Pull in the latest code from Go's template packages (#11771)

Fixes #10707
Fixes #11507

25 files changed, 417 insertions, 190 deletions

diff --git a/config/allconfig/load.go b/config/allconfig/load.go
index e7dae1806..7d706c7e3 100644
--- a/config/allconfig/load.go
+++ b/config/allconfig/load.go
@@ -34,7 +34,6 @@ import (
 	hglob "github.com/gohugoio/hugo/hugofs/glob"
 	"github.com/gohugoio/hugo/modules"
 	"github.com/gohugoio/hugo/parser/metadecoders"
-	"github.com/gohugoio/hugo/tpl"
 	"github.com/spf13/afero"
 )
 
@@ -91,9 +90,6 @@ func LoadConfig(d ConfigSourceDescriptor) (*Configs, error) {
 		return nil, fmt.Errorf("failed to init config: %w", err)
 	}
 
-	// This is unfortunate, but these are global settings.
-	tpl.SetSecurityAllowActionJSTmpl(configs.Base.Security.GoTemplates.AllowActionJSTmpl)
-
 	loggers.InitGlobalLogger(d.Logger.Level(), configs.Base.PanicOnWarning)
 
 	return configs, nil
diff --git a/config/security/securityConfig.go b/config/security/securityConfig.go
index 16f8c23d8..e3bffedca 100644
--- a/config/security/securityConfig.go
+++ b/config/security/securityConfig.go
@@ -68,9 +68,6 @@ type Config struct {
 
 	// Allow inline shortcodes
 	EnableInlineShortcodes bool `json:"enableInlineShortcodes"`
-
-	// Go templates related security config.
-	GoTemplates GoTemplates `json:"goTemplates"`
 }
 
 // Exec holds os/exec policies.
@@ -96,15 +93,6 @@ type HTTP struct {
 	MediaTypes Whitelist `json:"mediaTypes"`
 }
 
-type GoTemplates struct {
-
-	// Enable to allow template actions inside bakcticks in ES6 template literals.
-	// This was blocked in Hugo 0.114.0 for security reasons and you now get errors on the form
-	// "... appears in a JS template literal" if you have this in your templates.
-	// See https://github.com/golang/go/issues/59234
-	AllowActionJSTmpl bool
-}
-
 // ToTOML converts c to TOML with [security] as the root.
 func (c Config) ToTOML() string {
 	sec := c.ToSecurityMap()
@@ -127,7 +115,6 @@ func (c Config) CheckAllowedExec(name string) error {
 		}
 	}
 	return nil
-
 }
 
 func (c Config) CheckAllowedGetEnv(name string) error {
@@ -176,7 +163,6 @@ func (c Config) ToSecurityMap() map[string]any {
 		"security": m,
 	}
 	return sec
-
 }
 
 // DecodeConfig creates a privacy Config from a given Hugo configuration.
@@ -206,15 +192,14 @@ func DecodeConfig(cfg config.Provider) (Config, error) {
 	}
 
 	return sc, nil
-
 }
 
 func stringSliceToWhitelistHook() mapstructure.DecodeHookFuncType {
 	return func(
 		f reflect.Type,
 		t reflect.Type,
-		data any) (any, error) {
-
+		data any,
+	) (any, error) {
 		if t != reflect.TypeOf(Whitelist{}) {
 			return data, nil
 		}
@@ -222,7 +207,6 @@ func stringSliceToWhitelistHook() mapstructure.DecodeHookFuncType {
 		wl := types.ToStringSlicePreserveString(data)
 
 		return NewWhitelist(wl...)
-
 	}
 }
 
diff --git a/config/security/securityConfig_test.go b/config/security/securityConfig_test.go
index cdfbe6341..3d58288c9 100644
--- a/config/security/securityConfig_test.go
+++ b/config/security/securityConfig_test.go
@@ -53,7 +53,6 @@ getEnv=["a", "b"]
 		c.Assert(pc.Exec.OsEnv.Accept("e"), qt.IsFalse)
 		c.Assert(pc.Funcs.Getenv.Accept("a"), qt.IsTrue)
 		c.Assert(pc.Funcs.Getenv.Accept("c"), qt.IsFalse)
-
 	})
 
 	c.Run("String whitelist", func(c *qt.C) {
@@ -80,7 +79,6 @@ osEnv="b"
 		c.Assert(pc.Exec.Allow.Accept("d"), qt.IsFalse)
 		c.Assert(pc.Exec.OsEnv.Accept("b"), qt.IsTrue)
 		c.Assert(pc.Exec.OsEnv.Accept("e"), qt.IsFalse)
-
 	})
 
 	c.Run("Default exec.osEnv", func(c *qt.C) {
@@ -105,7 +103,6 @@ allow="a"
 		c.Assert(pc.Exec.Allow.Accept("a"), qt.IsTrue)
 		c.Assert(pc.Exec.OsEnv.Accept("PATH"), qt.IsTrue)
 		c.Assert(pc.Exec.OsEnv.Accept("e"), qt.IsFalse)
-
 	})
 
 	c.Run("Enable inline shortcodes, legacy", func(c *qt.C) {
@@ -129,9 +126,7 @@ osEnv="b"
 		pc, err := DecodeConfig(cfg)
 		c.Assert(err, qt.IsNil)
 		c.Assert(pc.EnableInlineShortcodes, qt.IsTrue)
-
 	})
-
 }
 
 func TestToTOML(t *testing.T) {
@@ -140,7 +135,7 @@ func TestToTOML(t *testing.T) {
 	got := DefaultConfig.ToTOML()
 
 	c.Assert(got, qt.Equals,
-		"[security]\n  enableInlineShortcodes = false\n\n  [security.exec]\n    allow = ['^(dart-)?sass(-embedded)?$', '^go$', '^npx$', '^postcss$']\n    osEnv = ['(?i)^((HTTPS?|NO)_PROXY|PATH(EXT)?|APPDATA|TE?MP|TERM|GO\\w+|(XDG_CONFIG_)?HOME|USERPROFILE|SSH_AUTH_SOCK|DISPLAY|LANG)$']\n\n  [security.funcs]\n    getenv = ['^HUGO_', '^CI$']\n\n  [security.goTemplates]\n    AllowActionJSTmpl = false\n\n  [security.http]\n    methods = ['(?i)GET|POST']\n    urls = ['.*']",
+		"[security]\n  enableInlineShortcodes = false\n\n  [security.exec]\n    allow = ['^(dart-)?sass(-embedded)?$', '^go$', '^npx$', '^postcss$']\n    osEnv = ['(?i)^((HTTPS?|NO)_PROXY|PATH(EXT)?|APPDATA|TE?MP|TERM|GO\\w+|(XDG_CONFIG_)?HOME|USERPROFILE|SSH_AUTH_SOCK|DISPLAY|LANG)$']\n\n  [security.funcs]\n    getenv = ['^HUGO_', '^CI$']\n\n  [security.http]\n    methods = ['(?i)GET|POST']\n    urls = ['.*']",
 	)
 }
 
