Add and configure ESLint and update configuration for Prettier (#703)

* Add ESLinter and update Prettier * Update eslint config * Update dependencies * Rebuild action * Update package.json * Updates docs * Update docs
2 years ago · 962678f22c
parent 7c29869aec
commit 962678f22c
31 changed files with 3949 additions and 1690 deletions
--- a/.eslintignore
+++ b/.eslintignore
@ -0,0 +1,6 @@
+# Ignore list
+/*
+
+# Do not ignore these folders:
+!__tests__/
+!src/
--- a/.eslintrc.js
+++ b/.eslintrc.js
@ -0,0 +1,49 @@
+module.exports = {
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/recommended',
+    'plugin:eslint-plugin-jest/recommended',
+    'eslint-config-prettier'
+  ],
+  parser: '@typescript-eslint/parser',
+  plugins: ['@typescript-eslint', 'eslint-plugin-jest'],
+  rules: {
+    '@typescript-eslint/no-require-imports': 'error',
+    '@typescript-eslint/no-non-null-assertion': 'off',
+    '@typescript-eslint/no-explicit-any': 'off',
+    '@typescript-eslint/no-empty-function': 'off',
+    '@typescript-eslint/ban-ts-comment': [
+      'error',
+      {
+        'ts-ignore': 'allow-with-description'
+      }
+    ],
+    'no-console': 'error',
+    'yoda': 'error',
+    'prefer-const': [
+      'error',
+      {
+        destructuring: 'all'
+      }
+    ],
+    'no-control-regex': 'off',
+    'no-constant-condition': ['error', {checkLoops: false}]
+  },
+  overrides: [
+    {
+      files: ['**/*{test,spec}.ts'],
+      rules: {
+        '@typescript-eslint/no-unused-vars': 'off',
+        'jest/no-standalone-expect': 'off',
+        'jest/no-conditional-expect': 'off',
+        'no-console': 'off',
+
+      }
+    }
+  ],
+  env: {
+    node: true,
+    es6: true,
+    'jest/globals': true
+  }
+};
--- a/.gitattributes
+++ b/.gitattributes
@ -1 +1,2 @@
+* text=auto eol=lf
 .licenses/** -diff linguist-generated=true
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@ -2,9 +2,9 @@ name: CodeQL analysis

 on:
  push:
-    branches: [ main ]
+    branches: [main]
  pull_request:
-    branches: [ main ]
+    branches: [main]
  schedule:
    - cron: '0 3 * * 0'

--- a/.github/workflows/release-new-action-version.yml
+++ b/.github/workflows/release-new-action-version.yml
@ -21,8 +21,8 @@ jobs:
      name: releaseNewActionVersion
    runs-on: ubuntu-latest
    steps:
-    - name: Update the ${{ env.TAG_NAME }} tag
-      uses: actions/publish-action@v0.2.2
-      with:
-        source-tag: ${{ env.TAG_NAME }}
-        slack-webhook: ${{ secrets.SLACK_WEBHOOK }}
+      - name: Update the ${{ env.TAG_NAME }} tag
+        uses: actions/publish-action@v0.2.2
+        with:
+          source-tag: ${{ env.TAG_NAME }}
+          slack-webhook: ${{ secrets.SLACK_WEBHOOK }}
--- a/.github/workflows/versions.yml
+++ b/.github/workflows/versions.yml
@ -57,7 +57,12 @@ jobs:
      fail-fast: false
      matrix:
        os: [ubuntu-latest, windows-latest, macos-latest]
-        node-version: ['20-v8-canary', '20.0.0-v8-canary','20.0.0-v8-canary20221103f7e2421e91']
+        node-version:
+          [
+            '20-v8-canary',
+            '20.0.0-v8-canary',
+            '20.0.0-v8-canary20221103f7e2421e91'
+          ]
    steps:
      - uses: actions/checkout@v3
      - name: Setup Node
@ -77,7 +82,8 @@ jobs:
      fail-fast: false
      matrix:
        os: [ubuntu-latest, windows-latest, macos-latest]
-        node-version: [16.0.0-nightly20210420a0261d231c, 17-nightly, 18.0.0-nightly]
+        node-version:
+          [16.0.0-nightly20210420a0261d231c, 17-nightly, 18.0.0-nightly]
    steps:
      - uses: actions/checkout@v3
      - name: Setup Node
@ -170,7 +176,7 @@ jobs:
    strategy:
      fail-fast: false
      matrix:
-        os: [ ubuntu-latest, windows-latest, macos-latest ]
+        os: [ubuntu-latest, windows-latest, macos-latest]
    steps:
      - uses: actions/checkout@v3
      - name: Setup node from node version file
--- a/.prettierignore
+++ b/.prettierignore
@ -0,0 +1,7 @@
+# Ignore list
+/*
+
+# Do not ignore these folders:
+!__tests__/
+!.github/
+!src/
--- a/.prettierrc.js
+++ b/.prettierrc.js
@ -0,0 +1,10 @@
+module.exports = {
+  printWidth: 80,
+  tabWidth: 2,
+  useTabs: false,
+  semi: true,
+  singleQuote: true,
+  trailingComma: 'none',
+  bracketSpacing: false,
+  arrowParens: 'avoid'
+};
--- a/.prettierrc.json
+++ b/.prettierrc.json
@ -1,11 +0,0 @@
-{
-    "printWidth": 80,
-    "tabWidth": 2,
-    "useTabs": false,
-    "semi": true,
-    "singleQuote": true,
-    "trailingComma": "none",
-    "bracketSpacing": false,
-    "arrowParens": "avoid",
-    "parser": "typescript"
-  }
--- a/tests/authutil.test.ts
+++ b/tests/authutil.test.ts
@ -15,11 +15,7 @@ describe('authutil tests', () => {
  let dbgSpy: jest.SpyInstance;

  beforeAll(async () => {
-    const randPath = path.join(
-      Math.random()
-        .toString(36)
-        .substring(7)
-    );
+    const randPath = path.join(Math.random().toString(36).substring(7));
    console.log('::stop-commands::stoptoken'); // Disable executing of runner commands when running tests in actions
    process.env['GITHUB_ENV'] = ''; // Stub out Environment file functionality so we can verify it writes to standard out (toolkit is backwards compatible)
    const tempDir = path.join(_runnerDir, randPath, 'temp');
@ -67,10 +63,10 @@ describe('authutil tests', () => {
  }, 100000);

  function readRcFile(rcFile: string) {
-    let rc = {};
-    let contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
+    const rc = {};
+    const contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
    for (const line of contents.split(os.EOL)) {
-      let parts = line.split('=');
+      const parts = line.split('=');
      if (parts.length == 2) {
        rc[parts[0].trim()] = parts[1].trim();
      }
@ -82,8 +78,8 @@ describe('authutil tests', () => {
    await auth.configAuthentication('https://registry.npmjs.org/', 'false');

    expect(fs.statSync(rcFile)).toBeDefined();
-    let contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
-    let rc = readRcFile(rcFile);
+    const contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
+    const rc = readRcFile(rcFile);
    expect(rc['registry']).toBe('https://registry.npmjs.org/');
    expect(rc['always-auth']).toBe('false');
  });
@ -92,7 +88,7 @@ describe('authutil tests', () => {
    await auth.configAuthentication('https://registry.npmjs.org', 'false');

    expect(fs.statSync(rcFile)).toBeDefined();
-    let rc = readRcFile(rcFile);
+    const rc = readRcFile(rcFile);
    expect(rc['registry']).toBe('https://registry.npmjs.org/');
    expect(rc['always-auth']).toBe('false');
  });
@ -102,7 +98,7 @@ describe('authutil tests', () => {
    await auth.configAuthentication('https://registry.npmjs.org', 'false');

    expect(fs.statSync(rcFile)).toBeDefined();
-    let rc = readRcFile(rcFile);
+    const rc = readRcFile(rcFile);
    expect(rc['@myscope:registry']).toBe('https://registry.npmjs.org/');
    expect(rc['always-auth']).toBe('false');
  });
@ -111,7 +107,7 @@ describe('authutil tests', () => {
    await auth.configAuthentication('npm.pkg.github.com', 'false');

    expect(fs.statSync(rcFile)).toBeDefined();
-    let rc = readRcFile(rcFile);
+    const rc = readRcFile(rcFile);
    expect(rc['@ownername:registry']).toBe('npm.pkg.github.com/');
    expect(rc['always-auth']).toBe('false');
  });
@ -119,16 +115,16 @@ describe('authutil tests', () => {
  it('Sets up npmrc for always-auth true', async () => {
    await auth.configAuthentication('https://registry.npmjs.org/', 'true');
    expect(fs.statSync(rcFile)).toBeDefined();
-    let rc = readRcFile(rcFile);
+    const rc = readRcFile(rcFile);
    expect(rc['registry']).toBe('https://registry.npmjs.org/');
    expect(rc['always-auth']).toBe('true');
  });

