diff --git a/__tests__/command.test.ts b/__tests__/command.test.ts
index c5bb1dd..b650a61 100644
--- a/__tests__/command.test.ts
+++ b/__tests__/command.test.ts
@@ -17,7 +17,7 @@ describe('@actions/core/src/command', () => {
   afterEach(() => {})
 
   afterAll(() => {
-    process.stdout.write = (originalWriteFunction as unknown) as (
+    process.stdout.write = originalWriteFunction as unknown as (
       str: string
     ) => boolean
   })
@@ -51,8 +51,7 @@ describe('@actions/core/src/command', () => {
     command.issueCommand(
       'some-command',
       {
-        name:
-          'percent % percent % cr \r cr \r lf \n lf \n colon : colon : comma , comma ,'
+        name: 'percent % percent % cr \r cr \r lf \n lf \n colon : colon : comma , comma ,'
       },
       ''
     )
@@ -117,11 +116,11 @@ describe('@actions/core/src/command', () => {
     command.issueCommand(
       'some-command',
       {
-        prop1: ({test: 'object'} as unknown) as string,
-        prop2: (123 as unknown) as string,
-        prop3: (true as unknown) as string
+        prop1: {test: 'object'} as unknown as string,
+        prop2: 123 as unknown as string,
+        prop3: true as unknown as string
       },
-      ({test: 'object'} as unknown) as string
+      {test: 'object'} as unknown as string
     )
     assertWriteCalls([
       `::some-command prop1={"test"%3A"object"},prop2=123,prop3=true::{"test":"object"}${os.EOL}`
diff --git a/__tests__/summary.test.ts b/__tests__/summary.test.ts
index c13b017..b7798de 100644
--- a/__tests__/summary.test.ts
+++ b/__tests__/summary.test.ts
@@ -150,10 +150,7 @@ describe('@actions/core/src/summary', () => {
   })
 
   it('adds EOL', async () => {
-    await summary
-      .addRaw(fixtures.text)
-      .addEOL()
-      .write()
+    await summary.addRaw(fixtures.text).addEOL().write()
     await assertSummary(fixtures.text + os.EOL)
   })
 
diff --git a/package-lock.json b/package-lock.json
index 1e36713..4652aea 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -18,9 +18,9 @@
       }
     },
     "node_modules/@actions/http-client": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-2.0.1.tgz",
-      "integrity": "sha512-PIXiMVtz6VvyaRsGY268qvj57hXQEpsYogYOu2nrQhlf+XCGmZstmuZBbAybUl1nQGnvS1k1eEsQ69ZoD7xlSw==",
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-2.1.0.tgz",
+      "integrity": "sha512-BonhODnXr3amchh4qkmjPMUO8mFi/zLaaCeCAJZqch8iQqyDnVIkySjB38VHAC8IJ+bnlgfOqlhpyCUZHlQsqw==",
       "dependencies": {
         "tunnel": "^0.0.6"
       }
@@ -56,9 +56,9 @@
   },
   "dependencies": {
     "@actions/http-client": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-2.0.1.tgz",
-      "integrity": "sha512-PIXiMVtz6VvyaRsGY268qvj57hXQEpsYogYOu2nrQhlf+XCGmZstmuZBbAybUl1nQGnvS1k1eEsQ69ZoD7xlSw==",
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-2.1.0.tgz",
+      "integrity": "sha512-BonhODnXr3amchh4qkmjPMUO8mFi/zLaaCeCAJZqch8iQqyDnVIkySjB38VHAC8IJ+bnlgfOqlhpyCUZHlQsqw==",
       "requires": {
         "tunnel": "^0.0.6"
       }
diff --git a/package.json b/package.json
index 1f3824d..629b4a2 100644
--- a/package.json
+++ b/package.json
@@ -30,7 +30,7 @@
   "scripts": {
     "audit-moderate": "npm install && npm audit --json --audit-level=moderate > audit.json",
     "test": "echo \"Error: run tests from root\" && exit 1",
-    "tsc": "tsc"
+    "tsc": "tsc -p tsconfig.json"
   },
   "bugs": {
     "url": "https://github.com/actions/toolkit/issues"
@@ -43,4 +43,4 @@
     "@types/node": "^12.0.2",
     "@types/uuid": "^8.3.4"
   }
-}
+}
\ No newline at end of file
diff --git a/tsconfig.json b/tsconfig.json
index a8b812a..3bb20cf 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -3,6 +3,7 @@
   "compilerOptions": {
     "baseUrl": "./",
     "outDir": "./lib",
+    "declaration": true,
     "rootDir": "./src"
   },
   "include": [