@@ -169,5 +164,4 @@ func TestDecodeConfigDefault(t *testing.T) {
 	c.Assert(pc.Exec.OsEnv.Accept("a"), qt.IsFalse)
 	c.Assert(pc.Exec.OsEnv.Accept("e"), qt.IsFalse)
 	c.Assert(pc.Exec.OsEnv.Accept("MYSECRET"), qt.IsFalse)
-
 }
diff --git a/scripts/fork_go_templates/main.go b/scripts/fork_go_templates/main.go
index 4ab89a547..8e14813ec 100644
--- a/scripts/fork_go_templates/main.go
+++ b/scripts/fork_go_templates/main.go
@@ -16,7 +16,7 @@ import (
 )
 
 func main() {
-	// The current is built with 2c1e5b05fe39fc5e6c730dd60e82946b8e67c6ba, tag: go1.21.1.
+	// The current is built with 446a5dcf5a3230ce9832682d8f521071d8a34a2b (go 1.22 dev. Thu Oct 5 12:20:11 2023 -0700)
 	fmt.Println("Forking ...")
 	defer fmt.Println("Done ...")
 
diff --git a/tpl/internal/go_templates/fmtsort/sort_test.go b/tpl/internal/go_templates/fmtsort/sort_test.go
index 064b09107..fef952fa6 100644
--- a/tpl/internal/go_templates/fmtsort/sort_test.go
+++ b/tpl/internal/go_templates/fmtsort/sort_test.go
@@ -6,13 +6,14 @@ package fmtsort_test
 
 import (
 	"fmt"
-	"github.com/gohugoio/hugo/tpl/internal/go_templates/fmtsort"
 	"math"
 	"reflect"
 	"sort"
 	"strings"
 	"testing"
 	"unsafe"
+
+	"github.com/gohugoio/hugo/tpl/internal/go_templates/fmtsort"
 )
 
 var compareTests = [][]reflect.Value{
@@ -38,7 +39,7 @@ var compareTests = [][]reflect.Value{
 	ct(reflect.TypeOf(chans[0]), chans[0], chans[1], chans[2]),
 	ct(reflect.TypeOf(toy{}), toy{0, 1}, toy{0, 2}, toy{1, -1}, toy{1, 1}),
 	ct(reflect.TypeOf([2]int{}), [2]int{1, 1}, [2]int{1, 2}, [2]int{2, 0}),
-	ct(reflect.TypeOf(any(any(0))), iFace, 1, 2, 3),
+	ct(reflect.TypeOf(any(0)), iFace, 1, 2, 3),
 }
 
 var iFace any
@@ -190,12 +191,15 @@ func sprintKey(key reflect.Value) string {
 var (
 	ints  [3]int
 	chans = makeChans()
+	// pin   runtime.Pinner
 )
 
 func makeChans() []chan int {
 	cs := []chan int{make(chan int), make(chan int), make(chan int)}
 	// Order channels by address. See issue #49431.
-	// TODO: pin these pointers once pinning is available (#46787).
+	for i := range cs {
+		reflect.ValueOf(cs[i]).UnsafePointer()
+	}
 	sort.Slice(cs, func(i, j int) bool {
 		return uintptr(reflect.ValueOf(cs[i]).UnsafePointer()) < uintptr(reflect.ValueOf(cs[j]).UnsafePointer())
 	})
diff --git a/tpl/internal/go_templates/htmltemplate/context.go b/tpl/internal/go_templates/htmltemplate/context.go
index 061f17ddb..3acb9bdf0 100644
--- a/tpl/internal/go_templates/htmltemplate/context.go
+++ b/tpl/internal/go_templates/htmltemplate/context.go
@@ -22,10 +22,15 @@ type context struct {
 	delim   delim
 	urlPart urlPart
 	jsCtx   jsCtx
-	attr    attr
-	element element
-	n       parse.Node // for range break/continue
-	err     *Error
+	// jsBraceDepth contains the current depth, for each JS template literal
+	// string interpolation expression, of braces we've seen. This is used to
+	// determine if the next } will close a JS template literal string
+	// interpolation expression or not.
+	jsBraceDepth []int
+	attr         attr
+	element      element
+	n            parse.Node // for range break/continue
+	err          *Error
 }
 
 func (c context) String() string {
@@ -121,8 +126,8 @@ const (
 	stateJSDqStr
 	// stateJSSqStr occurs inside a JavaScript single quoted string.
 	stateJSSqStr
-	// stateJSBqStr occurs inside a JavaScript back quoted string.
-	stateJSBqStr
+	// stateJSTmplLit occurs inside a JavaScript back quoted string.
+	stateJSTmplLit
 	// stateJSRegexp occurs inside a JavaScript regexp literal.
 	stateJSRegexp
 	// stateJSBlockCmt occurs inside a JavaScript /* block comment */.
@@ -176,14 +181,14 @@ func isInTag(s state) bool {
 }
 
 // isInScriptLiteral returns true if s is one of the literal states within a
-// <script> tag, and as such occurances of "<!--", "<script", and "</script"
+// <script> tag, and as such occurrences of "<!--", "<script", and "</script"
 // need to be treated specially.
 func isInScriptLiteral(s state) bool {
 	// Ignore the comment states (stateJSBlockCmt, stateJSLineCmt,
 	// stateJSHTMLOpenCmt, stateJSHTMLCloseCmt) because their content is already
 	// omitted from the output.
 	switch s {
-	case stateJSDqStr, stateJSSqStr, stateJSBqStr, stateJSRegexp:
+	case stateJSDqStr, stateJSSqStr, stateJSTmplLit, stateJSRegexp:
 		return true
 	}
 	return false
diff --git a/tpl/internal/go_templates/htmltemplate/error.go b/tpl/internal/go_templates/htmltemplate/error.go
index a4450a4a9..de4b4de1e 100644
--- a/tpl/internal/go_templates/htmltemplate/error.go
+++ b/tpl/internal/go_templates/htmltemplate/error.go
@@ -222,6 +222,10 @@ const (
 	// Discussion:
 	//   Package html/template does not support actions inside of JS template
 	//   literals.
+	//
+	// Deprecated: ErrJSTemplate is no longer returned when an action is present
+	// in a JS template literal. Actions inside of JS template literals are now
+	// escaped as expected.
 	ErrJSTemplate
 )
 
diff --git a/tpl/internal/go_templates/htmltemplate/escape.go b/tpl/internal/go_templates/htmltemplate/escape.go
index 5d47a83d3..334bbce0f 100644
--- a/tpl/internal/go_templates/htmltemplate/escape.go
+++ b/tpl/internal/go_templates/htmltemplate/escape.go
@@ -8,8 +8,6 @@ import (
 	"bytes"
 	"fmt"
 	"html"
-
-	//"internal/godebug"
 	"io"
 	"regexp"
 
@@ -64,22 +62,23 @@ func evalArgs(args ...any) string {
 
 // funcMap maps command names to functions that render their inputs safe.
 var funcMap = template.FuncMap{
-	"_html_template_attrescaper":     attrEscaper,
-	"_html_template_commentescaper":  commentEscaper,
-	"_html_template_cssescaper":      cssEscaper,
-	"_html_template_cssvaluefilter":  cssValueFilter,
-	"_html_template_htmlnamefilter":  htmlNameFilter,
-	"_html_template_htmlescaper":     htmlEscaper,
-	"_html_template_jsregexpescaper": jsRegexpEscaper,
-	"_html_template_jsstrescaper":    jsStrEscaper,
-	"_html_template_jsvalescaper":    jsValEscaper,
-	"_html_template_nospaceescaper":  htmlNospaceEscaper,
-	"_html_template_rcdataescaper":   rcdataEscaper,
-	"_html_template_srcsetescaper":   srcsetFilterAndEscaper,
-	"_html_template_urlescaper":      urlEscaper,
-	"_html_template_urlfilter":       urlFilter,
-	"_html_template_urlnormalizer":   urlNormalizer,
-	"_eval_args_":                    evalArgs,
+	"_html_template_attrescaper":      attrEscaper,
+	"_html_template_commentescaper":   commentEscaper,
+	"_html_template_cssescaper":       cssEscaper,
+	"_html_template_cssvaluefilter":   cssValueFilter,
+	"_html_template_htmlnamefilter":   htmlNameFilter,
+	"_html_template_htmlescaper":      htmlEscaper,
+	"_html_template_jsregexpescaper":  jsRegexpEscaper,
+	"_html_template_jsstrescaper":     jsStrEscaper,
+	"_html_template_jstmpllitescaper": jsTmplLitEscaper,
+	"_html_template_jsvalescaper":     jsValEscaper,
+	"_html_template_nospaceescaper":   htmlNospaceEscaper,
+	"_html_template_rcdataescaper":    rcdataEscaper,
+	"_html_template_srcsetescaper":    srcsetFilterAndEscaper,
+	"_html_template_urlescaper":       urlEscaper,
+	"_html_template_urlfilter":        urlFilter,
+	"_html_template_urlnormalizer":    urlNormalizer,
+	"_eval_args_":                     evalArgs,
 }
 
