From 2bbd5eaef1d2550ae72f2ec2da869e8896a0c767 Mon Sep 17 00:00:00 2001
From: Antoine Veldhoven <antoineveldhoven@gmail.com>
Date: Wed, 28 May 2025 19:35:33 +0200
Subject: [PATCH 1/2] Provide PHP style output of booleans by specifying
 option.

---
 src/twig.core.js    | 12 ++++++++++++
 src/twig.exports.js |  1 +
 test/test.core.js   |  5 +++++
 3 files changed, 18 insertions(+)

diff --git a/src/twig.core.js b/src/twig.core.js
index d896d5c3..d2229c6c 100644
--- a/src/twig.core.js
+++ b/src/twig.core.js
@@ -695,6 +695,18 @@ module.exports = function (Twig) {
      */
     Twig.output = function (output) {
         const {autoescape} = this.options;
+        const {phpStyleBooleans} = this.options;
+
+        // Conform Javascript boolean to PHP boolean
+        if (phpStyleBooleans) {
+            output = output.map(str => {
+                if (typeof str === 'boolean') {
+                    str = str ? '1' : '';
+                }
+
+                return str;
+            });
+        }
 
         if (!autoescape) {
             return output.join('');
diff --git a/src/twig.exports.js b/src/twig.exports.js
index e95b33b6..5a0f85b3 100644
--- a/src/twig.exports.js
+++ b/src/twig.exports.js
@@ -23,6 +23,7 @@ module.exports = function (Twig) {
             // TODO: turn autoscape on in the next major version
             autoescape: (params.autoescape !== null && params.autoescape) || false,
             allowInlineIncludes: params.allowInlineIncludes || false,
+            phpStyleBooleans: params.phpStyleBooleans || false,
             rethrow: params.rethrow || false,
             namespaces: params.namespaces
         };
diff --git a/test/test.core.js b/test/test.core.js
index ec2b06f5..3119847f 100644
--- a/test/test.core.js
+++ b/test/test.core.js
@@ -147,6 +147,11 @@ describe('Twig.js Core ->', function () {
         twig({data: '{{ false }}'}).render().should.equal('false');
     });
 
+    it('should be able to output booleans (PHP style)', function () {
+        twig({phpStyleBooleans: true, data: '{{ false }}'}).render().should.equal('');
+        twig({phpStyleBooleans: true, data: '{{ true }}'}).render().should.equal('1');
+    });
+
     it('should be able to output strings', function () {
         twig({data: '{{ "double" }}'}).render().should.equal('double');
         twig({data: '{{ \'single\' }}'}).render().should.equal('single');

From 5220b0e2371aa65afb35ec0e82ae658da2308178 Mon Sep 17 00:00:00 2001
From: Antoine Veldhoven <antoineveldhoven@gmail.com>
Date: Mon, 2 Jun 2025 21:34:29 +0200
Subject: [PATCH 2/2] Show deprecation notice when phpStyleBooleans is not
 defined and a boolean is encountered.

Co-Authored-By: Will Rowe <willrowe@users.noreply.github.com>
---
 src/twig.core.js    | 14 ++++++++------
 src/twig.exports.js |  7 ++++++-
 2 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/src/twig.core.js b/src/twig.core.js
index d2229c6c..d75c39c2 100644
--- a/src/twig.core.js
+++ b/src/twig.core.js
@@ -698,15 +698,17 @@ module.exports = function (Twig) {
         const {phpStyleBooleans} = this.options;
 
         // Conform Javascript boolean to PHP boolean
-        if (phpStyleBooleans) {
-            output = output.map(str => {
-                if (typeof str === 'boolean') {
+        output = output.map(str => {
+            if (typeof str === 'boolean') {
+                if (phpStyleBooleans === undefined) {
+                    console.warn('Deprecation notice: `phpStyleBooleans` is not defined, output differs from PHP behavior, in future versions this behavior will be changed to PHP style booleans.');
+                } else if (phpStyleBooleans) {
                     str = str ? '1' : '';
                 }
+            }
 
-                return str;
-            });
-        }
+            return str;
+        });
 
         if (!autoescape) {
             return output.join('');
diff --git a/src/twig.exports.js b/src/twig.exports.js
index 5a0f85b3..497a29e9 100644
--- a/src/twig.exports.js
+++ b/src/twig.exports.js
@@ -23,7 +23,8 @@ module.exports = function (Twig) {
             // TODO: turn autoscape on in the next major version
             autoescape: (params.autoescape !== null && params.autoescape) || false,
             allowInlineIncludes: params.allowInlineIncludes || false,
-            phpStyleBooleans: params.phpStyleBooleans || false,
+            // TODO: turn phpStyleBooleans on in the next major version
+            phpStyleBooleans: undefined,
             rethrow: params.rethrow || false,
             namespaces: params.namespaces
         };
@@ -40,6 +41,10 @@ module.exports = function (Twig) {
             Twig.trace = params.trace;
         }
 
+        if (params.phpStyleBooleans !== undefined) {
+            options.phpStyleBooleans = params.phpStyleBooleans;
+        }
+
         if (params.data !== undefined) {
             return Twig.Templates.parsers.twig({
                 data: params.data,