gulpjs / plugin-error / 38

98%

Pull #13

travis-ci

Update types to support union-type arguments

This commit updates the signature of the `PluginError` constructor to
loosen the constraints on the parameters in order to support union types
while keeping inference on custom properties.
This is a semver minor update (fix).

This allows for example to use the pattern below:
```
function createPluginError(error: Error | string) {
  return new PluginError("test", error);
}
```
(The tests were updated with more complex cases)

See the discussions in #10 and #11 for details.

- Closes gulpjs/plugin-error#10
- Closes gulpjs/plugin-error#11

/cc @gucong3000

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