 // escaper collects type inferences about templates and changes needed to make
@@ -164,7 +163,6 @@ func (e *escaper) escape(c context, n parse.Node) context {
 	panic("escaping " + n.String() + " is unimplemented")
 }
 
-// Modified by Hugo.
 // var debugAllowActionJSTmpl = godebug.New("jstmpllitinterp")
 
 // escapeAction escapes an action template node.
@@ -230,16 +228,8 @@ func (e *escaper) escapeAction(c context, n *parse.ActionNode) context {
 		c.jsCtx = jsCtxDivOp
 	case stateJSDqStr, stateJSSqStr:
 		s = append(s, "_html_template_jsstrescaper")
-	case stateJSBqStr:
-		if SecurityAllowActionJSTmpl.Load() {
-			// debugAllowActionJSTmpl.IncNonDefault()
-			s = append(s, "_html_template_jsstrescaper")
-		} else {
-			return context{
-				state: stateError,
-				err:   errorf(ErrJSTemplate, n, n.Line, "%s appears in a JS template literal", n),
-			}
-		}
+	case stateJSTmplLit:
+		s = append(s, "_html_template_jstmpllitescaper")
 	case stateJSRegexp:
 		s = append(s, "_html_template_jsregexpescaper")
 	case stateCSS:
@@ -398,6 +388,9 @@ var redundantFuncs = map[string]map[string]bool{
 	"_html_template_jsstrescaper": {
 		"_html_template_attrescaper": true,
 	},
+	"_html_template_jstmpllitescaper": {
+		"_html_template_attrescaper": true,
+	},
 	"_html_template_urlescaper": {
 		"_html_template_urlnormalizer": true,
 	},
diff --git a/tpl/internal/go_templates/htmltemplate/escape_test.go b/tpl/internal/go_templates/htmltemplate/escape_test.go
index 4ad5316fb..b202afde0 100644
--- a/tpl/internal/go_templates/htmltemplate/escape_test.go
+++ b/tpl/internal/go_templates/htmltemplate/escape_test.go
@@ -35,14 +35,14 @@ func (x *goodMarshaler) MarshalJSON() ([]byte, error) {
 
 func TestEscape(t *testing.T) {
 	data := struct {
-		F, T    bool
-		C, G, H string
-		A, E    []string
-		B, M    json.Marshaler
-		N       int
-		U       any  // untyped nil
-		Z       *int // typed nil
-		W       htmltemplate.HTML
+		F, T       bool
+		C, G, H, I string
+		A, E       []string
+		B, M       json.Marshaler
+		N          int
+		U          any  // untyped nil
+		Z          *int // typed nil
+		W          htmltemplate.HTML
 	}{
 		F: false,
 		T: true,
@@ -57,6 +57,7 @@ func TestEscape(t *testing.T) {
 		U: nil,
 		Z: nil,
 		W: htmltemplate.HTML(`&iexcl;<b class="foo">Hello</b>, <textarea>O'World</textarea>!`),
+		I: "${ asd `` }",
 	}
 	pdata := &data
 
@@ -723,6 +724,21 @@ func TestEscape(t *testing.T) {
 			"<p name=\"{{.U}}\">",
 			"<p name=\"\">",
 		},
+		{
+			"JS template lit special characters",
+			"<script>var a = `{{.I}}`</script>",
+			"<script>var a = `\\u0024\\u007b asd \\u0060\\u0060 \\u007d`</script>",
+		},
+		{
+			"JS template lit special characters, nested lit",
+			"<script>var a = `${ `{{.I}}` }`</script>",
+			"<script>var a = `${ `\\u0024\\u007b asd \\u0060\\u0060 \\u007d` }`</script>",
+		},
+		{
+			"JS template lit, nested JS",
+			"<script>var a = `${ var a = \"{{\"a \\\" d\"}}\" }`</script>",
+			"<script>var a = `${ var a = \"a \\u0022 d\" }`</script>",
+		},
 	}
 
 	for _, test := range tests {
@@ -981,6 +997,31 @@ func TestErrors(t *testing.T) {
 			"<script>var a = `${a+b}`</script>`",
 			"",
 		},
+		{
+			"<script>var tmpl = `asd`;</script>",
+			``,
+		},
+		{
+			"<script>var tmpl = `${1}`;</script>",
+			``,
+		},
+		{
+			"<script>var tmpl = `${return ``}`;</script>",
+			``,
+		},
+		{
+			"<script>var tmpl = `${return {{.}} }`;</script>",
+			``,
+		},
+		{
+			"<script>var tmpl = `${ let a = {1:1} {{.}} }`;</script>",
+			``,
+		},
+		{
+			"<script>var tmpl = `asd ${return \"{\"}`;</script>",
+			``,
+		},
+
 		// Error cases.
 		{
 			"{{if .Cond}}<a{{end}}",
@@ -1127,10 +1168,6 @@ func TestErrors(t *testing.T) {
 			// html is allowed since it is the last command in the pipeline, but urlquery is not.
 			`predefined escaper "urlquery" disallowed in template`,
 		},
-		{
-			"<script>var tmpl = `asd {{.}}`;</script>",
-			`{{.}} appears in a JS template literal`,
-		},
 	}
 	for _, test := range tests {
 		buf := new(bytes.Buffer)
@@ -1354,7 +1391,7 @@ func TestEscapeText(t *testing.T) {
 		},
 		{
 			"<a onclick=\"`foo",
-			context{state: stateJSBqStr, delim: delimDoubleQuote, attr: attrScript},
+			context{state: stateJSTmplLit, delim: delimDoubleQuote, attr: attrScript},
 		},
 		{
 			`<A ONCLICK="'`,
@@ -1696,6 +1733,94 @@ func TestEscapeText(t *testing.T) {
 			`<svg:a svg:onclick="x()">`,
 			context{},
 		},
+		{
+			"<script>var a = `",
+			context{state: stateJSTmplLit, element: elementScript},
+		},
+		{
+			"<script>var a = `${",
+			context{state: stateJS, element: elementScript},
+		},
+		{
+			"<script>var a = `${}",
+			context{state: stateJSTmplLit, element: elementScript},
+		},
+		{
+			"<script>var a = `${`",
+			context{state: stateJSTmplLit, element: elementScript},
+		},
+		{
+			"<script>var a = `${var a = \"",
+			context{state: stateJSDqStr, element: elementScript},
+		},
+		{
+			"<script>var a = `${var a = \"`",
+			context{state: stateJSDqStr, element: elementScript},
+		},
+		{
+			"<script>var a = `${var a = \"}",
+			context{state: stateJSDqStr, element: elementScript},
+		},
+		{
+			"<script>var a = `${``",
+			context{state: stateJS, element: elementScript},
+		},
+		{
+			"<script>var a = `${`}",
+			context{state: stateJSTmplLit, element: elementScript},
+		},
+		{
+			"<script>`${ {} } asd`</script><script>`${ {} }",
+			context{state: stateJSTmplLit, element: elementScript},
+		},
+		{
+			"<script>var foo = `${ (_ => { return \"x\" })() + \"${",
+			context{state: stateJSDqStr, element: elementScript},
+		},
+		{
+			"<script>var a = `${ {</script><script>var b = `${ x }",
+			context{state: stateJSTmplLit, element: elementScript, jsCtx: jsCtxDivOp},
+		},
+		{
+			"<script>var foo = `x` + \"${",
+			context{state: stateJSDqStr, element: elementScript},
+		},
+		{
+			"<script>function f() { var a = `${}`; }",
+			context{state: stateJS, element: elementScript},
+		},
+		{
+			"<script>{`${}`}",
+			context{state: stateJS, element: elementScript},
+		},
+		{
+			"<script>`${ function f() { return `${1}` }() }`",
+			context{state: stateJS, element: elementScript, jsCtx: jsCtxDivOp},
+		},
+		{
+			"<script>function f() {`${ function f() { `${1}` } }`}",
+			context{state: stateJS, element: elementScript, jsCtx: jsCtxDivOp},
+		},
+		{
+			"<script>`${ { `` }",
+			context{state: stateJS, element: elementScript},
+		},
+		{
+			"<script>`${ { }`",
+			context{state: stateJSTmplLit, element: elementScript},
+		},
+		{
+			"<script>var foo = `${ foo({ a: { c: `${",
+			context{state: stateJS, element: elementScript},
+		},
+		{
+			"<script>var foo = `${ foo({ a: { c: `${ {{.}} }` }, b: ",
+			context{state: stateJS, element: elementScript},
+		},
+		{
+			"<script>`${ `}",
+			context{state: stateJSTmplLit, element: elementScript},
+		},
 	}
 
