Support npm/yarn linking about metro

[iddan]

This is a major issue for react native OSS package maintainers as it is very hard to test the code in example projects

[aleclarson]

Symlink support is being tracked in #1. See this comment, specifically.

[pavlos256]

I tried the rn-cli-config.js but it didn't work

For anyone else reading this, rn-cli-config.js has been renamed to metro.config.js and here's the relevant section.

Sample metro.config.js to look for mymodule in ./mymodule:

module.exports = {
    transformer: {
        getTransformOptions: async () => ({
            transform: {
                experimentalImportSupport: false,
                inlineRequires: true
            }
        })
    },
    resolver: {
        extraNodeModules: {
            "mymodule": "./"
        }
    }
};

[skovhus]

@iddan agree. But note that there is a workaround (see my rn-cli-config.js file).

[bugs181]

Just ran into this issue myself. Only my error was slightly different. Glad Google brought me here.

On iOS screen:

Metro Bundler has encountered an internal error, please check your terminal error output for more details

Terminal:

[20:58:54] undefined
[20:58:54] Failed building JavaScript bundle.

Setup:

"expo": "^29.0.0",
"react": "16.3.1",

However just prior to this I did npm link moduleName

[hosseinalipour]

I tried the rn-cli-config.js but it didn't work

[Roopbasant007]

I found a kind of bug while installing some packages related to yarn in our system if the user name is space separate string. for example, the user name is Roop Basant. It throws an error that the user is not found.