feat: report error when 'needs' refers to a non-existing action (#46)

Fixes #7

gulpfile.ts

@@ -15,12 +15,16 @@ gulp.task(
     gulp.series(
       BuildTasks.clean,
       BuildTasks.compile,
-      LinterTasks.copyFiles,
-      LinterTasks.generatePackageJson,
-      VSCodeTasks.copyFiles,
-      VSCodeTasks.generatePackageJson,
+      gulp.parallel([
+        LinterTasks.copyFiles,
+        LinterTasks.generatePackageJson,
+        VSCodeTasks.copyFiles,
+        VSCodeTasks.generatePackageJson,
+      ]),
     ),
-    gulp.parallel([BuildTasks.prettier, BuildTasks.tslint, BuildTasks.jestCI]),
+    BuildTasks.prettier,
+    BuildTasks.tslint,
+    BuildTasks.jestCI,
   ]),
 );
 

src/analysis/properties-analyzer.ts

@@ -4,7 +4,7 @@
 
 import { BoundNodeVisitor } from "../binding/bound-node-visitor";
 import { DiagnosticBag } from "../util/diagnostics";
-import { BoundDocument, BoundResolves, BoundSecrets, BoundOn, BoundEnv } from "../binding/bound-nodes";
+import { BoundDocument, BoundResolves, BoundSecrets, BoundOn, BoundEnv, BoundNeeds } from "../binding/bound-nodes";
 import { MAXIMUM_SUPPORTED_SECRETS } from "../util/constants";
 import * as webhooks from "@octokit/webhooks-definitions";
 
@@ -33,6 +33,14 @@ class PropertiesAnalyzer extends BoundNodeVisitor {
     }
   }
 
+  protected visitNeeds(node: BoundNeeds): void {
+    for (const action of node.actions) {
+      if (!this.actions.has(action.value)) {
+        this.bag.actionDoesNotExist(action.value, action.syntax.range);
+      }
+    }
+  }
+
   protected visitSecrets(node: BoundSecrets): void {
     const localSecrets = new Set<string>();
     for (const secret of node.secrets) {

src/util/diagnostics.ts

@@ -26,15 +26,17 @@ export enum DiagnosticCode {
   PropertyMustBeDefined,
   InvalidProperty,
   DuplicateKey,
-  ReservedEnvironmentVariable,
 
-  // Analysis:
-  TooManySecrets,
-  DuplicateSecrets,
+  // Block Analysis
   TooManyActions,
   DuplicateBlock,
+
+  // Property Analysis
+  TooManySecrets,
+  DuplicateSecrets,
   ActionDoesNotExist,
   UnrecognizedEvent,
+  ReservedEnvironmentVariable,
 }
 
 export interface Diagnostic {

test/properties-analysis.spec.ts

@@ -109,6 +109,35 @@ ERROR: The action 'not_found' does not exist in the same workflow file.
 `);
   });
 
+  it("reports error on needing a non-existing action", () => {
+    expectDiagnostics(`
+action "a" {
+    uses = "./ci"
+}
+action "b" {
+    uses = "./ci"
+}
+action "c" {
+    uses = "./ci"
+    needs = [
+      "a",
+      "b",
+      "not_found"
+    ]
+}
+`).toMatchInlineSnapshot(`
+"
+ERROR: The action 'not_found' does not exist in the same workflow file.
+ 11 |       \\"a\\",
+ 12 |       \\"b\\",
+ 13 |       \\"not_found\\"
+    |       ^^^^^^^^^^^
+ 14 |     ]
+ 15 | }
+"
+`);
+  });
+
   it("reports errors on unknown events", () => {
     expectDiagnostics(`
 workflow "x" {