fix: only enable TSLint when tslint.json exists

Author: yyx990803

Diff for: packages/@vue/cli-plugin-typescript/__tests__/tsGenerator.spec.js

@@ -72,7 +72,6 @@ test('lint', async () => {
   ])
 
   expect(pkg.scripts.lint).toBe(`vue-cli-service lint`)
-  expect(pkg.vue).toEqual({ lintOnSave: true })
   expect(pkg.devDependencies).toHaveProperty('lint-staged')
   expect(pkg.gitHooks).toEqual({ 'pre-commit': 'lint-staged' })
   expect(pkg['lint-staged']).toEqual({
@@ -83,6 +82,20 @@ test('lint', async () => {
   expect(files['tslint.json']).toBeTruthy()
 })
 
+test('lint with no lintOnSave', async () => {
+  const { pkg } = await generateWithPlugin([
+    {
+      id: 'ts',
+      apply: require('../generator'),
+      options: {
+        tsLint: true,
+        lintOn: ['commit']
+      }
+    }
+  ])
+  expect(pkg.vue).toEqual({ lintOnSave: false })
+})
+
 test('compat with unit-mocha', async () => {
   const { pkg } = await generateWithPlugin([
     {

Diff for: packages/@vue/cli-plugin-typescript/generator/index.js

@@ -50,12 +50,17 @@ module.exports = (api, {
     api.extendPackage({
       scripts: {
         lint: 'vue-cli-service lint'
-      },
-      vue: {
-        lintOnSave: lintOn.includes('save')
       }
     })
 
+    if (!lintOn.includes('save')) {
+      api.extendPackage({
+        vue: {
+          lintOnSave: false
+        }
+      })
+    }
+
     if (lintOn.includes('commit')) {
       api.extendPackage({
         devDependencies: {

Diff for: packages/@vue/cli-plugin-typescript/index.js

@@ -3,6 +3,7 @@ module.exports = (api, {
   lintOnSave,
   experimentalCompileTsWithBabel
 }) => {
+  const fs = require('fs')
   const useThreads = process.env.NODE_ENV === 'production' && parallel
   const cacheDirectory = api.resolve('node_modules/.cache/cache-loader')
 
@@ -81,7 +82,7 @@ module.exports = (api, {
       .plugin('fork-ts-checker')
         .use(require('fork-ts-checker-webpack-plugin'), [{
           vue: true,
-          tslint: lintOnSave !== false,
+          tslint: lintOnSave !== false && fs.existsSync(api.resolve('tslint.json')),
           formatter: 'codeframe',
           // https://github.com/TypeStrong/ts-loader#happypackmode-boolean-defaultfalse
           checkSyntacticErrors: useThreads