Very slow tsserver

[Malin88]

I have a monorepo with two applications, the first one is a honoJS API and the second one is a nextJS application.
If I add a reference to hono in tsconfig.json to use RPC and have nice typing in the nextJS application, tsserver needs 5-10 seconds to check for errors with each change.

Based on the tsserver logs, the most time is spent on "semanticDiag". Has anyone encountered this problem?

my nextJS tsconfig.json:

{
	"extends": "@dr/typescript-config/nextjs.json",
	"compilerOptions": {
		"baseUrl": ".",
		"paths": {
			"@admin/*": ["./src/*"],
			"@dr/ui/*": ["../../packages/ui/src/*"],
			"@api/*": ["../api/src/*"]
		},
		"plugins": [
			{
				"name": "next"
			}
		]
	},
	"include": ["next-env.d.ts", "next.config.mjs", "**/*.ts", "**/*.tsx", ".next/types/**/*.ts"],
	"exclude": ["node_modules"],
	"references": [
		{
			"path": "../api"
		}
	]
}

and for hono:

{
  "compilerOptions": {
    "composite": true,
    "target": "ESNext",
    "jsx": "react-jsx",
    "jsxImportSource": "hono/jsx",
    "rootDir": "./src",
    "module": "ESNext",
    "moduleResolution": "Node",
    "paths": {
      "@/*": ["./src/*"]
    },
    "resolveJsonModule": true,
    "strict": true,
    "declaration": true,
    "declarationMap": true,
    "allowSyntheticDefaultImports": true,
    "esModuleInterop": true,
    "skipLibCheck": true,
    "noImplicitAny": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "lib": ["ESNext"],
    "outDir": "./dist",
    "baseUrl": ".",
    "forceConsistentCasingInFileNames": true,
    "isolatedModules": true,
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "noFallthroughCasesInSwitch": true
  },
  "include": ["src/**/*"],
  "exclude": ["node_modules", "dist"]
}

[pjeziorowski]

It's super slow for me too, sveltekit + hono monorepo

[yusukebe]

This may be related to #3869

[yusukebe]

Hi @Malin88 @pjeziorowski

This is a known issue and difficult to resolve immediately, but we should do it. Can you share a small project to reproduce it, if possible? I can investigate it.

[Malin88]

@yusukebe This is the project I am currently working on https://github.com/Malin88/next-hono it's quite small for now, but in hono there are 6 routes added. With one everything works +- ok, but when I add more then TS has problems.

[yusukebe]

@Malin88 Thanks. I'll take a look.

[yusukebe]

This related to #3869

[yusukebe]

@Malin88

I tried to use your code for a while. I think the routes to passing the hc are huge. This is a known issue described in the following, and you can avoid it with "Compile your code before using it" way:

https://hono.dev/docs/guides/rpc#compile-your-code-before-using-it-recommended

The completion performance will be improved:

code.mp4

This is a big problem with our RPC feature. We can discuss it at #3869.