Summary:
Changed const to let, to dodge the following issue:
> "errorMessage" is read-only
> 203 | const errorMessage = `Callback with id ${cbID}: ${module}.${method}() not found`;
> 204 | if (method) {
> > 205 | errorMessage = `The callback ${method}() exists in module ${module}, `
> | ^
> 206 | + `but only one callback may be registered to a function in a native module.`;
> 207 | }
Closes https://github.com/facebook/react-native/pull/8347
Differential Revision: D3475525
Pulled By: javache
fbshipit-source-id: e03b3b3411606e6798dc42c785f847c2eda03b0c
57d85f1c3e