diff --git a/src/command/render/pandoc.ts b/src/command/render/pandoc.ts
index ca93ea16b1..bebfa93ba3 100644
--- a/src/command/render/pandoc.ts
+++ b/src/command/render/pandoc.ts
@@ -381,7 +381,6 @@ export async function runPandoc(
   ) {
     const projectExtras = options.project?.formatExtras
       ? (await options.project.formatExtras(
-        options.project,
         options.source,
         options.flags || {},
         options.format,
diff --git a/src/command/use/commands/binder/binder.ts b/src/command/use/commands/binder/binder.ts
index 82ee27d6ab..778b749b64 100644
--- a/src/command/use/commands/binder/binder.ts
+++ b/src/command/use/commands/binder/binder.ts
@@ -72,7 +72,7 @@ export const useBinderCommand = new Command()
           doneMessage: "Detected Project configuration:\n",
         },
         () => {
-          return context.environment(context);
+          return context.environment();
         },
       );
 
diff --git a/src/format/html/format-html-bootstrap.ts b/src/format/html/format-html-bootstrap.ts
index 5e75caa7f5..9e3aa1764b 100644
--- a/src/format/html/format-html-bootstrap.ts
+++ b/src/format/html/format-html-bootstrap.ts
@@ -671,7 +671,7 @@ async function processOtherLinks(
     context: ProjectContext,
   ): Promise<OtherLink | undefined> => {
     if (link === "repo") {
-      const env = await context.environment(context);
+      const env = await context.environment();
       if (env.github.repoUrl) {
         return {
           icon: "github",
@@ -685,7 +685,7 @@ async function processOtherLinks(
         );
       }
     } else if (link === "devcontainer") {
-      const env = await context.environment(context);
+      const env = await context.environment();
       if (
         env.github.organization && env.github.repository && env.github.repoUrl
       ) {
@@ -703,7 +703,7 @@ async function processOtherLinks(
         );
       }
     } else if (link === "binder") {
-      const env = await context.environment(context);
+      const env = await context.environment();
       if (env.github.organization && env.github.repository) {
         const containerUrl = binderUrl(
           env.github.organization,
diff --git a/src/project/project-context.ts b/src/project/project-context.ts
index 1f60f266fa..762b1b87ae 100644
--- a/src/project/project-context.ts
+++ b/src/project/project-context.ts
@@ -11,7 +11,7 @@ import { existsSync, walkSync } from "fs/mod.ts";
 import * as ld from "../core/lodash.ts";
 
 import { ProjectType } from "./types/types.ts";
-import { Metadata } from "../config/types.ts";
+import { Format, Metadata, PandocFlags } from "../config/types.ts";
 import {
   kProjectLibDir,
   kProjectOutputDir,
@@ -67,7 +67,7 @@ import {
   projectConfigFile,
   projectVarsFile,
 } from "./project-shared.ts";
-import { RenderFlags } from "../command/render/types.ts";
+import { RenderFlags, RenderServices } from "../command/render/types.ts";
 import { kWebsite } from "./types/website/website-constants.ts";
 
 import { readAndValidateYamlFromFile } from "../core/schema/validated-yaml.ts";
@@ -257,7 +257,7 @@ export async function projectContext(
         }
 
         debug(`projectContext: Found Quarto project in ${dir}`);
-        return {
+        const result: ProjectContext = {
           dir,
           engines,
           files: {
@@ -267,17 +267,25 @@ export async function projectContext(
             configResources: projectConfigResources(dir, projectConfig, type),
           },
           config: projectConfig,
-          formatExtras: type.formatExtras,
           // this is a relatively ugly hack to avoid a circular import chain
           // that causes a deno bundler bug;
           renderFormats,
-          environment,
+          environment: () => environment(result),
           notebookContext,
         };
+        if (type.formatExtras) {
+          result.formatExtras = async (
+            source: string,
+            flags: PandocFlags,
+            format: Format,
+            services: RenderServices,
+          ) => type.formatExtras!(result, source, flags, format, services);
+        }
+        return result;
       } else {
         const { files, engines } = projectInputFiles(dir);
         debug(`projectContext: Found Quarto project in ${dir}`);
-        return {
+        const result = {
           dir,
           engines,
           config: projectConfig,
@@ -288,9 +296,10 @@ export async function projectContext(
             configResources: projectConfigResources(dir, projectConfig),
           },
           renderFormats,
-          environment,
+          environment: () => environment(result),
           notebookContext,
         };
+        return result;
       }
     } else {
       const nextDir = dirname(dir);
@@ -312,7 +321,7 @@ export async function projectContext(
               input: [],
             },
             renderFormats,
-            environment,
+            environment: () => environment(context),
             notebookContext,
           };
           if (Deno.statSync(path).isDirectory) {
diff --git a/src/project/types.ts b/src/project/types.ts
index 28c05a9efa..22ff2af043 100644
--- a/src/project/types.ts
+++ b/src/project/types.ts
@@ -41,8 +41,10 @@ export interface ProjectContext {
   engines: string[];
   files: ProjectFiles;
   config?: ProjectConfig;
+  notebookContext: NotebookContext;
+  outputNameIndex?: Map<string, { file: string; format: Format } | undefined>;
+
   formatExtras?: (
-    project: ProjectContext,
     source: string,
     flags: PandocFlags,
     format: Format,
@@ -56,10 +58,7 @@ export interface ProjectContext {
     project?: ProjectContext,
   ) => Promise<Record<string, Format>>;
 
-  notebookContext: NotebookContext;
-
-  outputNameIndex?: Map<string, { file: string; format: Format } | undefined>;
-  environment: (project: ProjectContext) => Promise<ProjectEnvironment>;
+  environment: () => Promise<ProjectEnvironment>;
 }
 
 export interface ProjectFiles {