diff --git a/actions-languageservice/jest.config.js b/actions-languageservice/jest.config.js
index 58f936b..f8c93bb 100644
--- a/actions-languageservice/jest.config.js
+++ b/actions-languageservice/jest.config.js
@@ -12,5 +12,6 @@ export default {
       },
     ],
   },
-  moduleFileExtensions: ["ts", "js"]
+  moduleFileExtensions: ["ts", "js"],
+  reporters: ["default", "github-actions"]
 };
diff --git a/actions-languageservice/src/complete.test.ts b/actions-languageservice/src/complete.test.ts
index 08d73e7..bf10a08 100644
--- a/actions-languageservice/src/complete.test.ts
+++ b/actions-languageservice/src/complete.test.ts
@@ -25,7 +25,7 @@ describe("completion", () => {
     const input = `on: push
 jobs:
   build:
-      runs-on: [self-hosted, u|]`;
+    runs-on: [self-hosted, u|]`;
     const result = await complete(...getPositionFromCursor(input));
 
     expect(result).not.toBeUndefined();
@@ -57,6 +57,39 @@ jobs:
     expect(result.length).toEqual(20);
   });
 
+  it("string definition completion in sequence", async () => {
+    const input = `on:
+  release:
+    types:
+      - |`;
+    const result = await complete(...getPositionFromCursor(input));
+    expect(result.map(x => x.label)).toEqual([
+      "created",
+      "deleted",
+      "edited",
+      "prereleased",
+      "published",
+      "released",
+      "unpublished"
+    ]);
+  });
+
+  it("string definition completion", async () => {
+    const input = `on:
+  release:
+    types: |`;
+    const result = await complete(...getPositionFromCursor(input));
+    expect(result.map(x => x.label)).toEqual([
+      "created",
+      "deleted",
+      "edited",
+      "prereleased",
+      "published",
+      "released",
+      "unpublished"
+    ]);
+  });
+
   it("map keys filter out existing values", async () => {
     const input = `on: push
 jobs:
diff --git a/actions-languageservice/src/value-providers/default.ts b/actions-languageservice/src/value-providers/default.ts
index 342b479..f0398b2 100644
--- a/actions-languageservice/src/value-providers/default.ts
+++ b/actions-languageservice/src/value-providers/default.ts
@@ -1,7 +1,8 @@
-import {Definition} from "@github/actions-workflow-parser/templates/schema/definition";
 import {BooleanDefinition} from "@github/actions-workflow-parser/templates/schema/boolean-definition";
+import {Definition} from "@github/actions-workflow-parser/templates/schema/definition";
 import {MappingDefinition} from "@github/actions-workflow-parser/templates/schema/mapping-definition";
 import {OneOfDefinition} from "@github/actions-workflow-parser/templates/schema/one-of-definition";
+import {StringDefinition} from "@github/actions-workflow-parser/templates/schema/string-definition";
 import {getWorkflowSchema} from "@github/actions-workflow-parser/workflows/workflow-schema";
 import {Value, ValueProvider} from "./config";
 
@@ -37,13 +38,22 @@ export function defaultValueProviders(): {[key: string]: ValueProvider} {
 
 function definitionValueProvider(key: string, definitions: {[key: string]: Definition}): ValueProvider | undefined {
   const def = definitions[key];
+
   if (def instanceof MappingDefinition) {
     return mappingValueProvider(def);
-  } else if (def instanceof OneOfDefinition) {
+  }
+
+  if (def instanceof OneOfDefinition) {
     return oneOfValueProvider(def, definitions);
-  } else if (def instanceof BooleanDefinition) {
+  }
+
+  if (def instanceof BooleanDefinition) {
     return () => stringsToValues(["true", "false"]);
   }
+
+  if (def instanceof StringDefinition && def.constant) {
+    return () => stringsToValues([def.constant]);
+  }
 }
 
 function mappingValueProvider(mappingDefinition: MappingDefinition): ValueProvider {
diff --git a/package-lock.json b/package-lock.json
index 29b5216..60c8303 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -665,9 +665,9 @@
       "link": true
     },
     "node_modules/@github/actions-workflow-parser": {
-      "version": "0.0.12",
-      "resolved": "https://npm.pkg.github.com/download/@github/actions-workflow-parser/0.0.12/b7b753fe96c1be36cc6f7952be76301ee3a10f12",
-      "integrity": "sha512-tPtIiRpCilAGUygpCCBv7yEamw9/Te0SF1lBN5BljxLE0atb34bLMGR3yyKjE+S3R3xUf3jmNNcTiGRLIqnAfw==",
+      "version": "0.0.13",
+      "resolved": "https://npm.pkg.github.com/download/@github/actions-workflow-parser/0.0.13/ff0fdf35ecf25145c56cb7d6d6b93b5a6b0774de",
+      "integrity": "sha512-kQGTQZUrBqK0qK2AlSrljyhzjPh/LPcX+cg6Tc3ZmQmoLlqgIm9bN30iC5JDKzsY7j3otedQQ2YfniFmCRBWRA==",
       "license": "MIT",
       "dependencies": {
         "@github/actions-expressions": "*",
@@ -10927,9 +10927,9 @@
       }
     },
     "@github/actions-workflow-parser": {
-      "version": "0.0.12",
-      "resolved": "https://npm.pkg.github.com/download/@github/actions-workflow-parser/0.0.12/b7b753fe96c1be36cc6f7952be76301ee3a10f12",
-      "integrity": "sha512-tPtIiRpCilAGUygpCCBv7yEamw9/Te0SF1lBN5BljxLE0atb34bLMGR3yyKjE+S3R3xUf3jmNNcTiGRLIqnAfw==",
+      "version": "0.0.13",
+      "resolved": "https://npm.pkg.github.com/download/@github/actions-workflow-parser/0.0.13/ff0fdf35ecf25145c56cb7d6d6b93b5a6b0774de",
+      "integrity": "sha512-kQGTQZUrBqK0qK2AlSrljyhzjPh/LPcX+cg6Tc3ZmQmoLlqgIm9bN30iC5JDKzsY7j3otedQQ2YfniFmCRBWRA==",
       "requires": {
         "@github/actions-expressions": "*",
         "yaml": "^2.0.0-8"