Add initial eslint setup

.eslintrc.json

@@ -0,0 +1,16 @@
+{
+  "env": { "node": true, "jest": true },
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": { "ecmaVersion": 2020, "sourceType": "module" },
+  "extends": [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/eslint-recommended",
+    "plugin:@typescript-eslint/recommended",
+    "plugin:import/errors",
+    "plugin:import/warnings",
+    "plugin:import/typescript",
+    "plugin:prettier/recommended",
+    "prettier/@typescript-eslint"
+  ],
+  "plugins": ["@typescript-eslint", "jest"]
+}

.github/workflows/workflow.yml

@@ -1,4 +1,5 @@
 name: Tests
+
 on:
   pull_request:
     branches:
@@ -14,9 +15,11 @@ on:
 jobs:
   test:
     name: Test on ${{ matrix.os }}
+
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macOS-latest]
+
     runs-on: ${{ matrix.os }}
 
     steps:
@@ -29,7 +32,12 @@ jobs:
     - run: npm ci
 
     - name: Prettier Format Check
+      if: matrix.os == 'ubuntu-latest'
       run: npm run format-check
 
+    - name: ESLint Check
+      if: matrix.os == 'ubuntu-latest'
+      run: npm run lint
+
     - name: Build & Test
       run: npm run test

__tests__/restore.test.ts

@@ -1,9 +1,7 @@
 import * as core from "@actions/core";
 import * as exec from "@actions/exec";
 import * as io from "@actions/io";
-
 import * as path from "path";
-
 import * as cacheHttpClient from "../src/cacheHttpClient";
 import { Inputs } from "../src/constants";
 import { ArtifactCacheEntry } from "../src/contracts";
@@ -107,7 +105,7 @@ test("restore with no cache found", async () => {
     const stateMock = jest.spyOn(core, "saveState");
 
     const clientMock = jest.spyOn(cacheHttpClient, "getCacheEntry");
-    clientMock.mockImplementation(_ => {
+    clientMock.mockImplementation(() => {
         return Promise.resolve(null);
     });
 
@@ -134,7 +132,7 @@ test("restore with server error should fail", async () => {
     const stateMock = jest.spyOn(core, "saveState");
 
     const clientMock = jest.spyOn(cacheHttpClient, "getCacheEntry");
-    clientMock.mockImplementation(_ => {
+    clientMock.mockImplementation(() => {
         throw new Error("HTTP Error Occurred");
     });
 
@@ -168,7 +166,7 @@ test("restore with restore keys and no cache found", async () => {
     const stateMock = jest.spyOn(core, "saveState");
 
     const clientMock = jest.spyOn(cacheHttpClient, "getCacheEntry");
-    clientMock.mockImplementation(_ => {
+    clientMock.mockImplementation(() => {
         return Promise.resolve(null);
     });
 
@@ -202,7 +200,7 @@ test("restore with cache found", async () => {
         archiveLocation: "www.actionscache.test/download"
     };
     const getCacheMock = jest.spyOn(cacheHttpClient, "getCacheEntry");
-    getCacheMock.mockImplementation(_ => {
+    getCacheMock.mockImplementation(() => {
         return Promise.resolve(cacheEntry);
     });
     const tempPath = "/foo/bar";
@@ -278,7 +276,7 @@ test("restore with cache found for restore key", async () => {
         archiveLocation: "www.actionscache.test/download"
     };
     const getCacheMock = jest.spyOn(cacheHttpClient, "getCacheEntry");
-    getCacheMock.mockImplementation(_ => {
+    getCacheMock.mockImplementation(() => {
         return Promise.resolve(cacheEntry);
     });
     const tempPath = "/foo/bar";

jest.config.js

@@ -1,22 +1,23 @@
-require('nock').disableNetConnect();
+require("nock").disableNetConnect();
 
 module.exports = {
-  clearMocks: true,
+    clearMocks: true,
-  moduleFileExtensions: ['js', 'ts'],
+    moduleFileExtensions: ["js", "ts"],
-  testEnvironment: 'node',
+    testEnvironment: "node",
-  testMatch: ['**/*.test.ts'],
+    testMatch: ["**/*.test.ts"],
-  testRunner: 'jest-circus/runner',
+    testRunner: "jest-circus/runner",
-  transform: {
+    transform: {
-    '^.+\\.ts$': 'ts-jest'
+        "^.+\\.ts$": "ts-jest"
-  },
+    },
-  verbose: true
+    verbose: true
-}
+};
 
