diff --git a/.github/actions/install/action.yml b/.github/actions/install/action.yml
new file mode 100644
index 000000000..bf8bc447c
--- /dev/null
+++ b/.github/actions/install/action.yml
@@ -0,0 +1,18 @@
+name: install
+description: >
+  Installs Meteor and NPM dependencies.
+
+runs:
+
+  using: composite
+
+  steps:
+
+    - name: Install 💾
+      id: install
+      uses: meteor-actions/install@v6
+
+    - name: Postinstall 🪝
+      if: steps.install.outputs.ran-npm-install-hooks != 'true'
+      shell: bash
+      run: meteor npm run postinstall
diff --git a/.github/workflows/ci:build.yml b/.github/workflows/ci:build.yml
index c818ababc..09b984da2 100644
--- a/.github/workflows/ci:build.yml
+++ b/.github/workflows/ci:build.yml
@@ -34,7 +34,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install 💾
-        uses: meteor-actions/install@v6
+        uses: ./.github/actions/install
 
       - name: Get Meteor's Node version
         id: meteor-node
diff --git a/.github/workflows/ci:commit-msg.yml b/.github/workflows/ci:commit-msg.yml
index a715a858e..9b103a2d3 100644
--- a/.github/workflows/ci:commit-msg.yml
+++ b/.github/workflows/ci:commit-msg.yml
@@ -24,7 +24,7 @@ jobs:
           fetch-depth: 0
 
       - name: Install 💾
-        uses: meteor-actions/install@v6
+        uses: ./.github/actions/install
 
       - name: Lint last pushed commit 👕
         if: github.event_name == 'push'
diff --git a/.github/workflows/ci:lint-config.yml b/.github/workflows/ci:lint-config.yml
index bbb329847..eed556ed6 100644
--- a/.github/workflows/ci:lint-config.yml
+++ b/.github/workflows/ci:lint-config.yml
@@ -22,7 +22,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install 💾
-        uses: meteor-actions/install@v6
+        uses: ./.github/actions/install
 
       - name: Lint config 👕
         run: meteor npm run lint-config
diff --git a/.github/workflows/ci:lint.yml b/.github/workflows/ci:lint.yml
index a528689b8..dd3542490 100644
--- a/.github/workflows/ci:lint.yml
+++ b/.github/workflows/ci:lint.yml
@@ -22,7 +22,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install 💾
-        uses: meteor-actions/install@v6
+        uses: ./.github/actions/install
 
       - name: Lint 👕
         run: meteor npm run lint
diff --git a/.github/workflows/ci:test.yml b/.github/workflows/ci:test.yml
index 1e106c326..c00d7103c 100644
--- a/.github/workflows/ci:test.yml
+++ b/.github/workflows/ci:test.yml
@@ -31,7 +31,7 @@ jobs:
           key: ${{ runner.os }}-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
 
       - name: Install 💾
-        uses: meteor-actions/install@v6
+        uses: ./.github/actions/install
 
       - name: Cache build 💽
         uses: meteor-actions/cache-build@v4
@@ -92,7 +92,7 @@ jobs:
           key: ${{ runner.os }}-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
 
       - name: Install 💾
-        uses: meteor-actions/install@v6
+        uses: ./.github/actions/install
 
       - name: Cache build 💽
         uses: meteor-actions/cache-build@v4
diff --git a/.github/workflows/ci:type-check.yml b/.github/workflows/ci:type-check.yml
index f3d5394a8..1cb9d96cb 100644
--- a/.github/workflows/ci:type-check.yml
+++ b/.github/workflows/ci:type-check.yml
@@ -22,7 +22,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install 💾
-        uses: meteor-actions/install@v6
+        uses: ./.github/actions/install
 
       - name: TypeScript check ☑️
         run: meteor npm run tsc
diff --git a/client/main.tsx b/client/main.tsx
index 0637fe632..1fc35d229 100644
--- a/client/main.tsx
+++ b/client/main.tsx
@@ -1,5 +1,6 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
+// eslint-disable-next-line import/order, import/no-unassigned-import
+import './polyfill';
+
 import React, {StrictMode} from 'react';
 
 import {Meteor} from 'meteor/meteor';
diff --git a/client/polyfill.ts b/client/polyfill.ts
new file mode 100644
index 000000000..1a15fb5c6
--- /dev/null
+++ b/client/polyfill.ts
@@ -0,0 +1,2 @@
+// eslint-disable-next-line import/no-unassigned-import
+import 'regenerator-runtime/runtime.js';
diff --git a/codecov.yml b/codecov.yml
index d07ddeb3d..0b10e1d15 100644
--- a/codecov.yml
+++ b/codecov.yml
@@ -2,7 +2,7 @@ coverage:
   status:
     project:
       default:
-        target: 66%
+        target: 67%
         threshold: 2%
     patch:
       default:
diff --git a/imports/_test/fixtures.ts b/imports/_test/fixtures.ts
index a83510e82..f65648c23 100644
--- a/imports/_test/fixtures.ts
+++ b/imports/_test/fixtures.ts
@@ -88,6 +88,8 @@ export const client = (title, fn) => {
 		let original;
 
 		const prepare = async () => {
+			await import('../../client/polyfill');
+
 			original = await forgetHistory();
 			await cleanup();
 		};
@@ -113,6 +115,8 @@ export const server = (title, fn) => {
 		};
 
 		const prepare = async () => {
+			await import('../../server/polyfill');
+
 			if (isAppTest()) {
 				await appIsReady();
 			}
@@ -132,6 +136,11 @@ export const server = (title, fn) => {
 	}
 };
 
