custom-functions-metadata-plugin: type annotation is wrong

[akiomik]

custom-functions-metadata-plugin allows multiple files to be input.

https://github.com/OfficeDev/Office-Addin-Scripts/tree/master/packages/custom-functions-metadata-plugin#webpack-example-webpackconfigjs

new CustomFunctionsMetadataPlugin({
  input: [
            "./src/functions/someFunctions.js", 
            "./src/functions/otherFunctions.js"
          ], 
  output: "functions.json"
}),

The type of input in Options is string, but it should be string | string[].

Office-Addin-Scripts/packages/custom-functions-metadata-plugin/src/customfunctionsplugin.ts

Line 12 in 6b973f8

type Options = { input: string; output: string };