diff --git a/js-packages/@fortawesome/fontawesome-common-types/index.d.ts b/js-packages/@fortawesome/fontawesome-common-types/index.d.ts
index 5677fa260..3981fa1cb 100644
--- a/js-packages/@fortawesome/fontawesome-common-types/index.d.ts
+++ b/js-packages/@fortawesome/fontawesome-common-types/index.d.ts
@@ -14,6 +14,14 @@ export interface IconDefinition extends IconLookup {
     string, // unicode
     string // svgPathData
   ];
+
+  [index: string]: [
+    number, // width
+    number, // height
+    string[], // ligatures
+    string, // unicode
+    string // svgPathData
+  ] | IconName | IconPrefix;
 }
 
 export interface IconPack {
diff --git a/js-packages/@fortawesome/fontawesome-svg-core/index.d.ts b/js-packages/@fortawesome/fontawesome-svg-core/index.d.ts
index 0d8fd8b5b..8a42421c7 100644
--- a/js-packages/@fortawesome/fontawesome-svg-core/index.d.ts
+++ b/js-packages/@fortawesome/fontawesome-svg-core/index.d.ts
@@ -110,4 +110,5 @@ type IconDefinitionOrPack = IconDefinition | IconPack;
 export interface Library {
   add(...definitions: IconDefinitionOrPack[]): void;
   reset(): void;
+  readonly definitions: {fas: IconDefinition, fab: IconDefinition, far: IconDefinition, fal: IconDefinition};
 }