diff --git a/Github Actions.sublime-syntax b/Github Actions.sublime-syntax
index 6ba84b7..49fa80d 100644
--- a/Github Actions.sublime-syntax	
+++ b/Github Actions.sublime-syntax	
@@ -9,6 +9,11 @@ extends: Packages/YamlPipelines/YamlPipeline.sublime-syntax
 contexts:
   node:
     - meta_prepend: true
+    - match: \s+(uses)\s*(:)(?=\s+actions/github-script\b)
+      captures:
+        1: meta.mapping.key.yaml meta.string.yaml string.unquoted.plain.out.yaml
+        2: punctuation.separator.key-value.yaml
+      push: github-script-step
     - match: \s+(shell)\s*(:)(?=\s|$)
       captures:
         1: meta.mapping.key.yaml meta.string.yaml string.unquoted.plain.out.yaml keyword.control.shell.pipeline
@@ -44,6 +49,21 @@ contexts:
         2: punctuation.separator.key-value.yaml
       push: expect-jobs
 
+  github-script-step:
+    # bailout at end of step
+    # - either next step
+    # - or next job
+    - match: ^(?=\s*-|\s{,2}\S)
+      pop: 1
+    # consume single script block with powershell syntax
+    - match: \s+(script)\s*(:)(?=\s|$)
+      captures:
+        1: meta.mapping.key.yaml meta.string.yaml string.unquoted.plain.out.yaml
+        2: punctuation.separator.key-value.yaml
+      set: javascript-block-node
+    # consume ordinary nodes
+    - include: node
+
   expect-shell-name:
     - match: \b(?i:pwsh|powershell)\b
       scope: constant.other.language-name.yaml
@@ -117,6 +137,12 @@ contexts:
     - include: scope:source.shell.bash.folded-github-actions
       apply_prototype: true
 
+  embedded-javascript:
+    - meta_include_prototype: false
+    - meta_content_scope: source.js.embedded
+    - include: scope:source.js
+      apply_prototype: true
+
   embedded-pwsh:
     - meta_include_prototype: false
     - meta_content_scope: source.powershell.embedded
diff --git a/YamlPipeline.sublime-syntax b/YamlPipeline.sublime-syntax
index 59d258a..1192ac6 100644
--- a/YamlPipeline.sublime-syntax
+++ b/YamlPipeline.sublime-syntax
@@ -55,6 +55,7 @@ contexts:
     - include: strings
 
   inside-function-call-parens:
+    - meta_include_prototype: false
     - meta_content_scope: meta.function-call.arguments.pipeline
     - match: \)
       scope: punctuation.section.parens.end.pipeline
@@ -63,6 +64,71 @@ contexts:
       scope: punctuation.separator.argument.pipeline
     - include: inside-expression
 
+###[ JAVASCRIPT SCRIPT BLOCKS ]################################################
+
+  javascript-block-node:
+    - meta_scope: meta.block.javascript.pipeline
+    - include: javascript-block-scalar
+    - include: flow-scalar-javascript-out
+
+  javascript-block-scalar:
+    # http://www.yaml.org/spec/1.2/spec.html#style/block/scalar
+    # c-l+folded(n)
+    - match: (>)([1-9])?([-+]?)  # c-b-block-header(m,t)
+      captures:
+        1: keyword.control.flow.block-scalar.folded.yaml
+        2: constant.numeric.indentation-indicator.yaml
+        3: javascript-block-scalar-begin
+      set: javascript-block-scalar-begin
+    # c-l+literal(n)
+    - match: (\|)([1-9])?([-+]?)  # c-b-block-header(m,t)
+      captures:
+        1: keyword.control.flow.block-scalar.literal.yaml
+        2: constant.numeric.indentation-indicator.yaml
+        3: storage.modifier.chomping-indicator.yaml
+      set: javascript-block-scalar-begin
+
+  flow-scalar-javascript-out:
+    # double quoted scalar
+    - match: \"
+      scope: meta.string.yaml string.quoted.double.yaml punctuation.definition.string.begin.yaml
+      embed: embedded-javascript
+      embed_scope: meta.string.yaml
+      escape: \"
+      escape_captures:
+        0: meta.string.yaml string.quoted.double.yaml punctuation.definition.string.end.yaml
+      pop: 1
+    # single quoted scalar
+    - match: \'
+      scope: meta.string.yaml string.quoted.single.yaml punctuation.definition.string.begin.yaml
+      embed: embedded-javascript
+      embed_scope: meta.string.yaml
+      escape: \'
+      escape_captures:
+        0: meta.string.yaml string.quoted.single.yaml punctuation.definition.string.end.yaml
+      pop: 1
+    # unquoted scalar
+    - match: (?={{ns_plain_first_plain_out}})
+      embed: embedded-javascript
+      embed_scope: meta.string.yaml
+      escape: '{{_flow_scalar_end_plain_out}}'
+      pop: 1
+
+  javascript-block-scalar-begin:
+    - meta_include_prototype: false
+    - include: comment
+    - match: ^([ ]+)(?! )  # match first non-empty line to determine indentation level
+      scope: meta.block.javascript.pipeline source.js.embedded
+      # note that we do not check if indentation is enough
+      embed: embedded-javascript
+      embed_scope: meta.block.javascript.pipeline
+      escape: ^(?!\1|\s*$)
+      pop: 1
+    - match: ^(?=\S)  # the block is empty
+      pop: 1
+    - match: .+
+      scope: invalid.illegal.expected-comment-or-newline.yaml
+
 ###[ POWERSHELL SCRIPT BLOCKS ]################################################
 
   pwsh-block-node:
@@ -273,6 +339,9 @@ contexts:
   embedded-bash-folded:
     - meta_include_prototype: false
 
+  embedded-javascript:
+    - meta_include_prototype: false
+
   embedded-pwsh:
     - meta_include_prototype: false
 
diff --git a/tests/syntax_test_github_actions.yml b/tests/syntax_test_github_actions.yml
index e0733d4..bc0de8a 100644
--- a/tests/syntax_test_github_actions.yml
+++ b/tests/syntax_test_github_actions.yml
@@ -91,6 +91,28 @@ jobs:
 
     steps:
 
+
+      - name: Test JavaScript Highlighting
+        uses: actions/github-script@v9
+        with:
+          script: |
+# <- meta.block.javascript.pipeline
+#^^^^^^^^^^^^^^^^^^ meta.block.javascript.pipeline
+#         ^^^^^^ meta.mapping.key.yaml meta.string.yaml string.unquoted.plain.out.yaml
+#               ^ punctuation.separator.key-value.yaml
+#                 ^ keyword.control.flow.block-scalar.literal.yaml
+            await github.rest.repos.merge({
+            # <- meta.block.javascript.pipeline source.js.embedded keyword.control.flow.await.js
+            #^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ meta.block.javascript.pipeline source.js.embedded
+            #^^^^ keyword.control.flow.await.js
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              base: "v1",
+              head: context.sha,
+              commit_message: "Merge to v1"
+            });
+            # <- meta.block.javascript.pipeline source.js.embedded meta.function-call.arguments.js meta.group.js meta.mapping.js punctuation.section.mapping.end.js
+
       - name: Test leading source.powershell
         shell: pwsh
         # <- meta.mapping.key.yaml meta.string.yaml string.unquoted.plain.out.yaml keyword.control.shell.pipeline