 	for _, test := range tests {
diff --git a/tpl/internal/go_templates/htmltemplate/exec_test.go b/tpl/internal/go_templates/htmltemplate/exec_test.go
index 8f9b893b4..e91aeafa1 100644
--- a/tpl/internal/go_templates/htmltemplate/exec_test.go
+++ b/tpl/internal/go_templates/htmltemplate/exec_test.go
@@ -325,12 +325,16 @@ var execTests = []execTest{
 	{"$.U.V", "{{$.U.V}}", "v", tVal, true},
 	{"declare in action", "{{$x := $.U.V}}{{$x}}", "v", tVal, true},
 	{"simple assignment", "{{$x := 2}}{{$x = 3}}{{$x}}", "3", tVal, true},
-	{"nested assignment",
+	{
+		"nested assignment",
 		"{{$x := 2}}{{if true}}{{$x = 3}}{{end}}{{$x}}",
-		"3", tVal, true},
-	{"nested assignment changes the last declaration",
+		"3", tVal, true,
+	},
+	{
+		"nested assignment changes the last declaration",
 		"{{$x := 1}}{{if true}}{{$x := 2}}{{if true}}{{$x = 3}}{{end}}{{end}}{{$x}}",
-		"1", tVal, true},
+		"1", tVal, true,
+	},
 
 	// Type with String method.
 	{"V{6666}.String()", "-{{.V0}}-", "-{6666}-", tVal, true}, //  NOTE: -<6666>- in text/template
@@ -377,15 +381,21 @@ var execTests = []execTest{
 	{".Method3(nil constant)", "-{{.Method3 nil}}-", "-Method3: &lt;nil&gt;-", tVal, true},
 	{".Method3(nil value)", "-{{.Method3 .MXI.unset}}-", "-Method3: &lt;nil&gt;-", tVal, true},
 	{"method on var", "{{if $x := .}}-{{$x.Method2 .U16 $x.X}}{{end}}-", "-Method2: 16 x-", tVal, true},
-	{"method on chained var",
+	{
+		"method on chained var",
 		"{{range .MSIone}}{{if $.U.TrueFalse $.True}}{{$.U.TrueFalse $.True}}{{else}}WRONG{{end}}{{end}}",
-		"true", tVal, true},
-	{"chained method",
+		"true", tVal, true,
+	},
+	{
+		"chained method",
 		"{{range .MSIone}}{{if $.GetU.TrueFalse $.True}}{{$.U.TrueFalse $.True}}{{else}}WRONG{{end}}{{end}}",
-		"true", tVal, true},
-	{"chained method on variable",
+		"true", tVal, true,
+	},
+	{
+		"chained method on variable",
 		"{{with $x := .}}{{with .SI}}{{$.GetU.TrueFalse $.True}}{{end}}{{end}}",
-		"true", tVal, true},
+		"true", tVal, true,
+	},
 	{".NilOKFunc not nil", "{{call .NilOKFunc .PI}}", "false", tVal, true},
 	{".NilOKFunc nil", "{{call .NilOKFunc nil}}", "true", tVal, true},
 	{"method on nil value from slice", "-{{range .}}{{.Method1 1234}}{{end}}-", "-1234-", tSliceOfNil, true},
@@ -471,10 +481,14 @@ var execTests = []execTest{
 	{"printf lots", `{{printf "%d %s %g %s" 127 "hello" 7-3i .Method0}}`, "127 hello (7-3i) M0", tVal, true},
 
 	// HTML.
-	{"html", `{{html "<script>alert(\"XSS\");</script>"}}`,
-		"&lt;script&gt;alert(&#34;XSS&#34;);&lt;/script&gt;", nil, true},
-	{"html pipeline", `{{printf "<script>alert(\"XSS\");</script>" | html}}`,
-		"&lt;script&gt;alert(&#34;XSS&#34;);&lt;/script&gt;", nil, true},
+	{
+		"html", `{{html "<script>alert(\"XSS\");</script>"}}`,
+		"&lt;script&gt;alert(&#34;XSS&#34;);&lt;/script&gt;", nil, true,
+	},
+	{
+		"html pipeline", `{{printf "<script>alert(\"XSS\");</script>" | html}}`,
+		"&lt;script&gt;alert(&#34;XSS&#34;);&lt;/script&gt;", nil, true,
+	},
 	{"html", `{{html .PS}}`, "a string", tVal, true},
 	{"html typed nil", `{{html .NIL}}`, "&lt;nil&gt;", tVal, true},
 	{"html untyped nil", `{{html .Empty0}}`, "&lt;nil&gt;", tVal, true}, // NOTE: "&lt;no value&gt;" in text/template
@@ -838,7 +852,7 @@ var delimPairs = []string{
 
 func TestDelims(t *testing.T) {
 	const hello = "Hello, world"
-	var value = struct{ Str string }{hello}
+	value := struct{ Str string }{hello}
 	for i := 0; i < len(delimPairs); i += 2 {
 		text := ".Str"
 		left := delimPairs[i+0]
@@ -861,7 +875,7 @@ func TestDelims(t *testing.T) {
 		if err != nil {
 			t.Fatalf("delim %q text %q parse err %s", left, text, err)
 		}
-		var b = new(strings.Builder)
+		b := new(strings.Builder)
 		err = tmpl.Execute(b, value)
 		if err != nil {
 			t.Fatalf("delim %q exec err %s", left, err)
@@ -962,7 +976,7 @@ const treeTemplate = `
 `
 
 func TestTree(t *testing.T) {
-	var tree = &Tree{
+	tree := &Tree{
 		1,
 		&Tree{
 			2, &Tree{
@@ -1213,7 +1227,7 @@ var cmpTests = []cmpTest{
 
 func TestComparison(t *testing.T) {
 	b := new(strings.Builder)
-	var cmpStruct = struct {
+	cmpStruct := struct {
 		Uthree, Ufour  uint
 		NegOne, Three  int
 		Ptr, NilPtr    *int
diff --git a/tpl/internal/go_templates/htmltemplate/hugo_template.go b/tpl/internal/go_templates/htmltemplate/hugo_template.go
index 98e03ad3c..99edf8f68 100644
--- a/tpl/internal/go_templates/htmltemplate/hugo_template.go
+++ b/tpl/internal/go_templates/htmltemplate/hugo_template.go
@@ -14,15 +14,9 @@
 package template
 
 import (
-	"sync/atomic"
-
 	template "github.com/gohugoio/hugo/tpl/internal/go_templates/texttemplate"
 )
 