-  it('It is already set the NODE_AUTH_TOKEN export it ', async () => {
+  it('is already set the NODE_AUTH_TOKEN export it', async () => {
    process.env.NODE_AUTH_TOKEN = 'foobar';
    await auth.configAuthentication('npm.pkg.github.com', 'false');
    expect(fs.statSync(rcFile)).toBeDefined();
-    let rc = readRcFile(rcFile);
+    const rc = readRcFile(rcFile);
    expect(rc['@ownername:registry']).toBe('npm.pkg.github.com/');
    expect(rc['always-auth']).toBe('false');
    expect(process.env.NODE_AUTH_TOKEN).toEqual('foobar');
@ -137,7 +133,7 @@ describe('authutil tests', () => {
  it('configAuthentication should overwrite non-scoped with non-scoped', async () => {
    fs.writeFileSync(rcFile, 'registry=NNN');
    await auth.configAuthentication('https://registry.npmjs.org/', 'true');
-    let contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
+    const contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
    expect(contents).toBe(
      `//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}registry=https://registry.npmjs.org/${os.EOL}always-auth=true`
    );
@ -146,7 +142,7 @@ describe('authutil tests', () => {
  it('configAuthentication should overwrite only non-scoped', async () => {
    fs.writeFileSync(rcFile, `registry=NNN${os.EOL}@myscope:registry=MMM`);
    await auth.configAuthentication('https://registry.npmjs.org/', 'true');
-    let contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
+    const contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
    expect(contents).toBe(
      `@myscope:registry=MMM${os.EOL}//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}registry=https://registry.npmjs.org/${os.EOL}always-auth=true`
    );
@ -155,7 +151,7 @@ describe('authutil tests', () => {
  it('configAuthentication should add non-scoped to scoped', async () => {
    fs.writeFileSync(rcFile, '@myscope:registry=NNN');
    await auth.configAuthentication('https://registry.npmjs.org/', 'true');
-    let contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
+    const contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
    expect(contents).toBe(
      `@myscope:registry=NNN${os.EOL}//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}registry=https://registry.npmjs.org/${os.EOL}always-auth=true`
    );
@ -165,7 +161,7 @@ describe('authutil tests', () => {
    process.env['INPUT_SCOPE'] = 'myscope';
    fs.writeFileSync(rcFile, `@myscope:registry=NNN`);
    await auth.configAuthentication('https://registry.npmjs.org/', 'true');
-    let contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
+    const contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
    expect(contents).toBe(
      `//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}@myscope:registry=https://registry.npmjs.org/${os.EOL}always-auth=true`
    );
@ -175,7 +171,7 @@ describe('authutil tests', () => {
    process.env['INPUT_SCOPE'] = 'myscope';
    fs.writeFileSync(rcFile, `registry=NNN${os.EOL}@myscope:registry=MMM`);
    await auth.configAuthentication('https://registry.npmjs.org/', 'true');
-    let contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
+    const contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
    expect(contents).toBe(
      `registry=NNN${os.EOL}//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}@myscope:registry=https://registry.npmjs.org/${os.EOL}always-auth=true`
    );
@ -185,7 +181,7 @@ describe('authutil tests', () => {
    process.env['INPUT_SCOPE'] = 'myscope';
    fs.writeFileSync(rcFile, `registry=MMM`);
    await auth.configAuthentication('https://registry.npmjs.org/', 'true');
-    let contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
+    const contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
    expect(contents).toBe(
      `registry=MMM${os.EOL}//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}@myscope:registry=https://registry.npmjs.org/${os.EOL}always-auth=true`
    );
@ -198,7 +194,7 @@ describe('authutil tests', () => {
      `@otherscope:registry=NNN${os.EOL}@myscope:registry=MMM`
    );
    await auth.configAuthentication('https://registry.npmjs.org/', 'true');
-    let contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
+    const contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
    expect(contents).toBe(
      `@otherscope:registry=NNN${os.EOL}//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}@myscope:registry=https://registry.npmjs.org/${os.EOL}always-auth=true`
    );
@ -208,7 +204,7 @@ describe('authutil tests', () => {
    process.env['INPUT_SCOPE'] = 'myscope';
    fs.writeFileSync(rcFile, `@otherscope:registry=MMM`);
    await auth.configAuthentication('https://registry.npmjs.org/', 'true');
-    let contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
+    const contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
    expect(contents).toBe(
      `@otherscope:registry=MMM${os.EOL}//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}@myscope:registry=https://registry.npmjs.org/${os.EOL}always-auth=true`
    );
--- a/tests/cache-restore.test.ts
+++ b/tests/cache-restore.test.ts
@ -108,7 +108,7 @@ describe('cache-restore', () => {
    it.each([['npm7'], ['npm6'], ['pnpm6'], ['yarn1'], ['yarn2'], ['random']])(
      'Throw an error because %s is not supported',
      async packageManager => {
-        await expect(restoreCache(packageManager)).rejects.toThrowError(
+        await expect(restoreCache(packageManager)).rejects.toThrow(
          `Caching for '${packageManager}' is not supported`
        );
      }
--- a/tests/cache-save.test.ts
+++ b/tests/cache-save.test.ts
@ -18,7 +18,7 @@ describe('run', () => {
  const commonPath = '/some/random/path';
  process.env['GITHUB_WORKSPACE'] = path.join(__dirname, 'data');

-  let inputs = {} as any;
+  const inputs = {} as any;

  let getInputSpy: jest.SpyInstance;
  let infoSpy: jest.SpyInstance;
--- a/tests/canary-installer.test.ts
+++ b/tests/canary-installer.test.ts
@ -12,11 +12,11 @@ import * as main from '../src/main';
 import * as auth from '../src/authutil';
 import {INodeVersion} from '../src/distributions/base-models';

-const nodeTestManifest = require('./data/versions-manifest.json');
-const nodeTestDist = require('./data/node-dist-index.json');
-const nodeTestDistNightly = require('./data/node-nightly-index.json');
-const nodeTestDistRc = require('./data/node-rc-index.json');
-const nodeV8CanaryTestDist = require('./data/v8-canary-dist-index.json');
+import nodeTestManifest from './data/versions-manifest.json';
+import nodeTestDist from './data/node-dist-index.json';
+import nodeTestDistNightly from './data/node-nightly-index.json';
+import nodeTestDistRc from './data/node-rc-index.json';
+import nodeV8CanaryTestDist from './data/v8-canary-dist-index.json';

 describe('setup-node', () => {
  let inputs = {} as any;
@ -95,13 +95,13 @@ describe('setup-node', () => {
    getJsonSpy.mockImplementation(url => {
      let res: any;
      if (url.includes('/rc')) {
-        res = <INodeVersion>nodeTestDistRc;
+        res = <INodeVersion[]>nodeTestDistRc;
      } else if (url.includes('/nightly')) {
-        res = <INodeVersion>nodeTestDistNightly;
+        res = <INodeVersion[]>nodeTestDistNightly;
      } else if (url.includes('/v8-canary')) {
-        res = <INodeVersion>nodeV8CanaryTestDist;
+        res = <INodeVersion[]>nodeV8CanaryTestDist;
      } else {
-        res = <INodeVersion>nodeTestDist;
+        res = <INodeVersion[]>nodeTestDist;
      }

      return {result: res};
@ -154,7 +154,7 @@ describe('setup-node', () => {
    os['arch'] = 'x64';
    inputs.stable = 'true';

-    let toolPath = path.normalize(
+    const toolPath = path.normalize(
      '/cache/node/20.0.0-v8-canary20221103f7e2421e91/x64'
    );
    findSpy.mockImplementation(() => toolPath);
@ -180,7 +180,7 @@ describe('setup-node', () => {

    inSpy.mockImplementation(name => inputs[name]);

-    let toolPath = path.normalize(
+    const toolPath = path.normalize(
      '/cache/node/20.0.0-v8-canary20221103f7e2421e91/x64'
    );
    findSpy.mockImplementation(() => toolPath);
@ -192,13 +192,13 @@ describe('setup-node', () => {
    ]);
    await main.run();

-    let expPath = path.join(toolPath, 'bin');
+    const expPath = path.join(toolPath, 'bin');
    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
  });

  it('handles unhandled find error and reports error', async () => {
    os.platform = 'linux';
-    let errMsg = 'unhandled error message';
+    const errMsg = 'unhandled error message';
    inputs['node-version'] = '20.0.0-v8-canary20221103f7e2421e91';

    findSpy.mockImplementation(() => {
@ -224,7 +224,7 @@ describe('setup-node', () => {
    os.arch = 'x64';

    // a version which is not in the manifest but is in node dist
-    let versionSpec = '11.15.0';
+    const versionSpec = '11.15.0';

    inputs['node-version'] = versionSpec;
    inputs['always-auth'] = false;
@ -234,13 +234,13 @@ describe('setup-node', () => {
    findSpy.mockImplementation(() => '');

    dlSpy.mockImplementation(async () => '/some/temp/path');
-    let toolPath = path.normalize('/cache/node/11.11.0/x64');
+    const toolPath = path.normalize('/cache/node/11.11.0/x64');
    exSpy.mockImplementation(async () => '/some/other/temp/path');
    cacheSpy.mockImplementation(async () => toolPath);

    await main.run();

