𝐁 Bold text in typst in line fixed

.changeset/five-jobs-hang.md

@@ -0,0 +1,5 @@
+---
+"myst-to-typst": patch
+---
+
+𝐁 Bold text in typst in line fixed

packages/myst-to-typst/src/index.ts

@@ -107,6 +107,14 @@ const linkHandler = (node: any, state: ITypstSerializer) => {
   }
 };
 
+function prevCharacterIsText(parent: GenericNode, node: GenericNode): boolean {
+  const ind = parent?.children?.findIndex((n: GenericNode) => n === node);
+  if (!ind) return false;
+  const prev = parent?.children?.[ind - 1];
+  if (!prev?.value) return false;
+  return (prev?.type === 'text' && !!prev.value.match(/[a-zA-Z0-9\-_]$/)) || false;
+}
+
 function nextCharacterIsText(parent: GenericNode, node: GenericNode): boolean {
   const ind = parent?.children?.findIndex((n: GenericNode) => n === node);
   if (!ind) return false;
@@ -230,8 +238,9 @@ const handlers: Record<string, Handler> = {
     }
   },
   strong(node, state, parent) {
+    const prev = prevCharacterIsText(parent, node);
     const next = nextCharacterIsText(parent, node);
-    if (nodeOnlyHasTextChildren(node) && !next) {
+    if (nodeOnlyHasTextChildren(node) && !(prev || next)) {
       state.write('*');
       state.renderChildren(node);
       state.write('*');
@@ -240,8 +249,9 @@ const handlers: Record<string, Handler> = {
     }
   },
   emphasis(node, state, parent) {
+    const prev = prevCharacterIsText(parent, node);
     const next = nextCharacterIsText(parent, node);
-    if (nodeOnlyHasTextChildren(node) && !next) {
+    if (nodeOnlyHasTextChildren(node) && !prev && !next) {
       state.write('_');
       state.renderChildren(node);
       state.write('_');
@@ -368,6 +378,7 @@ const handlers: Record<string, Handler> = {
       state.renderChildren(node);
       state.write(']');
     } else {
+      // Note that we don't need to protect against the previous character as text
       const next = nextCharacterIsText(parent, node);
       state.write(next ? `#[@${id}]` : `@${id}`);
     }

packages/myst-to-typst/tests/basic.yml

@@ -75,6 +75,22 @@ cases:
               value: 'with trailing text!'
     typst: |-
       This is #strong[strong]with trailing text!
+  - title: strong inside a word
+    mdast:
+      type: root
+      children:
+        - type: paragraph
+          children:
+            - type: text
+              value: 'We say equation'
+            - type: strong
+              children:
+                - type: text
+                  value: 's'
+            - type: text
+              value: ', plural, because there are...'
+    typst: |-
+      We say equation#strong[s], plural, because there are...
   - title: emph with trailing text
     mdast:
       type: root