Add triple-slash types reference to trusted-types.

dist/purify.cjs.d.ts

@@ -1,3 +1,4 @@
+/// <reference types="trusted-types" />
 /*! @license DOMPurify 3.2.1 | (c) Cure53 and other contributors | Released under the Apache license 2.0 and Mozilla Public License 2.0 | github.com/cure53/DOMPurify/blob/3.2.1/LICENSE */
 
 /**

dist/purify.es.d.mts

@@ -1,3 +1,4 @@
+/// <reference types="trusted-types" />
 /*! @license DOMPurify 3.2.1 | (c) Cure53 and other contributors | Released under the Apache license 2.0 and Mozilla Public License 2.0 | github.com/cure53/DOMPurify/blob/3.2.1/LICENSE */
 
 /**

package.json

@@ -7,10 +7,10 @@
     "commit-amend-build": "scripts/commit-amend-build.sh",
     "prebuild": "rimraf dist/**",
     "dev": "cross-env NODE_ENV=development BABEL_ENV=rollup rollup -w -c -o dist/purify.js",
-    "build": "run-s build:types build:rollup build:fix-cjs-types build:cleanup",
+    "build": "run-s build:types build:rollup build:fix-types build:cleanup",
     "build:types": "tsc --outDir dist/types --declaration --emitDeclarationOnly",
     "build:rollup": "rollup -c",
-    "build:fix-cjs-types": "node ./scripts/fix-cjs-types.js",
+    "build:fix-types": "node ./scripts/fix-types.js",
     "build:umd": "rollup -c -f umd -o dist/purify.js",
     "build:umd:min": "rollup -c -f umd -o dist/purify.min.js -p terser",
     "build:es": "rollup -c -f es -o dist/purify.es.mjs",
@@ -103,6 +103,7 @@
     "@rollup/plugin-replace": "^6.0.1",
     "@rollup/plugin-terser": "^0.4.4",
     "@types/estree": "^1.0.0",
+    "@types/node": "^16.18.120",
     "cross-env": "^7.0.3",
     "eslint-config-prettier": "^8.5.0",
     "eslint-plugin-prettier": "^4.0.0",

scripts/fix-types.js

@@ -0,0 +1,58 @@
+// @ts-check
+
+const fs = require('node:fs/promises');
+const path = require('node:path');
+
+(async () => {
+  // Note that this script is intended to run on the type declaration file that is
+  // output by Rollup, and not the type declaration file generated from TypeScript.
+  await fixCjsTypes(path.resolve(__dirname, '../dist/purify.cjs.d.ts'));
+  await fixEsmTypes(path.resolve(__dirname, '../dist/purify.es.d.mts'));
+})().catch((ex) => {
+  console.error(ex);
+  process.exitCode = 1;
+});
+
+/**
+ * Fixes the CommonJS type declarations file.
+ * @param {string} fileName
+ */
+async function fixCjsTypes(fileName) {
+  let types = await fs.readFile(fileName, { encoding: 'utf-8' });
+
+  // DOMPurify is exported as a default export, but rollup changes
+  // it to be assigned to `module.exports`. We need to change the
+  // type declarations to match what rollup changed it to. Remove
+  // the "default" export from the `export { ... }` statement.
+  let fixed = types.replace(', _default as default', '');
+
+  // Verify that we actually removed something in case the
+  // type declarations are different to what we expected.
+  if (fixed === types) {
+    throw new Error('Failed to fix CommonJS type declarations.');
+  }
+
+  // Append `export = _default;` to match the `module.exports = DOMPurify`
+  // statement that Rollup creates. This can cause compilation errors
+  // for certain configurations, so add a `@ts-ignore` comment before it.
+  fixed += '\n// @ts-ignore\nexport = _default;\n';
+
+  await fs.writeFile(fileName, addTrustedTypesReference(fixed));
+}
+
+/**
+ * Fixes the ESM type declarations file.
+ * @param {string} fileName
+ */
+async function fixEsmTypes(fileName) {
+  let types = await fs.readFile(fileName, { encoding: 'utf-8' });
+  await fs.writeFile(fileName, addTrustedTypesReference(types));
+}
+
+function addTrustedTypesReference(types) {
+  // We need to tell TypeScript that we use the type declarations from
+  // `trusted-types` so that it ends up in our type declaration type).
+  // Without this, the references to trusted-types in the type declaration
+  // file can cause compilation errors for certain configurations.
+  return `/// <reference types="trusted-types" />\n${types}`;
+}