diff --git a/detection_rules/main.py b/detection_rules/main.py
index d2f3c4df7a6..7246768225c 100644
--- a/detection_rules/main.py
+++ b/detection_rules/main.py
@@ -13,7 +13,7 @@
 import pytoml
 from eql import load_dump
 
-from .misc import nested_set
+from .misc import PYTHON_LICENSE, nested_set
 from . import rule_loader
 from .packaging import PACKAGE_FILE, Package, manage_versions
 from .rule import RULE_TYPE_OPTIONS, Rule
@@ -157,13 +157,6 @@ def validate_rule(rule_id, rule_name, path):
     return rule
 
 
-license_header = """
-# Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
-# or more contributor license agreements. Licensed under the Elastic License;
-# you may not use this file except in compliance with the Elastic License.
-""".strip()
-
-
 @root.command('license-check')
 @click.pass_context
 def license_check(ctx):
@@ -184,7 +177,7 @@ def license_check(ctx):
             if contents.startswith("#!/"):
                 _, _, contents = contents.partition("\n")
 
-            if not contents.lstrip("\r\n").startswith(license_header):
+            if not contents.lstrip("\r\n").startswith(PYTHON_LICENSE):
                 if not failed:
                     click.echo("Missing license headers for:", err=True)
 
diff --git a/detection_rules/misc.py b/detection_rules/misc.py
index 694b60518d7..9cbb7bcd05a 100644
--- a/detection_rules/misc.py
+++ b/detection_rules/misc.py
@@ -16,6 +16,20 @@
 
 _CONFIG = {}
 
+LICENSE_HEADER = """
+Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+or more contributor license agreements. Licensed under the Elastic License;
+you may not use this file except in compliance with the Elastic License.
+""".strip()
+
+LICENSE_LINES = LICENSE_HEADER.splitlines()
+PYTHON_LICENSE = "\n".join("# " + line for line in LICENSE_LINES)
+JS_LICENSE = """
+/*
+{}
+ */
+""".strip().format("\n".join(' * ' + line for line in LICENSE_LINES))
+
 
 def nested_get(_dict, dot_key, default=None):
     """Get a nested field from a nested dict with dot notation."""
diff --git a/detection_rules/packaging.py b/detection_rules/packaging.py
index 064f1b66439..d7b622d0b9e 100644
--- a/detection_rules/packaging.py
+++ b/detection_rules/packaging.py
@@ -13,6 +13,7 @@
 import click
 
 from . import rule_loader
+from .misc import JS_LICENSE
 from .rule import Rule  # noqa: F401
 from .utils import get_path, get_etc_path
 
@@ -129,12 +130,37 @@ def _package_notice_file(save_dir):
         with open(NOTICE_FILE, 'rt') as f:
             notice_txt = f.read()
 
-        with open(os.path.join(save_dir, 'notice.ts'), 'w') as f:
+        with open(os.path.join(save_dir, 'notice.ts'), 'wt') as f:
             commented_notice = [' * ' + line for line in notice_txt.splitlines()]
             lines = ['/* eslint-disable @kbn/eslint/require-license-header */', '', '/* @notice']
             lines = lines + commented_notice + [' */', '']
             f.write('\n'.join(lines))
 
+    def _package_index_file(self, save_dir):
+        """Convert and save index file with package."""
+        sorted_rules = sorted(self.rules, key=lambda k: (k.metadata['creation_date'], os.path.basename(k.path)))
+        comments = [
+            '// Auto generated file from either:',
+            '// - scripts/regen_prepackage_rules_index.sh',
+            '// - detection-rules repo using CLI command build-release',
+            '// Do not hand edit. Run script/command to regenerate package information instead',
+        ]
+        rule_imports = [f"import rule{i} from './{os.path.splitext(os.path.basename(r.path))[0] + '.json'}';"
+                        for i, r in enumerate(sorted_rules, 1)]
+        const_exports = ['export const rawRules = [']
+        const_exports.extend(f"  rule{i}," for i, _ in enumerate(sorted_rules, 1))
+        const_exports.append("];")
+        const_exports.append(" ")
+
+        index_ts = [JS_LICENSE, ""]
+        index_ts.extend(comments)
+        index_ts.append("")
+        index_ts.extend(rule_imports)
+        index_ts.append("")
+        index_ts.extend(const_exports)
+        with open(os.path.join(save_dir, 'index.ts'), 'wt') as f:
+            f.write('\n'.join(index_ts))
+
     def save_release_files(self, directory, changed_rules, new_rules):
         """Release a package."""
         with open(os.path.join(directory, '{}-summary.txt'.format(self.name)), 'w') as f:
@@ -165,6 +191,7 @@ def save(self, verbose=True):
             rule.save(new_path=os.path.join(rules_dir, os.path.basename(rule.path)))
 
         self._package_notice_file(rules_dir)
+        self._package_index_file(rules_dir)
 
         if self.release:
             self.save_release_files(extras_dir, self.changed_rules, self.new_rules)