-// See https://github.com/golang/go/issues/59234
-// Moved here to avoid dependency on Go's internal/debug package.
-var SecurityAllowActionJSTmpl atomic.Bool
-
 /*
 
 This files contains the Hugo related addons. All the other files in this
diff --git a/tpl/internal/go_templates/htmltemplate/js.go b/tpl/internal/go_templates/htmltemplate/js.go
index 3b5178eb1..79d9102e5 100644
--- a/tpl/internal/go_templates/htmltemplate/js.go
+++ b/tpl/internal/go_templates/htmltemplate/js.go
@@ -239,6 +239,11 @@ func jsStrEscaper(args ...any) string {
 	return replace(s, jsStrReplacementTable)
 }
 
+func jsTmplLitEscaper(args ...any) string {
+	s, _ := stringify(args...)
+	return replace(s, jsBqStrReplacementTable)
+}
+
 // jsRegexpEscaper behaves like jsStrEscaper but escapes regular expression
 // specials so the result is treated literally when included in a regular
 // expression literal. /foo{{.X}}bar/ matches the string "foo" followed by
@@ -325,6 +330,31 @@ var jsStrReplacementTable = []string{
 	'\\': `\\`,
 }
 
+// jsBqStrReplacementTable is like jsStrReplacementTable except it also contains
+// the special characters for JS template literals: $, {, and }.
+var jsBqStrReplacementTable = []string{
+	0:    `\u0000`,
+	'\t': `\t`,
+	'\n': `\n`,
+	'\v': `\u000b`, // "\v" == "v" on IE 6.
+	'\f': `\f`,
+	'\r': `\r`,
+	// Encode HTML specials as hex so the output can be embedded
+	// in HTML attributes without further encoding.
+	'"':  `\u0022`,
+	'`':  `\u0060`,
+	'&':  `\u0026`,
+	'\'': `\u0027`,
+	'+':  `\u002b`,
+	'/':  `\/`,
+	'<':  `\u003c`,
+	'>':  `\u003e`,
+	'\\': `\\`,
+	'$':  `\u0024`,
+	'{':  `\u007b`,
+	'}':  `\u007d`,
+}
+
 // jsStrNormReplacementTable is like jsStrReplacementTable but does not
 // overencode existing escapes since this table has no entry for `\`.
 var jsStrNormReplacementTable = []string{
@@ -345,6 +375,7 @@ var jsStrNormReplacementTable = []string{
 	'<':  `\u003c`,
 	'>':  `\u003e`,
 }
+
 var jsRegexpReplacementTable = []string{
 	0:    `\u0000`,
 	'\t': `\t`,
diff --git a/tpl/internal/go_templates/htmltemplate/state_string.go b/tpl/internal/go_templates/htmltemplate/state_string.go
index be7a92051..eed1e8bcc 100644
--- a/tpl/internal/go_templates/htmltemplate/state_string.go
+++ b/tpl/internal/go_templates/htmltemplate/state_string.go
@@ -21,7 +21,7 @@ func _() {
 	_ = x[stateJS-10]
 	_ = x[stateJSDqStr-11]
 	_ = x[stateJSSqStr-12]
-	_ = x[stateJSBqStr-13]
+	_ = x[stateJSTmplLit-13]
 	_ = x[stateJSRegexp-14]
 	_ = x[stateJSBlockCmt-15]
 	_ = x[stateJSLineCmt-16]
@@ -39,9 +39,9 @@ func _() {
 	_ = x[stateDead-28]
 }
 
-const _state_name = "stateTextstateTagstateAttrNamestateAfterNamestateBeforeValuestateHTMLCmtstateRCDATAstateAttrstateURLstateSrcsetstateJSstateJSDqStrstateJSSqStrstateJSBqStrstateJSRegexpstateJSBlockCmtstateJSLineCmtstateJSHTMLOpenCmtstateJSHTMLCloseCmtstateCSSstateCSSDqStrstateCSSSqStrstateCSSDqURLstateCSSSqURLstateCSSURLstateCSSBlockCmtstateCSSLineCmtstateErrorstateDead"
+const _state_name = "stateTextstateTagstateAttrNamestateAfterNamestateBeforeValuestateHTMLCmtstateRCDATAstateAttrstateURLstateSrcsetstateJSstateJSDqStrstateJSSqStrstateJSTmplLitstateJSRegexpstateJSBlockCmtstateJSLineCmtstateJSHTMLOpenCmtstateJSHTMLCloseCmtstateCSSstateCSSDqStrstateCSSSqStrstateCSSDqURLstateCSSSqURLstateCSSURLstateCSSBlockCmtstateCSSLineCmtstateErrorstateDead"
 
-var _state_index = [...]uint16{0, 9, 17, 30, 44, 60, 72, 83, 92, 100, 111, 118, 130, 142, 154, 167, 182, 196, 214, 233, 241, 254, 267, 280, 293, 304, 320, 335, 345, 354}
+var _state_index = [...]uint16{0, 9, 17, 30, 44, 60, 72, 83, 92, 100, 111, 118, 130, 142, 156, 169, 184, 198, 216, 235, 243, 256, 269, 282, 295, 306, 322, 337, 347, 356}
 
 func (i state) String() string {
 	if i >= state(len(_state_index)-1) {
diff --git a/tpl/internal/go_templates/htmltemplate/transition.go b/tpl/internal/go_templates/htmltemplate/transition.go
index 432c365d3..d5a05f66d 100644
--- a/tpl/internal/go_templates/htmltemplate/transition.go
+++ b/tpl/internal/go_templates/htmltemplate/transition.go
@@ -27,8 +27,8 @@ var transitionFunc = [...]func(context, []byte) (context, int){
 	stateJS:             tJS,
 	stateJSDqStr:        tJSDelimited,
 	stateJSSqStr:        tJSDelimited,
-	stateJSBqStr:        tJSDelimited,
 	stateJSRegexp:       tJSDelimited,
+	stateJSTmplLit:      tJSTmpl,
 	stateJSBlockCmt:     tBlockCmt,
 	stateJSLineCmt:      tLineCmt,
 	stateJSHTMLOpenCmt:  tLineCmt,
@@ -270,7 +270,7 @@ func tURL(c context, s []byte) (context, int) {
 
