Build error You must provide the URL of lib/mappings.wasm

[bre7]

🐛 bug report

Build was working fine days ago (before env was updated to Node 18).

🎛 Configuration (.babelrc, package.json, cli command)

parcel build --target=target2 dist2/perm.html --no-scope-hoist

.terserrc

{
  "compress": {
    "drop_console": true
  }
}

🤔 Expected Behavior

Build should be successful.

😯 Current Behavior

Error message is displayed on console:

@parcel/optimizer-terser: You must provide the URL of lib/mappings.wasm by
calling SourceMapConsumer.initialize({ 'lib/mappings.wasm': ... }) before using
SourceMapConsumer

  Error: You must provide the URL of lib/mappings.wasm by calling
  SourceMapConsumer.initialize({ 'lib/mappings.wasm': ... }) before using
  SourceMapConsumer
  at readWasm
  (/home/circleci/project/web/node_modules/terser/node_modules/source-map/lib/read-wasm.js:8:13)
  at wasm
  (/home/circleci/project/web/node_modules/terser/node_modules/source-map/lib/wasm.js:25:16)
  at
  /home/circleci/project/web/node_modules/terser/node_modules/source-map/lib/source-map-consumer.js:264:14
  at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
  at async SourceMap
  (/home/circleci/project/web/node_modules/terser/dist/bundle.min.js:19385:20)
  at async minify
  (/home/circleci/project/web/node_modules/terser/dist/bundle.min.js:27785:41)
  at async Object.optimize
  (/home/circleci/project/web/node_modules/@parcel/optimizer-terser/lib/TerserOptimizer.js:131:16)
  at async PackagerRunner.optimize
  (/home/circleci/project/web/node_modules/@parcel/core/lib/PackagerRunner.js:364:20)
  at async PackagerRunner.getBundleResult
  (/home/circleci/project/web/node_modules/@parcel/core/lib/PackagerRunner.js:255:15)
  at async PackagerRunner.getBundleInfo
  (/home/circleci/project/web/node_modules/@parcel/core/lib/PackagerRunner.js:239:9)

💁 Possible Solution

Workaround was to rollback to Node 17 (17.9.0)

🔦 Context

💻 Code Sample

🌍 Your Environment

CircleCI with docker image cimg/node:18.0

Software	Version(s)
Parcel	2.4.0
Node	18.0.0
npm/Yarn	1.22.18
Operating System	Ubuntu 20.04.4 LTS

[devongovett]

Based on the stack trace, looks like a problem with terser?

[jtojnar]

A bug in source-map: mozilla/source-map#432
Fixed but not in any stable version: mozilla/source-map#452
Terser bumped the dependency to beta but it have not had a release yet either: terser/terser#1164

[Mirokko]

It is already merged. https://github.com/terser/terser/blob/v5.13.1/package.json#L48

[benpigchu]

As another workaround, export NODE_OPTIONS=--no-experimental-fetch should work

[bre7]

Thanks ! Closing since both a solution (update terser or force resolution) and a workaround were provided

[neoswf]

I have updated Parcel locally and all dependencies, and even though I had to apply @benpigchu solution to be able to build.