From 00fc7505cc2e36ce86592ab60527b44c103387b9 Mon Sep 17 00:00:00 2001
From: Colin Rotherham <work@colinr.com>
Date: Mon, 2 Oct 2023 13:49:44 +0100
Subject: [PATCH] Publish type declarations

---
 packages/govuk-frontend-review/package.json               | 2 +-
 packages/govuk-frontend/package.json                      | 4 +++-
 packages/govuk-frontend/tasks/build/package.unit.test.mjs | 3 ++-
 packages/govuk-frontend/tsconfig.build.json               | 5 +++++
 4 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/packages/govuk-frontend-review/package.json b/packages/govuk-frontend-review/package.json
index 7120a0b71f..faf0651f8c 100644
--- a/packages/govuk-frontend-review/package.json
+++ b/packages/govuk-frontend-review/package.json
@@ -15,7 +15,7 @@
     "build:sassdoc": "sassdoc --config sassdoc.config.yaml ../govuk-frontend/src/govuk",
     "build:types": "tsc --build tsconfig.build.json",
     "build:jsdoc": "typedoc",
-    "postbuild": "npm run build:jsdoc && npm run build:sassdoc",
+    "postbuild": "npm run build:jsdoc && npm run build:sassdoc && npm run build:types",
     "clean": "del-cli dist",
     "proxy": "browser-sync start --config browsersync.config.js",
     "serve": "nodemon",
diff --git a/packages/govuk-frontend/package.json b/packages/govuk-frontend/package.json
index 0fd94afdd5..d97890184c 100644
--- a/packages/govuk-frontend/package.json
+++ b/packages/govuk-frontend/package.json
@@ -4,6 +4,7 @@
   "version": "5.0.0",
   "main": "dist/govuk/all.bundle.js",
   "module": "dist/govuk/all.mjs",
+  "types": "dist/govuk/all.d.mts",
   "sass": "dist/govuk/all.scss",
   "files": [
     "dist",
@@ -13,6 +14,7 @@
   ],
   "exports": {
     ".": {
+      "types": "./dist/govuk/all.d.mts",
       "sass": "./dist/govuk/all.scss",
       "import": "./dist/govuk/all.mjs",
       "require": "./dist/govuk/all.bundle.js",
@@ -57,7 +59,7 @@
     "clean": "npm run clean:package",
     "clean:package": "del-cli *.tsbuildinfo dist govuk-prototype-kit.config.json",
     "clean:release": "del-cli ../../dist --force",
-    "postbuild:package": "npm run build:stats && govuk-prototype-kit validate-plugin .",
+    "postbuild:package": "npm run build:stats && npm run build:types && govuk-prototype-kit validate-plugin .",
     "version": "echo $npm_package_version"
   },
   "devDependencies": {
diff --git a/packages/govuk-frontend/tasks/build/package.unit.test.mjs b/packages/govuk-frontend/tasks/build/package.unit.test.mjs
index 8530118a14..f081cc25a1 100644
--- a/packages/govuk-frontend/tasks/build/package.unit.test.mjs
+++ b/packages/govuk-frontend/tasks/build/package.unit.test.mjs
@@ -74,7 +74,8 @@ describe('packages/govuk-frontend/dist/', () => {
       .flatMap(
         mapPathTo(['**/*.mjs'], ({ dir: requirePath, name }) => [
           join(requirePath, `${name}.mjs`),
-          join(requirePath, `${name}.mjs.map`) // with source map
+          join(requirePath, `${name}.mjs.map`), // with source map
+          join(requirePath, `${name}.d.mts`) // with type declaration
         ])
       )
 
diff --git a/packages/govuk-frontend/tsconfig.build.json b/packages/govuk-frontend/tsconfig.build.json
index 7d16b65566..e599c09192 100644
--- a/packages/govuk-frontend/tsconfig.build.json
+++ b/packages/govuk-frontend/tsconfig.build.json
@@ -3,7 +3,12 @@
   "include": ["./src/govuk/**/*.mjs"],
   "exclude": ["**/*.test.*"],
   "compilerOptions": {
+    "declaration": true,
+    "emitDeclarationOnly": true,
     "lib": ["ESNext", "DOM"],
+    "noEmit": false,
+    "outDir": "./dist",
+    "rootDir": "./src",
     "strict": true,
     "target": "ES2015",
     "types": ["node", "typed-query-selector"]