+export const isomorphic = (title, fn) => {
+	client(title, fn);
+	server(title, fn);
+};
+
 export const throws = async (
 	fn: () => Promise<any>,
 	expected: string | RegExp,
diff --git a/imports/_test/image.ts b/imports/_test/image.ts
new file mode 100644
index 000000000..3a8ce1518
--- /dev/null
+++ b/imports/_test/image.ts
@@ -0,0 +1,164 @@
+import {assert} from 'chai';
+
+import {type Sharp} from 'sharp';
+
+import {createContextIso, destroyContextIso} from '../lib/canvas';
+import blobToImage from '../lib/blob/blobToImage';
+
+type TypedArray =
+	| Uint8Array
+	| Uint8ClampedArray
+	| Int8Array
+	| Uint16Array
+	| Int16Array
+	| Uint32Array
+	| Int32Array
+	| Float32Array
+	| Float64Array;
+type SharpInput = ArrayBuffer | TypedArray;
+type S = Sharp | SharpInput;
+
+type I = HTMLImageElement | ArrayBuffer;
+
+type Image = S | I;
+
+const _s = async (x: S): Promise<Sharp> => {
+	const {default: sharp} = await import('sharp');
+	return x instanceof sharp ? (x as Sharp) : sharp(x as SharpInput);
+};
+
+const _i = async (x: I): Promise<HTMLImageElement> => {
+	if (x instanceof HTMLImageElement) return x;
+	const blob = new Blob([x], {type: 'image/png'});
+	const image = await blobToImage(blob);
+	return image;
+};
+
+const _pixels = async (image: HTMLImageElement): Promise<Uint8ClampedArray> => {
+	const {width, height} = image;
+	const context = await createContextIso({width, height});
+	context.drawImage(image, 0, 0);
+	const data = context.getImageData(0, 0, width, height).data;
+	destroyContextIso(context);
+	return data;
+};
+
+const _xorClient = (
+	a: Uint8ClampedArray,
+	b: Uint8ClampedArray,
+): Uint8ClampedArray => {
+	const n = a.length;
+	assert.equal(b.length, n);
+	const delta = new Uint8ClampedArray(n);
+	for (let i = 0; i < n; ++i) {
+		// eslint-disable-next-line no-bitwise
+		delta[i] = a[i]! ^ b[i]!;
+	}
+
+	return delta;
+};
+
+const _diffClient = async (a: Image, b: Image) => {
+	const _a = await _i(a as I);
+	const _b = await _i(b as I);
+	const aPixels = await _pixels(_a);
+	const bPixels = await _pixels(_b);
+	return _xorClient(aPixels, bPixels);
+};
+
+const _diffServer = async (a: Image, b: Image) => {
+	const _a = await _s(a as S);
+	const _b = await _s(b as S);
+	const delta = await _xorServer(_a, _b);
+	return delta.raw().toBuffer();
+};
+
+export const diff = Meteor.isServer ? _diffServer : _diffClient;
+
+export const assertEqual = async (a: Image, b: Image) => {
+	const delta = await diff(a, b);
+	assert(
+		!delta.some((value, index) => index % 4 !== 3 && value !== 0),
+		`Input images are not equal.`,
+	);
+};
+
+const _assertSameDimensions = async (a: Sharp, b: Sharp): Promise<void> => {
+	const {
+		width: aWidth,
+		height: aHeight,
+		channels: aChannels,
+		hasAlpha: aHasAlpha,
+	} = await a.metadata();
+	const {
+		width: bWidth,
+		height: bHeight,
+		channels: bChannels,
+		hasAlpha: bHasAlpha,
+	} = await b.metadata();
+
+	assert.equal(
+		aWidth,
+		bWidth,
+		`Images have different widths: ${aWidth} !== ${bWidth}`,
+	);
+
+	assert.equal(
+		aHeight,
+		bHeight,
+		`Images have different heights: ${aHeight} !== ${bHeight}`,
+	);
+
+	assert.equal(
+		aChannels,
+		bChannels,
+		`Images have different number of channels: ${aChannels} !== ${bChannels}`,
+	);
+
+	assert.equal(
+		aHasAlpha,
+		bHasAlpha,
+		`Images have different alpha channel settings: ${aHasAlpha} !== ${bHasAlpha}`,
+	);
+};
+
+const _xorServer = async (a: Sharp, b: Sharp): Promise<Sharp> => {
+	await _assertSameDimensions(a, b);
+	const _b = await b.toBuffer();
+	return a.boolean(_b, 'eor');
+};
+
+const _whiteRectanglePNGServer = async (options: {
+	width: number;
+	height: number;
+}) => {
+	const {default: sharp} = await import('sharp');
+	return sharp({
+		create: {
+			...options,
+			channels: 4,
+			background: {r: 255, g: 255, b: 255, alpha: 0},
+		},
+	}).png();
+};
+
+const _whiteRectanglePNGClient = async ({
+	width,
+	height,
+}: {
+	width: number;
+	height: number;
+}): Promise<HTMLImageElement> => {
+	const context = await createContextIso({width, height});
+	context.fillStyle = '#FFFFFF';
+	context.fillRect(0, 0, width, height);
+	const url = context.canvas.toDataURL('image/png');
+	destroyContextIso(context);
+	const img = new Image();
+	img.src = url;
+	return img;
+};
+
+export const whiteRectanglePNG = Meteor.isServer
+	? _whiteRectanglePNGServer
+	: _whiteRectanglePNGClient;
diff --git a/imports/_test/pdf.ts b/imports/_test/pdf.ts
new file mode 100644
index 000000000..c7412f3a7
--- /dev/null
+++ b/imports/_test/pdf.ts
@@ -0,0 +1,31 @@
+import blobToDataURL from '../lib/blob/blobToDataURL';
+
+const document = `%PDF-1.0
+1 0 obj<</Type/Catalog/Pages 2 0 R>>endobj
+2 0 obj<</Type/Pages/Kids[3 0 R]/Count 1>>endobj
+3 0 obj<</Type/Page/MediaBox[0 0 3 3]>>endobj
+xref
+0 4
+0000000000 65535 f
+0000000009 00000 n
+0000000052 00000 n
+0000000101 00000 n
+trailer<</Size 4/Root 1 0 R>>
+startxref
+147
+%EOF
+`;
+
+export const randomPDFUint8Array = (): Uint8Array => {
+	return new TextEncoder().encode(document);
+};
+
+export const randomPDFBlob = (): Blob => {
+	const data = randomPDFUint8Array();
+	return new Blob([data.buffer], {type: 'application/pdf'});
+};
+
+export const randomPDFDataURI = async (): Promise<string> => {
+	const blob = randomPDFBlob();
+	return blobToDataURL(blob);
+};
diff --git a/imports/_test/png.ts b/imports/_test/png.ts
index 3d1bca70e..4501c40d2 100644
--- a/imports/_test/png.ts
+++ b/imports/_test/png.ts
@@ -1,3 +1,5 @@
+import pngDataURL from '../lib/png/dataURL';
+
 const base64Encoded =
 	'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=';
 
@@ -6,8 +8,7 @@ export const randomPNGBuffer = async () => {
 	return Buffer.from(base64Encoded, 'base64');
 };
 
-export const randomPNGDataURI = (): string =>
-	`data:image/png;base64,${base64Encoded}`;
+export const randomPNGDataURI = (): string => pngDataURL(base64Encoded);
 
