ts-node: Property 'body' does not exist on type 'Request'.

Problem/Feature Request Summary

There seem to be something wrong with the typings of koa-body. You sometimes get unexpected results when used together with ts-node:

/Users/m41n/source/repos/koabody/node_modules/ts-node/src/index.ts:261
    return new TSError(diagnosticText, diagnosticCodes)
           ^
TSError: ⨯ Unable to compile TypeScript:
src/controller.ts(5,39): error TS2339: Property 'body' does not exist on type 'Request'.

    at createTSError (/Users/m41n/source/repos/koabody/node_modules/ts-node/src/index.ts:261:12)
    at getOutput (/Users/m41n/source/repos/koabody/node_modules/ts-node/src/index.ts:367:40)
    at Object.compile (/Users/m41n/source/repos/koabody/node_modules/ts-node/src/index.ts:557:11)
    at Module.m._compile (/Users/m41n/source/repos/koabody/node_modules/ts-node/src/index.ts:439:43)
    at Module._extensions..js (internal/modules/cjs/loader.js:700:10)
    at Object.require.extensions.(anonymous function) [as .ts] (/Users/m41n/source/repos/koabody/node_modules/ts-node/src/index.ts:442:12)
    at Module.load (internal/modules/cjs/loader.js:599:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
    at Function.Module._load (internal/modules/cjs/loader.js:530:3)
    at Module.require (internal/modules/cjs/loader.js:637:17)
[nodemon] app crashed - waiting for file changes before starting...

Environment Information

• koa-body: 4.0.4
• koa: 2.5.2
• node: 10.6.0

Steps to Reproduce

reproducible repo: https://github.com/jwldnr/koabody

• install dependencies using yarn
  -> cd koabody && yarn

• start nodemon
  -> yarn serve

… initial compile is ok (?). (no errors)

• open src/controller.ts and edit the console.log line while nodemon is running

e.g. console.log("initial", email)
-> console.log("changed", email)

Error:
TSError: ⨯ Unable to compile TypeScript: src/controller.ts(5,39): error TS2339: Property 'body' does not exist on type 'Request'.

[UncleYee]

{
  "compilerOptions": {
    "types": [
      "koa-body",
    ]
  },
}

[doveccl]

I think its the defect of ts-node, similar problem occurs to me. For the same project:

• run tsc will compile without error
• run ts-node will get: error TS2459: Type ‘Request’ has no property ‘body’ and no string index signature

I tried to add additional config to tsconfig.json, and then the error disappeared:

{
	"compilerOptions": {
		"typeRoots": [
			"./node_modules/@types",
			"./node_modules/koa-body"
		],
		// ...
	}
}

It is because tsc could find node_modules/koa-body/index.d.ts, but ts-node can’t. ts-node will only search d.ts files under node_modules/@types.

@MarkHerhold I think you can move index.d.ts to @types/koa-body