From bf22f4dfb1282b91c799fe0b97f08d3afb73e1fc Mon Sep 17 00:00:00 2001
From: Paul Douglas Brimicombe <paul.brimicombe@bbc.co.uk>
Date: Fri, 14 Feb 2025 11:54:01 +0000
Subject: [PATCH 1/2] Use a separate compiler instance per snippet

---
 src/SnippetCompiler.ts             |  8 ++++----
 test/TypeScriptDocsVerifierSpec.ts | 25 +++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/src/SnippetCompiler.ts b/src/SnippetCompiler.ts
index aa91742..e41998f 100644
--- a/src/SnippetCompiler.ts
+++ b/src/SnippetCompiler.ts
@@ -24,7 +24,7 @@ export type SnippetCompilationResult = {
 };
 
 export class SnippetCompiler {
-  private readonly compiler: TSNode.Service;
+  private readonly compilerConfig: TSNode.CreateOptions;
 
   constructor(
     private readonly workingDirectory: string,
@@ -35,11 +35,10 @@ export class SnippetCompiler {
       packageDefinition.packageRoot,
       project
     );
-    const tsConfig = {
+    this.compilerConfig = {
       ...(configOptions.config as TSNode.CreateOptions),
       transpileOnly: false,
     };
-    this.compiler = TSNode.create(tsConfig);
   }
 
   private static loadTypeScriptConfig(
@@ -124,7 +123,8 @@ export class SnippetCompiler {
     const id = process.hrtime.bigint().toString();
     const codeFile = path.join(this.workingDirectory, `block-${id}.${type}`);
     await fsExtra.writeFile(codeFile, code);
-    this.compiler.compile(code, codeFile);
+    const compiler = TSNode.create(this.compilerConfig);
+    compiler.compile(code, codeFile);
   }
 
   private removeTemporaryFilePaths(
diff --git a/test/TypeScriptDocsVerifierSpec.ts b/test/TypeScriptDocsVerifierSpec.ts
index c8c6dd7..57d558b 100644
--- a/test/TypeScriptDocsVerifierSpec.ts
+++ b/test/TypeScriptDocsVerifierSpec.ts
@@ -388,6 +388,31 @@ export const bob = () => (<div></div>);
       }
     );
 
+    verify.it("compiles snippets independently", async () => {
+      const snippet1 = `interface Foo { bar: 123 }`;
+      const snippet2 = `interface Foo { bar: () => void }`;
+      const typeScriptMarkdown = wrapSnippet(snippet1) + wrapSnippet(snippet2);
+      await createProject({
+        markdownFiles: [{ name: "README.md", contents: typeScriptMarkdown }],
+      });
+      return await TypeScriptDocsVerifier.compileSnippets().should.eventually.eql(
+        [
+          {
+            file: "README.md",
+            index: 1,
+            snippet: snippet1,
+            linesWithErrors: [],
+          },
+          {
+            file: "README.md",
+            index: 2,
+            snippet: snippet2,
+            linesWithErrors: [],
+          },
+        ]
+      );
+    });
+
     verify.it(
       "compiles snippets containing modules",
       genSnippet,

From 4506393879b295585d7f62501bad43eb0075151d Mon Sep 17 00:00:00 2001
From: Paul Douglas Brimicombe <paul.brimicombe@bbc.co.uk>
Date: Fri, 14 Feb 2025 11:56:05 +0000
Subject: [PATCH 2/2] Bump version

---
 CHANGELOG    | 4 ++++
 package.json | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG b/CHANGELOG
index 12b7700..8ede609 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+## [2.5.3]
+### Changed
+- Use a separate `ts-node` compiler per-snippet to ensure that compilation of snippets is independent
+
 ## [2.5.2]
 ### Removed
 - Obsolete Travis CI build badge from README
diff --git a/package.json b/package.json
index c56623c..0e9d117 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
     "typescript",
     "verify"
   ],
-  "version": "2.5.2",
+  "version": "2.5.3",
   "main": "dist/index.js",
   "@types": "dist/index.d.ts",
   "bin": {