-    let expPath = path.join(toolPath, 'bin');
+    const expPath = path.join(toolPath, 'bin');

    expect(dlSpy).toHaveBeenCalled();
    expect(exSpy).toHaveBeenCalled();
@ -257,7 +257,7 @@ describe('setup-node', () => {
    os.platform = 'linux';
    os.arch = 'x64';

-    let versionSpec = '23.0.0-v8-canary20221103f7e2421e91';
+    const versionSpec = '23.0.0-v8-canary20221103f7e2421e91';
    inputs['node-version'] = versionSpec;

    findSpy.mockImplementation(() => '');
@ -275,12 +275,12 @@ describe('setup-node', () => {
  });

  it('reports a failed download', async () => {
-    let errMsg = 'unhandled download message';
+    const errMsg = 'unhandled download message';
    os.platform = 'linux';
    os.arch = 'x64';

    // a version which is in the manifest
-    let versionSpec = '19.0.0-v8-canary';
+    const versionSpec = '19.0.0-v8-canary';

    inputs['node-version'] = versionSpec;
    inputs['always-auth'] = false;
@ -327,14 +327,14 @@ describe('setup-node', () => {
      inputs['always-auth'] = false;
      inputs['token'] = 'faketoken';

-      let expectedUrl = `https://nodejs.org/download/v8-canary/v${version}/node-v${version}-${platform}-${arch}.${fileExtension}`;
+      const expectedUrl = `https://nodejs.org/download/v8-canary/v${version}/node-v${version}-${platform}-${arch}.${fileExtension}`;

      // ... but not in the local cache
      findSpy.mockImplementation(() => '');
      findAllVersionsSpy.mockImplementation(() => []);

      dlSpy.mockImplementation(async () => '/some/temp/path');
-      let toolPath = path.normalize(`/cache/node/${version}/${arch}`);
+      const toolPath = path.normalize(`/cache/node/${version}/${arch}`);
      exSpy.mockImplementation(async () => '/some/other/temp/path');
      cacheSpy.mockImplementation(async () => toolPath);

@ -502,7 +502,7 @@ describe('setup-node', () => {

  describe('setup-node v8 canary tests', () => {
    it('v8 canary setup node flow with cached', async () => {
-      let versionSpec = 'v20-v8-canary';
+      const versionSpec = 'v20-v8-canary';

      inputs['node-version'] = versionSpec;
      inputs['always-auth'] = false;
--- a/tests/data/pnpm-lock.yaml
+++ b/tests/data/pnpm-lock.yaml
@ -7,9 +7,11 @@ dependencies:
  express: 4.17.1

 packages:
-
  /accepts/1.3.7:
-    resolution: {integrity: sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==}
+    resolution:
+      {
+        integrity: sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==
+      }
    engines: {node: '>= 0.6'}
    dependencies:
      mime-types: 2.1.31
@ -21,7 +23,10 @@ packages:
    dev: false

  /body-parser/1.19.0:
-    resolution: {integrity: sha512-dhEPs72UPbDnAQJ9ZKMNTP6ptJaionhP5cBb541nXPlW60Jepo9RV/a4fX4XWW9CuFNK22krhrj1+rgzifNCsw==}
+    resolution:
+      {
+        integrity: sha512-dhEPs72UPbDnAQJ9ZKMNTP6ptJaionhP5cBb541nXPlW60Jepo9RV/a4fX4XWW9CuFNK22krhrj1+rgzifNCsw==
+      }
    engines: {node: '>= 0.8'}
    dependencies:
      bytes: 3.1.0
@ -37,19 +42,28 @@ packages:
    dev: false

  /bytes/3.1.0:
-    resolution: {integrity: sha512-zauLjrfCG+xvoyaqLoV8bLVXXNGC4JqlxFCutSDWA6fJrTo2ZuvLYTqZ7aHBLZSMOopbzwv8f+wZcVzfVTI2Dg==}
+    resolution:
+      {
+        integrity: sha512-zauLjrfCG+xvoyaqLoV8bLVXXNGC4JqlxFCutSDWA6fJrTo2ZuvLYTqZ7aHBLZSMOopbzwv8f+wZcVzfVTI2Dg==
+      }
    engines: {node: '>= 0.8'}
    dev: false

  /content-disposition/0.5.3:
-    resolution: {integrity: sha512-ExO0774ikEObIAEV9kDo50o+79VCUdEB6n6lzKgGwupcVeRlhrj3qGAfwq8G6uBJjkqLrhT0qEYFcWng8z1z0g==}
+    resolution:
+      {
+        integrity: sha512-ExO0774ikEObIAEV9kDo50o+79VCUdEB6n6lzKgGwupcVeRlhrj3qGAfwq8G6uBJjkqLrhT0qEYFcWng8z1z0g==
+      }
    engines: {node: '>= 0.6'}
    dependencies:
      safe-buffer: 5.1.2
    dev: false

  /content-type/1.0.4:
-    resolution: {integrity: sha512-hIP3EEPs8tB9AT1L+NUqtwOAps4mk2Zob89MWXMHjHWg9milF/j4osnnQLXBCBFBk/tvIG/tUc9mOUJiPBhPXA==}
+    resolution:
+      {
+        integrity: sha512-hIP3EEPs8tB9AT1L+NUqtwOAps4mk2Zob89MWXMHjHWg9milF/j4osnnQLXBCBFBk/tvIG/tUc9mOUJiPBhPXA==
+      }
    engines: {node: '>= 0.6'}
    dev: false

@ -58,12 +72,18 @@ packages:
    dev: false

  /cookie/0.4.0:
-    resolution: {integrity: sha512-+Hp8fLp57wnUSt0tY0tHEXh4voZRDnoIrZPqlo3DPiI4y9lwg/jqx+1Om94/W6ZaPDOUbnjOt/99w66zk+l1Xg==}
+    resolution:
+      {
+        integrity: sha512-+Hp8fLp57wnUSt0tY0tHEXh4voZRDnoIrZPqlo3DPiI4y9lwg/jqx+1Om94/W6ZaPDOUbnjOt/99w66zk+l1Xg==
+      }
    engines: {node: '>= 0.6'}
    dev: false

  /debug/2.6.9:
-    resolution: {integrity: sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==}
+    resolution:
+      {
+        integrity: sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==
+      }
    dependencies:
      ms: 2.0.0
    dev: false
@ -96,7 +116,10 @@ packages:
    dev: false

  /express/4.17.1:
-    resolution: {integrity: sha512-mHJ9O79RqluphRrcw2X/GTh3k9tVv8YcoyY4Kkh4WDMUYKRZUq0h1o0w2rrrxBqM7VoeUVqgb27xlEMXTnYt4g==}
+    resolution:
+      {
+        integrity: sha512-mHJ9O79RqluphRrcw2X/GTh3k9tVv8YcoyY4Kkh4WDMUYKRZUq0h1o0w2rrrxBqM7VoeUVqgb27xlEMXTnYt4g==
+      }
    engines: {node: '>= 0.10.0'}
    dependencies:
      accepts: 1.3.7
@ -132,7 +155,10 @@ packages:
    dev: false

  /finalhandler/1.1.2:
-    resolution: {integrity: sha512-aAWcW57uxVNrQZqFXjITpW3sIUQmHGG3qSb9mUah9MgMC4NeWhNOlNjXEYq3HjRAvL6arUviZGGJsBg6z0zsWA==}
+    resolution:
+      {
+        integrity: sha512-aAWcW57uxVNrQZqFXjITpW3sIUQmHGG3qSb9mUah9MgMC4NeWhNOlNjXEYq3HjRAvL6arUviZGGJsBg6z0zsWA==
+      }
    engines: {node: '>= 0.8'}
    dependencies:
      debug: 2.6.9
@ -145,7 +171,10 @@ packages:
    dev: false

  /forwarded/0.2.0:
-    resolution: {integrity: sha512-buRG0fpBtRHSTCOASe6hD258tEubFoRLb4ZNA6NxMVHNw2gOcwHo9wyablzMzOA5z9xA9L1KNjk/Nt6MT9aYow==}
+    resolution:
+      {
+        integrity: sha512-buRG0fpBtRHSTCOASe6hD258tEubFoRLb4ZNA6NxMVHNw2gOcwHo9wyablzMzOA5z9xA9L1KNjk/Nt6MT9aYow==
+      }
    engines: {node: '>= 0.6'}
    dev: false

@ -155,7 +184,10 @@ packages:
    dev: false

  /http-errors/1.7.2:
-    resolution: {integrity: sha512-uUQBt3H/cSIVfch6i1EuPNy/YsRSOUBXTVfZ+yR7Zjez3qjBz6i9+i4zjNaoqcoFVI4lQJ5plg63TvGfRSDCRg==}
+    resolution:
+      {
+        integrity: sha512-uUQBt3H/cSIVfch6i1EuPNy/YsRSOUBXTVfZ+yR7Zjez3qjBz6i9+i4zjNaoqcoFVI4lQJ5plg63TvGfRSDCRg==
+      }
    engines: {node: '>= 0.6'}
    dependencies:
      depd: 1.1.2
@ -166,7 +198,10 @@ packages:
    dev: false

