diff --git a/package.json b/package.json
index 1f3df5673..10cd3d0c1 100644
--- a/package.json
+++ b/package.json
@@ -97,6 +97,7 @@
         "style-loader": "^1.2.1",
         "svg-url-loader": "^6.0.0",
         "terser-webpack-plugin": "^3.0.6",
+        "ts-essentials": "^9.1.2",
         "twin.macro": "^2.0.7",
         "typescript": "^4.2.4",
         "webpack": "^4.43.0",
diff --git a/resources/scripts/api/definitions/index.d.ts b/resources/scripts/api/definitions/index.d.ts
new file mode 100644
index 000000000..68925c863
--- /dev/null
+++ b/resources/scripts/api/definitions/index.d.ts
@@ -0,0 +1,32 @@
+import { MarkRequired } from 'ts-essentials';
+
+export type UUID = string;
+
+// eslint-disable-next-line @typescript-eslint/no-empty-interface
+export interface Model {}
+
+interface ModelWithRelationships extends Model {
+    relationships: Record<string, unknown>;
+}
+
+/**
+ * Allows a model to have optional relationships that are marked as being
+ * present in a given pathway. This allows different API calls to specify the
+ * "completeness" of a response object without having to make every API return
+ * the same information, or every piece of logic do explicit null checking.
+ *
+ * Example:
+ *  >> const user: WithLoaded<User, 'servers'> = {};
+ *  >> // "user.servers" is no longer potentially undefined.
+ */
+type WithLoaded<M extends ModelWithRelationships, R extends keyof M['relationships']> = M & {
+    relationships: MarkRequired<M['relationships'], R>;
+}
+
+/**
+ * Helper type that allows you to infer the type of an object by giving
+ * it the specific API request function with a return type. For example:
+ *
+ * type Egg = InferModel<typeof getEgg>;
+ */
+export type InferModel<T extends (...args: any) => any> = ReturnType<T> extends Promise<infer U> ? U : T;
diff --git a/resources/scripts/api/definitions/user/index.ts b/resources/scripts/api/definitions/user/index.ts
new file mode 100644
index 000000000..7d8db7094
--- /dev/null
+++ b/resources/scripts/api/definitions/user/index.ts
@@ -0,0 +1,2 @@
+export * from './models.d';
+export { default as Transformers, MetaTransformers } from './transformers';
diff --git a/resources/scripts/api/definitions/user/models.d.ts b/resources/scripts/api/definitions/user/models.d.ts
new file mode 100644
index 000000000..d462cadf8
--- /dev/null
+++ b/resources/scripts/api/definitions/user/models.d.ts
@@ -0,0 +1,2 @@
+// empty export
+export type _T = string;
diff --git a/resources/scripts/api/definitions/user/transformers.ts b/resources/scripts/api/definitions/user/transformers.ts
new file mode 100644
index 000000000..a69ad708d
--- /dev/null
+++ b/resources/scripts/api/definitions/user/transformers.ts
@@ -0,0 +1,5 @@
+export default class Transformers {
+}
+
+export class MetaTransformers {
+}
diff --git a/tsconfig.json b/tsconfig.json
index 26423ecd6..578a73e31 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -22,6 +22,9 @@
       "@/*": [
         "./resources/scripts/*"
       ],
+      "@definitions/*": [
+        "./resources/scripts/api/definitions/*"
+      ],
       "@feature/*": [
         "./resources/scripts/components/server/features/*"
       ]
diff --git a/webpack.config.js b/webpack.config.js
index 777b0be1b..8a9b76609 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -60,6 +60,7 @@ module.exports = {
         extensions: ['.ts', '.tsx', '.js', '.json'],
         alias: {
             '@': path.join(__dirname, '/resources/scripts'),
+            '@definitions': path.join(__dirname, '/resources/scripts/api/definitions'),
             '@feature': path.join(__dirname, '/resources/scripts/components/server/features'),
         },
         symlinks: false,
diff --git a/yarn.lock b/yarn.lock
index 9c67ff246..4b67c3662 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7481,6 +7481,11 @@ tryer@^1.0.1:
   resolved "https://registry.yarnpkg.com/tryer/-/tryer-1.0.1.tgz#f2c85406800b9b0f74c9f7465b81eaad241252f8"
   integrity sha512-c3zayb8/kWWpycWYg87P71E1S1ZL6b6IJxfb5fvsUgsf0S2MVGaDhDXXjDMpdCpfWXqptc+4mXwmiy1ypXqRAA==
 
+ts-essentials@^9.1.2:
+  version "9.1.2"
+  resolved "https://registry.yarnpkg.com/ts-essentials/-/ts-essentials-9.1.2.tgz#46db6944b73b4cd603f3d959ef1123c16ba56f59"
+  integrity sha512-EaSmXsAhEiirrTY1Oaa7TSpei9dzuCuFPmjKRJRPamERYtfaGS8/KpOSbjergLz/Y76/aZlV9i/krgzsuWEBbg==
+
 ts-toolbelt@^8.0.7:
   version "8.0.7"
   resolved "https://registry.yarnpkg.com/ts-toolbelt/-/ts-toolbelt-8.0.7.tgz#4dad2928831a811ee17dbdab6eb1919fc0a295bf"