Add test for ESLint v8

.github/workflows/CI.yml

@@ -29,8 +29,8 @@ jobs:
     name: Test
     strategy:
       matrix:
-        eslint: [7]
-        node: [14]
+        eslint: [7, '8.0.0-0']
+        node: [14, 16]
         os: [ubuntu-latest]
         include:
           # On other platforms

package.json

@@ -22,6 +22,11 @@
     "semver": "^6.3.0"
   },
   "devDependencies": {
+    "@babel/core": "^7.15.0",
+    "@babel/eslint-parser": "^7.15.0",
+    "@babel/plugin-syntax-decorators": "^7.14.5",
+    "@babel/plugin-syntax-pipeline-operator": "^7.15.0",
+    "@babel/plugin-syntax-typescript": "^7.14.5",
     "@mysticatea/eslint-plugin": "^13.0.0",
     "@types/debug": "0.0.30",
     "@types/eslint": "^7.2.6",
@@ -67,7 +72,7 @@
     "pretest": "run-s build lint",
     "test": "npm run -s test:mocha",
     "test:mocha": "nyc mocha \"test/*.js\" --reporter dot --timeout 60000",
-    "test:debug": "mocha --inspect --require ts-node/register/transpile-only \"test/*.js\" --reporter dot --timeout 60000",
+    "test:debug": "mocha --require ts-node/register/transpile-only \"test/*.js\" --reporter dot --timeout 60000",
     "preupdate-fixtures": "npm run -s build",
     "update-fixtures": "node scripts/update-fixtures-ast.js && node scripts/update-fixtures-document-fragment.js",
     "preversion": "npm test",

scripts/ci-install-eslint.js

@@ -12,7 +12,7 @@ function sh(command) {
     return new Promise((resolve, reject) => {
         spawn(command, [], { shell: true, stdio: "inherit" })
             .on("error", reject)
-            .on("exit", exitCode => {
+            .on("exit", (exitCode) => {
                 if (exitCode) {
                     reject(new Error(`Exit with non-zero ${exitCode}`))
                 } else {
@@ -29,19 +29,19 @@ function sh(command) {
         : `^${requestedVersion}`
 
     // Install ESLint of the requested version
-    await sh(`npm install eslint@${requestedVersionSpec}`)
+    await sh(`npm install eslint@${requestedVersionSpec} --legacy-peer-deps`)
 
     // Install ESLint submodule of the requested version
-    const installedVersion = require("eslint").CLIEngine.version
+    const installedVersion = require("eslint/package.json").version
     cd("test/fixtures/eslint")
     if (!installedVersion.startsWith("7.")) {
         await sh(`git checkout v${installedVersion}`)
     }
     if (installedVersion.startsWith("5.")) {
         await sh("npm install eslint-utils@1.4.0")
     }
-    await sh("npm install")
-})().catch(error => {
+    await sh("npm install --legacy-peer-deps")
+})().catch((error) => {
     console.error(error)
     process.exitCode = 1
 })

scripts/update-fixtures-ast.js

@@ -208,8 +208,11 @@ for (const name of TARGETS) {
         : {}
     if (
         Object.entries(requirements).some(([pkgName, pkgVersion]) => {
-            const pkg = require(`${pkgName}/package.json`)
-            return !semver.satisfies(pkg.version, pkgVersion)
+            const version =
+                pkgName === "node"
+                    ? process.version
+                    : require(`${pkgName}/package.json`).version
+            return !semver.satisfies(version, pkgVersion)
         })
     ) {
         continue

test/ast.js

@@ -190,8 +190,11 @@ describe("Template AST", () => {
 
         if (
             Object.entries(requirements).some(([pkgName, pkgVersion]) => {
-                const pkg = require(`${pkgName}/package.json`)
-                return !semver.satisfies(pkg.version, pkgVersion)
+                const version =
+                    pkgName === "node"
+                        ? process.version
+                        : require(`${pkgName}/package.json`).version
+                return !semver.satisfies(version, pkgVersion)
             })
         ) {
             continue

test/core-rules.js

@@ -104,8 +104,15 @@ function modifyPattern(ruleId, pattern) {
 
     // Ignore for now
     if (
-        ruleId === "newline-per-chained-call" &&
-        pattern.code === "foo.bar()['foo' + \u2029 + 'bar']()"
+        (ruleId === "newline-per-chained-call" &&
+            pattern.code === "foo.bar()['foo' + \u2029 + 'bar']()") ||
+        (ruleId === "no-nonoctal-decimal-escape" &&
+            pattern.code === "'\\\r\n\\9'") ||
+        // The location is reported as a fixed value: { line: 1, column: 0 }.
+        (ruleId === "consistent-return" &&
+            pattern.parserOptions &&
+            pattern.parserOptions.ecmaFeatures &&
+            pattern.parserOptions.ecmaFeatures.globalReturn === true)
     ) {
         return null
     }
@@ -151,6 +158,22 @@ function modifyPattern(ruleId, pattern) {
                     }
                 }
 
+                // `no-shadow` rule is special a bit.
+                if (ruleId === "no-shadow") {
+                    // The data that the rule gives to the message contains the location.
+                    if (
+                        error.data &&
+                        error.data &&
+                        Object.hasOwnProperty.call(
+                            error.data,
+                            "shadowedLine"
+                        ) &&
+                        typeof error.data.shadowedLine === "number"
+                    ) {
+                        error.data.shadowedLine++
+                    }
+                }
+
                 // Wrap the code by `<script>` tag.
                 if (Array.isArray(error.suggestions)) {
                     for (const suggestion of error.suggestions) {

test/fixtures/ast/end-of-line01/requirements.json

@@ -0,0 +1,3 @@
+{
+    "eslint": "<8"
+}

test/fixtures/ast/end-of-line02/requirements.json

@@ -0,0 +1,3 @@
+{
+    "eslint": "<8"
+}