🙏 Make `typedoc-plugin-markdown` works with MDX2

[dimaMachina]

Currently using typedoc-plugin-markdown with MDX2 can't be possible as starting from MDX2 it's necessary to escape { and < open brackets because MDX2 parses < as JSX tag and { as JS expression.

typedoc-plugin-markdown escapes only > closing bracket but it's unnecessary, also he adds double whitespace before } closing bracket that also redundant.

I fixed these issues in typedoc-plugin-markdown@3.11.14 in the following patch:

diff --git a/node_modules/typedoc-plugin-markdown/dist/resources/helpers/declaration-title.js b/node_modules/typedoc-plugin-markdown/dist/resources/helpers/declaration-title.js
index ecf2699..3953091 100644
--- a/node_modules/typedoc-plugin-markdown/dist/resources/helpers/declaration-title.js
+++ b/node_modules/typedoc-plugin-markdown/dist/resources/helpers/declaration-title.js
@@ -21,9 +21,9 @@ function default_1() {
         }
         md.push(`${this.flags.isRest ? '... ' : ''} **${(0, utils_1.escapeChars)(this.name)}**`);
         if (this instanceof typedoc_1.DeclarationReflection && this.typeParameters) {
-            md.push(`<${this.typeParameters
+            md.push(`\\<${this.typeParameters // Escape `<` because MDX2 parse him as JSX tags
                 .map((typeParameter) => `\`${typeParameter.name}\``)
-                .join(', ')}\\>`);
+                .join(', ')}>`);
         }
         if (!((_a = this.parent) === null || _a === void 0 ? void 0 : _a.kindOf(typedoc_1.ReflectionKind.Enum))) {
             md.push(getType(this));
diff --git a/node_modules/typedoc-plugin-markdown/dist/resources/helpers/reflection-title.js b/node_modules/typedoc-plugin-markdown/dist/resources/helpers/reflection-title.js
index 6363a66..52b1ae3 100644
--- a/node_modules/typedoc-plugin-markdown/dist/resources/helpers/reflection-title.js
+++ b/node_modules/typedoc-plugin-markdown/dist/resources/helpers/reflection-title.js
@@ -19,7 +19,7 @@ function default_1(theme) {
                 const typeParameters = this.model.typeParameters
                     .map((typeParameter) => typeParameter.name)
                     .join(', ');
-                title.push(`<${typeParameters}${shouldEscape ? '\\>' : '>'}`);
+                title.push(`\\<${typeParameters}>`); // Escape `<` because MDX2 parse him as JSX tag
             }
         }
         return title.join('');
diff --git a/node_modules/typedoc-plugin-markdown/dist/resources/helpers/signature-title.js b/node_modules/typedoc-plugin-markdown/dist/resources/helpers/signature-title.js
index 9046905..1d3fdb3 100644
--- a/node_modules/typedoc-plugin-markdown/dist/resources/helpers/signature-title.js
+++ b/node_modules/typedoc-plugin-markdown/dist/resources/helpers/signature-title.js
@@ -20,9 +20,9 @@ function default_1() {
             md.push(`**${this.name}**`);
         }
         if (this.typeParameters) {
-            md.push(`<${this.typeParameters
+            md.push(`\\<${this.typeParameters // Escape `<` because MDX2 parse him as JSX tag
                 .map((typeParameter) => `\`${typeParameter.name}\``)
-                .join(', ')}\\>`);
+                .join(', ')}>`);
         }
         md.push(`(${getParameters(this.parameters)})`);
         if (this.type && !((_b = this.parent) === null || _b === void 0 ? void 0 : _b.kindOf(typedoc_1.ReflectionKind.Constructor))) {
diff --git a/node_modules/typedoc-plugin-markdown/dist/resources/helpers/type.js b/node_modules/typedoc-plugin-markdown/dist/resources/helpers/type.js
index d2afa18..9becfd8 100644
--- a/node_modules/typedoc-plugin-markdown/dist/resources/helpers/type.js
+++ b/node_modules/typedoc-plugin-markdown/dist/resources/helpers/type.js
@@ -90,7 +90,8 @@ function getDeclarationType(model) {
                     ? `= ${(0, utils_1.escapeChars)(obj.defaultValue)}`
                     : ''}`;
             });
-        return `{ ${indexSignature ? indexSignature : ''}${types ? types.join('; ') : ''} }${model.defaultValue && model.defaultValue !== '...'
+        // Escape `{` because MDX2 parse him as JS expression
+        return `\\{ ${indexSignature ? indexSignature : ''}${types ? types.join('; ') : ''}}${model.defaultValue && model.defaultValue !== '...'
             ? `= ${(0, utils_1.escapeChars)(model.defaultValue)}`
             : ''}`;
     }
@@ -99,9 +100,9 @@ function getDeclarationType(model) {
 function getFunctionType(modelSignatures) {
     const functions = modelSignatures.map((fn) => {
         const typeParams = fn.typeParameters
-            ? `<${fn.typeParameters
+            ? `\\<${fn.typeParameters // Escape `<` because MDX2 parse him as JSX tag
                 .map((typeParameter) => typeParameter.name)
-                .join(', ')}\\>`
+                .join(', ')}>`
             : [];
         const params = fn.parameters
             ? fn.parameters.map((param) => {
@@ -128,9 +129,9 @@ function getReferenceType(model, emphasis) {
                 : `\`${model.name}\``);
         }
         if (model.typeArguments && model.typeArguments.length > 0) {
-            reflection.push(`<${model.typeArguments
+            reflection.push(`\\<${model.typeArguments // Escape `<` because MDX2 parse him as JSX tag
                 .map((typeArgument) => Handlebars.helpers.type.call(typeArgument))
-                .join(', ')}\\>`);
+                .join(', ')}>`);
         }
         return reflection.join('');
     }
diff --git a/node_modules/typedoc-plugin-markdown/dist/utils.js b/node_modules/typedoc-plugin-markdown/dist/utils.js
index dc6b9e1..991fe79 100644
--- a/node_modules/typedoc-plugin-markdown/dist/utils.js
+++ b/node_modules/typedoc-plugin-markdown/dist/utils.js
@@ -11,7 +11,8 @@ function formatContents(contents) {
 exports.formatContents = formatContents;
 function escapeChars(str) {
     return str
-        .replace(/>/g, '\\>')
+        .replace(/</g, '\\<') // Escape `<` because MDX2 parse him as JSX tag
+        .replace(/{/g, '\\{') // Escape `{` because MDX2 parse him as JS expression
         .replace(/_/g, '\\_')
         .replace(/`/g, '\\`')
         .replace(/\|/g, '\\|');

