diff --git a/editors/vscode/src/compiler.cjs b/editors/vscode/src/compiler.cjs
index 70ad9e93..e8078845 100644
--- a/editors/vscode/src/compiler.cjs
+++ b/editors/vscode/src/compiler.cjs
@@ -1,6 +1,6 @@
 "use strict";
 // Generated by scripts/build-editor-compiler.mjs. Do not edit directly.
-// WRN editor compiler source hash: 653a88ea2a34e9c446fc55b268f3ba9c5d27f9e114fc6aa9228ef560e1fd616d
+// WRN editor compiler source hash: 2987e8e9d91b793818a195395e740d35d0d5c2a320ff1c3a5ae77363850c7b8e
 // WRN editor compiler generator hash: a54ca847c758bc98d8e353ad6d70088df31de1820f6cf9d1c3462505f563e6b8
 // Generated with TypeScript: 6.0.3
 const __nodeRequire = require;
@@ -7069,12 +7069,13 @@ function parseHtmlView(src, pos) {
         if (quote !== '"' && quote !== "'")
             return fail("Expected a quoted attribute value");
         i++;
-        // Backslash-escapes the delimiter (and anything else) so an attribute
-        // value -- e.g. an `api="fn({ a: \"b\" })"` call expression -- can carry
-        // the same quote character it's wrapped in.
+        // Backslash escapes the delimiter -- so an attribute value such as the
+        // call expression `api="fn({ a: \"b\" })"` can carry the same quote
+        // character it's wrapped in -- and escapes itself. Every other backslash
+        // is a literal one, so a value like "C:\Users\name" survives intact.
         let value = "";
         while (i < src.length && src[i] !== quote) {
-            if (src[i] === "\\" && i + 1 < src.length) {
+            if (src[i] === "\\" && (src[i + 1] === quote || src[i + 1] === "\\")) {
                 value += src[i + 1];
                 i += 2;
                 continue;
diff --git a/editors/vscode/src/extension.bundle.cjs b/editors/vscode/src/extension.bundle.cjs
index 1836adfa..5d3fbb9d 100644
--- a/editors/vscode/src/extension.bundle.cjs
+++ b/editors/vscode/src/extension.bundle.cjs
@@ -1,4 +1,4 @@
-// WRN editor extension source hash: feecaeb59a41771bd1a35be172bf89cec8451468a4bf817f176cc54de3d8267a
+// WRN editor extension source hash: 01c5b97824df25422267667a6083adbdc0a5dc14ae7fbec5345084a214d40523
 // WRN editor extension generator hash: 456d1d614e44e5fb1f19b784176c09cf2ade9b64ef73a17934c2698150b62728
 "use strict";
 var __commonJS = (cb, mod) => () => (mod || cb((mod = { exports: {} }).exports, mod), mod.exports);
diff --git a/editors/vscode/src/language-server.cjs b/editors/vscode/src/language-server.cjs
index 0f23ad08..cbbc564d 100644
--- a/editors/vscode/src/language-server.cjs
+++ b/editors/vscode/src/language-server.cjs
@@ -1,5 +1,5 @@
 #!/usr/bin/env node
-// WRN editor language server source hash: 613d98d8154714b7e5799b02a27e16cd707a50bc2b5ae7d9fbb3f0834b9251e6
+// WRN editor language server source hash: 92a9c7cd3babafdbc518a6f20c0c8f0025e49e92a28a2fa5598c8bb7a858e800
 // WRN editor language server generator hash: f593a44aaf05495b789ce7a3086bee1eebb951b884d41c0e017bbcfe5f547e72
 // @bun @bun-cjs
 (function(exports, require, module, __filename, __dirname) {var __create = Object.create;
@@ -172043,7 +172043,7 @@ function parseHtmlView(src, pos) {
     i++;
     let value = "";
     while (i < src.length && src[i] !== quote) {
-      if (src[i] === "\\" && i + 1 < src.length) {
+      if (src[i] === "\\" && (src[i + 1] === quote || src[i + 1] === "\\")) {
         value += src[i + 1];
         i += 2;
         continue;
diff --git a/packages/cli/src/migrations/apis-block.ts b/packages/cli/src/migrations/apis-block.ts
index 9d1e0d83..8851438a 100644
--- a/packages/cli/src/migrations/apis-block.ts
+++ b/packages/cli/src/migrations/apis-block.ts
@@ -276,7 +276,9 @@ export function migrateApisBlock(
     parse(after);
   } catch (error) {
     const message = error instanceof Error ? error.message : String(error);
-    throw new Error(`apis-block migration produced source that failed to parse: ${message}`);
+    throw new Error(`apis-block migration produced source that failed to parse: ${message}`, {
+      cause: error,
+    });
   }
 
   return { source: after, changed: true };
diff --git a/packages/cli/src/migrations/mode-functions.ts b/packages/cli/src/migrations/mode-functions.ts
index 31f8c2e3..9135916e 100644
--- a/packages/cli/src/migrations/mode-functions.ts
+++ b/packages/cli/src/migrations/mode-functions.ts
@@ -266,7 +266,9 @@ export function migrateModeFunctions(
       parse(after);
     } catch (error) {
       const message = error instanceof Error ? error.message : String(error);
-      throw new Error(`mode-functions migration produced source that failed to parse: ${message}`);
+      throw new Error(`mode-functions migration produced source that failed to parse: ${message}`, {
+        cause: error,
+      });
     }
   }
 
diff --git a/packages/compiler/test/apis-server-emit.test.ts b/packages/compiler/test/apis-server-emit.test.ts
index 3f6e2248..43536044 100644
--- a/packages/compiler/test/apis-server-emit.test.ts
+++ b/packages/compiler/test/apis-server-emit.test.ts
@@ -1,5 +1,5 @@
 import { afterEach, expect, test } from "bun:test";
-import { mkdirSync, mkdtempSync, readFileSync, rmSync, symlinkSync, writeFileSync } from "node:fs";
+import { mkdirSync, mkdtempSync, rmSync, symlinkSync, writeFileSync } from "node:fs";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import { parse } from "@wrnexus/syntax";
diff --git a/packages/dev-server/test/server-fn-rpc-request-context.test.ts b/packages/dev-server/test/server-fn-rpc-request-context.test.ts
index d08732d9..ba2198ac 100644
--- a/packages/dev-server/test/server-fn-rpc-request-context.test.ts
+++ b/packages/dev-server/test/server-fn-rpc-request-context.test.ts
@@ -9,7 +9,7 @@ import { withServerFnRequestContext } from "../src/index.ts";
 // request context, not `undefined`.
 test("a handler invoked through the server-function RPC path can read the request context", async () => {
   let seen: unknown;
-  const innerHandler = async (request: Request): Promise<Response> => {
+  const innerHandler = async (_request: Request): Promise<Response> => {
     seen = getRequestContext();
     return new Response("ok");
   };