CacheControl / esm-config-tostring-bug

esm config toString

Behavior

Running an esm based application that has an esm based package w/a config package as a dependency, an error is thrown.

• problem occurs when importing a package using esm and config, into an application also using esm
• occurs when both app and package are on 3.0.20

⇒  npm run start

> esm-app3@1.0.0 start /Users/chamm/esm-nyc-bug/esm-app
> node -r esm index.js

/Users/chamm/esm-nyc-bug/esm-package/node_modules/config/lib/config.js:1
TypeError: Function.prototype.toString requires that 'this' be a Function
    at Proxy.toString (<anonymous>)
    at Function.keys (<anonymous>)

Usage

# initialize the esm package
cd esm-package;
npm install;
npm link;

# initalize consuming app
cd esm-app
npm install;
npm link esm-package;
npm run start  # throws error: Function.prototype.toString requires that 'this' be a Function