API panics when serializing number literal types with `+Infinity` and `-Infinity`

[auvred]

🔎 Search Terms

api, getTypeAtLocation, number literal, infinity

🕗 Version & Regression Information

Fails on the current main

⏯ Playground Link

No response

💻 Code

1. Create repro dir

   mkdir /tmp/repro
   cd /tmp/repro
   npm init -y
   npm add typescript@7.0.2
   echo '{}' > tsconfig.json

2. Create files

   // index.ts
   export type Foo = 1e999
   
   // repro.mjs
   import path from 'node:path'
   import { API } from 'typescript/unstable/sync'
   
   const api = new API()
   const root = process.cwd()
   const filepath = path.join(root, 'index.ts')
   const tsconfigPath = path.join(root, 'tsconfig.json')
   const snapshot = api.updateSnapshot({ openProject: tsconfigPath })
   const project = snapshot.getProject(tsconfigPath)
   const file = project.program.getSourceFile(filepath)
   
   console.log(project.checker.getTypeAtLocation(file.statements[0].name).value)

3. Run repro

   node repro.mjs

🙁 Actual behavior

> node repro.mjs
file:///private/tmp/repro/node_modules/typescript/dist/api/syncChannel.js:237
                        throw new Error(this._msgPayload.toString("utf-8"));
                              ^

Error: panic: api: failed to write response: json: cannot marshal from Go float64 within "/value": unsupported value: +Inf
goroutine 1 [running]:
runtime/debug.Stack()
        runtime/debug/stack.go:26 +0x64
github.com/microsoft/typescript-go/internal/api.(*SyncConn).handleRequest.func1()
        github.com/microsoft/typescript-go/internal/api/conn_sync.go:120 +0x44
panic({0x105b7fd60?, 0x6312dfe23c00?})
        runtime/panic.go:860 +0x12c
github.com/microsoft/typescript-go/internal/api.(*SyncConn).handleRequest(0x6312dfb08c40, {0x105e2a0b8, 0x6312dfb08b00}, 0x6312e15d9e00)
        github.com/microsoft/typescript-go/internal/api/conn_sync.go:156 +0x5c0
github.com/microsoft/typescript-go/internal/api.(*SyncConn).Run(0x6312dfb08c40, {0x105e2a0b8, 0x6312dfb08b00})
        github.com/microsoft/typescript-go/internal/api/conn_sync.go:73 +0x140
github.com/microsoft/typescript-go/internal/api.(*StdioServer).Run(0x6312dfb13dc8, {0x105e2a0b8, 0x6312dfb08b00})
        github.com/microsoft/typescript-go/internal/api/server.go:123 +0x580
main.runAPI({0x6312df93c0e0, 0x2, 0x2})
        github.com/microsoft/typescript-go/cmd/tsgo/api.go:56 +0x340
main.runMain()
        github.com/microsoft/typescript-go/cmd/tsgo/main.go:25 +0xb8
main.main()
        github.com/microsoft/typescript-go/cmd/tsgo/main.go:14 +0x1c

    at SyncRpcChannel.requestBytesSync (file:///private/tmp/repro/node_modules/typescript/dist/api/syncChannel.js:237:31)
    at SyncRpcChannel.requestSync (file:///private/tmp/repro/node_modules/typescript/dist/api/syncChannel.js:164:29)
    at Client.apiRequest (file:///private/tmp/repro/node_modules/typescript/dist/api/sync/client.js:58:37)
    at Checker.getTypeAtLocation (file:///private/tmp/repro/node_modules/typescript/dist/api/sync/api.js:750:34)
    at file:///private/tmp/repro/repro.mjs:14:29
    at ModuleJob.run (node:internal/modules/esm/module_job:439:25)
    at async node:internal/modules/esm/loader:643:26
    at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:101:5)

Node.js v24.18.0

🙂 Expected behavior

.value is expected to be +Infinity

Additional information about the issue

No response