-const processStdoutWrite = process.stdout.write.bind(process.stdout)
+const processStdoutWrite = process.stdout.write.bind(process.stdout);
+// eslint-disable-next-line @typescript-eslint/explicit-function-return-type
 process.stdout.write = (str, encoding, cb) => {
-  // Core library will directly call process.stdout.write for commands
+    // Core library will directly call process.stdout.write for commands
-  // We don't want :: commands to be executed by the runner during tests
+    // We don't want :: commands to be executed by the runner during tests
-  if (!str.match(/^::/)) {
+    if (!str.match(/^::/)) {
-    return processStdoutWrite(str, encoding, cb);
+        return processStdoutWrite(str, encoding, cb);
-  }
+    }
-}
+};

package.json

@@ -7,8 +7,9 @@
   "scripts": {
     "build": "tsc",
     "test": "tsc --noEmit && jest --coverage",
-    "format": "prettier --write **/*.ts",
+    "lint": "eslint '**/*.ts' --cache",
-    "format-check": "prettier --check **/*.ts",
+    "format": "prettier --write '**/*.ts'",
+    "format-check": "prettier --check '**/*.ts'",
     "release": "ncc build -o dist/restore src/restore.ts && ncc build -o dist/save src/save.ts && git add -f dist/"
   },
   "repository": {
@@ -34,7 +35,14 @@
     "@types/nock": "^11.1.0",
     "@types/node": "^12.0.4",
     "@types/uuid": "^3.4.5",
+    "@typescript-eslint/eslint-plugin": "^2.7.0",
+    "@typescript-eslint/parser": "^2.7.0",
     "@zeit/ncc": "^0.20.5",
+    "eslint": "^6.6.0",
+    "eslint-config-prettier": "^6.5.0",
+    "eslint-plugin-import": "^2.18.2",
+    "eslint-plugin-jest": "^23.0.3",
+    "eslint-plugin-prettier": "^3.1.1",
     "jest": "^24.8.0",
     "jest-circus": "^24.7.1",
     "nock": "^11.7.0",

src/cacheHttpClient.ts

@@ -1,13 +1,40 @@
 import * as core from "@actions/core";
 import * as fs from "fs";
-
 import { BearerCredentialHandler } from "typed-rest-client/Handlers";
 import { HttpClient } from "typed-rest-client/HttpClient";
 import { IHttpClientResponse } from "typed-rest-client/Interfaces";
-import { RestClient, IRequestOptions } from "typed-rest-client/RestClient";
+import { IRequestOptions, RestClient } from "typed-rest-client/RestClient";
-
 import { ArtifactCacheEntry } from "./contracts";
 
+function getCacheUrl(): string {
+    // Ideally we just use ACTIONS_CACHE_URL
+    const cacheUrl: string = (
+        process.env["ACTIONS_CACHE_URL"] ||
+        process.env["ACTIONS_RUNTIME_URL"] ||
+        ""
+    ).replace("pipelines", "artifactcache");
+    if (!cacheUrl) {
+        throw new Error(
+            "Cache Service Url not found, unable to restore cache."
+        );
+    }
+
+    core.debug(`Cache Url: ${cacheUrl}`);
+    return cacheUrl;
+}
+
+function createAcceptHeader(type: string, apiVersion: string): string {
+    return `${type};api-version=${apiVersion}`;
+}
+
+function getRequestOptions(): IRequestOptions {
+    const requestOptions: IRequestOptions = {
+        acceptHeader: createAcceptHeader("application/json", "5.2-preview.1")
+    };
+
+    return requestOptions;
+}
+
 export async function getCacheEntry(
     keys: string[]
 ): Promise<ArtifactCacheEntry | null> {
@@ -43,16 +70,6 @@ export async function getCacheEntry(
     return cacheResult;
 }
 
-export async function downloadCache(
-    cacheEntry: ArtifactCacheEntry,
-    archivePath: string
-): Promise<void> {
-    const stream = fs.createWriteStream(archivePath);
-    const httpClient = new HttpClient("actions/cache");
-    const downloadResponse = await httpClient.get(cacheEntry.archiveLocation!);
-    await pipeResponseToStream(downloadResponse, stream);
-}
-
 async function pipeResponseToStream(
     response: IHttpClientResponse,
     stream: NodeJS.WritableStream
@@ -64,7 +81,21 @@ async function pipeResponseToStream(
     });
 }
 
-export async function saveCache(stream: NodeJS.ReadableStream, key: string) {
+export async function downloadCache(
+    cacheEntry: ArtifactCacheEntry,
+    archivePath: string
+): Promise<void> {
+    const stream = fs.createWriteStream(archivePath);
+    const httpClient = new HttpClient("actions/cache");
+    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+    const downloadResponse = await httpClient.get(cacheEntry.archiveLocation!);
+    await pipeResponseToStream(downloadResponse, stream);
+}
+
+export async function saveCache(
+    stream: NodeJS.ReadableStream,
+    key: string
+): Promise<void> {
     const cacheUrl = getCacheUrl();
     const token = process.env["ACTIONS_RUNTIME_TOKEN"] || "";
     const bearerCredentialHandler = new BearerCredentialHandler(token);
@@ -93,32 +124,3 @@ export async function saveCache(stream: NodeJS.ReadableStream, key: string) {
 
