fix: (cli) remove watch boolean when false

lib/cli/command.start.ts

@@ -1,5 +1,6 @@
 import * as path from "path";
 import { existsSync } from "fs";
+import { fromJS } from "immutable";
 import * as utils from "../utils";
 import { explodeFilesArg } from "./cli-options";
 const _ = require("../lodash.custom");
@@ -51,10 +52,11 @@ export default function(opts) {
  * @returns {*}
  */
 function preprocessFlags(flags) {
-    return [stripUndefined, legacyFilesArgs].reduce(
-        (flags, fn) => fn.call(null, flags),
-        flags
-    );
+    return [
+        stripUndefined,
+        legacyFilesArgs,
+        removeWatchBooleanWhenFalse
+    ].reduce((flags, fn) => fn.call(null, flags), flags);
 }
 
 /**
@@ -87,3 +89,18 @@ function legacyFilesArgs(flags) {
     }
     return flags;
 }
+
+/**
+ * `watch` is a CLI boolean so should be removed if false to
+ * allow config to set watch: true
+ * @param flags
+ * @returns {any}
+ */
+function removeWatchBooleanWhenFalse(flags) {
+    if (flags.watch === false) {
+        return fromJS(flags)
+            .delete("watch")
+            .toJS();
+    }
+    return flags;
+}