)
    at Command.listener [as _actionHandler] (/build/zulip/node_modules/.pnpm/commander@12.1.0/node_modules/commander/lib/command.js:542:17)
    at /build/zulip/node_modules/.pnpm/commander@12.1.0/node_modules/commander/lib/command.js:1502:14
    at Command._chainOrCall (/build/zulip/node_modules/.pnpm/commander@12.1.0/node_modules/commander/lib/command.js:1386:12)
    at Command._parseCommand (/build/zulip/node_modules/.pnpm/commander@12.1.0/node_modules/commander/lib/command.js:1501:27)
    at /build/zulip/node_modules/.pnpm/commander@12.1.0/node_modules/commander/lib/command.js:1265:27
    at Command._chainOrCall (/build/zulip/node_modules/.pnpm/commander@12.1.0/node_modules/commander/lib/command.js:1386:12)
    at Command._dispatchSubcommand (/build/zulip/node_modules/.pnpm/commander@12.1.0/node_modules/commander/lib/command.js:1261:25)
    at Command._parseCommand (/build/zulip/node_modules/.pnpm/commander@12.1.0/node_modules/commander/lib/command.js:1457:19)
    at Command.parseAsync (/build/zulip/node_modules/.pnpm/commander@12.1.0/node_modules/commander/lib/command.js:1092:16)
    at Command.<anonymous> (/build/zulip/node_modules/.pnpm/webpack-cli@6.0.1_webpack-dev-server@5.2.0_webpack@5.98.0/node_modules/webpack-cli/lib/webpack-cli.js:1340:32)
    at Command.parseAsync (/build/zulip/node_modules/.pnpm/commander@12.1.0/node_modules/commander/lib/command.js:1092:5)
    at WebpackCLI.run (/build/zulip/node_modules/.pnpm/webpack-cli@6.0.1_webpack-dev-server@5.2.0_webpack@5.98.0/node_modules/webpack-cli/lib/webpack-cli.js:1344:9)
    at runCLI (/build/zulip/node_modules/.pnpm/webpack-cli@6.0.1_webpack-dev-server@5.2.0_webpack@5.98.0/node_modules/webpack-cli/lib/bootstrap.js:8:9)

Subcommand of ./tools/update-prod-static failed with exit status 2: ./tools/webpack --quiet
Actual error output for the subcommand is just above this.

and i'm curious if anyone knows off the top of their head what this is about/how to fix it