All sourcemaps tests fail: `Error: You must provide the URL of lib/mappings.wasm by calling SourceMapConsumer.initialize({ 'lib/mappings.wasm': ... }) before using SourceMapConsumer`

[discapes]

Describe the bug

For all sourcemaps tests, I get the following error:

1) sourcemaps
       attached-sourcemap:
     Error: You must provide the URL of lib/mappings.wasm by calling SourceMapConsumer.initialize({ 'lib/mappings.wasm': ... }) before using SourceMapConsumer
      at readWasm (node_modules\source-map\lib\read-wasm.js:8:13)
      at wasm (node_modules\source-map\lib\wasm.js:25:16)
      at C:\Users\MiikaTuominen\code\svelte\node_modules\source-map\lib\source-map-consumer.js:264:14
      at Context.<anonymous> (test\sourcemaps.solo\index.ts:106:51)

Reproduction

git clone https://github.com/sveltejs/svelte.git
cd svelte
npm i
mv test/sourcemaps test/sourcemaps.solo
npm run test

Logs

npx mocha --exit
(node:6964) ExperimentalWarning: The Fetch API is an experimental feature. This feature could change at any time
(Use `node --trace-warnings ...` to show where the warning was created)


  sourcemaps
    1) attached-sourcemap
    2) basic
    3) binding
    - binding-shorthand.skip
    4) compile-option-dev
    5) css
    6) decoded-sourcemap
    7) each-block
    8) external
    9) markup
    √ no-sourcemap
    10) only-css-sourcemap
    11) only-js-sourcemap
    12) preprocessed-markup
    13) preprocessed-multiple
    14) preprocessed-no-map
    15) preprocessed-script
    16) preprocessed-styles
    17) script
    18) script-after-comment
    19) source-map-generator
    20) sourcemap-basename
    21) sourcemap-basename-without-outputname
    22) sourcemap-concat
    23) sourcemap-names
    24) sourcemap-offsets
    25) sourcemap-sources
    26) static-no-script
    27) two-scripts
    28) typescript


  1 passing (865ms)
  1 pending
  28 failing

  1) sourcemaps
       attached-sourcemap:
     Error: You must provide the URL of lib/mappings.wasm by calling SourceMapConsumer.initialize({ 'lib/mappings.wasm': ... }) before using SourceMapConsumer
      at readWasm (node_modules\source-map\lib\read-wasm.js:8:13)
      at wasm (node_modules\source-map\lib\wasm.js:25:16)
      at C:\Users\MiikaTuominen\Downloads\s\svelte\node_modules\source-map\lib\source-map-consumer.js:264:14
      at Context.<anonymous> (test\sourcemaps.solo\index.ts:106:51)

...

  28) sourcemaps
       typescript:
     Error: You must provide the URL of lib/mappings.wasm by calling SourceMapConsumer.initialize({ 'lib/mappings.wasm': ... }) before using SourceMapConsumer
      at readWasm (node_modules\source-map\lib\read-wasm.js:8:13)
      at wasm (node_modules\source-map\lib\wasm.js:25:16)
      at C:\Users\MiikaTuominen\Downloads\s\svelte\node_modules\source-map\lib\source-map-consumer.js:264:14
      at Context.<anonymous> (test\sourcemaps.solo\index.ts:106:51)```

System Info

Binaries:
    Node: 18.0.0 - C:\Program Files\nodejs\node.EXE
    npm: 8.15.0 - C:\Program Files\nodejs\npm.CMD
  npmPackages:
    rollup: ^1.27.14 => 1.27.14

Severity

annoyance

[Conduitry]

Interesting. I can reproduce this locally, only on Windows. But it's passing in CI, so I don't know what that means.

[bluwy]

Looks like a bug in source-map 0.7.3 where the load-wasm.js file is incorrectly published (fixed in mozilla/source-map#456). See 0.7.3 vs 0.7.4. Because you're using node 18 where a global fetch exists, it thinks that you're running in the browser.