     core.info("Cache saved successfully");
 }
-
-function getRequestOptions(): IRequestOptions {
-    const requestOptions: IRequestOptions = {
-        acceptHeader: createAcceptHeader("application/json", "5.2-preview.1")
-    };
-
-    return requestOptions;
-}
-
-function createAcceptHeader(type: string, apiVersion: string): string {
-    return `${type};api-version=${apiVersion}`;
-}
-
-function getCacheUrl(): string {
-    // Ideally we just use ACTIONS_CACHE_URL
-    let cacheUrl: string = (
-        process.env["ACTIONS_CACHE_URL"] ||
-        process.env["ACTIONS_RUNTIME_URL"] ||
-        ""
-    ).replace("pipelines", "artifactcache");
-    if (!cacheUrl) {
-        throw new Error(
-            "Cache Service Url not found, unable to restore cache."
-        );
-    }
-
-    core.debug(`Cache Url: ${cacheUrl}`);
-    return cacheUrl;
-}

src/constants.ts

@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-namespace */
 export namespace Inputs {
     export const Key = "key";
     export const Path = "path";

src/restore.ts

@@ -1,14 +1,12 @@
 import * as core from "@actions/core";
 import { exec } from "@actions/exec";
 import * as io from "@actions/io";
-
 import * as path from "path";
-
 import * as cacheHttpClient from "./cacheHttpClient";
 import { Inputs, State } from "./constants";
 import * as utils from "./utils/actionUtils";
 
-async function run() {
+async function run(): Promise<void> {
     try {
         // Validate inputs, this can cause task failure
         let cachePath = utils.resolvePath(

src/save.ts

@@ -1,15 +1,13 @@
 import * as core from "@actions/core";
 import { exec } from "@actions/exec";
-
 import * as io from "@actions/io";
 import * as fs from "fs";
 import * as path from "path";
-
 import * as cacheHttpClient from "./cacheHttpClient";
 import { Inputs, State } from "./constants";
 import * as utils from "./utils/actionUtils";
 
-async function run() {
+async function run(): Promise<void> {
     try {
         const state = utils.getCacheState();
 

src/utils/actionUtils.ts

@@ -4,7 +4,6 @@ import * as fs from "fs";
 import * as os from "os";
 import * as path from "path";
 import * as uuidV4 from "uuid/v4";
-
 import { Outputs, State } from "../constants";
 import { ArtifactCacheEntry } from "../contracts";
 
@@ -50,10 +49,18 @@ export function isExactKeyMatch(
     );
 }
 
+export function setCacheState(state: ArtifactCacheEntry): void {
+    core.saveState(State.CacheResult, JSON.stringify(state));
+}
+
+export function setCacheHitOutput(isCacheHit: boolean): void {
+    core.setOutput(Outputs.CacheHit, isCacheHit.toString());
+}
+
 export function setOutputAndState(
     key: string,
     cacheResult?: ArtifactCacheEntry
-) {
+): void {
     setCacheHitOutput(isExactKeyMatch(key, cacheResult));
     // Store the cache result if it exists
     cacheResult && setCacheState(cacheResult);
@@ -65,14 +72,6 @@ export function getCacheState(): ArtifactCacheEntry | undefined {
     return (stateData && JSON.parse(stateData)) as ArtifactCacheEntry;
 }
 
-export function setCacheState(state: ArtifactCacheEntry) {
-    core.saveState(State.CacheResult, JSON.stringify(state));
-}
-
-export function setCacheHitOutput(isCacheHit: boolean) {
-    core.setOutput(Outputs.CacheHit, isCacheHit.toString());
-}
-
 export function resolvePath(filePath: string): string {
     if (filePath[0] === "~") {
         const home = os.homedir();

src/utils/testUtils.ts

@@ -5,7 +5,7 @@ function getInputName(name: string): string {
     return `INPUT_${name.replace(/ /g, "_").toUpperCase()}`;
 }
 
-export function setInput(name: string, value: string) {
+export function setInput(name: string, value: string): void {
     process.env[getInputName(name)] = value;
 }
 
@@ -15,14 +15,14 @@ interface CacheInput {
     restoreKeys?: string[];
 }
 
-export function setInputs(input: CacheInput) {
+export function setInputs(input: CacheInput): void {
     setInput(Inputs.Path, input.path);
     setInput(Inputs.Key, input.key);
     input.restoreKeys &&
         setInput(Inputs.RestoreKeys, input.restoreKeys.join("\n"));
 }
 
-export function clearInputs() {
+export function clearInputs(): void {
     delete process.env[getInputName(Inputs.Path)];
     delete process.env[getInputName(Inputs.Key)];
     delete process.env[getInputName(Inputs.RestoreKeys)];