diff --git a/packages/modeling/src/maths/mat4/invert.d.ts b/packages/modeling/src/maths/mat4/invert.d.ts
new file mode 100644
index 000000000..76310d659
--- /dev/null
+++ b/packages/modeling/src/maths/mat4/invert.d.ts
@@ -0,0 +1,3 @@
+import type { Mat4 } from './type.d.ts'
+
+export function invert(out: Mat4, matrix: Mat4): Mat4
diff --git a/packages/modeling/src/maths/mat4/invert.js b/packages/modeling/src/maths/mat4/invert.js
index 743642c1d..6e5565603 100644
--- a/packages/modeling/src/maths/mat4/invert.js
+++ b/packages/modeling/src/maths/mat4/invert.js
@@ -5,7 +5,6 @@
  * @author Julian Lloyd
  * code from https://github.com/jlmakes/rematrix/blob/master/src/index.js
  *
- * @typedef {import("./type.d.ts").Mat4} Mat4
  * @param {Mat4} out - receiving matrix
  * @param {Mat4} matrix - matrix to invert
  * @returns {Mat4?} out
diff --git a/packages/modeling/src/maths/mat4/isIdentity.d.ts b/packages/modeling/src/maths/mat4/isIdentity.d.ts
new file mode 100644
index 000000000..ff1515d8a
--- /dev/null
+++ b/packages/modeling/src/maths/mat4/isIdentity.d.ts
@@ -0,0 +1,3 @@
+import type { Mat4 } from './type.d.ts'
+
+export function isIdentity(matrix: Mat4): Mat4
diff --git a/packages/modeling/src/maths/mat4/isIdentity.js b/packages/modeling/src/maths/mat4/isIdentity.js
index 87fc2090e..f81fac28c 100644
--- a/packages/modeling/src/maths/mat4/isIdentity.js
+++ b/packages/modeling/src/maths/mat4/isIdentity.js
@@ -4,7 +4,6 @@
  *
  *     mat4.equals(mat4.create(), matrix)
  *
- * @typedef {import("./type.d.ts").Mat4} Mat4
  * @param {Mat4} matrix - the matrix
  * @returns {boolean} true if matrix is the identity transform
  * @alias module:modeling/maths/mat4.isIdentity
diff --git a/packages/modeling/src/maths/mat4/isOnlyTransformScale.d.ts b/packages/modeling/src/maths/mat4/isOnlyTransformScale.d.ts
new file mode 100644
index 000000000..6fec6a0b1
--- /dev/null
+++ b/packages/modeling/src/maths/mat4/isOnlyTransformScale.d.ts
@@ -0,0 +1,3 @@
+import type { Mat4 } from './type.d.ts'
+
+export function isOnlyTransformScale(matrix: Mat4): boolean
diff --git a/packages/modeling/src/maths/mat4/isOnlyTransformScale.js b/packages/modeling/src/maths/mat4/isOnlyTransformScale.js
index 4d3d82082..7f3007bd6 100644
--- a/packages/modeling/src/maths/mat4/isOnlyTransformScale.js
+++ b/packages/modeling/src/maths/mat4/isOnlyTransformScale.js
@@ -3,7 +3,6 @@
  * Determine whether the given matrix is only translate and/or scale.
  * This code returns true for TAU / 2 rotation as it can be interpreted as scale.
  *
- * @typedef {import("./type.d.ts").Mat4} Mat4
  * @param {Mat4} matrix - the matrix
  * @returns {boolean} true if matrix is for translate and/or scale
  * @alias module:modeling/maths/mat4.isOnlyTransformScale