  /http-errors/1.7.3:
-    resolution: {integrity: sha512-ZTTX0MWrsQ2ZAhA1cejAwDLycFsd7I7nVtnkT3Ol0aqodaKW+0CTZDQ1uBv5whptCnc8e8HeRRJxRs0kmm/Qfw==}
+    resolution:
+      {
+        integrity: sha512-ZTTX0MWrsQ2ZAhA1cejAwDLycFsd7I7nVtnkT3Ol0aqodaKW+0CTZDQ1uBv5whptCnc8e8HeRRJxRs0kmm/Qfw==
+      }
    engines: {node: '>= 0.6'}
    dependencies:
      depd: 1.1.2
@ -177,7 +212,10 @@ packages:
    dev: false

  /iconv-lite/0.4.24:
-    resolution: {integrity: sha512-v3MXnZAcvnywkTUEZomIActle7RXXeedOR31wwl7VlyoXO4Qi9arvSenNQWne1TcRwhCL1HwLI21bEqdpj8/rA==}
+    resolution:
+      {
+        integrity: sha512-v3MXnZAcvnywkTUEZomIActle7RXXeedOR31wwl7VlyoXO4Qi9arvSenNQWne1TcRwhCL1HwLI21bEqdpj8/rA==
+      }
    engines: {node: '>=0.10.0'}
    dependencies:
      safer-buffer: 2.1.2
@ -188,11 +226,17 @@ packages:
    dev: false

  /inherits/2.0.4:
-    resolution: {integrity: sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==}
+    resolution:
+      {
+        integrity: sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==
+      }
    dev: false

  /ipaddr.js/1.9.1:
-    resolution: {integrity: sha512-0KI/607xoxSToH7GjN1FfSbLoU0+btTicjsQSWQlh/hZykN8KpmMf7uYwPW3R+akZ6R/w18ZlXSHBYXiYUPO3g==}
+    resolution:
+      {
+        integrity: sha512-0KI/607xoxSToH7GjN1FfSbLoU0+btTicjsQSWQlh/hZykN8KpmMf7uYwPW3R+akZ6R/w18ZlXSHBYXiYUPO3g==
+      }
    engines: {node: '>= 0.10'}
    dev: false

@ -211,19 +255,28 @@ packages:
    dev: false

  /mime-db/1.48.0:
-    resolution: {integrity: sha512-FM3QwxV+TnZYQ2aRqhlKBMHxk10lTbMt3bBkMAp54ddrNeVSfcQYOOKuGuy3Ddrm38I04If834fOUSq1yzslJQ==}
+    resolution:
+      {
+        integrity: sha512-FM3QwxV+TnZYQ2aRqhlKBMHxk10lTbMt3bBkMAp54ddrNeVSfcQYOOKuGuy3Ddrm38I04If834fOUSq1yzslJQ==
+      }
    engines: {node: '>= 0.6'}
    dev: false

  /mime-types/2.1.31:
-    resolution: {integrity: sha512-XGZnNzm3QvgKxa8dpzyhFTHmpP3l5YNusmne07VUOXxou9CqUqYa/HBy124RqtVh/O2pECas/MOcsDgpilPOPg==}
+    resolution:
+      {
+        integrity: sha512-XGZnNzm3QvgKxa8dpzyhFTHmpP3l5YNusmne07VUOXxou9CqUqYa/HBy124RqtVh/O2pECas/MOcsDgpilPOPg==
+      }
    engines: {node: '>= 0.6'}
    dependencies:
      mime-db: 1.48.0
    dev: false

  /mime/1.6.0:
-    resolution: {integrity: sha512-x0Vn8spI+wuJ1O6S7gnbaQg8Pxh4NNHb7KSINmEWKiPE4RKOplvijn+NkmYmmRgP68mc70j2EbeTFRsrswaQeg==}
+    resolution:
+      {
+        integrity: sha512-x0Vn8spI+wuJ1O6S7gnbaQg8Pxh4NNHb7KSINmEWKiPE4RKOplvijn+NkmYmmRgP68mc70j2EbeTFRsrswaQeg==
+      }
    engines: {node: '>=4'}
    hasBin: true
    dev: false
@ -233,11 +286,17 @@ packages:
    dev: false

  /ms/2.1.1:
-    resolution: {integrity: sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg==}
+    resolution:
+      {
+        integrity: sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg==
+      }
    dev: false

  /negotiator/0.6.2:
-    resolution: {integrity: sha512-hZXc7K2e+PgeI1eDBe/10Ard4ekbfrrqG8Ep+8Jmf4JID2bNg7NvCPOZN+kfF574pFQI7mum2AUqDidoKqcTOw==}
+    resolution:
+      {
+        integrity: sha512-hZXc7K2e+PgeI1eDBe/10Ard4ekbfrrqG8Ep+8Jmf4JID2bNg7NvCPOZN+kfF574pFQI7mum2AUqDidoKqcTOw==
+      }
    engines: {node: '>= 0.6'}
    dev: false

@ -249,7 +308,10 @@ packages:
    dev: false

  /parseurl/1.3.3:
-    resolution: {integrity: sha512-CiyeOxFT/JZyN5m0z9PfXw4SCBJ6Sygz1Dpl0wqjlhDEGGBP1GnsUVEL0p63hoG1fcj3fHynXi9NYO4nWOL+qQ==}
+    resolution:
+      {
+        integrity: sha512-CiyeOxFT/JZyN5m0z9PfXw4SCBJ6Sygz1Dpl0wqjlhDEGGBP1GnsUVEL0p63hoG1fcj3fHynXi9NYO4nWOL+qQ==
+      }
    engines: {node: '>= 0.8'}
    dev: false

@ -258,7 +320,10 @@ packages:
    dev: false

  /proxy-addr/2.0.7:
-    resolution: {integrity: sha512-llQsMLSUDUPT44jdrU/O37qlnifitDP+ZwrmmZcoSKyLKvtZxpyV0n2/bD/N4tBAAZ/gJEdZU7KMraoK1+XYAg==}
+    resolution:
+      {
+        integrity: sha512-llQsMLSUDUPT44jdrU/O37qlnifitDP+ZwrmmZcoSKyLKvtZxpyV0n2/bD/N4tBAAZ/gJEdZU7KMraoK1+XYAg==
+      }
    engines: {node: '>= 0.10'}
    dependencies:
      forwarded: 0.2.0
@ -266,17 +331,26 @@ packages:
    dev: false

  /qs/6.7.0:
-    resolution: {integrity: sha512-VCdBRNFTX1fyE7Nb6FYoURo/SPe62QCaAyzJvUjwRaIsc+NePBEniHlvxFmmX56+HZphIGtV0XeCirBtpDrTyQ==}
+    resolution:
+      {
+        integrity: sha512-VCdBRNFTX1fyE7Nb6FYoURo/SPe62QCaAyzJvUjwRaIsc+NePBEniHlvxFmmX56+HZphIGtV0XeCirBtpDrTyQ==
+      }
    engines: {node: '>=0.6'}
    dev: false

  /range-parser/1.2.1:
-    resolution: {integrity: sha512-Hrgsx+orqoygnmhFbKaHE6c296J+HTAQXoxEF6gNupROmmGJRoyzfG3ccAveqCBrwr/2yxQ5BVd/GTl5agOwSg==}
+    resolution:
+      {
+        integrity: sha512-Hrgsx+orqoygnmhFbKaHE6c296J+HTAQXoxEF6gNupROmmGJRoyzfG3ccAveqCBrwr/2yxQ5BVd/GTl5agOwSg==
+      }
    engines: {node: '>= 0.6'}
    dev: false

  /raw-body/2.4.0:
-    resolution: {integrity: sha512-4Oz8DUIwdvoa5qMJelxipzi/iJIi40O5cGV1wNYp5hvZP8ZN0T+jiNkL0QepXs+EsQ9XJ8ipEDoiH70ySUJP3Q==}
+    resolution:
+      {
+        integrity: sha512-4Oz8DUIwdvoa5qMJelxipzi/iJIi40O5cGV1wNYp5hvZP8ZN0T+jiNkL0QepXs+EsQ9XJ8ipEDoiH70ySUJP3Q==
+      }
    engines: {node: '>= 0.8'}
    dependencies:
      bytes: 3.1.0
@ -286,15 +360,24 @@ packages:
    dev: false

  /safe-buffer/5.1.2:
-    resolution: {integrity: sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==}
+    resolution:
+      {
+        integrity: sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==
+      }
    dev: false

  /safer-buffer/2.1.2:
-    resolution: {integrity: sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==}
+    resolution:
+      {
+        integrity: sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==
+      }
    dev: false

  /send/0.17.1:
-    resolution: {integrity: sha512-BsVKsiGcQMFwT8UxypobUKyv7irCNRHk1T0G680vk88yf6LBByGcZJOTJCrTP2xVN6yI+XjPJcNuE3V4fT9sAg==}
+    resolution:
+      {
+        integrity: sha512-BsVKsiGcQMFwT8UxypobUKyv7irCNRHk1T0G680vk88yf6LBByGcZJOTJCrTP2xVN6yI+XjPJcNuE3V4fT9sAg==
+      }
    engines: {node: '>= 0.8.0'}
    dependencies:
      debug: 2.6.9
@ -313,7 +396,10 @@ packages:
    dev: false