P.S. I hope one day I will be able to remove the unnecessary patch and the support of MDX2 in typedoc-plugin-markdown will be out-of-box.

[tgreyuk]

thanks - agreed this should be the default. Docusaurus doesn't (yet) support MDX2 which is why its done like this, but will take a look at a workaround for that.

[balazsorban44]

I was on a similar journey and decided to just tell Nextra to interpret the files as regular Markdown:

#386

I think it does not make sense(?) to use MDX as the content would look weird in IDEs like VSCode, but correct me if you disagree.

[birkskyum]

thanks - agreed this should be the default. Docusaurus doesn't (yet) support MDX2 which is why its done like this, but will take a look at a workaround for that.

@tgreyuk , awesome to see this land in the next version of the plugin! :)

[aamir1995]

thanks - agreed this should be the default. Docusaurus doesn't (yet) support MDX2 which is why its done like this, but will take a look at a workaround for that.

This version is still compatible with MDX V1, is my assumption correct?

[birkskyum]

Is this closed by 3.17.0 ?

[birkskyum]

Is mdx 2 or 3 (released Oct '23) going to be in the upcoming v4 release?

[tgreyuk]

Looking at the migration guide there is no output that will cause any breaking change. Additionally the output is parsed and checked with remark-mdx. So yes the intention is that both mdx2 and 3 is supported.