diff --git a/.esbuild/esbuild.cjs b/.esbuild/esbuild.cjs
index 5cdee62c7..776ae6eec 100644
--- a/.esbuild/esbuild.cjs
+++ b/.esbuild/esbuild.cjs
@@ -7,8 +7,15 @@ const handler = (e) => {
 };
 const watch = process.argv.includes('--watch');
 
+// mermaid.js
 build(umdBuild({ minify: false, watch })).catch(handler);
+// mermaid.esm.mjs
 build(esmBuild({ minify: false, watch })).catch(handler);
 
+// mermaid.core.js
+build(umdBuild({ minify: false, core: true })).catch(handler);
+
+// mermaid.min.js
 build(esmBuild()).catch(handler);
+// mermaid.esm.min.mjs
 build(umdBuild()).catch(handler);
diff --git a/.esbuild/util.cjs b/.esbuild/util.cjs
index 7fc77d0c5..518bb723f 100644
--- a/.esbuild/util.cjs
+++ b/.esbuild/util.cjs
@@ -39,12 +39,17 @@ exports.esmBuild = (override = { minify: true }) => {
 };
 
 /**
- * @param {Options} override
+ * @param {Options & { core?: boolean }} override
  * @returns {Options}
  */
-exports.umdBuild = (override = { minify: true }) => {
+exports.umdBuild = (override = { minify: true, core: false }) => {
+  const core = override.core;
+  if (core && override.minify) {
+    throw new Error('Cannot minify core build');
+  }
+  delete override.core;
   return buildOptions({
-    outfile: `dist/mermaid${override.minify ? '.min' : ''}.js`,
+    outfile: `dist/mermaid${override.minify ? '.min' : core ? '.core' : ''}.js`,
     ...override,
   });
 };