first commit

app_vue/node_modules/@vue/cli-plugin-eslint/migrator/index.js

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+const { semver } = require('@vue/cli-shared-utils')
+
+/** @param {import('@vue/cli/lib/MigratorAPI')} api MigratorAPI */
+module.exports = async (api) => {
+  const pkg = require(api.resolve('package.json'))
+
+  let localESLintRange = pkg.devDependencies.eslint
+
+  // if project is scaffolded by Vue CLI 3.0.x or earlier,
+  // the ESLint dependency (ESLint v4) is inside @vue/cli-plugin-eslint;
+  // in Vue CLI v4 it should be extracted to the project dependency list.
+  if (api.fromVersion('^3') && !localESLintRange) {
+    localESLintRange = '^4.19.1'
+    api.extendPackage({
+      devDependencies: {
+        eslint: localESLintRange,
+        '@babel/eslint-parser': '^7.12.16',
+        'eslint-plugin-vue': '^4.5.0'
+      }
+    })
+  }
+
+  const localESLintMajor = semver.major(
+    semver.maxSatisfying(['4.99.0', '5.99.0', '6.99.0', '7.99.0'], localESLintRange) ||
+      // in case the user does not specify a typical caret range;
+      // it is used as **fallback** because the user may have not previously
+      // installed eslint yet, such as in the case that they are from v3.0.x
+      // eslint-disable-next-line node/no-extraneous-require
+      require('eslint/package.json').version
+  )
+
+  if (localESLintMajor > 6) {
+    return
+  }
+
+  const { getDeps } = require('../eslintDeps')
+
+  const newDeps = getDeps(api)
+  if (pkg.devDependencies['@vue/eslint-config-airbnb']) {
+    Object.assign(newDeps, getDeps(api, 'airbnb'))
+  }
+  if (pkg.devDependencies['@vue/eslint-config-standard']) {
+    Object.assign(newDeps, getDeps(api, 'standard'))
+  }
+  if (pkg.devDependencies['@vue/eslint-config-prettier']) {
+    Object.assign(newDeps, getDeps(api, 'prettier'))
+  }
+
+  const fields = { devDependencies: newDeps }
+
+  if (newDeps['@babel/core'] && newDeps['@babel/eslint-parser']) {
+    Reflect.deleteProperty(api.generator.pkg.devDependencies, 'babel-eslint')
+
+    const minSupportedBabelCoreVersion = '>=7.2.0'
+    const localBabelCoreVersion = pkg.devDependencies['@babel/core']
+
+    if (localBabelCoreVersion &&
+      semver.satisfies(
+        localBabelCoreVersion,
+        minSupportedBabelCoreVersion
+      )) {
+      Reflect.deleteProperty(newDeps, '@babel/core')
+    }
+
+    fields.eslintConfig = {
+      parserOptions: {
+        parser: '@babel/eslint-parser'
+      }
+    }
+  }
+
+  api.extendPackage(fields, { warnIncompatibleVersions: false })
+
+  // in case anyone's upgrading from the legacy `typescript-eslint-parser`
+  if (api.hasPlugin('typescript')) {
+    api.extendPackage({
+      eslintConfig: {
+        parserOptions: {
+          parser: '@typescript-eslint/parser'
+        }
+      }
+    })
+  }
+
+  api.exitLog(`ESLint upgraded from v${localESLintMajor}. to v7\n`)
+
+  // TODO:
+  // transform `@vue/prettier` to `eslint:recommended` + `plugin:prettier/recommended`
+  // remove `@vue/prettier/@typescript-eslint`
+  // transform `@vue/typescript` to `@vue/typescript/recommended` and also fix prettier compatibility for it
+}