Preflight Checklist

• I have read the troubleshooting guide
• I have searched existing issues and this is not a duplicate
• This is a bug with the VS Code extension, not with how Prettier formats code

Issue Summary

after upgrade to v12.1.0, plugin based on wasm does not work anymore

["ERROR" - 08:41:43] WebAssembly.instantiateStreaming is not a function
TypeError: WebAssembly.instantiateStreaming is not a function
	at file:///Users/caicongcong/dev/warpo/node_modules/assemblyscript-prettier/node_modules/assemblyscript/dist/assemblyscript.js:9:38049

Reproduction Repository

https://github.com/wasm-ecosystem/warpo

Steps to Reproduce

1. clone the repo
2. change some format in assemblyscript/src/...
3. format with plugin

Expected Behavior

plugin with wasm can be load successfully

Actual Behavior

error

Operating System

macOS

VS Code Version

Version: 1.108.1 Commit: 585eba7c0c34fd6b30faac7c62a42050bfbc0086 Date: 2026-01-14T14:55:44.241Z Electron: 39.2.7 ElectronBuildId: 12953945 Chromium: 142.0.7444.235 Node.js: 22.21.1 V8: 14.2.231.21-electron.0 OS: Darwin arm64 25.2.0

Prettier Extension Version

v12.1.0

Prettier Version

3.6.2

Prettier Extension Logs

["ERROR" - 08:41:43] WebAssembly.instantiateStreaming is not a function
TypeError: WebAssembly.instantiateStreaming is not a function
	at file:///Users/caicongcong/dev/warpo/node_modules/assemblyscript-prettier/node_modules/assemblyscript/dist/assemblyscript.js:9:38049

Prettier Configuration

printWidth: 120
tabWidth: 2
useTabs: false
semi: true
singleQuote: false
quoteProps: "as-needed"
jsxSingleQuote: false
trailingComma: "es5"
bracketSpacing: true
arrowParens: "always"
vueIndentScriptAndStyle: false
endOfLine: "lf"
plugins:
  - assemblyscript-prettier