From 10f3703e0abdbf2c90b1326ca3e44412cb61ed1a Mon Sep 17 00:00:00 2001
From: Dale 'Ducky' Lotts <dlotts@knightrider.com>
Date: Mon, 4 Nov 2019 11:15:56 -0500
Subject: [PATCH] fix: fix maximum call stack size exceeded with `ng build
 --prod`

Fix #440
---
 .travis.yml                                              | 5 ++---
 .../dl-date-time-input/dl-date-time-input.directive.ts   | 9 ++-------
 2 files changed, 4 insertions(+), 10 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index f8d22ab8..36a068a2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,9 +7,8 @@ notifications:
   email: false
 node_js:
   - '10'
-before_install:
-  - export DISPLAY=:99.0
-  - sh -e /etc/init.d/xvfb start
+services:
+  - xvfb
 before_script:
   - npm prune
 script:
diff --git a/src/lib/dl-date-time-input/dl-date-time-input.directive.ts b/src/lib/dl-date-time-input/dl-date-time-input.directive.ts
index a276c0b1..ee1c0e93 100644
--- a/src/lib/dl-date-time-input/dl-date-time-input.directive.ts
+++ b/src/lib/dl-date-time-input/dl-date-time-input.directive.ts
@@ -18,11 +18,6 @@ import {DlDateTimeInputChange} from './dl-date-time-input-change';
  */
 const moment = _moment;
 
-/**
- * @internal
- */
-const alwaysTrueInputFilter: (value: any) => boolean = () => true;
-
 /**
  *  This directive allows the user to enter dates, using the keyboard, into an input box and
  *  angular will then store a date value in the model.
@@ -40,10 +35,10 @@ export class DlDateTimeInputDirective<D> implements ControlValueAccessor, Valida
 
   /* tslint:disable:member-ordering */
   private _filterValidator: ValidatorFn = (control: AbstractControl): ValidationErrors | null => {
-    return (this._inputFilter || alwaysTrueInputFilter)(this._value) ?
+    return (this._inputFilter || (() => true))(this._value) ?
       null : {'dlDateTimeInputFilter': {'value': control.value}};
   }
-  private _inputFilter: (value: (D | null)) => boolean = alwaysTrueInputFilter;
+  private _inputFilter: (value: (D | null)) => boolean = () => true;
   private _isValid = true;
   private _parseValidator: ValidatorFn = (): ValidationErrors | null => {
     return this._isValid ?