 export const randomPNGResponse = async (): Promise<Response> =>
 	fetch(randomPNGDataURI());
diff --git a/imports/api/endpoint/allergies/changeColor.tests.ts b/imports/api/endpoint/allergies/changeColor.tests.ts
index a523e03f8..d433f01a9 100644
--- a/imports/api/endpoint/allergies/changeColor.tests.ts
+++ b/imports/api/endpoint/allergies/changeColor.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {Allergies} from '../../collection/allergies';
diff --git a/imports/api/endpoint/appointments/beginConsultation.tests.ts b/imports/api/endpoint/appointments/beginConsultation.tests.ts
index e466a7583..5a1f1401f 100644
--- a/imports/api/endpoint/appointments/beginConsultation.tests.ts
+++ b/imports/api/endpoint/appointments/beginConsultation.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {
diff --git a/imports/api/endpoint/appointments/cancel.tests.ts b/imports/api/endpoint/appointments/cancel.tests.ts
index 89cb0a656..75b3e648c 100644
--- a/imports/api/endpoint/appointments/cancel.tests.ts
+++ b/imports/api/endpoint/appointments/cancel.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {
diff --git a/imports/api/endpoint/appointments/remove.tests.ts b/imports/api/endpoint/appointments/remove.tests.ts
index faf6d3838..766dd61f4 100644
--- a/imports/api/endpoint/appointments/remove.tests.ts
+++ b/imports/api/endpoint/appointments/remove.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {
diff --git a/imports/api/endpoint/appointments/reschedule.tests.ts b/imports/api/endpoint/appointments/reschedule.tests.ts
index d514e1fc3..e573127a2 100644
--- a/imports/api/endpoint/appointments/reschedule.tests.ts
+++ b/imports/api/endpoint/appointments/reschedule.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {Appointments} from '../../collection/appointments';
diff --git a/imports/api/endpoint/appointments/schedule.tests.ts b/imports/api/endpoint/appointments/schedule.tests.ts
index f6cd04a1e..48ae9c27f 100644
--- a/imports/api/endpoint/appointments/schedule.tests.ts
+++ b/imports/api/endpoint/appointments/schedule.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {
diff --git a/imports/api/endpoint/appointments/uncancel.tests.ts b/imports/api/endpoint/appointments/uncancel.tests.ts
index 0f0005644..20de2d87a 100644
--- a/imports/api/endpoint/appointments/uncancel.tests.ts
+++ b/imports/api/endpoint/appointments/uncancel.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {
diff --git a/imports/api/endpoint/availability/next.tests.ts b/imports/api/endpoint/availability/next.tests.ts
index 0d1bfa4d7..b6a93eb5e 100644
--- a/imports/api/endpoint/availability/next.tests.ts
+++ b/imports/api/endpoint/availability/next.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import addMinutes from 'date-fns/addMinutes';
diff --git a/imports/api/endpoint/books/csv.tests.ts b/imports/api/endpoint/books/csv.tests.ts
index 53965ae72..5aed8161f 100644
--- a/imports/api/endpoint/books/csv.tests.ts
+++ b/imports/api/endpoint/books/csv.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import startOfYear from 'date-fns/startOfYear';
diff --git a/imports/api/endpoint/books/rename.tests.ts b/imports/api/endpoint/books/rename.tests.ts
index 7ef652f7f..1f6039ca8 100644
--- a/imports/api/endpoint/books/rename.tests.ts
+++ b/imports/api/endpoint/books/rename.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import invoke from '../invoke';
diff --git a/imports/api/endpoint/consultations/attach.tests.ts b/imports/api/endpoint/consultations/attach.tests.ts
index d7977a3f3..f71caaf80 100644
--- a/imports/api/endpoint/consultations/attach.tests.ts
+++ b/imports/api/endpoint/consultations/attach.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/consultations/detach.tests.ts b/imports/api/endpoint/consultations/detach.tests.ts
index 967502ace..05cc4d5d0 100644
--- a/imports/api/endpoint/consultations/detach.tests.ts
+++ b/imports/api/endpoint/consultations/detach.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/consultations/insert.tests.ts b/imports/api/endpoint/consultations/insert.tests.ts
index 353d4f491..fedbba506 100644
--- a/imports/api/endpoint/consultations/insert.tests.ts
+++ b/imports/api/endpoint/consultations/insert.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/consultations/remove.tests.ts b/imports/api/endpoint/consultations/remove.tests.ts
index 249da1c78..a4dbcf2e5 100644
--- a/imports/api/endpoint/consultations/remove.tests.ts
+++ b/imports/api/endpoint/consultations/remove.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {Patients} from '../../collection/patients';
diff --git a/imports/api/endpoint/consultations/restoreAppointment.tests.ts b/imports/api/endpoint/consultations/restoreAppointment.tests.ts
index d1609c53d..8dfca3e02 100644
--- a/imports/api/endpoint/consultations/restoreAppointment.tests.ts
+++ b/imports/api/endpoint/consultations/restoreAppointment.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {dropIds, randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/consultations/transfer.tests.ts b/imports/api/endpoint/consultations/transfer.tests.ts
index d7eb113be..d3068b1c5 100644
--- a/imports/api/endpoint/consultations/transfer.tests.ts
+++ b/imports/api/endpoint/consultations/transfer.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/consultations/update.tests.ts b/imports/api/endpoint/consultations/update.tests.ts
index 04e8f41c4..512063474 100644
--- a/imports/api/endpoint/consultations/update.tests.ts
+++ b/imports/api/endpoint/consultations/update.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/documents/delete.tests.ts b/imports/api/endpoint/documents/delete.tests.ts
index 5b235199b..a9d3de388 100644
--- a/imports/api/endpoint/documents/delete.tests.ts
+++ b/imports/api/endpoint/documents/delete.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/documents/fetch.tests.ts b/imports/api/endpoint/documents/fetch.tests.ts
index 14e4d1496..b0ed12757 100644
--- a/imports/api/endpoint/documents/fetch.tests.ts
+++ b/imports/api/endpoint/documents/fetch.tests.ts
@@ -1,7 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
-// eslint-disable-next-line import/no-unassigned-import
-import 'core-js/features/string/replace-all';
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/documents/insert.tests.ts b/imports/api/endpoint/documents/insert.tests.ts
index a054b1463..3a08e14cd 100644
--- a/imports/api/endpoint/documents/insert.tests.ts
+++ b/imports/api/endpoint/documents/insert.tests.ts
@@ -1,7 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
-// eslint-disable-next-line import/no-unassigned-import
-import 'core-js/features/string/replace-all';
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/documents/link.tests.ts b/imports/api/endpoint/documents/link.tests.ts
index 6617544df..227a867df 100644
--- a/imports/api/endpoint/documents/link.tests.ts
+++ b/imports/api/endpoint/documents/link.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/documents/restore.tests.ts b/imports/api/endpoint/documents/restore.tests.ts
index 0893002ed..4f8ad1366 100644
--- a/imports/api/endpoint/documents/restore.tests.ts
+++ b/imports/api/endpoint/documents/restore.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/documents/superdelete.tests.ts b/imports/api/endpoint/documents/superdelete.tests.ts
index 48398ed67..233810dc8 100644
--- a/imports/api/endpoint/documents/superdelete.tests.ts
+++ b/imports/api/endpoint/documents/superdelete.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/documents/unlink.tests.ts b/imports/api/endpoint/documents/unlink.tests.ts
index b52b3383b..a0f4272bf 100644
--- a/imports/api/endpoint/documents/unlink.tests.ts
+++ b/imports/api/endpoint/documents/unlink.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/patients/attach.tests.ts b/imports/api/endpoint/patients/attach.tests.ts
index d83592a1b..1e8b02a67 100644
--- a/imports/api/endpoint/patients/attach.tests.ts
+++ b/imports/api/endpoint/patients/attach.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/patients/detach.tests.ts b/imports/api/endpoint/patients/detach.tests.ts
index 81dde15bc..15a622639 100644
--- a/imports/api/endpoint/patients/detach.tests.ts
+++ b/imports/api/endpoint/patients/detach.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/patients/insert.tests.ts b/imports/api/endpoint/patients/insert.tests.ts
index 0faf8d4f8..4ed3a2919 100644
--- a/imports/api/endpoint/patients/insert.tests.ts
+++ b/imports/api/endpoint/patients/insert.tests.ts
@@ -1,6 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
-
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/patients/merge.tests.ts b/imports/api/endpoint/patients/merge.tests.ts
index 0d59a5d9d..3bee36570 100644
--- a/imports/api/endpoint/patients/merge.tests.ts
+++ b/imports/api/endpoint/patients/merge.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {randomUserId, server, setLike} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/patients/remove.tests.ts b/imports/api/endpoint/patients/remove.tests.ts
index afd7a312f..19a66897e 100644
--- a/imports/api/endpoint/patients/remove.tests.ts
+++ b/imports/api/endpoint/patients/remove.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/patients/update.tests.ts b/imports/api/endpoint/patients/update.tests.ts
index 6f86474b6..cc7d12897 100644
--- a/imports/api/endpoint/patients/update.tests.ts
+++ b/imports/api/endpoint/patients/update.tests.ts
@@ -1,6 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
-
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/permissions/token/generate.tests.ts b/imports/api/endpoint/permissions/token/generate.tests.ts
index 957deafe1..3a7e19457 100644
--- a/imports/api/endpoint/permissions/token/generate.tests.ts
+++ b/imports/api/endpoint/permissions/token/generate.tests.ts
@@ -1,6 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
-
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../../_test/fixtures';
diff --git a/imports/api/endpoint/permissions/token/revoke.tests.ts b/imports/api/endpoint/permissions/token/revoke.tests.ts
index 2d3794c23..524c98c81 100644
--- a/imports/api/endpoint/permissions/token/revoke.tests.ts
+++ b/imports/api/endpoint/permissions/token/revoke.tests.ts
@@ -1,6 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
-
 import {randomUserId, server, throws} from '../../../../_test/fixtures';
 import {decode, getPermissionsForToken} from '../../../permissions/token';
 