 // tJS is the context transition function for the JS state.
 func tJS(c context, s []byte) (context, int) {
-	i := bytes.IndexAny(s, "\"`'/<-#")
+	i := bytes.IndexAny(s, "\"`'/{}<-#")
 	if i == -1 {
 		// Entire input is non string, comment, regexp tokens.
 		c.jsCtx = nextJSCtx(s, c.jsCtx)
@@ -283,7 +283,7 @@ func tJS(c context, s []byte) (context, int) {
 	case '\'':
 		c.state, c.jsCtx = stateJSSqStr, jsCtxRegexp
 	case '`':
-		c.state, c.jsCtx = stateJSBqStr, jsCtxRegexp
+		c.state, c.jsCtx = stateJSTmplLit, jsCtxRegexp
 	case '/':
 		switch {
 		case i+1 < len(s) && s[i+1] == '/':
@@ -320,12 +320,66 @@ func tJS(c context, s []byte) (context, int) {
 		if i+1 < len(s) && s[i+1] == '!' {
 			c.state, i = stateJSLineCmt, i+1
 		}
+	case '{':
+		// We only care about tracking brace depth if we are inside of a
+		// template literal.
+		if len(c.jsBraceDepth) == 0 {
+			return c, i + 1
+		}
+		c.jsBraceDepth[len(c.jsBraceDepth)-1]++
+	case '}':
+		if len(c.jsBraceDepth) == 0 {
+			return c, i + 1
+		}
+		// There are no cases where a brace can be escaped in the JS context
+		// that are not syntax errors, it seems. Because of this we can just
+		// count "\}" as "}" and move on, the script is already broken as
+		// fully fledged parsers will just fail anyway.
+		c.jsBraceDepth[len(c.jsBraceDepth)-1]--
+		if c.jsBraceDepth[len(c.jsBraceDepth)-1] >= 0 {
+			return c, i + 1
+		}
+		c.jsBraceDepth = c.jsBraceDepth[:len(c.jsBraceDepth)-1]
+		c.state = stateJSTmplLit
 	default:
 		panic("unreachable")
 	}
 	return c, i + 1
 }
 
+func tJSTmpl(c context, s []byte) (context, int) {
+	var k int
+	for {
+		i := k + bytes.IndexAny(s[k:], "`\\$")
+		if i < k {
+			break
+		}
+		switch s[i] {
+		case '\\':
+			i++
+			if i == len(s) {
+				return context{
+					state: stateError,
+					err:   errorf(ErrPartialEscape, nil, 0, "unfinished escape sequence in JS string: %q", s),
+				}, len(s)
+			}
+		case '$':
+			if len(s) >= i+2 && s[i+1] == '{' {
+				c.jsBraceDepth = append(c.jsBraceDepth, 0)
+				c.state = stateJS
+				return c, i + 2
+			}
+		case '`':
+			// end
+			c.state = stateJS
+			return c, i + 1
+		}
+		k = i + 1
+	}
+
+	return c, len(s)
+}
+
 // tJSDelimited is the context transition function for the JS string and regexp
 // states.
 func tJSDelimited(c context, s []byte) (context, int) {
@@ -333,8 +387,6 @@ func tJSDelimited(c context, s []byte) (context, int) {
 	switch c.state {
 	case stateJSSqStr:
 		specials = `\'`
-	case stateJSBqStr:
-		specials = "`\\"
 	case stateJSRegexp:
 		specials = `\/[]`
 	}
diff --git a/tpl/internal/go_templates/testenv/exec.go b/tpl/internal/go_templates/testenv/exec.go
index 88791b3b4..144602248 100644
--- a/tpl/internal/go_templates/testenv/exec.go
+++ b/tpl/internal/go_templates/testenv/exec.go
@@ -60,13 +60,6 @@ func tryExec() error {
 	// may as well use the same path so that this branch can be tested without
 	// an ios environment.
 
-	/*if !testing.Testing() {
-		// This isn't a standard 'go test' binary, so we don't know how to
-		// self-exec in a way that should succeed without side effects.
-		// Just forget it.
-		return errors.New("can't probe for exec support with a non-test executable")
-	}*/
-
 	// We know that this is a test executable. We should be able to run it with a
 	// no-op flag to check for overall exec support.
 	exe, err := os.Executable()
@@ -99,11 +92,14 @@ func MustHaveExecPath(t testing.TB, path string) {
 // CleanCmdEnv will fill cmd.Env with the environment, excluding certain
 // variables that could modify the behavior of the Go tools such as
 // GODEBUG and GOTRACEBACK.
+//
+// If the caller wants to set cmd.Dir, set it before calling this function,
+// so PWD will be set correctly in the environment.
 func CleanCmdEnv(cmd *exec.Cmd) *exec.Cmd {
 	if cmd.Env != nil {
 		panic("environment already set")
 	}
-	for _, env := range os.Environ() {
+	for _, env := range cmd.Environ() {
 		// Exclude GODEBUG from the environment to prevent its output
 		// from breaking tests that are trying to parse other command output.
 		if strings.HasPrefix(env, "GODEBUG=") {
diff --git a/tpl/internal/go_templates/testenv/testenv.go b/tpl/internal/go_templates/testenv/testenv.go
index 2430ae6cf..97d897a1f 100644
--- a/tpl/internal/go_templates/testenv/testenv.go
+++ b/tpl/internal/go_templates/testenv/testenv.go
@@ -15,10 +15,6 @@ import (
 	"errors"
 	"flag"
 	"fmt"
-
-	"github.com/gohugoio/hugo/tpl/internal/go_templates/cfg"
-
-	//"internal/platform"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -27,6 +23,8 @@ import (
 	"strings"
 	"sync"
 	"testing"
+
+	"github.com/gohugoio/hugo/tpl/internal/go_templates/cfg"
 )
 
 // Save the original environment during init for use in checks. A test
@@ -45,8 +43,8 @@ func Builder() string {
 
 // HasGoBuild reports whether the current system can build programs with “go build”
 // and then run them with os.StartProcess or exec.Command.
+// Modified by Hugo (not needed)
 func HasGoBuild() bool {
-	// Modified by Hugo (not needed)
 	return false
 }
 
@@ -69,13 +67,13 @@ func MustHaveGoBuild(t testing.TB) {
 	}
 }
 
-// HasGoRun reports whether the current system can run programs with “go run.”
+// HasGoRun reports whether the current system can run programs with “go run”.
 func HasGoRun() bool {
 	// For now, having go run and having go build are the same.
 	return HasGoBuild()
 }
 
-// MustHaveGoRun checks that the current system can run programs with “go run.”
+// MustHaveGoRun checks that the current system can run programs with “go run”.
 // If not, MustHaveGoRun calls t.Skip with an explanation.
 func MustHaveGoRun(t testing.TB) {
 	if !HasGoRun() {
@@ -300,8 +298,8 @@ func MustHaveCGO(t testing.TB) {
 
 // CanInternalLink reports whether the current system can link programs with
 // internal linking.
+// Modified by Hugo (not needed)
 func CanInternalLink(withCgo bool) bool {
-	// Modified by Hugo (not needed)
 	return false
 }
 
@@ -320,8 +318,8 @@ func MustInternalLink(t testing.TB, withCgo bool) {
 // MustHaveBuildMode reports whether the current system can build programs in
 // the given build mode.
 // If not, MustHaveBuildMode calls t.Skip with an explanation.
+// Modified by Hugo (not needed)
 func MustHaveBuildMode(t testing.TB, buildmode string) {
-	// Modified by Hugo (not needed)
 }
 
 // HasSymlink reports whether the current system can use os.Symlink.
@@ -438,7 +436,7 @@ func WriteImportcfg(t testing.TB, dstPath string, packageFiles map[string]string
 		}
 	}
 
