diff --git a/Cargo.lock b/Cargo.lock
index 9299039..a4b3d0a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -38,9 +38,9 @@ dependencies = [
 
 [[package]]
 name = "dprint-core"
-version = "0.39.0"
+version = "0.42.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "558e1faeec0ba98e38d61ec6c71a3bb80e68d6fde96b5663a739c79f43eba058"
+checksum = "690b3f34a0c0825e5ebbc58f0f0ddf979a6f5fff32f7317886d4917507035760"
 dependencies = [
  "bumpalo",
  "fnv",
@@ -49,9 +49,9 @@ dependencies = [
 
 [[package]]
 name = "dprint-development"
-version = "0.3.0"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8241dcdcf5dff04c1eb8268411d127fdaf846ea4605cb2daf58351ed4ff33a36"
+checksum = "11257da1cf6728775dbae962a9c65c9745e8d7c749e3e41beca18a734279630e"
 dependencies = [
  "console",
  "similar",
@@ -59,7 +59,7 @@ dependencies = [
 
 [[package]]
 name = "dprint-plugin-markdown"
-version = "0.7.1"
+version = "0.8.0"
 dependencies = [
  "dprint-core",
  "dprint-development",
diff --git a/Cargo.toml b/Cargo.toml
index c4ce130..926f367 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "dprint-plugin-markdown"
 description = "Markdown formatter for dprint."
-version = "0.7.1"
+version = "0.8.0"
 authors = ["David Sherret <dsherret@gmail.com>"]
 license = "MIT"
 edition = "2018"
@@ -24,12 +24,12 @@ wasm = ["serde_json", "dprint-core/wasm"]
 tracing = ["dprint-core/tracing"]
 
 [dependencies]
-dprint-core = { version = "0.39.0", features = ["formatting"] }
+dprint-core = { version = "0.42.0", features = ["formatting"] }
 pulldown-cmark = { version = "0.8.0", default-features = false }
 serde = { version = "1.0.88", features = ["derive"] }
 serde_json = { version = "1.0", optional = true }
 regex = "1"
 
 [dev-dependencies]
-dprint-development = "0.3.0"
+dprint-development = "0.4.0"
 serde_json = { version = "1.0" }
diff --git a/src/format_text.rs b/src/format_text.rs
index eb96ed3..0b64b26 100644
--- a/src/format_text.rs
+++ b/src/format_text.rs
@@ -1,5 +1,6 @@
 use dprint_core::formatting::*;
 use dprint_core::configuration::{resolve_new_line_kind};
+use dprint_core::types::ErrBox;
 
 use super::configuration::Configuration;
 use super::parsing::{parse_cmark_ast, parse_yaml_header, parse_node, Context, file_has_ignore_file_directive};
@@ -10,8 +11,8 @@ use super::parsing::{parse_cmark_ast, parse_yaml_header, parse_node, Context, fi
 pub fn format_text(
     file_text: &str,
     config: &Configuration,
-    format_code_block_text: Box<dyn Fn(&str, &str, u32) -> Result<String, String>>,
-) -> Result<String, String> {
+    format_code_block_text: impl FnMut(&str, &str, u32) -> Result<String, ErrBox>,
+) -> Result<String, ErrBox> {
     let (source_file, markdown_text) = match parse_source_file(file_text, config)? {
         ParseFileResult::IgnoreFile => return Ok(file_text.to_string()),
         ParseFileResult::SourceFile(file) => file,
diff --git a/src/parsing/parser_types.rs b/src/parsing/parser_types.rs
index fd6e075..70e9f6a 100644
--- a/src/parsing/parser_types.rs
+++ b/src/parsing/parser_types.rs
@@ -1,5 +1,7 @@
 use regex::Regex;
-use super::super::configuration::Configuration;
+use dprint_core::types::ErrBox;
+
+use crate::configuration::Configuration;
 use super::utils::*;
 
 pub struct Context<'a> {
@@ -10,7 +12,7 @@ pub struct Context<'a> {
     /** The current indentation level within the file being formatted. */
     pub raw_indent_level: u32,
     pub is_in_list_count: u32,
-    pub format_code_block_text: Box<dyn Fn(&str, &str, u32) -> Result<String, String>>,
+    pub format_code_block_text: Box<dyn FnMut(&str, &str, u32) -> Result<String, ErrBox> + 'a>,
     pub ignore_regex: Regex,
     pub ignore_start_regex: Regex,
     pub ignore_end_regex: Regex,
@@ -20,7 +22,7 @@ impl<'a> Context<'a> {
     pub fn new(
         file_text: &'a str,
         configuration: &'a Configuration,
-        format_code_block_text: Box<dyn Fn(&str, &str, u32) -> Result<String, String>>
+        format_code_block_text: impl FnMut(&str, &str, u32) -> Result<String, ErrBox> + 'a,
     ) -> Context<'a> {
         Context {
             file_text,
@@ -28,7 +30,7 @@ impl<'a> Context<'a> {
             indent_level: 0,
             raw_indent_level: 0,
             is_in_list_count: 0,
-            format_code_block_text,
+            format_code_block_text: Box::new(format_code_block_text),
             ignore_regex: get_ignore_comment_regex(&configuration.ignore_directive),
             ignore_start_regex: get_ignore_comment_regex(&configuration.ignore_start_directive),
             ignore_end_regex: get_ignore_comment_regex(&configuration.ignore_end_directive),
@@ -39,7 +41,7 @@ impl<'a> Context<'a> {
         self.is_in_list_count > 0
     }
 
