diff --git a/package-lock.json b/package-lock.json
index 483f2e5..ab01127 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,7 +14,8 @@
       ],
       "devDependencies": {
         "concurrently": "^9.1.2",
-        "typescript": "^7.0.2"
+        "typescript": "^7.0.2",
+        "typescript-ast": "npm:typescript@^5.9.3"
       },
       "engines": {
         "node": ">=20.19"
@@ -2777,6 +2778,21 @@
         "@typescript/typescript-win32-x64": "7.0.2"
       }
     },
+    "node_modules/typescript-ast": {
+      "name": "typescript",
+      "version": "5.9.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
+      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    },
     "node_modules/undici-types": {
       "version": "8.9.0",
       "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-8.9.0.tgz",
diff --git a/package.json b/package.json
index 8717c74..d8b71b7 100644
--- a/package.json
+++ b/package.json
@@ -28,6 +28,7 @@
   },
   "devDependencies": {
     "concurrently": "^9.1.2",
-    "typescript": "^7.0.2"
+    "typescript": "^7.0.2",
+    "typescript-ast": "npm:typescript@^5.9.3"
   }
 }
diff --git a/scripts/i18n-catalog-check.mjs b/scripts/i18n-catalog-check.mjs
index 289aa8d..7281af1 100644
--- a/scripts/i18n-catalog-check.mjs
+++ b/scripts/i18n-catalog-check.mjs
@@ -12,7 +12,21 @@
  * in the file looking correct, is never looked up, and the app renders English
  * for ever. Nothing warns, because a catalogue is only ever read by key.
  */
-import ts from "typescript";
+/*
+ * The parser, not the compiler.
+ *
+ * TypeScript 7 is the native port: its package ships a `tsc` shim over a Go
+ * binary and nothing else, so `typescript` now exports `version` and
+ * `versionMajorMinor` and no compiler API at all. Every `ts.createSourceFile`
+ * in this directory started throwing "Cannot read properties of undefined
+ * (reading 'Latest')" the day the bump landed, and nothing noticed, because no
+ * workflow runs these.
+ *
+ * `typescript-ast` is an npm alias for the last TypeScript that carries the JS
+ * API (see package.json). It parses; `typescript` still type-checks and builds.
+ * Two entries, two jobs -- not a version someone forgot to remove.
+ */
+import ts from "typescript-ast";
 import { readFileSync, globSync } from "node:fs";
 
 const wanted = new Set();
diff --git a/scripts/i18n-coverage.mjs b/scripts/i18n-coverage.mjs
index efd496d..024aa3c 100755
--- a/scripts/i18n-coverage.mjs
+++ b/scripts/i18n-coverage.mjs
@@ -11,7 +11,21 @@
  * exits non-zero only with --check, so CI can be told to fail on regressions
  * later, once the number is low enough for that to mean something.
  */
-import ts from "typescript";
+/*
+ * The parser, not the compiler.
+ *
+ * TypeScript 7 is the native port: its package ships a `tsc` shim over a Go
+ * binary and nothing else, so `typescript` now exports `version` and
+ * `versionMajorMinor` and no compiler API at all. Every `ts.createSourceFile`
+ * in this directory started throwing "Cannot read properties of undefined
+ * (reading 'Latest')" the day the bump landed, and nothing noticed, because no
+ * workflow runs these.
+ *
+ * `typescript-ast` is an npm alias for the last TypeScript that carries the JS
+ * API (see package.json). It parses; `typescript` still type-checks and builds.
+ * Two entries, two jobs -- not a version someone forgot to remove.
+ */
+import ts from "typescript-ast";
 import { readFileSync, globSync } from "node:fs";
 
 /** Attributes a person reads. `className` and `key` are not among them. */
diff --git a/scripts/i18n-extract.mjs b/scripts/i18n-extract.mjs
index 9960137..acec82b 100644
--- a/scripts/i18n-extract.mjs
+++ b/scripts/i18n-extract.mjs
@@ -12,7 +12,21 @@
  *   node scripts/i18n-extract.mjs <file...>   rewrite in place
  *   node scripts/i18n-extract.mjs --dry <file...>
  */
-import ts from "typescript";
+/*
+ * The parser, not the compiler.
+ *
+ * TypeScript 7 is the native port: its package ships a `tsc` shim over a Go
+ * binary and nothing else, so `typescript` now exports `version` and
+ * `versionMajorMinor` and no compiler API at all. Every `ts.createSourceFile`
+ * in this directory started throwing "Cannot read properties of undefined
+ * (reading 'Latest')" the day the bump landed, and nothing noticed, because no
+ * workflow runs these.
+ *
+ * `typescript-ast` is an npm alias for the last TypeScript that carries the JS
+ * API (see package.json). It parses; `typescript` still type-checks and builds.
+ * Two entries, two jobs -- not a version someone forgot to remove.
+ */
+import ts from "typescript-ast";
 import { readFileSync, writeFileSync } from "node:fs";
 
 const ATTRS = new Set(["title", "aria-label", "placeholder", "alt", "label", "hint", "confirmLabel", "description"]);
diff --git a/scripts/i18n-literals.mjs b/scripts/i18n-literals.mjs
index d561267..b26e506 100644
--- a/scripts/i18n-literals.mjs
+++ b/scripts/i18n-literals.mjs
@@ -18,7 +18,21 @@
  * string that is neither -- one no catalogue has a key for, which therefore
  * cannot be translated at all, however many languages ship.
  */
-import ts from "typescript";
+/*
+ * The parser, not the compiler.
+ *
+ * TypeScript 7 is the native port: its package ships a `tsc` shim over a Go
+ * binary and nothing else, so `typescript` now exports `version` and
+ * `versionMajorMinor` and no compiler API at all. Every `ts.createSourceFile`
+ * in this directory started throwing "Cannot read properties of undefined
+ * (reading 'Latest')" the day the bump landed, and nothing noticed, because no
+ * workflow runs these.
+ *
+ * `typescript-ast` is an npm alias for the last TypeScript that carries the JS
+ * API (see package.json). It parses; `typescript` still type-checks and builds.
+ * Two entries, two jobs -- not a version someone forgot to remove.
+ */
+import ts from "typescript-ast";
 import { readFileSync, globSync } from "node:fs";
 
 /* Where a string literal in this position is shown to somebody. */
diff --git a/scripts/i18n-strings.mjs b/scripts/i18n-strings.mjs
index 0089e7a..310a2ad 100644
--- a/scripts/i18n-strings.mjs
+++ b/scripts/i18n-strings.mjs
@@ -9,7 +9,21 @@
  * exists is dead weight, but a call with no key is an untranslated string
  * nobody noticed.
  */
-import ts from "typescript";
+/*
+ * The parser, not the compiler.
+ *
+ * TypeScript 7 is the native port: its package ships a `tsc` shim over a Go
+ * binary and nothing else, so `typescript` now exports `version` and
+ * `versionMajorMinor` and no compiler API at all. Every `ts.createSourceFile`
+ * in this directory started throwing "Cannot read properties of undefined
+ * (reading 'Latest')" the day the bump landed, and nothing noticed, because no
+ * workflow runs these.
+ *
+ * `typescript-ast` is an npm alias for the last TypeScript that carries the JS
+ * API (see package.json). It parses; `typescript` still type-checks and builds.
+ * Two entries, two jobs -- not a version someone forgot to remove.
+ */
+import ts from "typescript-ast";
 import { readFileSync, globSync } from "node:fs";
 
 const strings = new Set();