Fix for async issue in parse, adding parseAsync

packages/mermaid/src/mermaid.ts

@@ -309,6 +309,9 @@ const setParseErrorHandler = function (newParseErrorHandler: (err: any, hash: an
 const parse = (txt: string) => {
   return mermaidAPI.parse(txt, mermaid.parseError);
 };
+const parseAsync = (txt: string) => {
+  return mermaidAPI.parseAsync(txt, mermaid.parseError);
+};
 
 const mermaid: {
   startOnLoad: boolean;
@@ -317,6 +320,7 @@ const mermaid: {
   parseError?: Function;
   mermaidAPI: typeof mermaidAPI;
   parse: typeof parse;
+  parseAsync: typeof parseAsync;
   render: typeof mermaidAPI.render;
   init: typeof init;
   initThrowsErrors: typeof initThrowsErrors;
@@ -328,6 +332,7 @@ const mermaid: {
   diagrams: {},
   mermaidAPI,
   parse,
+  parseAsync,
   render: mermaidAPI.render,
   init,
   initThrowsErrors,

packages/mermaid/src/mermaidAPI.ts

@@ -43,6 +43,18 @@ function parse(text: string, parseError?: Function): boolean {
   const diagram = new Diagram(text, parseError);
   return diagram.parse(text, parseError);
 }
+/* eslint-disable @typescript-eslint/ban-types */
+/**
+ *
+ * @param text
+ * @param parseError
+ */
+async function parseAsync(text: string, parseError?: Function): Promise<boolean> {
+  addDiagrams();
+  const diagram = await getDiagramFromText(text, parseError);
+  return diagram.parse(text, parseError);
+}
+/* eslint-enable @typescript-eslint/ban-types */
 
 export const encodeEntities = function (text: string): string {
   let txt = text;
@@ -760,6 +772,7 @@ export const mermaidAPI = Object.freeze({
   render,
   renderAsync,
   parse,
+  parseAsync,
   parseDirective,
   initialize,
   getConfig: configApi.getConfig,
@@ -778,6 +791,7 @@ export const mermaidAPI = Object.freeze({
 setLogLevel(configApi.getConfig().logLevel);
 configApi.reset(configApi.getConfig());
 export default mermaidAPI;
+
 /**
  * ## mermaidAPI configuration defaults
  *