diff --git a/lib/types.d.ts b/lib/types.d.ts
index 9920ce7b..7b1d471d 100644
--- a/lib/types.d.ts
+++ b/lib/types.d.ts
@@ -1,3 +1,5 @@
+declare module "sharp" {
+
 /**
  * @class Sharp
  *
@@ -202,7 +204,7 @@ declare function clone(): Sharp;
  * @param {Function} [callback] - called with the arguments `(err, metadata)`
  * @returns {Promise<Object>|Sharp}
  */
-declare function metadata(callback?: (() => any)): (Promise.<Object>|Sharp);
+declare function metadata(callback?: (() => any)): (Promise<Object>|Sharp);
 
 /**
  * Do not process input images where the number of pixels (width * height) exceeds this limit.
@@ -792,7 +794,7 @@ declare function bandbool(boolOp: String): Sharp;
  * @returns {Promise<Object>} - when no callback is provided
  * @throws {Error} Invalid parameters
  */
-declare function toFile(fileOut: String, callback?: (() => any)): Promise.<Object>;
+declare function toFile(fileOut: String, callback?: (() => any)): Promise<Object>;
 
 /**
  * Write output to a Buffer.
@@ -806,7 +808,7 @@ declare function toFile(fileOut: String, callback?: (() => any)): Promise.<Objec
  * @param {Function} [callback]
  * @returns {Promise<Buffer>} - when no callback is provided
  */
-declare function toBuffer(callback?: (() => any)): Promise.<Buffer>;
+declare function toBuffer(callback?: (() => any)): Promise<Buffer>;
 
 /**
  * Include all metadata (EXIF, XMP, IPTC) from the input image in the output image.
@@ -1017,3 +1019,5 @@ declare function counters(): Object;
  */
 declare function simd(simd?: Boolean): Boolean;
 
+}
+
diff --git a/package.json b/package.json
index cf9b943e..6497ca5b 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
     "test-leak": "./test/leak/leak.sh",
     "test-packaging": "./packaging/test-linux-x64.sh",
     "docs": "for m in constructor input resize composite operation colour channel output utility; do documentation build --shallow --format=md lib/$m.js >docs/api-$m.md; done",
-    "types": "cd lib && jsdoc -d . -t ../node_modules/tsd-jsdoc constructor.js input.js resize.js composite.js operation.js colour.js channel.js output.js utility.js"
+    "types": "./packaging/types.sh"
   },
   "main": "lib/index.js",
   "types": "lib/types.d.ts",
@@ -81,7 +81,7 @@
     "nyc": "^9.0.1",
     "rimraf": "^2.5.4",
     "semistandard": "^9.1.0",
-    "tsd-jsdoc": "^1.0.1",
+    "tsd-jsdoc": "lovell/tsd-jsdoc#add-support-for-promises",
     "unzip": "^0.1.11"
   },
   "license": "Apache-2.0",
diff --git a/packaging/types.sh b/packaging/types.sh
new file mode 100755
index 00000000..1751256e
--- /dev/null
+++ b/packaging/types.sh
@@ -0,0 +1,14 @@
+#!/bin/sh
+
+# Regenerates lib/types.d.ts Typescript definitions
+sources="lib/constructor.js lib/input.js lib/resize.js lib/composite.js lib/operation.js lib/colour.js lib/channel.js lib/output.js lib/utility.js"
+types="types.d.ts"
+
+# Generate types via JSDoc comments
+./node_modules/.bin/jsdoc -d . -t ./node_modules/tsd-jsdoc $sources
+
+# Wrap output with module declaration
+echo "declare module \"sharp\" {\n" > "lib/$types"
+cat "$types" >> "lib/$types"
+echo "}\n" >> "lib/$types"
+rm "$types"