-    pub fn format_text(&self, tag: &str, text: &str) -> Result<String, String> {
+    pub fn format_text(&mut self, tag: &str, text: &str) -> Result<String, ErrBox> {
         let line_width = std::cmp::max(10, self.configuration.line_width as i32 - self.indent_level as i32) as u32;
         (self.format_code_block_text)(tag, text, line_width)
     }
diff --git a/src/wasm_plugin.rs b/src/wasm_plugin.rs
index fe54cfe..636cfab 100644
--- a/src/wasm_plugin.rs
+++ b/src/wasm_plugin.rs
@@ -1,63 +1,86 @@
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 use std::collections::HashMap;
 
 use dprint_core::generate_plugin_code;
+use dprint_core::configuration::{ConfigKeyMap, GlobalConfiguration, ResolveConfigurationResult};
+use dprint_core::plugins::{PluginHandler, PluginInfo};
+use dprint_core::types::ErrBox;
 use super::configuration::{Configuration, resolve_config};
 
-fn get_plugin_config_key() -> String {
-    String::from("markdown")
+struct MarkdownPluginHandler {
 }
 
-fn get_plugin_file_extensions() -> Vec<String> {
-    vec![String::from("md")]
+impl MarkdownPluginHandler {
+    pub const fn new() -> Self {
+        MarkdownPluginHandler {}
+    }
 }
 
-fn format_text(_: &PathBuf, file_text: &str, config: &Configuration) -> Result<String, String> {
-    return super::format_text(
-        file_text,
-        config,
-        Box::new(|tag, file_text, line_width| {
-            if let Some(ext) = tag_to_extension(tag) {
-                let file_path = PathBuf::from(format!("file.{}", ext));
-                let mut additional_config = HashMap::new();
-                additional_config.insert("lineWidth".into(), (line_width as i32).into());
-                format_with_host(&file_path, file_text.to_string(), &additional_config)
-            } else {
-                Ok(file_text.to_string())
-            }
-        })
-    );
-
-    fn tag_to_extension(tag: &str) -> Option<&'static str> {
-        match tag.trim().to_lowercase().as_str() {
-            "typescript" | "ts" => Some("ts"),
-            "tsx" => Some("tsx"),
-            "javascript" | "js" => Some("js"),
-            "jsx" => Some("jsx"),
-            "json" | "jsonc" => Some("json"),
-            "rust" | "rs" => Some("rs"),
-            "csharp" | "cs" => Some("cs"),
-            "visualbasic" | "vb" => Some("vb"),
-            "css" => Some("css"),
-            "less" => Some("less"),
-            "toml" => Some("toml"),
-            "scss" => Some("scss"),
-            "vue" => Some("vue"),
-            _ => None,
+impl PluginHandler<Configuration> for MarkdownPluginHandler {
+    fn resolve_config(
+        &mut self,
+        config: ConfigKeyMap,
+        global_config: &GlobalConfiguration,
+    ) -> ResolveConfigurationResult<Configuration> {
+        resolve_config(config, global_config)
+    }
+
+    fn get_plugin_info(&mut self) -> PluginInfo {
+        PluginInfo {
+            name: env!("CARGO_PKG_NAME").to_string(),
+            version: env!("CARGO_PKG_VERSION").to_string(),
+            config_key: "markdown".to_string(),
+            file_extensions: vec!["md".to_string()],
+            help_url: "https://dprint.dev/plugins/markdown".to_string(),
+            config_schema_url: "".to_string(), // none until https://github.com/microsoft/vscode/issues/98443 is resolved
         }
     }
-}
 
-fn get_plugin_help_url() -> String {
-    String::from("https://dprint.dev/plugins/markdown")
-}
+    fn get_license_text(&mut self) -> String {
+        std::str::from_utf8(include_bytes!("../LICENSE")).unwrap().into()
+    }
 