  /serve-static/1.14.1:
-    resolution: {integrity: sha512-JMrvUwE54emCYWlTI+hGrGv5I8dEwmco/00EvkzIIsR7MqrHonbD9pO2MOfFnpFntl7ecpZs+3mW+XbQZu9QCg==}
+    resolution:
+      {
+        integrity: sha512-JMrvUwE54emCYWlTI+hGrGv5I8dEwmco/00EvkzIIsR7MqrHonbD9pO2MOfFnpFntl7ecpZs+3mW+XbQZu9QCg==
+      }
    engines: {node: '>= 0.8.0'}
    dependencies:
      encodeurl: 1.0.2
@ -323,7 +409,10 @@ packages:
    dev: false

  /setprototypeof/1.1.1:
-    resolution: {integrity: sha512-JvdAWfbXeIGaZ9cILp38HntZSFSo3mWg6xGcJJsd+d4aRMOqauag1C63dJfDw7OaMYwEbHMOxEZ1lqVRYP2OAw==}
+    resolution:
+      {
+        integrity: sha512-JvdAWfbXeIGaZ9cILp38HntZSFSo3mWg6xGcJJsd+d4aRMOqauag1C63dJfDw7OaMYwEbHMOxEZ1lqVRYP2OAw==
+      }
    dev: false

  /statuses/1.5.0:
@ -332,12 +421,18 @@ packages:
    dev: false

  /toidentifier/1.0.0:
-    resolution: {integrity: sha512-yaOH/Pk/VEhBWWTlhI+qXxDFXlejDGcQipMlyxda9nthulaxLZUNcUqFxokp0vcYnvteJln5FNQDRrxj3YcbVw==}
+    resolution:
+      {
+        integrity: sha512-yaOH/Pk/VEhBWWTlhI+qXxDFXlejDGcQipMlyxda9nthulaxLZUNcUqFxokp0vcYnvteJln5FNQDRrxj3YcbVw==
+      }
    engines: {node: '>=0.6'}
    dev: false

  /type-is/1.6.18:
-    resolution: {integrity: sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==}
+    resolution:
+      {
+        integrity: sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==
+      }
    engines: {node: '>= 0.6'}
    dependencies:
      media-typer: 0.3.0
--- a/tests/main.test.ts
+++ b/tests/main.test.ts
@ -266,7 +266,7 @@ describe('main tests', () => {

      inSpy.mockImplementation(name => inputs[name]);

-      let toolPath = path.normalize('/cache/node/12.16.1/x64');
+      const toolPath = path.normalize('/cache/node/12.16.1/x64');
      findSpy.mockImplementation(() => toolPath);

      // expect(logSpy).toHaveBeenCalledWith(`Found in cache @ ${toolPath}`);
@ -286,7 +286,7 @@ describe('main tests', () => {

      inSpy.mockImplementation(name => inputs[name]);

-      let toolPath = path.normalize('/cache/node/12.16.1/x64');
+      const toolPath = path.normalize('/cache/node/12.16.1/x64');
      findSpy.mockImplementation(() => toolPath);

      // expect(logSpy).toHaveBeenCalledWith(`Found in cache @ ${toolPath}`);
--- a/tests/nightly-installer.test.ts
+++ b/tests/nightly-installer.test.ts
@ -12,11 +12,11 @@ import * as main from '../src/main';
 import * as auth from '../src/authutil';
 import {INodeVersion} from '../src/distributions/base-models';

-const nodeTestManifest = require('./data/versions-manifest.json');
-const nodeTestDist = require('./data/node-dist-index.json');
-const nodeTestDistNightly = require('./data/node-nightly-index.json');
-const nodeTestDistRc = require('./data/node-rc-index.json');
-const nodeV8CanaryTestDist = require('./data/v8-canary-dist-index.json');
+import nodeTestManifest from './data/versions-manifest.json';
+import nodeTestDist from './data/node-dist-index.json';
+import nodeTestDistNightly from './data/node-nightly-index.json';
+import nodeTestDistRc from './data/node-rc-index.json';
+import nodeV8CanaryTestDist from './data/v8-canary-dist-index.json';

 describe('setup-node', () => {
  let inputs = {} as any;
@ -89,11 +89,11 @@ describe('setup-node', () => {
    getJsonSpy.mockImplementation(url => {
      let res: any;
      if (url.includes('/rc')) {
-        res = <INodeVersion>nodeTestDistRc;
+        res = <INodeVersion[]>nodeTestDistRc;
      } else if (url.includes('/nightly')) {
-        res = <INodeVersion>nodeTestDistNightly;
+        res = <INodeVersion[]>nodeTestDistNightly;
      } else {
-        res = <INodeVersion>nodeTestDist;
+        res = <INodeVersion[]>nodeTestDist;
      }

      return {result: res};
@ -146,7 +146,7 @@ describe('setup-node', () => {
    os['arch'] = 'x64';
    inputs.stable = 'true';

-    let toolPath = path.normalize(
+    const toolPath = path.normalize(
      '/cache/node/16.0.0-nightly20210417bc31dc0e0f/x64'
    );
    findSpy.mockImplementation(() => toolPath);
@ -172,7 +172,7 @@ describe('setup-node', () => {
    os['arch'] = 'x64';
    inputs.stable = 'false';

-    let toolPath = path.normalize(
+    const toolPath = path.normalize(
      '/cache/node/16.0.0-nightly20210415c3a5e15ebe/x64'
    );
    findSpy.mockImplementation(() => toolPath);
@ -199,7 +199,7 @@ describe('setup-node', () => {

    inSpy.mockImplementation(name => inputs[name]);

-    let toolPath = path.normalize(
+    const toolPath = path.normalize(
      '/cache/node/16.0.0-nightly20210417bc31dc0e0f/x64'
    );
    findSpy.mockImplementation(() => toolPath);
@ -218,12 +218,12 @@ describe('setup-node', () => {
      'x64'
    );

-    let expPath = path.join(toolPath, 'bin');
+    const expPath = path.join(toolPath, 'bin');
    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
  });

  it('handles unhandled find error and reports error', async () => {
-    let errMsg = 'unhandled error message';
+    const errMsg = 'unhandled error message';
    inputs['node-version'] = '16.0.0-nightly20210417bc31dc0e0f';

    findAllVersionsSpy.mockImplementation(() => [
@ -247,7 +247,7 @@ describe('setup-node', () => {
    os.arch = 'x64';

    // a version which is not in the manifest but is in node dist
-    let versionSpec = '13.13.1-nightly20200415947ddec091';
+    const versionSpec = '13.13.1-nightly20200415947ddec091';

    inputs['node-version'] = versionSpec;
    inputs['always-auth'] = false;
@ -258,7 +258,7 @@ describe('setup-node', () => {
    findAllVersionsSpy.mockImplementation(() => []);

    dlSpy.mockImplementation(async () => '/some/temp/path');
-    let toolPath = path.normalize(
+    const toolPath = path.normalize(
      '/cache/node/13.13.1-nightly20200415947ddec091/x64'
    );
    exSpy.mockImplementation(async () => '/some/other/temp/path');
@ -266,7 +266,7 @@ describe('setup-node', () => {

    await main.run();

-    let expPath = path.join(toolPath, 'bin');
+    const expPath = path.join(toolPath, 'bin');

    expect(dlSpy).toHaveBeenCalled();
    expect(exSpy).toHaveBeenCalled();
@ -277,7 +277,7 @@ describe('setup-node', () => {
    os.platform = 'linux';
    os.arch = 'x64';

-    let versionSpec = '10.13.1-nightly20200415947ddec091';
+    const versionSpec = '10.13.1-nightly20200415947ddec091';
    inputs['node-version'] = versionSpec;

    findSpy.mockImplementation(() => '');
@ -290,12 +290,12 @@ describe('setup-node', () => {
  });

  it('reports a failed download', async () => {
-    let errMsg = 'unhandled download message';
+    const errMsg = 'unhandled download message';
    os.platform = 'linux';
    os.arch = 'x64';

    // a version which is in the manifest
-    let versionSpec = '18.0.0-nightly202204180699150267';
+    const versionSpec = '18.0.0-nightly202204180699150267';

    inputs['node-version'] = versionSpec;
    inputs['always-auth'] = false;
@ -339,14 +339,14 @@ describe('setup-node', () => {
      inputs['always-auth'] = false;
      inputs['token'] = 'faketoken';

-      let expectedUrl = `https://nodejs.org/download/nightly/v${version}/node-v${version}-${platform}-${arch}.${fileExtension}`;
+      const expectedUrl = `https://nodejs.org/download/nightly/v${version}/node-v${version}-${platform}-${arch}.${fileExtension}`;

      // ... but not in the local cache
      findSpy.mockImplementation(() => '');
      findAllVersionsSpy.mockImplementation(() => []);

      dlSpy.mockImplementation(async () => '/some/temp/path');
-      let toolPath = path.normalize(`/cache/node/${version}/${arch}`);
+      const toolPath = path.normalize(`/cache/node/${version}/${arch}`);
      exSpy.mockImplementation(async () => '/some/other/temp/path');
      cacheSpy.mockImplementation(async () => toolPath);

