Declare explicitly the --watch option on invoke (#257)

Author: mnapoli

Diff for: src/Serverless.d.ts

@@ -46,7 +46,24 @@ declare namespace Serverless {
     individually?: boolean
   }
 
+  type CommandsDefinition = Record<
+      string,
+      {
+        lifecycleEvents?: string[]
+        commands?: CommandsDefinition
+        usage?: string
+        options?: {
+          [name: string]: {
+            type: string
+            usage: string
+            required?: boolean
+            shortcut?: string
+          }
+        }
+      }
+      >
+
   interface PluginManager {
     spawn(command: string): Promise<void>
   }
-}
+}

Diff for: src/index.ts

@@ -16,11 +16,27 @@ export class TypeScriptPlugin {
   serverless: Serverless.Instance
   options: Serverless.Options
   hooks: { [key: string]: Function }
+  commands: Serverless.CommandsDefinition
 
   constructor(serverless: Serverless.Instance, options: Serverless.Options) {
     this.serverless = serverless
     this.options = options
 
+    this.commands = {
+      invoke: {
+        commands: {
+          local: {
+            options: {
+              watch: {
+                type: 'boolean',
+                usage: 'Watch file changes and re-invoke automatically the function'
+              }
+            }
+          }
+        }
+      }
+    }
+
     this.hooks = {
       'before:run:run': async () => {
         await this.compileTs()