-fn get_plugin_config_schema_url() -> String {
-    String::new() // none until https://github.com/microsoft/vscode/issues/98443 is resolved
-}
+    fn format_text(
+        &mut self,
+        _file_path: &Path,
+        file_text: &str,
+        config: &Configuration,
+        mut format_with_host: impl FnMut(&Path, String, &ConfigKeyMap) -> Result<String, ErrBox>,
+    ) -> Result<String, ErrBox> {
+        return super::format_text(
+            file_text,
+            config,
+            |tag, file_text, line_width| {
+                if let Some(ext) = tag_to_extension(tag) {
+                    let file_path = PathBuf::from(format!("file.{}", ext));
+                    let mut additional_config = HashMap::new();
+                    additional_config.insert("lineWidth".into(), (line_width as i32).into());
+                    format_with_host(&file_path, file_text.to_string(), &additional_config)
+                } else {
+                    Ok(file_text.to_string())
+                }
+            }
+        );
 
-fn get_plugin_license_text() -> String {
-    std::str::from_utf8(include_bytes!("../LICENSE")).unwrap().into()
+        fn tag_to_extension(tag: &str) -> Option<&'static str> {
+            match tag.trim().to_lowercase().as_str() {
+                "typescript" | "ts" => Some("ts"),
+                "tsx" => Some("tsx"),
+                "javascript" | "js" => Some("js"),
+                "jsx" => Some("jsx"),
+                "json" | "jsonc" => Some("json"),
+                "rust" | "rs" => Some("rs"),
+                "csharp" | "cs" => Some("cs"),
+                "visualbasic" | "vb" => Some("vb"),
+                "css" => Some("css"),
+                "less" => Some("less"),
+                "toml" => Some("toml"),
+                "scss" => Some("scss"),
+                "vue" => Some("vue"),
+                _ => None,
+            }
+        }
+    }
 }
 
-generate_plugin_code!();
+generate_plugin_code!(MarkdownPluginHandler, MarkdownPluginHandler::new());
diff --git a/tests/newline_test.rs b/tests/newline_test.rs
index dfddaa1..fe62f1b 100644
--- a/tests/newline_test.rs
+++ b/tests/newline_test.rs
@@ -7,7 +7,7 @@ fn test_issue22_with_carriage_return_line_feeds() {
     let result = format_text(
         &"```\r\ntest\r\n\r\ntest\r\n```\r\n",
         &config,
-        Box::new(|_, file_text, _| Ok(file_text.to_string())),
+        |_, file_text, _| Ok(file_text.to_string()),
     ).unwrap();
     assert_eq!(result, "```\ntest\n\ntest\n```\n");
 }
@@ -18,7 +18,7 @@ fn test_issue26_with_carriage_return_line_feeds() {
     let result = format_text(
         &"Testing:\r\n<!-- dprint-ignore -->\r\n```json\r\ntesting\r\n```\r\n",
         &config,
-        Box::new(|_, file_text, _| Ok(file_text.to_string())),
+        |_, file_text, _| Ok(file_text.to_string()),
     ).unwrap();
     assert_eq!(result, "Testing:\n\n<!-- dprint-ignore -->\n```json\ntesting\n```\n");
 }
@@ -31,7 +31,7 @@ fn test_issue35_convert_two_spaces_end_of_line_to_hard_break() {
     let result = format_text(
         &"testing  \nasdf",
         &config,
-        Box::new(|_, file_text, _| Ok(file_text.to_string())),
+        |_, file_text, _| Ok(file_text.to_string()),
     ).unwrap();
     assert_eq!(result, "testing\\\nasdf\n");
 }
@@ -42,7 +42,7 @@ fn test_issue35_ignore_two_spaces_before_hard_break() {
     let result = format_text(
         &"testing  \\\nasdf",
         &config,
-        Box::new(|_, file_text, _| Ok(file_text.to_string())),
+        |_, file_text, _| Ok(file_text.to_string()),
     ).unwrap();
     assert_eq!(result, "testing\\\nasdf\n");
 }
diff --git a/tests/run_specs_test.rs b/tests/run_specs_test.rs
index cb060f4..d430e15 100644
--- a/tests/run_specs_test.rs
+++ b/tests/run_specs_test.rs
@@ -27,14 +27,14 @@ fn test_specs() {
                 format_text(
                     &file_text,
                     &config_result.config,
-                    Box::new(|tag, file_text, line_width| {
+                    |tag, file_text, line_width| {
                         let end = format!("_formatted_{}", line_width);
                         if tag == "format" && !file_text.ends_with(&end) {
                             Ok(format!("{}{}\n\n", file_text.to_string(), end))
                         } else {
                             Ok(file_text.to_string())
                         }
-                    }),
+                    },
                 )
             }
         },
@@ -46,14 +46,14 @@ fn test_specs() {
                 return serde_json::to_string(&trace_file(
                     &_file_text,
                     &config_result.config,
-                    Box::new(|tag, file_text, line_width| {
+                    |tag, file_text, line_width| {
                         let end = format!("_formatted_{}", line_width);
                         if tag == "format" && !file_text.ends_with(&end) {
                             Ok(format!("{}{}\n\n", file_text.to_string(), end))
                         } else {
                             Ok(file_text.to_string())
                         }
-                    }),
+                    },
                 )).unwrap();
             }