-	if err := os.WriteFile(dstPath, icfg.Bytes(), 0666); err != nil {
+	if err := os.WriteFile(dstPath, icfg.Bytes(), 0o666); err != nil {
 		t.Fatal(err)
 	}
 }
diff --git a/tpl/internal/go_templates/testenv/testenv_notunix.go b/tpl/internal/go_templates/testenv/testenv_notunix.go
index 9d55f6258..916f18153 100644
--- a/tpl/internal/go_templates/testenv/testenv_notunix.go
+++ b/tpl/internal/go_templates/testenv/testenv_notunix.go
@@ -7,6 +7,8 @@
 package testenv
 
 import (
+	"errors"
+	"io/fs"
 	"os"
 )
 
@@ -15,6 +17,5 @@ import (
 var Sigquit = os.Kill
 
 func syscallIsNotSupported(err error) bool {
-	// Removed by Hugo (not supported in Go 1.20).
-	return false
+	return errors.Is(err, fs.ErrPermission)
 }
diff --git a/tpl/internal/go_templates/testenv/testenv_test.go b/tpl/internal/go_templates/testenv/testenv_test.go
index 564bff1ab..13e11abfb 100644
--- a/tpl/internal/go_templates/testenv/testenv_test.go
+++ b/tpl/internal/go_templates/testenv/testenv_test.go
@@ -5,13 +5,13 @@
 package testenv_test
 
 import (
-	"github.com/gohugoio/hugo/tpl/internal/go_templates/testenv"
-	//"internal/platform"
 	"os"
 	"path/filepath"
 	"runtime"
 	"strings"
 	"testing"
+
+	"github.com/gohugoio/hugo/tpl/internal/go_templates/testenv"
 )
 
 func TestGoToolLocation(t *testing.T) {
@@ -83,3 +83,26 @@ func TestMustHaveExec(t *testing.T) {
 		}
 	}
 }
+
+func TestCleanCmdEnvPWD(t *testing.T) {
+	// Test that CleanCmdEnv sets PWD if cmd.Dir is set.
+	switch runtime.GOOS {
+	case "plan9", "windows":
+		t.Skipf("PWD is not used on %s", runtime.GOOS)
+	}
+	dir := t.TempDir()
+	cmd := testenv.Command(t, testenv.GoToolPath(t), "help")
+	cmd.Dir = dir
+	cmd = testenv.CleanCmdEnv(cmd)
+
+	for _, env := range cmd.Env {
+		if strings.HasPrefix(env, "PWD=") {
+			pwd := strings.TrimPrefix(env, "PWD=")
+			if pwd != dir {
+				t.Errorf("unexpected PWD: want %s, got %s", dir, pwd)
+			}
+			return
+		}
+	}
+	t.Error("PWD not set in cmd.Env")
+}
diff --git a/tpl/internal/go_templates/testenv/testenv_unix.go b/tpl/internal/go_templates/testenv/testenv_unix.go
index abb89eeca..296eefc7a 100644
--- a/tpl/internal/go_templates/testenv/testenv_unix.go
+++ b/tpl/internal/go_templates/testenv/testenv_unix.go
@@ -7,6 +7,8 @@
 package testenv
 
 import (
+	"errors"
+	"io/fs"
 	"syscall"
 )
 
@@ -15,6 +17,27 @@ import (
 var Sigquit = syscall.SIGQUIT
 
 func syscallIsNotSupported(err error) bool {
-	// Removed by Hugo (not supported in Go 1.20)
+	if err == nil {
+		return false
+	}
+
+	var errno syscall.Errno
+	if errors.As(err, &errno) {
+		switch errno {
+		case syscall.EPERM, syscall.EROFS:
+			// User lacks permission: either the call requires root permission and the
+			// user is not root, or the call is denied by a container security policy.
+			return true
+		case syscall.EINVAL:
+			// Some containers return EINVAL instead of EPERM if a system call is
+			// denied by security policy.
+			return true
+		}
+	}
+
+	if errors.Is(err, fs.ErrPermission) {
+		return true
+	}
+
 	return false
 }
diff --git a/tpl/internal/go_templates/texttemplate/doc.go b/tpl/internal/go_templates/texttemplate/doc.go
index 4c01b05eb..032784bc3 100644
--- a/tpl/internal/go_templates/texttemplate/doc.go
+++ b/tpl/internal/go_templates/texttemplate/doc.go
@@ -438,13 +438,13 @@ produce the text
 By construction, a template may reside in only one association. If it's
 necessary to have a template addressable from multiple associations, the
 template definition must be parsed multiple times to create distinct *Template
-values, or must be copied with the Clone or AddParseTree method.
+values, or must be copied with [Template.Clone] or [Template.AddParseTree].
 
 Parse may be called multiple times to assemble the various associated templates;
-see the ParseFiles and ParseGlob functions and methods for simple ways to parse
-related templates stored in files.
+see [ParseFiles], [ParseGlob], [Template.ParseFiles] and [Template.ParseGlob]
+for simple ways to parse related templates stored in files.
 
-A template may be executed directly or through ExecuteTemplate, which executes
+A template may be executed directly or through [Template.ExecuteTemplate], which executes
 an associated template identified by name. To invoke our example above, we
 might write,
 
diff --git a/tpl/internal/go_templates/texttemplate/exec.go b/tpl/internal/go_templates/texttemplate/exec.go
index 597866c68..73153c764 100644
--- a/tpl/internal/go_templates/texttemplate/exec.go
+++ b/tpl/internal/go_templates/texttemplate/exec.go
@@ -7,12 +7,13 @@ package template
 import (
 	"errors"
 	"fmt"
-	"github.com/gohugoio/hugo/tpl/internal/go_templates/fmtsort"
-	"github.com/gohugoio/hugo/tpl/internal/go_templates/texttemplate/parse"
 	"io"
 	"reflect"
 	"runtime"
 	"strings"
+
+	"github.com/gohugoio/hugo/tpl/internal/go_templates/fmtsort"
+	"github.com/gohugoio/hugo/tpl/internal/go_templates/texttemplate/parse"
 )
 
 // maxExecDepth specifies the maximum stack depth of templates within
diff --git a/tpl/internal/go_templates/texttemplate/exec_test.go b/tpl/internal/go_templates/texttemplate/exec_test.go
index b8b3f3bbe..030e20ca0 100644
--- a/tpl/internal/go_templates/texttemplate/exec_test.go
+++ b/tpl/internal/go_templates/texttemplate/exec_test.go
@@ -320,12 +320,16 @@ var execTests = []execTest{
 	{"$.U.V", "{{$.U.V}}", "v", tVal, true},
 	{"declare in action", "{{$x := $.U.V}}{{$x}}", "v", tVal, true},
 	{"simple assignment", "{{$x := 2}}{{$x = 3}}{{$x}}", "3", tVal, true},
-	{"nested assignment",
+	{
+		"nested assignment",
 		"{{$x := 2}}{{if true}}{{$x = 3}}{{end}}{{$x}}",
-		"3", tVal, true},
-	{"nested assignment changes the last declaration",
+		"3", tVal, true,
+	},
+	{
+		"nested assignment changes the last declaration",
 		"{{$x := 1}}{{if true}}{{$x := 2}}{{if true}}{{$x = 3}}{{end}}{{end}}{{$x}}",
-		"1", tVal, true},
+		"1", tVal, true,
+	},
 
