I hate the way GitHub Actions process inputs

action.yml

@@ -8,66 +8,85 @@ inputs:
   modrinth-id:
     description: The ID of the Modrinth project to upload to
     required: false
+    default: ${undefined}
   modrinth-token:
     description: A valid token for the Modrinth API
     required: false
+    default: ${undefined}
 
   curseforge-id:
     description: The ID of the CurseForge project to upload to
     required: false
+    default: ${undefined}
   curseforge-token:
     description: A valid token for the CurseForge API
     required: false
+    default: ${undefined}
 
   github-tag:
     description: The tag name of the release to upload assets to
     required: false
+    default: ${undefined}
   github-token:
     description: A valid token for the GitHub API
     required: false
+    default: ${undefined}
 
   files:
     description: A glob of the files to upload
     required: false
+    default: ${undefined}
   files-primary:
     description: A glob of the primary files to upload
     required: false
+    default: ${undefined}
   files-secondary:
     description: A glob of the secondary files to upload
     required: false
+    default: ${undefined}
 
   name:
     description: The name of the version
     required: false
+    default: ${undefined}
   version:
     description: The version number
     required: false
+    default: ${undefined}
   version-type:
     description: The type of the release - alpha, beta, or release
     required: false
+    default: ${undefined}
 
   changelog:
     description: The changelog for this version
     required: false
+    default: ${undefined}
   changelog-file:
     description: A glob of the changelog file
     required: false
+    default: ${undefined}
 
   loaders:
     description: A list of supported mod loaders
     required: false
+    default: ${undefined}
   game-versions:
     description: A list of supported Minecraft versions
     required: false
+    default: ${undefined}
   dependencies:
     description: A list of dependencies
     required: false
+    default: ${undefined}
   version-resolver:
     description: Determines the way automatic game-versions resolvement works
     required: false
+    default: ${undefined}
   java:
     description: A list of supported Java versions
     required: false
+    default: ${undefined}
 runs:
   using: node12
   main: dist/index.js

src/utils/input-utils.ts

@@ -3,6 +3,8 @@ import process from "process";
 // eslint-disable-next-line @typescript-eslint/no-empty-interface
 interface InputObject extends Record<string, string | InputObject> { }
 
+const undefinedValue = "${undefined}";
+
 export function getInputAsObject(): Record<string, InputObject> {
     const inputs = Object.entries(process.env).filter(([key, _]) => key.startsWith("INPUT_"));
     const input = {};
@@ -14,6 +16,10 @@ export function getInputAsObject(): Record<string, InputObject> {
 }
 
 function init(root: InputObject, path: string[], value: string): void {
+    if (value === undefinedValue) {
+        return;
+    }
+
     const name = path.reduce((a, b, i) => a + (i === 0 ? b : (b.substring(0, 1).toUpperCase() + b.substring(1))), "");
     root[name] = value;
     if (path.length === 1) {

test/input-utils.test.ts

@@ -8,6 +8,7 @@ describe("getInputAsObject", () => {
         "object": { foo: "bar" },
         "number": 1,
         "array": ["foo", "bar"],
+        "undefined": "${undefined}",
 
         "files-primary": "primaryPath",
         "files-secondary": "secondaryPath",
@@ -64,4 +65,9 @@ describe("getInputAsObject", () => {
         expect(input).toHaveProperty("this.is.a.very.long.name", "foo");
         expect(input).toHaveProperty("thisIsAVeryLongName", "foo");
     });
+
+    test("special case for GitHub Actions: ${undefined} transforms into undefined", () => {
+        const input = getInputAsObject();
+        expect(input.undefined).toBeUndefined();
+    });
 });