diff --git a/imports/api/endpoint/settings/reset.tests.ts b/imports/api/endpoint/settings/reset.tests.ts
index ff9ab6124..564fdbfe6 100644
--- a/imports/api/endpoint/settings/reset.tests.ts
+++ b/imports/api/endpoint/settings/reset.tests.ts
@@ -1,6 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
-
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/settings/update.tests.ts b/imports/api/endpoint/settings/update.tests.ts
index 8d38cfd82..3d366d14c 100644
--- a/imports/api/endpoint/settings/update.tests.ts
+++ b/imports/api/endpoint/settings/update.tests.ts
@@ -1,6 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
-
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/uploads/delete.tests.ts b/imports/api/endpoint/uploads/delete.tests.ts
index 9b307c290..031874f8b 100644
--- a/imports/api/endpoint/uploads/delete.tests.ts
+++ b/imports/api/endpoint/uploads/delete.tests.ts
@@ -1,6 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
-
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/uploads/rename.tests.ts b/imports/api/endpoint/uploads/rename.tests.ts
index e0cb42c6f..a25b43fac 100644
--- a/imports/api/endpoint/uploads/rename.tests.ts
+++ b/imports/api/endpoint/uploads/rename.tests.ts
@@ -1,6 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
-
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/endpoint/uploads/restore.tests.ts b/imports/api/endpoint/uploads/restore.tests.ts
index 7f71e58a0..c273c42ee 100644
--- a/imports/api/endpoint/uploads/restore.tests.ts
+++ b/imports/api/endpoint/uploads/restore.tests.ts
@@ -1,6 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
-
 import {assert} from 'chai';
 
 import {randomUserId, server, throws} from '../../../_test/fixtures';
diff --git a/imports/api/transaction/TransactionDriver.tests.ts b/imports/api/transaction/TransactionDriver.tests.ts
index 040bd9ca8..0cc91a402 100644
--- a/imports/api/transaction/TransactionDriver.tests.ts
+++ b/imports/api/transaction/TransactionDriver.tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 
 import {dropId, dropIds, randomId, server} from '../../_test/fixtures';
diff --git a/imports/app/isAppTest.app-tests.ts b/imports/app/isAppTest.app-tests.ts
index 864c23c69..94e919a0c 100644
--- a/imports/app/isAppTest.app-tests.ts
+++ b/imports/app/isAppTest.app-tests.ts
@@ -1,6 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
-
 import {assert} from 'chai';
 
 import {client, server} from '../_test/fixtures';
diff --git a/imports/app/isAppTest.tests.ts b/imports/app/isAppTest.tests.ts
index 68d5f0a8e..14ae6f278 100644
--- a/imports/app/isAppTest.tests.ts
+++ b/imports/app/isAppTest.tests.ts
@@ -1,6 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
-
 import {assert} from 'chai';
 
 import {client, server} from '../_test/fixtures';
diff --git a/imports/app/isNonAppTest.app-tests.ts b/imports/app/isNonAppTest.app-tests.ts
index ac664f2a9..c1ef7a805 100644
--- a/imports/app/isNonAppTest.app-tests.ts
+++ b/imports/app/isNonAppTest.app-tests.ts
@@ -1,6 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
-
 import {assert} from 'chai';
 
 import {client, server} from '../_test/fixtures';
diff --git a/imports/app/isNonAppTest.tests.ts b/imports/app/isNonAppTest.tests.ts
index 1da236d33..09ccce351 100644
--- a/imports/app/isNonAppTest.tests.ts
+++ b/imports/app/isNonAppTest.tests.ts
@@ -1,6 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
-
 import {assert} from 'chai';
 
 import {client, server} from '../_test/fixtures';
diff --git a/imports/app/isProduction.app-tests.ts b/imports/app/isProduction.app-tests.ts
index e4bba1e4f..0fb8b19c1 100644
--- a/imports/app/isProduction.app-tests.ts
+++ b/imports/app/isProduction.app-tests.ts
@@ -1,6 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
-
 import {assert} from 'chai';
 
 import {client, server} from '../_test/fixtures';
diff --git a/imports/app/isProduction.tests.ts b/imports/app/isProduction.tests.ts
index e4bba1e4f..0fb8b19c1 100644
--- a/imports/app/isProduction.tests.ts
+++ b/imports/app/isProduction.tests.ts
@@ -1,6 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
-
 import {assert} from 'chai';
 
 import {client, server} from '../_test/fixtures';
diff --git a/imports/app/isTest.app-tests.ts b/imports/app/isTest.app-tests.ts
index c083323ba..f054b4532 100644
--- a/imports/app/isTest.app-tests.ts
+++ b/imports/app/isTest.app-tests.ts
@@ -1,6 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
-
 import {assert} from 'chai';
 