--- a/tests/official-installer.test.ts
+++ b/tests/official-installer.test.ts
@ -13,11 +13,11 @@ import * as auth from '../src/authutil';
 import OfficialBuilds from '../src/distributions/official_builds/official_builds';
 import {INodeVersion} from '../src/distributions/base-models';

-const nodeTestManifest = require('./data/versions-manifest.json');
-const nodeTestDist = require('./data/node-dist-index.json');
-const nodeTestDistNightly = require('./data/node-nightly-index.json');
-const nodeTestDistRc = require('./data/node-rc-index.json');
-const nodeV8CanaryTestDist = require('./data/v8-canary-dist-index.json');
+import nodeTestManifest from './data/versions-manifest.json';
+import nodeTestDist from './data/node-dist-index.json';
+import nodeTestDistNightly from './data/node-nightly-index.json';
+import nodeTestDistRc from './data/node-rc-index.json';
+import nodeV8CanaryTestDist from './data/v8-canary-dist-index.json';

 describe('setup-node', () => {
  let build: OfficialBuilds;
@ -95,11 +95,11 @@ describe('setup-node', () => {
    getJsonSpy.mockImplementation(url => {
      let res: any;
      if (url.includes('/rc')) {
-        res = <INodeVersion>nodeTestDistRc;
+        res = <INodeVersion[]>nodeTestDistRc;
      } else if (url.includes('/nightly')) {
-        res = <INodeVersion>nodeTestDistNightly;
+        res = <INodeVersion[]>nodeTestDistNightly;
      } else {
-        res = <INodeVersion>nodeTestDist;
+        res = <INodeVersion[]>nodeTestDist;
      }

      return {result: res};
@ -156,13 +156,13 @@ describe('setup-node', () => {
    async (versionSpec, platform, expectedVersion, expectedLts) => {
      os.platform = platform;
      os.arch = 'x64';
-      let versions: tc.IToolRelease[] | null = await tc.getManifestFromRepo(
+      const versions: tc.IToolRelease[] | null = await tc.getManifestFromRepo(
        'actions',
        'node-versions',
        'mocktoken'
      );
      expect(versions).toBeDefined();
-      let match = await tc.findFromManifest(versionSpec, true, versions);
+      const match = await tc.findFromManifest(versionSpec, true, versions);
      expect(match).toBeDefined();
      expect(match?.version).toBe(expectedVersion);
      expect((match as any).lts).toBe(expectedLts);
@ -177,7 +177,7 @@ describe('setup-node', () => {
    inputs['node-version'] = '12';
    inputs.stable = 'true';

-    let toolPath = path.normalize('/cache/node/12.16.1/x64');
+    const toolPath = path.normalize('/cache/node/12.16.1/x64');
    findSpy.mockImplementation(() => toolPath);
    await main.run();

@ -189,7 +189,7 @@ describe('setup-node', () => {

    inSpy.mockImplementation(name => inputs[name]);

-    let toolPath = path.normalize('/cache/node/12.16.1/x64');
+    const toolPath = path.normalize('/cache/node/12.16.1/x64');
    findSpy.mockImplementation(() => toolPath);
    await main.run();

@ -201,16 +201,16 @@ describe('setup-node', () => {

    inSpy.mockImplementation(name => inputs[name]);

-    let toolPath = path.normalize('/cache/node/12.16.1/x64');
+    const toolPath = path.normalize('/cache/node/12.16.1/x64');
    findSpy.mockImplementation(() => toolPath);
    await main.run();

-    let expPath = path.join(toolPath, 'bin');
+    const expPath = path.join(toolPath, 'bin');
    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
  });

  it('handles unhandled find error and reports error', async () => {
-    let errMsg = 'unhandled error message';
+    const errMsg = 'unhandled error message';
    inputs['node-version'] = '12';

    findSpy.mockImplementation(() => {
@ -231,27 +231,27 @@ describe('setup-node', () => {
    os.arch = 'x64';

    // a version which is in the manifest
-    let versionSpec = '12.16.2';
-    let resolvedVersion = versionSpec;
+    const versionSpec = '12.16.2';
+    const resolvedVersion = versionSpec;

    inputs['node-version'] = versionSpec;
    inputs['always-auth'] = false;
    inputs['token'] = 'faketoken';

-    let expectedUrl =
+    const expectedUrl =
      'https://github.com/actions/node-versions/releases/download/12.16.2-20200507.95/node-12.16.2-linux-x64.tar.gz';

    // ... but not in the local cache
    findSpy.mockImplementation(() => '');

    dlSpy.mockImplementation(async () => '/some/temp/path');
-    let toolPath = path.normalize('/cache/node/12.16.2/x64');
+    const toolPath = path.normalize('/cache/node/12.16.2/x64');
    exSpy.mockImplementation(async () => '/some/other/temp/path');
    cacheSpy.mockImplementation(async () => toolPath);

    await main.run();

-    let expPath = path.join(toolPath, 'bin');
+    const expPath = path.join(toolPath, 'bin');

    expect(getExecOutputSpy).toHaveBeenCalledWith(
      'node',
@ -284,7 +284,7 @@ describe('setup-node', () => {
    os.arch = 'x64';

    // a version which is not in the manifest but is in node dist
-    let versionSpec = '11.15.0';
+    const versionSpec = '11.15.0';

    inputs['node-version'] = versionSpec;
    inputs['always-auth'] = false;
@ -318,7 +318,7 @@ describe('setup-node', () => {
    os.platform = 'linux';
    os.arch = 'x64';

-    let versionSpec = '9.99.9';
+    const versionSpec = '9.99.9';
    inputs['node-version'] = versionSpec;

    findSpy.mockImplementation(() => '');
@ -336,13 +336,13 @@ describe('setup-node', () => {
  });

  it('reports a failed download', async () => {
-    let errMsg = 'unhandled download message';
+    const errMsg = 'unhandled download message';
    os.platform = 'linux';
    os.arch = 'x64';

    // a version which is in the manifest
-    let versionSpec = '12.16.2';
-    let resolvedVersion = versionSpec;
+    const versionSpec = '12.16.2';
+    const resolvedVersion = versionSpec;

    inputs['node-version'] = versionSpec;
    inputs['always-auth'] = false;
@ -376,7 +376,7 @@ describe('setup-node', () => {
      inputs['always-auth'] = false;
      inputs['token'] = 'faketoken';

-      let expectedUrl =
+      const expectedUrl =
        arch === 'x64'
          ? `https://github.com/actions/node-versions/releases/download/${version}/node-${version}-${platform}-${arch}.zip`
          : `https://nodejs.org/dist/v${version}/node-v${version}-${platform}-${arch}.${fileExtension}`;
@ -385,7 +385,7 @@ describe('setup-node', () => {
      findSpy.mockImplementation(() => '');

      dlSpy.mockImplementation(async () => '/some/temp/path');
-      let toolPath = path.normalize(`/cache/node/${version}/${arch}`);
+      const toolPath = path.normalize(`/cache/node/${version}/${arch}`);
      exSpy.mockImplementation(async () => '/some/other/temp/path');
      cacheSpy.mockImplementation(async () => toolPath);

@ -481,7 +481,7 @@ describe('setup-node', () => {
      os.arch = 'x64';

      // a version which is not in the manifest but is in node dist
-      let versionSpec = '11';
+      const versionSpec = '11';

      inputs['node-version'] = versionSpec;
      inputs['check-latest'] = 'true';
@ -492,13 +492,13 @@ describe('setup-node', () => {
      findSpy.mockImplementation(() => '');

      dlSpy.mockImplementation(async () => '/some/temp/path');
-      let toolPath = path.normalize('/cache/node/11.11.0/x64');
+      const toolPath = path.normalize('/cache/node/11.11.0/x64');
      exSpy.mockImplementation(async () => '/some/other/temp/path');
      cacheSpy.mockImplementation(async () => toolPath);

      await main.run();

-      let expPath = path.join(toolPath, 'bin');
+      const expPath = path.join(toolPath, 'bin');

      expect(dlSpy).toHaveBeenCalled();
      expect(exSpy).toHaveBeenCalled();
@ -523,7 +523,7 @@ describe('setup-node', () => {
      os.arch = 'x64';

      // a version which is not in the manifest but is in node dist
-      let versionSpec = '12';
+      const versionSpec = '12';

      inputs['node-version'] = versionSpec;
      inputs['check-latest'] = 'true';
@ -537,13 +537,13 @@ describe('setup-node', () => {
      });

      dlSpy.mockImplementation(async () => '/some/temp/path');
-      let toolPath = path.normalize('/cache/node/12.11.0/x64');
+      const toolPath = path.normalize('/cache/node/12.11.0/x64');
      exSpy.mockImplementation(async () => '/some/other/temp/path');
      cacheSpy.mockImplementation(async () => toolPath);

      await main.run();

