Params decorator always returns undefined

[ErikMartensson]

I'm submitting a...

[ ] Regression 
[X] Bug report
[ ] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead post your question on Stack Overflow.

Current behavior

The param decorator, in my controller, is always returning undefined. I get the same result even if I try to pick out a specific parameter, like in the tutorial. The route itself works fine. I can add a POST route too with no problem.

Expected behavior

I was hoping for an object, where the only property inside would be the id parameter from the route. Alternatively, picking out a specific route parameter would extract that one only, but it doesn't work either. Like so:

@Get(':id')
findOne(@Param('id') id) {
    return `This action returns a #${id} cat`;
}

Minimal reproduction of the problem with instructions

I've been following the tutorial here down to the section about "Route parameters".

import { Controller, Get } from '@nestjs/common'

@Controller('cats')
export class CatController {
    @Get(':id')
    findOne(@Param() params) {
        console.log(params) // <- Always logs undefined for me
        return 'This action returns all cats'
    }
}

Environment

Nest version: 5.0.1

For Tooling issues:
- Node version: 11.4.0
--
- Platform: Docker container with image `node:alpine`

Others:
NPM version: 6.4.1
Pure JavaScript, cloned from the `javascript-starter` repo.

[ErikMartensson]

As it turns out, I didn't read the documentation carefully enough. A colleague of mine figured out that the example I was following is currently only supported in TypeScript and that Babel for now doesn't support decorators in function parameters (no, not even with the transform-function-parameter-decorators plugin).

So this is what solved it, binding the Param decorator to my method with the Bind decorator.

import { Controller, Bind, Get, Param } from '@nestjs/common'

@Controller('cats')
export class CatController {
    @Get(':id')
    @Bind(Param())
    findOne(params) {
        console.log(params) // <- Logs my parameters now
        return 'This action returns all cats'
    }
}

[lock[bot]]

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