 import {client, server} from '../_test/fixtures';
diff --git a/imports/app/isTest.tests.ts b/imports/app/isTest.tests.ts
index c083323ba..f054b4532 100644
--- a/imports/app/isTest.tests.ts
+++ b/imports/app/isTest.tests.ts
@@ -1,6 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
-
 import {assert} from 'chai';
 
 import {client, server} from '../_test/fixtures';
diff --git a/imports/lib/blob/blobFromDataURL.ts b/imports/lib/blob/blobFromDataURL.ts
new file mode 100644
index 000000000..1ab1e4a23
--- /dev/null
+++ b/imports/lib/blob/blobFromDataURL.ts
@@ -0,0 +1,6 @@
+const blobFromDataURL = async (url: string): Promise<Blob> => {
+	const response = await fetch(url);
+	return response.blob();
+};
+
+export default blobFromDataURL;
diff --git a/imports/lib/blob/blobToDataURL.ts b/imports/lib/blob/blobToDataURL.ts
new file mode 100644
index 000000000..b6cbcaecf
--- /dev/null
+++ b/imports/lib/blob/blobToDataURL.ts
@@ -0,0 +1,39 @@
+const _blobToDataURLClient = async (blob: Blob): Promise<string> =>
+	new Promise<string>((resolve, reject) => {
+		const reader = new FileReader();
+		reader.addEventListener('load', (_e) => {
+			resolve(reader.result as string);
+		});
+
+		reader.addEventListener('error', (_e) => {
+			reject(reader.error);
+		});
+
+		reader.addEventListener('abort', (_e) => {
+			reject(new Error('Read aborted'));
+		});
+		reader.readAsDataURL(blob);
+	});
+
+const _blobToDataURLServer = async (blob: Blob): Promise<string> => {
+	const mimeType = blob.type;
+	if (mimeType === '') {
+		throw new Error('unknown mime-type');
+	}
+
+	const arrayBuffer = await blob.arrayBuffer();
+
+	const {Buffer} = await import('buffer');
+	const buffer = Buffer.from(arrayBuffer);
+
+	const base64 = buffer.toString('base64');
+
+	const {default: dataURL} = await import('../dataURL');
+	return dataURL(mimeType, base64);
+};
+
+const blobToDataURL = Meteor.isServer
+	? _blobToDataURLServer
+	: _blobToDataURLClient;
+
+export default blobToDataURL;
diff --git a/imports/lib/blob/blobToImage.ts b/imports/lib/blob/blobToImage.ts
new file mode 100644
index 000000000..fec3c0e65
--- /dev/null
+++ b/imports/lib/blob/blobToImage.ts
@@ -0,0 +1,22 @@
+const blobToImage = async (blob: Blob): Promise<HTMLImageElement> =>
+	new Promise((resolve, reject) => {
+		const url = URL.createObjectURL(blob);
+		const img = new Image();
+		img.addEventListener('load', () => {
+			URL.revokeObjectURL(url);
+			resolve(img);
+		});
+
+		img.addEventListener('error', (error) => {
+			URL.revokeObjectURL(url);
+			reject(error);
+		});
+
+		img.addEventListener('abort', (_e) => {
+			reject(new Error(`Image load aborted for ${url}`));
+		});
+
+		img.src = url;
+	});
+
+export default blobToImage;
diff --git a/imports/lib/blob/dataURL.tests.ts b/imports/lib/blob/dataURL.tests.ts
new file mode 100644
index 000000000..700ce08d4
--- /dev/null
+++ b/imports/lib/blob/dataURL.tests.ts
@@ -0,0 +1,19 @@
+import {assert} from 'chai';
+
+import {isomorphic} from '../../_test/fixtures';
+import {randomPNGDataURI} from '../../_test/png';
+
+import blobFromDataURL from './blobFromDataURL';
+import blobToDataURL from './blobToDataURL';
+
+isomorphic(__filename, () => {
+	it('should allow to convert back and forth from a dataURL', async () => {
+		const url = randomPNGDataURI();
+
+		const blob = await blobFromDataURL(url);
+		assert.instanceOf(blob, Blob);
+
+		const result = await blobToDataURL(blob);
+		assert.equal(result, url);
+	});
+});
diff --git a/imports/lib/canvas.ts b/imports/lib/canvas.ts
new file mode 100644
index 000000000..40e4fc06b
--- /dev/null
+++ b/imports/lib/canvas.ts
@@ -0,0 +1,50 @@
+import {type Canvas} from 'canvas/types';
+
+export {
+	type Canvas,
+	type JpegConfig,
+	type PdfConfig,
+	type PngConfig,
+} from 'canvas/types';
+
+type CreateCanvasOptions = {
+	width: number;
+	height: number;
+};
+
+const createCanvasIso = async ({
+	width,
+	height,
+}: CreateCanvasOptions): Promise<HTMLCanvasElement | Canvas> => {
+	if (Meteor.isServer) {
+		const {createCanvas} = await import('canvas');
+		return createCanvas(width, height);
+	}
+
+	const browserCanvas = document.createElement('canvas');
+	browserCanvas.width = width;
+	browserCanvas.height = height;
+	return browserCanvas;
+};
+
+export const destroyCanvasIso = (canvas: HTMLCanvasElement | Canvas) => {
+	canvas.width = 0;
+	canvas.height = 0;
+	if (Meteor.isClient) {
+		(canvas as HTMLCanvasElement).remove();
+	}
+};
+
+type CreateContextOptions = {} & CreateCanvasOptions;
+
+export const createContextIso = async (
+	options: CreateContextOptions,
+): Promise<CanvasRenderingContext2D> => {
+	return createCanvasIso(options).then(
+		(canvas) => canvas.getContext('2d') as CanvasRenderingContext2D,
+	);
+};
+
+export const destroyContextIso = (context: CanvasRenderingContext2D) => {
+	destroyCanvasIso(context.canvas);
+};
diff --git a/imports/lib/dataURL.ts b/imports/lib/dataURL.ts
new file mode 100644
index 000000000..0da73dd30
--- /dev/null
+++ b/imports/lib/dataURL.ts
@@ -0,0 +1,3 @@
+const dataURL = (mimeType: string, base64: string) =>
+	`data:${mimeType};base64,${base64}`;
+export default dataURL;
diff --git a/imports/lib/pdf/pdf.tests.ts b/imports/lib/pdf/pdf.tests.ts
new file mode 100644
index 000000000..805d3c0c9
--- /dev/null
+++ b/imports/lib/pdf/pdf.tests.ts
@@ -0,0 +1,18 @@
+import {client, server} from '../../_test/fixtures';
+import {randomPDFUint8Array} from '../../_test/pdf';
+
+import {fetchPDF} from './pdf';
+
+client(__filename, () => {
+	it('should work on the client', async () => {
+		const data = randomPDFUint8Array();
+		await fetchPDF({data});
+	});
+});
+
+server(__filename, () => {
+	it('should work on the server', async () => {
+		const data = randomPDFUint8Array();
+		await fetchPDF({data});
+	});
+});
diff --git a/imports/lib/pdf/pdfthumbmails.tests.ts b/imports/lib/pdf/pdfthumbmails.tests.ts
new file mode 100644
index 000000000..1532d5ebc
--- /dev/null
+++ b/imports/lib/pdf/pdfthumbmails.tests.ts
@@ -0,0 +1,144 @@
+import {Buffer} from 'buffer';
+import {Readable} from 'stream';
+
+import {assert} from 'chai';
+
+import {client, server, throws} from '../../_test/fixtures';
+import {randomPDFUint8Array, randomPDFDataURI} from '../../_test/pdf';
+import {
+	assertEqual as assertEqualImages,
+	whiteRectanglePNG,
+} from '../../_test/image';
+
+import blobFromDataURL from '../blob/blobFromDataURL';
+import blobToBuffer from '../blob/blobToBuffer';
+import streamToBuffer from '../stream/streamToBuffer';
+
+import {
+	thumbnailDataURL,
+	thumbnailStream,
+	thumbnailBlob,
+	thumbnailBuffer,
+} from './pdfthumbnails';
+
+const width = 200;
+const height = 200;
+
+client(__filename, () => {
+	it('thumbnailDataURL should work', async () => {
+		const pdfDataURL = await randomPDFDataURI();
+		const pngDataURL = await thumbnailDataURL(
+			pdfDataURL,
+			{minWidth: width, minHeight: height},
+			{type: 'image/png'},
+		);
+
+		assert.typeOf(pngDataURL, 'string');
+
+		const buffer = await blobFromDataURL(pngDataURL).then(blobToBuffer);
+		const expected = await whiteRectanglePNG({width, height});
+
+		await assertEqualImages(buffer, expected);
+	});
+
+	it('thumbnailBlob should work', async () => {
+		const data = randomPDFUint8Array();
+		const blob = await thumbnailBlob(
+			{data},
+			{minWidth: width, minHeight: height},
+			{type: 'image/png'},
+		);
+		assert.instanceOf(blob, Blob);
+
+		const buffer = await blobToBuffer(blob);
+		const expected = await whiteRectanglePNG({width, height});
+
+		await assertEqualImages(buffer, expected);
+	});
+
+	it('thumbnailBuffer should NOT be implemented', async () => {
+		const data = randomPDFUint8Array();
+		await throws(
+			async () =>
+				thumbnailBuffer(
+					{data},
+					{minWidth: width, minHeight: height},
+					{type: 'image/png'},
+				),
+			/not implemented/i,
+		);
+	});
+
+	it('thumbnailStream should NOT be implemented', async () => {
+		const data = randomPDFUint8Array();
+		await throws(
+			async () =>
+				thumbnailStream(
+					{data},
+					{minWidth: width, minHeight: height},
+					{type: 'image/png'},
+				),
+			/not implemented/i,
+		);
+	});
+});
+
+server(__filename, () => {
+	it('thumbnailDataURL should NOT be implemented', async () => {
+		const url = await randomPDFDataURI();
+
+		await throws(
+			async () =>
+				thumbnailDataURL(
+					url,
+					{minWidth: width, minHeight: height},
+					{type: 'image/png'},
+				),
+			/not implemented/i,
+		);
+	});
+
+	it('thumbnailBlob should work', async () => {
+		const data = randomPDFUint8Array();
+
+		await throws(
+			async () =>
+				thumbnailBlob(
+					{data},
+					{minWidth: width, minHeight: height},
+					{type: 'image/png'},
+				),
+			/not implemented/i,
+		);
+	});
+
+	it('thumbnailBuffer should work', async () => {
+		const data = randomPDFUint8Array();
+		const buffer = await thumbnailBuffer(
+			{data},
+			{minWidth: width, minHeight: height},
+			{type: 'image/png'},
+		);
+		assert.instanceOf(buffer, Buffer);
+
+		const expected = await whiteRectanglePNG({width, height});
+
+		await assertEqualImages(buffer, expected);
+	});
+
+	it('thumbnailStream should work', async () => {
+		const data = randomPDFUint8Array();
+		const stream = await thumbnailStream(
+			{data},
+			{minWidth: width, minHeight: height},
+			{type: 'image/png'},
+		);
+		assert.instanceOf(stream, Readable);
+
+		const buffer = await streamToBuffer(stream);
+
+		const expected = await whiteRectanglePNG({width, height});
+
+		await assertEqualImages(buffer, expected);
+	});
+});
diff --git a/imports/lib/pdf/pdfthumbnails.ts b/imports/lib/pdf/pdfthumbnails.ts
index 826213eea..62f8d063c 100644
--- a/imports/lib/pdf/pdfthumbnails.ts
+++ b/imports/lib/pdf/pdfthumbnails.ts
@@ -2,15 +2,18 @@
 import {type Buffer} from 'buffer';
 import {type Readable} from 'stream';
 
