Fix TypeScript errors

package.json

@@ -60,6 +60,7 @@
     "slash": "^2.0.0"
   },
   "devDependencies": {
+    "@types/del": "^3.0.1",
     "@types/execa": "^0.9.0",
     "@types/find-up": "^2.1.1",
     "@types/get-stdin": "^5.0.1",

src/installer/__tests__/index.ts

@@ -7,7 +7,7 @@ import * as tempy from 'tempy'
 import { install, uninstall } from '../'
 import { huskyIdentifier } from '../getScript'
 
-let tempDir
+let tempDir: string
 
 const pkg = JSON.stringify({})
 
@@ -236,7 +236,7 @@ describe('install', () => {
     writeFile('package.json', pkg)
 
     installFrom(huskyDir)
-    expect(exists('.git/hooks/pre-commit')).toBeFalsy()
+    expect(exists(hookFilename)).toBeFalsy()
   })
 
   it('should migrate existing scripts (ghooks)', () => {

src/runner/__tests__/index.ts

@@ -5,9 +5,9 @@ import * as path from 'path'
 import * as tempy from 'tempy'
 import index from '../'
 
-let spy
+let spy: jest.SpyInstance
 
-function getScriptPath(dir) {
+function getScriptPath(dir: string) {
   return path.join(dir, 'node_modules/husky/runner/index.js')
 }
 
@@ -35,7 +35,7 @@ describe('run', () => {
       })
     )
 
-    const status = await index([, getScriptPath(dir), 'pre-commit'])
+    const status = await index(['', getScriptPath(dir), 'pre-commit'])
     expect(execa.shellSync).toHaveBeenCalledWith('echo success', {
       cwd: dir,
       env: {},
@@ -60,7 +60,7 @@ describe('run', () => {
       })
     )
 
-    const status = await index([, getScriptPath(subDir), 'pre-commit'])
+    const status = await index(['', getScriptPath(subDir), 'pre-commit'])
     expect(execa.shellSync).toHaveBeenCalledWith('echo success', {
       cwd: subDir,
       env: {},
@@ -81,7 +81,7 @@ describe('run', () => {
       })
     )
 
-    const status = await index([, getScriptPath(dir), 'pre-commit'])
+    const status = await index(['', getScriptPath(dir), 'pre-commit'])
     expect(execa.shellSync).not.toBeCalled()
     expect(status).toBe(0)
   })
@@ -100,7 +100,7 @@ describe('run', () => {
       })
     )
 
-    const status = await index([, getScriptPath(dir), 'pre-commit'])
+    const status = await index(['', getScriptPath(dir), 'pre-commit'])
     expect(execa.shellSync).toHaveBeenCalledWith('echo fail && exit 2', {
       cwd: dir,
       env: {},
@@ -121,7 +121,7 @@ describe('run', () => {
       })
     )
 
-    const status = await index([, getScriptPath(dir), 'pre-commit'])
+    const status = await index(['', getScriptPath(dir), 'pre-commit'])
     expect(execa.shellSync).toHaveBeenCalledWith('echo success', {
       cwd: dir,
       env: {},
@@ -144,7 +144,7 @@ describe('run', () => {
       })
     )
 
-    const status = await index([, getScriptPath(dir), 'pre-push'], () =>
+    const status = await index(['', getScriptPath(dir), 'pre-push'], () =>
       Promise.resolve('foo')
     )
     expect(execa.shellSync).toHaveBeenCalledWith('echo success', {
@@ -173,7 +173,7 @@ describe('run', () => {
 
     // commit-msg takes one parameter from git
     const status = await index([
-      ,
+      '',
       getScriptPath(dir),
       'commit-msg',
       'git fake param'

src/runner/index.ts

@@ -14,7 +14,7 @@ export interface IEnv extends NodeJS.ProcessEnv {
  */
 export default async function run(
   [, scriptPath, hookName = '', HUSKY_GIT_PARAMS]: string[],
-  getStdinFn = getStdin // Used for mocking
+  getStdinFn: () => Promise<string> = getStdin // Used for mocking
 ): Promise<number> {
   const cwd = path.resolve(scriptPath.split('node_modules')[0])
   const pkg = readPkg.sync({ cwd, normalize: false })