-      let expPath = path.join(toolPath, 'bin');
+      const expPath = path.join(toolPath, 'bin');

      expect(dlSpy).toHaveBeenCalled();
      expect(exSpy).toHaveBeenCalled();
--- a/tests/problem-matcher.test.ts
+++ b/tests/problem-matcher.test.ts
@ -1,10 +1,12 @@
+import tscMatcher from '../.github/tsc.json';
+
 describe('problem matcher tests', () => {
  it('tsc: matches TypeScript "pretty" error message', () => {
    const [
      {
        pattern: [{regexp}]
      }
-    ] = require('../.github/tsc.json').problemMatcher;
+    ] = tscMatcher.problemMatcher;
    const exampleErrorMessage =
      "lib/index.js:23:42 - error TS2345: Argument of type 'A' is not assignable to parameter of type 'B'.";

@ -25,7 +27,7 @@ describe('problem matcher tests', () => {
      {
        pattern: [{regexp}]
      }
-    ] = require('../.github/tsc.json').problemMatcher;
+    ] = tscMatcher.problemMatcher;
    const exampleErrorMessage =
      "lib/index.js(23,42): error TS2345: Argument of type 'A' is not assignable to parameter of type 'B'.";

--- a/tests/rc-installer.test.ts
+++ b/tests/rc-installer.test.ts
@ -12,10 +12,10 @@ import * as main from '../src/main';
 import * as auth from '../src/authutil';
 import {INodeVersion} from '../src/distributions/base-models';

-const nodeTestDist = require('./data/node-dist-index.json');
-const nodeTestDistNightly = require('./data/node-nightly-index.json');
-const nodeTestDistRc = require('./data/node-rc-index.json');
-const nodeV8CanaryTestDist = require('./data/v8-canary-dist-index.json');
+import nodeTestDist from './data/node-dist-index.json';
+import nodeTestDistNightly from './data/node-nightly-index.json';
+import nodeTestDistRc from './data/node-rc-index.json';
+import nodeV8CanaryTestDist from './data/v8-canary-dist-index.json';

 describe('setup-node', () => {
  let inputs = {} as any;
@ -86,11 +86,11 @@ describe('setup-node', () => {
    getJsonSpy.mockImplementation(url => {
      let res: any;
      if (url.includes('/rc')) {
-        res = <INodeVersion>nodeTestDistRc;
+        res = <INodeVersion[]>nodeTestDistRc;
      } else if (url.includes('/nightly')) {
-        res = <INodeVersion>nodeTestDistNightly;
+        res = <INodeVersion[]>nodeTestDistNightly;
      } else {
-        res = <INodeVersion>nodeTestDist;
+        res = <INodeVersion[]>nodeTestDist;
      }

      return {result: res};
@ -142,7 +142,7 @@ describe('setup-node', () => {
    inputs['node-version'] = '12.0.0-rc.1';
    inputs.stable = 'true';

-    let toolPath = path.normalize('/cache/node/12.0.0-rc.1/x64');
+    const toolPath = path.normalize('/cache/node/12.0.0-rc.1/x64');
    findSpy.mockImplementation(() => toolPath);
    await main.run();

@ -154,7 +154,7 @@ describe('setup-node', () => {

    inSpy.mockImplementation(name => inputs[name]);

-    let toolPath = path.normalize('/cache/node/12.0.0-rc.1/x64');
+    const toolPath = path.normalize('/cache/node/12.0.0-rc.1/x64');
    findSpy.mockImplementation(() => toolPath);
    await main.run();

@ -166,16 +166,16 @@ describe('setup-node', () => {

    inSpy.mockImplementation(name => inputs[name]);

-    let toolPath = path.normalize('/cache/node/12.0.0-rc.1/x64');
+    const toolPath = path.normalize('/cache/node/12.0.0-rc.1/x64');
    findSpy.mockImplementation(() => toolPath);
    await main.run();

-    let expPath = path.join(toolPath, 'bin');
+    const expPath = path.join(toolPath, 'bin');
    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
  });

  it('handles unhandled find error and reports error', async () => {
-    let errMsg = 'unhandled error message';
+    const errMsg = 'unhandled error message';
    inputs['node-version'] = '12.0.0-rc.1';

    findSpy.mockImplementation(() => {
@ -191,7 +191,7 @@ describe('setup-node', () => {
    os.platform = 'linux';
    os.arch = 'x64';

-    let versionSpec = '13.0.0-rc.0';
+    const versionSpec = '13.0.0-rc.0';

    inputs['node-version'] = versionSpec;
    inputs['always-auth'] = false;
@ -201,13 +201,13 @@ describe('setup-node', () => {
    findSpy.mockImplementation(() => '');

    dlSpy.mockImplementation(async () => '/some/temp/path');
-    let toolPath = path.normalize('/cache/node/13.0.0-rc.0/x64');
+    const toolPath = path.normalize('/cache/node/13.0.0-rc.0/x64');
    exSpy.mockImplementation(async () => '/some/other/temp/path');
    cacheSpy.mockImplementation(async () => toolPath);

    await main.run();

-    let expPath = path.join(toolPath, 'bin');
+    const expPath = path.join(toolPath, 'bin');

    expect(dlSpy).toHaveBeenCalled();
    expect(exSpy).toHaveBeenCalled();
@ -220,7 +220,7 @@ describe('setup-node', () => {
    os.platform = 'linux';
    os.arch = 'x64';

-    let versionSpec = '9.99.9-rc.1';
+    const versionSpec = '9.99.9-rc.1';
    inputs['node-version'] = versionSpec;

    findSpy.mockImplementation(() => '');
@ -232,11 +232,11 @@ describe('setup-node', () => {
  });

  it('reports a failed download', async () => {
-    let errMsg = 'unhandled download message';
+    const errMsg = 'unhandled download message';
    os.platform = 'linux';
    os.arch = 'x64';

-    let versionSpec = '14.7.0-rc.1';
+    const versionSpec = '14.7.0-rc.1';

    inputs['node-version'] = versionSpec;
    inputs['always-auth'] = false;
@ -271,14 +271,14 @@ describe('setup-node', () => {
      inputs['always-auth'] = false;
      inputs['token'] = 'faketoken';

-      let expectedUrl = `https://nodejs.org/download/rc/v${version}/node-v${version}-${platform}-${arch}.${fileExtension}`;
+      const expectedUrl = `https://nodejs.org/download/rc/v${version}/node-v${version}-${platform}-${arch}.${fileExtension}`;

      // ... but not in the local cache
      findSpy.mockImplementation(() => '');
      findAllVersionsSpy.mockImplementation(() => []);

      dlSpy.mockImplementation(async () => '/some/temp/path');
-      let toolPath = path.normalize(`/cache/node/${version}/${arch}`);
+      const toolPath = path.normalize(`/cache/node/${version}/${arch}`);
      exSpy.mockImplementation(async () => '/some/other/temp/path');
      cacheSpy.mockImplementation(async () => toolPath);

--- a/dist/setup/index.js
+++ b/dist/setup/index.js
@ -73058,7 +73058,7 @@ const restoreCache = (packageManager, cacheDependencyPath) => __awaiter(void 0,
 });
 exports.restoreCache = restoreCache;
 const findLockFile = (packageManager) => {
-    let lockFiles = packageManager.lockFilePatterns;
+    const lockFiles = packageManager.lockFilePatterns;
    const workspace = process.env.GITHUB_WORKSPACE;
    const rootContent = fs_1.default.readdirSync(workspace);
    const lockFile = lockFiles.find(item => rootContent.includes(item));
@ -73391,7 +73391,7 @@ class BaseDistribution {
        let version = '';
        const { range, options } = this.validRange(this.nodeInfo.versionSpec);
        core.debug(`evaluating ${versions.length} versions`);
-        for (let potential of versions) {
+        for (const potential of versions) {
            const satisfied = semver_1.default.satisfies(potential, range, options);
            if (satisfied) {
                version = potential;
@ -73413,17 +73413,17 @@ class BaseDistribution {
        return __awaiter(this, void 0, void 0, function* () {
            const initialUrl = this.getDistributionUrl();
            const dataUrl = `${initialUrl}/index.json`;
-            let response = yield this.httpClient.getJson(dataUrl);
+            const response = yield this.httpClient.getJson(dataUrl);
            return response.result || [];
        });
    }
    getNodejsDistInfo(version) {
-        let osArch = this.translateArchToDistUrl(this.nodeInfo.arch);
+        const osArch = this.translateArchToDistUrl(this.nodeInfo.arch);
        version = semver_1.default.clean(version) || '';
-        let fileName = this.osPlat == 'win32'
+        const fileName = this.osPlat == 'win32'
            ? `node-v${version}-win-${osArch}`
            : `node-v${version}-${this.osPlat}-${osArch}`;
-        let urlFileName = this.osPlat == 'win32' ? `${fileName}.7z` : `${fileName}.tar.gz`;
+        const urlFileName = this.osPlat == 'win32' ? `${fileName}.7z` : `${fileName}.tar.gz`;
        const initialUrl = this.getDistributionUrl();
        const url = `${initialUrl}/v${version}/${urlFileName}`;
        return {
@ -73446,7 +73446,7 @@ class BaseDistribution {
                }
                throw err;
            }
-            let toolPath = yield this.extractArchive(downloadPath, info);
+            const toolPath = yield this.extractArchive(downloadPath, info);
            core.info('Done');
            return toolPath;
        });
@ -73461,7 +73461,7 @@ class BaseDistribution {
    acquireNodeFromFallbackLocation(version, arch = os_1.default.arch()) {
        return __awaiter(this, void 0, void 0, function* () {
            const initialUrl = this.getDistributionUrl();
-            let osArch = this.translateArchToDistUrl(arch);
+            const osArch = this.translateArchToDistUrl(arch);
            // Create temporary folder to download in to
            const tempDownloadFolder = 'temp_' + Math.floor(Math.random() * 2000000000);
            const tempDirectory = process.env['RUNNER_TEMP'] || '';
@ -73529,7 +73529,7 @@ class BaseDistribution {
        });
    }
    getDistFileName() {
-        let osArch = this.translateArchToDistUrl(this.nodeInfo.arch);
+        const osArch = this.translateArchToDistUrl(this.nodeInfo.arch);
        // node offers a json list of versions
        let dataFileName;
        switch (this.osPlat) {
--- a/docs/contributors.md
+++ b/docs/contributors.md
@ -52,7 +52,7 @@ Pull requests are the easiest way to contribute changes to git repos at GitHub.