+import addDays from 'date-fns/addDays';
+
+import {cache as lru, type IndexedDBPersistedLRUCache} from '../cache/lru';
+
 import {
 	type Canvas,
 	type JpegConfig,
 	type PdfConfig,
 	type PngConfig,
-} from 'canvas/types';
-import addDays from 'date-fns/addDays';
-
-import {cache as lru, type IndexedDBPersistedLRUCache} from '../cache/lru';
+	createContextIso,
+	destroyContextIso,
+} from '../canvas';
 
 import {type DocumentInitParameters, type PageViewport, fetchPDF} from './pdf';
 
@@ -22,44 +25,6 @@ if (Meteor.isClient) {
 	});
 }
 
-type CreateCanvasOptions = {
-	width: number;
-	height: number;
-};
-
-const createCanvasIso = async ({
-	width,
-	height,
-}: CreateCanvasOptions): Promise<HTMLCanvasElement | Canvas> => {
-	if (Meteor.isServer) {
-		const {createCanvas} = await import('canvas');
-		return createCanvas(width, height);
-	}
-
-	const browserCanvas = document.createElement('canvas');
-	browserCanvas.width = width;
-	browserCanvas.height = height;
-	return browserCanvas;
-};
-
-const destroyCanvasIso = (canvas: HTMLCanvasElement | Canvas) => {
-	canvas.width = 0;
-	canvas.height = 0;
-	if (Meteor.isClient) {
-		(canvas as HTMLCanvasElement).remove();
-	}
-};
-
-type CreateContextOptions = {} & CreateCanvasOptions;
-
-const createContextIso = async (
-	options: CreateContextOptions,
-): Promise<CanvasRenderingContext2D> => {
-	return createCanvasIso(options).then(
-		(canvas) => canvas.getContext('2d') as CanvasRenderingContext2D,
-	);
-};
-
 type RenderContext = {
 	canvasContext: CanvasRenderingContext2D;
 	viewport: PageViewport;
@@ -91,7 +56,7 @@ const createRenderContextIso = async (
 };
 