 	// Type with String method.
 	{"V{6666}.String()", "-{{.V0}}-", "-<6666>-", tVal, true},
@@ -372,15 +376,21 @@ var execTests = []execTest{
 	{".Method3(nil constant)", "-{{.Method3 nil}}-", "-Method3: <nil>-", tVal, true},
 	{".Method3(nil value)", "-{{.Method3 .MXI.unset}}-", "-Method3: <nil>-", tVal, true},
 	{"method on var", "{{if $x := .}}-{{$x.Method2 .U16 $x.X}}{{end}}-", "-Method2: 16 x-", tVal, true},
-	{"method on chained var",
+	{
+		"method on chained var",
 		"{{range .MSIone}}{{if $.U.TrueFalse $.True}}{{$.U.TrueFalse $.True}}{{else}}WRONG{{end}}{{end}}",
-		"true", tVal, true},
-	{"chained method",
+		"true", tVal, true,
+	},
+	{
+		"chained method",
 		"{{range .MSIone}}{{if $.GetU.TrueFalse $.True}}{{$.U.TrueFalse $.True}}{{else}}WRONG{{end}}{{end}}",
-		"true", tVal, true},
-	{"chained method on variable",
+		"true", tVal, true,
+	},
+	{
+		"chained method on variable",
 		"{{with $x := .}}{{with .SI}}{{$.GetU.TrueFalse $.True}}{{end}}{{end}}",
-		"true", tVal, true},
+		"true", tVal, true,
+	},
 	{".NilOKFunc not nil", "{{call .NilOKFunc .PI}}", "false", tVal, true},
 	{".NilOKFunc nil", "{{call .NilOKFunc nil}}", "true", tVal, true},
 	{"method on nil value from slice", "-{{range .}}{{.Method1 1234}}{{end}}-", "-1234-", tSliceOfNil, true},
@@ -466,10 +476,14 @@ var execTests = []execTest{
 	{"printf lots", `{{printf "%d %s %g %s" 127 "hello" 7-3i .Method0}}`, "127 hello (7-3i) M0", tVal, true},
 
 	// HTML.
-	{"html", `{{html "<script>alert(\"XSS\");</script>"}}`,
-		"&lt;script&gt;alert(&#34;XSS&#34;);&lt;/script&gt;", nil, true},
-	{"html pipeline", `{{printf "<script>alert(\"XSS\");</script>" | html}}`,
-		"&lt;script&gt;alert(&#34;XSS&#34;);&lt;/script&gt;", nil, true},
+	{
+		"html", `{{html "<script>alert(\"XSS\");</script>"}}`,
+		"&lt;script&gt;alert(&#34;XSS&#34;);&lt;/script&gt;", nil, true,
+	},
+	{
+		"html pipeline", `{{printf "<script>alert(\"XSS\");</script>" | html}}`,
+		"&lt;script&gt;alert(&#34;XSS&#34;);&lt;/script&gt;", nil, true,
+	},
 	{"html", `{{html .PS}}`, "a string", tVal, true},
 	{"html typed nil", `{{html .NIL}}`, "&lt;nil&gt;", tVal, true},
 	{"html untyped nil", `{{html .Empty0}}`, "&lt;no value&gt;", tVal, true},
@@ -844,7 +858,7 @@ var delimPairs = []string{
 
 func TestDelims(t *testing.T) {
 	const hello = "Hello, world"
-	var value = struct{ Str string }{hello}
+	value := struct{ Str string }{hello}
 	for i := 0; i < len(delimPairs); i += 2 {
 		text := ".Str"
 		left := delimPairs[i+0]
@@ -867,7 +881,7 @@ func TestDelims(t *testing.T) {
 		if err != nil {
 			t.Fatalf("delim %q text %q parse err %s", left, text, err)
 		}
-		var b = new(strings.Builder)
+		b := new(strings.Builder)
 		err = tmpl.Execute(b, value)
 		if err != nil {
 			t.Fatalf("delim %q exec err %s", left, err)
@@ -990,7 +1004,7 @@ const treeTemplate = `
 `
 
 func TestTree(t *testing.T) {
-	var tree = &Tree{
+	tree := &Tree{
 		1,
 		&Tree{
 			2, &Tree{
@@ -1243,7 +1257,7 @@ var cmpTests = []cmpTest{
 
 func TestComparison(t *testing.T) {
 	b := new(strings.Builder)
-	var cmpStruct = struct {
+	cmpStruct := struct {
 		Uthree, Ufour    uint
 		NegOne, Three    int
 		Ptr, NilPtr      *int
diff --git a/tpl/internal/go_templates/texttemplate/funcs.go b/tpl/internal/go_templates/texttemplate/funcs.go
index b5a8c9ec5..a949f896f 100644
--- a/tpl/internal/go_templates/texttemplate/funcs.go
+++ b/tpl/internal/go_templates/texttemplate/funcs.go
@@ -478,7 +478,7 @@ func eq(arg1 reflect.Value, arg2 ...reflect.Value) (bool, error) {
 			case k1 == uintKind && k2 == intKind:
 				truth = arg.Int() >= 0 && arg1.Uint() == uint64(arg.Int())
 			default:
-				if arg1 != zero && arg != zero {
+				if arg1.IsValid() && arg.IsValid() {
 					return false, errBadComparison
 				}
 			}
diff --git a/tpl/template.go b/tpl/template.go
index 70fdf2d3d..61aaa993f 100644
--- a/tpl/template.go
+++ b/tpl/template.go
@@ -169,13 +169,6 @@ func SetPageInContext(ctx context.Context, p page) context.Context {
 	return context.WithValue(ctx, texttemplate.PageContextKey, p)
 }
 
-// SetSecurityAllowActionJSTmpl sets the global setting for allowing tempalte actions in JS template literals.
-// This was added in Hugo 0.114.0.
-// See https://github.com/golang/go/issues/59234
-func SetSecurityAllowActionJSTmpl(b bool) {
-	htmltemplate.SecurityAllowActionJSTmpl.Store(b)
-}
-
 type page interface {
 	IsNode() bool
 }
diff --git a/tpl/tplimpl/integration_test.go b/tpl/tplimpl/integration_test.go
index fa511fbab..1b2cffce6 100644
--- a/tpl/tplimpl/integration_test.go
+++ b/tpl/tplimpl/integration_test.go
@@ -114,7 +114,6 @@ and2: true
 or2: true
 counter2: 3
 `)
-
 }
 
 // Issue 10495
@@ -163,7 +162,6 @@ title: "S3P1"
 }
 
 func TestGoTemplateBugs(t *testing.T) {
-
 	t.Run("Issue 11112", func(t *testing.T) {
 		t.Parallel()
 
@@ -188,11 +186,9 @@ func TestGoTemplateBugs(t *testing.T) {
 
 		b.AssertFileContent("public/index.html", `key = value`)
 	})
-
 }
 
 func TestSecurityAllowActionJSTmpl(t *testing.T) {
-
 	filesTemplate := `
 -- config.toml --
 SECURITYCONFIG
@@ -211,20 +207,6 @@ var a = §§{{.Title }}§§;
 		},
 	).BuildE()
 
-	b.Assert(err, qt.Not(qt.IsNil))
-	b.Assert(err.Error(), qt.Contains, "{{.Title}} appears in a JS template literal")
-
-	files = strings.ReplaceAll(filesTemplate, "SECURITYCONFIG", `
-[security]
-[security.gotemplates]
-allowActionJSTmpl = true		
-`)
-
-	b = hugolib.NewIntegrationTestBuilder(
-		hugolib.IntegrationTestConfig{
-			T:           t,
-			TxtarString: files,
-		},
-	).Build()
-
+	// This used to fail, but not in >= Hugo 0.121.0.
+	b.Assert(err, qt.IsNil)
 }