 - Please check that no one else has already created a pull request with these or similar changes
 - Use a "feature branch" for your changes. That separates the changes in the pull request from your other changes and makes it easy to edit/amend commits in the pull request
-  **Run `pre-checkin` script to format, build and test changes**
+-  **Run `pre-checkin` script to format, lint, build and test changes**
 - Make sure your changes are well formatted and that all tests are passing
 - If your pull request is connected to an open issue, please, leave a link to this issue in the `Related issue:` section
 - If you later need to add new commits to the pull request, you can simply commit the changes to the local branch and then push them. The pull request gets automatically updated
@ -61,6 +61,7 @@ Pull requests are the easiest way to contribute changes to git repos at GitHub.

 - To implement new features or fix bugs, you need to make changes to the `.ts` files, which are located in the `src` folder
 - To comply with the code style, **you need to run the `format` script**
+- To lint the code, **you need to run the `lint:fix` script**
 - To transpile source code to `javascript` we use [NCC](https://github.com/vercel/ncc). **It is very important to run the `build` script after making changes**, otherwise your changes will not get into the final `javascript` build
 - You can also start formatting, building code, and testing with a single `pre-checkin` command

--- a/package-lock.json
+++ b/package-lock.json
--- a/package.json
+++ b/package.json
@ -6,11 +6,12 @@
  "main": "lib/setup-node.js",
  "scripts": {
    "build": "ncc build -o dist/setup src/setup-node.ts && ncc build -o dist/cache-save src/cache-save.ts",
-    "format": "prettier --write **/*.ts",
-    "format-check": "prettier --check **/*.ts",
-    "lint": "echo \"Fake command that does nothing. It is used in reusable workflows\"",
+    "format": "prettier --no-error-on-unmatched-pattern --config ./.prettierrc.js --write **/*.{ts,yml,yaml}",
+    "format-check": "prettier --no-error-on-unmatched-pattern --config ./.prettierrc.js --check **/*.{ts,yml,yaml}",
+    "lint": "eslint --config ./.eslintrc.js **/*.ts",
+    "lint:fix": "eslint --config ./.eslintrc.js **/*.ts --fix",
    "test": "jest --coverage",
-    "pre-checkin": "npm run format && npm run build && npm test"
+    "pre-checkin": "npm run format && npm run lint:fix && npm run build && npm test"
  },
  "repository": {
    "type": "git",
@ -38,10 +39,15 @@
    "@types/jest": "^27.0.2",
    "@types/node": "^16.11.25",
    "@types/semver": "^6.0.0",
+    "@typescript-eslint/eslint-plugin": "^5.54.0",
+    "@typescript-eslint/parser": "^5.54.0",
    "@vercel/ncc": "^0.33.4",
+    "eslint": "^8.35.0",
+    "eslint-config-prettier": "^8.6.0",
+    "eslint-plugin-jest": "^27.2.1",
    "jest": "^27.2.5",
    "jest-circus": "^27.2.5",
-    "prettier": "^1.19.1",
+    "prettier": "^2.8.4",
    "ts-jest": "^27.0.5",
    "typescript": "^4.2.3"
  }
--- a/src/authutil.ts
+++ b/src/authutil.ts
@ -33,7 +33,7 @@ function writeRegistryToFile(
  }

  core.debug(`Setting auth in ${fileLocation}`);
-  let newContents: string = '';
+  let newContents = '';
  if (fs.existsSync(fileLocation)) {
    const curContents: string = fs.readFileSync(fileLocation, 'utf8');
    curContents.split(os.EOL).forEach((line: string) => {
@ -46,8 +46,8 @@ function writeRegistryToFile(
  // Remove http: or https: from front of registry.
  const authString: string =
    registryUrl.replace(/(^\w+:|^)/, '') + ':_authToken=${NODE_AUTH_TOKEN}';
-  const registryString: string = `${scope}registry=${registryUrl}`;
-  const alwaysAuthString: string = `always-auth=${alwaysAuth}`;
+  const registryString = `${scope}registry=${registryUrl}`;
+  const alwaysAuthString = `always-auth=${alwaysAuth}`;
  newContents += `${authString}${os.EOL}${registryString}${os.EOL}${alwaysAuthString}`;
  fs.writeFileSync(fileLocation, newContents);
  core.exportVariable('NPM_CONFIG_USERCONFIG', fileLocation);
--- a/src/cache-restore.ts
+++ b/src/cache-restore.ts
@ -54,7 +54,7 @@ export const restoreCache = async (
 };

 const findLockFile = (packageManager: PackageManagerInfo) => {
-  let lockFiles = packageManager.lockFilePatterns;
+  const lockFiles = packageManager.lockFilePatterns;
  const workspace = process.env.GITHUB_WORKSPACE!;
  const rootContent = fs.readdirSync(workspace);

--- a/src/distributions/base-distribution.ts
+++ b/src/distributions/base-distribution.ts
@ -70,7 +70,7 @@ export default abstract class BaseDistribution {

    core.debug(`evaluating ${versions.length} versions`);

-    for (let potential of versions) {
+    for (const potential of versions) {
      const satisfied: boolean = semver.satisfies(potential, range, options);
      if (satisfied) {
        version = potential;
@ -95,18 +95,18 @@ export default abstract class BaseDistribution {
    const initialUrl = this.getDistributionUrl();
    const dataUrl = `${initialUrl}/index.json`;

-    let response = await this.httpClient.getJson<INodeVersion[]>(dataUrl);
+    const response = await this.httpClient.getJson<INodeVersion[]>(dataUrl);
    return response.result || [];
  }

  protected getNodejsDistInfo(version: string) {
-    let osArch: string = this.translateArchToDistUrl(this.nodeInfo.arch);
+    const osArch: string = this.translateArchToDistUrl(this.nodeInfo.arch);
    version = semver.clean(version) || '';
-    let fileName: string =
+    const fileName: string =
      this.osPlat == 'win32'
        ? `node-v${version}-win-${osArch}`
        : `node-v${version}-${this.osPlat}-${osArch}`;
-    let urlFileName: string =
+    const urlFileName: string =
      this.osPlat == 'win32' ? `${fileName}.7z` : `${fileName}.tar.gz`;
    const initialUrl = this.getDistributionUrl();
    const url = `${initialUrl}/v${version}/${urlFileName}`;
@ -137,7 +137,7 @@ export default abstract class BaseDistribution {
      throw err;
    }

-    let toolPath = await this.extractArchive(downloadPath, info);
+    const toolPath = await this.extractArchive(downloadPath, info);
    core.info('Done');

    return toolPath;
@ -156,7 +156,7 @@ export default abstract class BaseDistribution {
    arch: string = os.arch()
  ): Promise<string> {
    const initialUrl = this.getDistributionUrl();
-    let osArch: string = this.translateArchToDistUrl(arch);
+    const osArch: string = this.translateArchToDistUrl(arch);

    // Create temporary folder to download in to
    const tempDownloadFolder: string =
@ -240,7 +240,7 @@ export default abstract class BaseDistribution {
  }

  protected getDistFileName(): string {
-    let osArch: string = this.translateArchToDistUrl(this.nodeInfo.arch);
+    const osArch: string = this.translateArchToDistUrl(this.nodeInfo.arch);

    // node offers a json list of versions
    let dataFileName: string;
--- a/tsconfig.json
+++ b/tsconfig.json
@ -7,7 +7,8 @@
    "sourceMap": true,
    "strict": true,                           /* Enable all strict type-checking options. */
    "noImplicitAny": false,                   /* Raise error on expressions and declarations with an implied 'any' type. */
-    "esModuleInterop": true                   /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+    "esModuleInterop": true,                   /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+    "resolveJsonModule": true,                /* Allows importing modules with a '.json' extension, which is a common practice in node projects. */
  },
  "exclude": ["__tests__", "lib", "node_modules"]
 }