 const destroyRenderContextIso = (renderContext: RenderContext) => {
-	destroyCanvasIso(renderContext.canvasContext.canvas);
+	destroyContextIso(renderContext.canvasContext);
 	// @ts-expect-error This is for garbage collection.
 	renderContext.canvasContext = null;
 };
@@ -161,8 +126,12 @@ export const thumbnailDataURL = async (
 const toBlob = async (
 	canvas: HTMLCanvasElement,
 	{type, quality}: RenderOptions,
-) =>
-	new Promise<Blob>((resolve, reject) => {
+) => {
+	if (Meteor.isServer) {
+		throw new Error('not implemented');
+	}
+
+	return new Promise<Blob>((resolve, reject) => {
 		canvas.toBlob(
 			(blob: Blob | null) => {
 				if (blob === null) {
@@ -175,6 +144,7 @@ const toBlob = async (
 			quality,
 		);
 	});
+};
 
 export const thumbnailBlob = async (
 	document: DocumentInitParameters,
@@ -232,6 +202,10 @@ export const thumbnailBuffer = async (
 	pageOptions: PageOptions,
 	canvasRenderOptions: CanvasRenderOptions,
 ) => {
+	if (Meteor.isClient) {
+		throw new Error('not implemented');
+	}
+
 	const renderContext = await thumbnailRender(document, pageOptions);
 	const canvas = renderContext.canvasContext.canvas as unknown as Canvas;
 	const buffer = await toBuffer(canvas, canvasRenderOptions);
@@ -244,6 +218,10 @@ export const thumbnailStream = async (
 	pageOptions: PageOptions,
 	{type = 'image/png', config}: CanvasRenderOptions,
 ): Promise<Readable> => {
+	if (Meteor.isClient) {
+		throw new Error('not implemented');
+	}
+
 	const renderContext = await thumbnailRender(document, pageOptions);
 	const canvas = renderContext.canvasContext.canvas as unknown as Canvas;
 	let stream: Readable;
diff --git a/imports/lib/png/dataURL.ts b/imports/lib/png/dataURL.ts
index 0ff937c9c..b8a265a53 100644
--- a/imports/lib/png/dataURL.ts
+++ b/imports/lib/png/dataURL.ts
@@ -1,2 +1,4 @@
-const dataURL = (base64: string) => `data:image/png;base64,${base64}`;
+import _dataURL from '../dataURL';
+
+const dataURL = (base64: string) => _dataURL('image/png', base64);
 export default dataURL;
diff --git a/imports/ui/App.tests.tsx b/imports/ui/App.tests.tsx
index e6cd1ec52..e6c85d437 100644
--- a/imports/ui/App.tests.tsx
+++ b/imports/ui/App.tests.tsx
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import React from 'react';
 import {render, waitForElementToBeRemoved} from '@testing-library/react';
 
