Typescript check crashing vite serve

[cwagner22]

Describe the bug

There are no typescript errors but every time I start my vite server, it crashes after a few hmr updates. All I see is this:

node:internal/event_target:1090
  process.nextTick(() => { throw err; });
                           ^
Error: Debug Failure. False expression.
    at getOptionalType (/Users/c/project/node_modules/.pnpm/typescript@5.6.2/node_modules/typescript/lib/typescript.js:70825:11)
    at tryReuseExistingTypeNode (/Users/c/project/node_modules/.pnpm/typescript@5.6.2/node_modules/typescript/lib/typescript.js:54296:16)
    at serializeTypeForDeclaration (/Users/c/project/node_modules/.pnpm/typescript@5.6.2/node_modules/typescript/lib/typescript.js:56314:61)
    at addPropertyToElementList (/Users/c/project/node_modules/.pnpm/typescript@5.6.2/node_modules/typescript/lib/typescript.js:55284:43)
    at createTypeNodesFromResolvedType (/Users/c/project/node_modules/.pnpm/typescript@5.6.2/node_modules/typescript/lib/typescript.js:55180:11)
    at createTypeNodeFromObjectType (/Users/c/project/node_modules/.pnpm/typescript@5.6.2/node_modules/typescript/lib/typescript.js:54955:25)
    at visitAndTransformType (/Users/c/project/node_modules/.pnpm/typescript@5.6.2/node_modules/typescript/lib/typescript.js:54878:24)
    at createAnonymousTypeNode (/Users/c/project/node_modules/.pnpm/typescript@5.6.2/node_modules/typescript/lib/typescript.js:54818:20)
    at typeToTypeNodeWorker (/Users/c/project/node_modules/.pnpm/typescript@5.6.2/node_modules/typescript/lib/typescript.js:54611:16)
    at typeToTypeNodeHelper (/Users/c/project/node_modules/.pnpm/typescript@5.6.2/node_modules/typescript/lib/typescript.js:54392:24)

Node.js v22.7.0
Warning: command "vite serve" exited with non-zero status code

The getOptionalType function crashes on line Debug.assert(strictNullChecks) because I have strict: false in my tsconfig.

Reproduction

I haven't yet narrowed down a way to reproduce the issue because this is a nx monorepo. I will add it if I find a way. Here is the --showConfig output.

{
    "compilerOptions": {
        "rootDir": "../..",
        "sourceMap": true,
        "declaration": false,
        "moduleResolution": "node10",
        "emitDecoratorMetadata": true,
        "experimentalDecorators": true,
        "importHelpers": true,
        "target": "es2021",
        "module": "esnext",
        "lib": [
            "es2021",
            "dom"
        ],
        "skipLibCheck": true,
        "skipDefaultLibCheck": true,
        "resolveJsonModule": true,
        "baseUrl": "./src",
        "paths": {
            "@ui/*": [
                "../../ui/src/*"
            ],
        },
        "strict": false,
        "jsx": "react-jsx",
        "allowJs": false,
        "esModuleInterop": false,
        "allowSyntheticDefaultImports": true,
        "jsxImportSource": "@emotion/react",
        "types": [
            "node",
            "@nx/react",
            "vite/client"
        ],
        "outDir": "../../dist/out-tsc",
        "noEmit": true
    },
    "files": [...],
    "include": [
        "src/**/*.js",
        "src/**/*.jsx",
        "src/**/*.ts",
        "src/**/*.tsx"
    ],
    "exclude": [
        "src/**/*.spec.ts"
    ]
}

Expected behavior

No crash

System Info

Node: 22.7.0
vite-plugin-checker: 0.8.0
typescript: 5.6.2

Additional context

checker({
  typescript: {
    tsconfigPath: 'tsconfig.app.json',
  },
})

No response

Validations

• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.

[Amnesthesia]

We're also getting this, but with webpack

Seems to be unrelated to vite and probably related to something in typescript 5.3+

[spradlin-dev]

I'm seeing the same issue with vite in both typescript 5.6.2 and 5.2.2

[gkonuralp]

Also happening with typescript 5.7.2 and I haven't been able to find a solution for a long time.

[Onurfesci]

I've had this in my project for a while, although I don't know the root cause, the behaviour seems to be some sort of cache issue, because I can fix it by doing the following:

• In the respective tsconfig, I have "strict": false". I flip this to true and run tsc again
• I get a lot of TS errors but it runs successfully
• I flip it to false again, and tsc runs fine now

Hopefully this helps as a temp fix even if it doesn't solve the root problem... Nevertheless it's really annoying having to do this multiple times a day just to be able to run a type check :(

[Onurfesci]

Note: Typescript v5.7.3 has fixed this issue for me!

[spradlin-dev]

typescript 5.7.3 resolved the issue for me too