co-debug

Better debug information for co.

co-debug turns

TypeError: You may only yield a function, promise, generator, array, or object, but the following object was passed: "undefined"
    at next (co-debug/node_modules/co/index.js:101:25)
    ...

into

TypeError: You may only yield a function, promise, generator, array, or object, but the following object was passed: "undefined"
  co-debug/test/test.js function: foo
  0: yield bar()
  1: yield Promise.resolve()
    at next (co-debug/node_modules/co/index.js:101:25)
    ...

Install

npm i co-debug

You may need to install co by yourself.

Usage

node -r co-debug

Or add require('co-debug') to your main file and make sure it's loaded before other packages:

require('co-debug')
const Koa = require('koa')
const app = new Koa()
app.use(function * () {})

Notes

co-debug has some limitations

co-debug only can tell:

• The function name that throws error
• The list of yield within the function
• The file path that contains the function

Examples:

co-debug/test/test.js function: foo
0: yield bar()
1: yield Promise.resolve()

co-debug may have trouble working with transpilers.

Only use co-debug when needed

if (process.env.NODE_ENV !== 'production') {
  require('co-debug')
}
const co = require('co')
// other stuffs