diff --git a/.esbuild/esbuild.cjs b/.esbuild/esbuild.cjs
index e38951bdb..e3505cc01 100644
--- a/.esbuild/esbuild.cjs
+++ b/.esbuild/esbuild.cjs
@@ -7,14 +7,7 @@ const handler = (e) => {
 };
 const watch = process.argv.includes('--watch');
 
-// mermaid.js
-build(iifeBuild({ minify: false, watch })).catch(handler);
 // mermaid.esm.mjs
 build(esmBuild({ minify: false, watch })).catch(handler);
-
-// mermaid.min.js
-build(esmBuild()).catch(handler);
-// mermaid.esm.min.mjs
-build(iifeBuild()).catch(handler);
 // mermaid.core.mjs (node_modules unbundled)
 build(esmCoreBuild()).catch(handler);
diff --git a/.esbuild/util.cjs b/.esbuild/util.cjs
index 0cddb7e45..0f3ae9b2c 100644
--- a/.esbuild/util.cjs
+++ b/.esbuild/util.cjs
@@ -29,7 +29,6 @@ const buildOptions = (override = {}) => {
 const getOutFiles = (extension) => {
   return {
     [`mermaid${extension}`]: 'src/mermaid.ts',
-    [`diagramAPI${extension}`]: 'src/diagram-api/diagramAPI.ts',
   };
 };
 /**
@@ -69,22 +68,6 @@ exports.esmCoreBuild = (override) => {
   });
 };
 
-/**
- * Build options for mermaid.js build.
- *
- * For IIFE browser use (where ESM is not yet supported).
- *
- * @param {Options} override - Override options.
- * @returns {Options} ESBuild build options.
- */
-exports.iifeBuild = (override = { minify: true }) => {
-  return buildOptions({
-    entryPoints: getOutFiles(override.minify ? '.min' : ''),
-    format: 'iife',
-    ...override,
-  });
-};
-
 const jisonPlugin = {
   name: 'jison',
   setup(build) {