diff --git a/package-lock.json b/package-lock.json
index 02b936593..226876a5c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2448,6 +2448,16 @@
         "rimraf": "^3.0.2",
         "semver": "^7.3.5",
         "tar": "^6.1.11"
+      },
+      "dependencies": {
+        "node-fetch": {
+          "version": "2.7.0",
+          "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.7.0.tgz",
+          "integrity": "sha512-c4FRfUm/dbcWZ7U+1Wq0AwCyFL+3nt2bEw05wfxSz+DWpWsitgmSgYmy2dQdWyKC1694ELPqMs/YzUSNozLt8A==",
+          "requires": {
+            "whatwg-url": "^5.0.0"
+          }
+        }
       }
     },
     "@mongodb-js/saslprep": {
@@ -6766,6 +6776,11 @@
       "integrity": "sha512-wAV9QHOsNbwnWdNW2FYvE1P56wtgSbM+3SZcdGiWQILwVjACCXDCI3Ai8QlCjMDB8YK5zySiXZYBiwGmNY3lnw==",
       "dev": true
     },
+    "data-uri-to-buffer": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/data-uri-to-buffer/-/data-uri-to-buffer-4.0.1.tgz",
+      "integrity": "sha512-0R9ikRb668HB7QDxT1vkpuUBtqc53YyAwMwGeUFKRojY/NWKvdZ+9UYtRfGmhqNbRkTSVpMbmyhXipFFv2cb/A=="
+    },
     "data-view-buffer": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/data-view-buffer/-/data-view-buffer-1.0.1.tgz",
@@ -7376,6 +7391,17 @@
         "enquirer": "^2.3.6",
         "meow": "^6.1.1",
         "node-fetch": "^2.6.1"
+      },
+      "dependencies": {
+        "node-fetch": {
+          "version": "2.7.0",
+          "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.7.0.tgz",
+          "integrity": "sha512-c4FRfUm/dbcWZ7U+1Wq0AwCyFL+3nt2bEw05wfxSz+DWpWsitgmSgYmy2dQdWyKC1694ELPqMs/YzUSNozLt8A==",
+          "dev": true,
+          "requires": {
+            "whatwg-url": "^5.0.0"
+          }
+        }
       }
     },
     "emoji-regex": {
@@ -9002,6 +9028,15 @@
         "pend": "~1.2.0"
       }
     },
+    "fetch-blob": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/fetch-blob/-/fetch-blob-3.2.0.tgz",
+      "integrity": "sha512-7yAQpD2UMJzLi1Dqv7qFYnPbaPx7ZfFK6PiIxQ4PfkGPyNyl2Ugx+a/umUonmKqjhM4DnfbMvdX6otXq83soQQ==",
+      "requires": {
+        "node-domexception": "^1.0.0",
+        "web-streams-polyfill": "^3.0.3"
+      }
+    },
     "fflate": {
       "version": "0.4.8",
       "resolved": "https://registry.npmjs.org/fflate/-/fflate-0.4.8.tgz",
@@ -9276,6 +9311,14 @@
       "integrity": "sha512-yDYSgNMraqvnxiEXO4hi88+YZxaHC6QKzb5N84iRCTDeRO7ZALpir/lVmf/uXUhnwUr2O4HU8s/n6x+yNjQkHw==",
       "dev": true
     },
+    "formdata-polyfill": {
+      "version": "4.0.10",
+      "resolved": "https://registry.npmjs.org/formdata-polyfill/-/formdata-polyfill-4.0.10.tgz",
+      "integrity": "sha512-buewHzMvYL29jdeQTVILecSaZKnt/RJWjoZCF5OW60Z67/GmSLBkOFM7qh1PI3zFNtJbaZL5eQu1vLfazOwj4g==",
+      "requires": {
+        "fetch-blob": "^3.1.2"
+      }
+    },
     "formidable": {
       "version": "3.5.1",
       "resolved": "https://registry.npmjs.org/formidable/-/formidable-3.5.1.tgz",
@@ -12565,12 +12608,19 @@
       "resolved": "https://registry.npmjs.org/node-addon-api/-/node-addon-api-5.1.0.tgz",
       "integrity": "sha512-eh0GgfEkpnoWDq+VY8OyvYhFEzBk6jIYbRKdIlyTiAXIVJ8PyBaKb0rp7oDtoddbdoHWhq8wwr+XZ81F1rpNdA=="
     },
+    "node-domexception": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/node-domexception/-/node-domexception-1.0.0.tgz",
+      "integrity": "sha512-/jKZoMpw0F8GRwl4/eLROPA3cfcXtLApP0QzLmUT/HuPCZWyB7IY9ZrMeKw2O/nFIqPQB3PVM9aYm0F312AXDQ=="
+    },
     "node-fetch": {
-      "version": "2.7.0",
-      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.7.0.tgz",
-      "integrity": "sha512-c4FRfUm/dbcWZ7U+1Wq0AwCyFL+3nt2bEw05wfxSz+DWpWsitgmSgYmy2dQdWyKC1694ELPqMs/YzUSNozLt8A==",
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-3.3.2.tgz",
+      "integrity": "sha512-dRB78srN/l6gqWulah9SrxeYnxeddIG30+GOqK/9OlLVyLg3HPnr6SqOWTWOXKRwC2eGYCkZ59NNuSgvSrpgOA==",
       "requires": {
-        "whatwg-url": "^5.0.0"
+        "data-uri-to-buffer": "^4.0.0",
+        "fetch-blob": "^3.1.4",
+        "formdata-polyfill": "^4.0.10"
       }
     },
     "node-gyp": {
@@ -13617,12 +13667,6 @@
       "resolved": "https://registry.npmjs.org/path-type/-/path-type-4.0.0.tgz",
       "integrity": "sha512-gDKb8aZMDeD/tZWs9P6+q0J9Mwkdl6xMV8TjnGP3qJVJ06bdMgkbBlLU8IdfOsIsFz2BW1rNVT3XuNEl8zPAvw=="
     },
-    "path2d-polyfill": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/path2d-polyfill/-/path2d-polyfill-2.0.1.tgz",
-      "integrity": "sha512-ad/3bsalbbWhmBo0D6FZ4RNMwsLsPpL6gnvhuSaU5Vm7b06Kr5ubSltQQ0T7YKsiJQO+g22zJ4dJKNTXIyOXtA==",
-      "optional": true
-    },
     "pathval": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/pathval/-/pathval-1.1.1.tgz",
@@ -13630,12 +13674,12 @@
       "dev": true
     },
     "pdfjs-dist": {
-      "version": "3.11.174",
-      "resolved": "https://registry.npmjs.org/pdfjs-dist/-/pdfjs-dist-3.11.174.tgz",
-      "integrity": "sha512-TdTZPf1trZ8/UFu5Cx/GXB7GZM30LT+wWUNfsi6Bq8ePLnb+woNKtDymI2mxZYBpMbonNFqKmiz684DIfnd8dA==",
+      "version": "3.1.81",
+      "resolved": "https://registry.npmjs.org/pdfjs-dist/-/pdfjs-dist-3.1.81.tgz",
+      "integrity": "sha512-hZHVVbjU2Ac1VYyPFrg9fBcyS7EEdB8YFy5upk6LmnsXl10WxAavdiViGWi2C/xK0GZObEpSSJU1VnoF9t8n9w==",
       "requires": {
-        "canvas": "^2.11.2",
-        "path2d-polyfill": "^2.0.1"
+        "canvas": "^2.10.2",
+        "web-streams-polyfill": "^3.2.1"
       }
     },
     "pend": {
@@ -16444,6 +16488,11 @@
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
       "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg=="
     },
+    "web-streams-polyfill": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-3.2.1.tgz",
+      "integrity": "sha512-e0MO3wdXWKrLbL0DgGnUV7WHVuw9OUvL4hjgnPkIeEvESk74gAITi5G606JtZPp39cd8HA9VQzCIvA49LpPN5Q=="
+    },
     "webidl-conversions": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
diff --git a/package.json b/package.json
index 6a97ef2d0..6b967cc07 100644
--- a/package.json
+++ b/package.json
@@ -113,9 +113,10 @@
     "medidoc": "1.1.0",
     "mem": "^8.1.1",
     "meteor-node-stubs": "^1.2.5",
+    "node-fetch": "^3.3.2",
     "notistack": "^3.0.1",
     "papaparse": "^5.4.1",
-    "pdfjs-dist": "~3.11.174",
+    "pdfjs-dist": "~3.1.81",
     "qrcode.react": "^3.1.0",
     "rate-limiter-flexible": "^3.0.0",
     "react": "^18.2.0",
diff --git a/server/api/healthcheck/index.app-tests.ts b/server/api/healthcheck/index.app-tests.ts
index a665270ee..b904d96b6 100644
--- a/server/api/healthcheck/index.app-tests.ts
+++ b/server/api/healthcheck/index.app-tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 import request from 'supertest';
 
diff --git a/server/api/ics/index.app-tests.ts b/server/api/ics/index.app-tests.ts
index 7d0b04af1..7818df423 100644
--- a/server/api/ics/index.app-tests.ts
+++ b/server/api/ics/index.app-tests.ts
@@ -1,5 +1,3 @@
-// eslint-disable-next-line import/no-unassigned-import
-import 'regenerator-runtime/runtime.js';
 import {assert} from 'chai';
 import request from 'supertest';
 
diff --git a/server/polyfill.ts b/server/polyfill.ts
index 7678d9eca..0125dead4 100644
--- a/server/polyfill.ts
+++ b/server/polyfill.ts
@@ -3,3 +3,6 @@ import 'regenerator-runtime/runtime.js';
 
 // eslint-disable-next-line import/no-unassigned-import
 import 'core-js/features/string/replace-all';
+
+// eslint-disable-next-line import/no-unassigned-import
+import './polyfill/fetch';
diff --git a/server/polyfill/fetch.ts b/server/polyfill/fetch.ts
new file mode 100644
index 000000000..6dc26f591
--- /dev/null
+++ b/server/polyfill/fetch.ts
@@ -0,0 +1,25 @@
+// SEE
+// https://github.com/node-fetch/node-fetch/blob/8b3320d2a7c07bce4afc6b2bf6c3bbddda85b01f/README.md#providing-global-access
+
+import process from 'process';
+
+import fetch, {Blob, Headers, Request, Response} from 'node-fetch';
+
+import semver from 'semver';
+
+if (semver.gte(process.version, '18.0.0')) {
+	// eslint-disable-next-line unicorn/prefer-module
+	throw new Error(`Remove node-fetch polyfill located at '${__filename}'.`);
+}
+
+if (Meteor.isServer && !globalThis.fetch) {
+	// @ts-expect-error fetch polyfill has incorrect type.
+	globalThis.fetch = fetch;
+	globalThis.Blob = Blob;
+	// @ts-expect-error Headers polyfill has incorrect type.
+	globalThis.Headers = Headers;
+	// @ts-expect-error Request polyfill has incorrect type.
+	globalThis.Request = Request;
+	// @ts-expect-error Response polyfill has incorrect type.
+	globalThis.Response = Response;
+}