tools: move eslint from tools to tools/node_modules

This is required because we need to add the babel-eslint dependency
and it has to be able to resolve "eslint".
babel-eslint is required to support future ES features such as async
iterators and import.meta.

Refs: https://github.com/nodejs/node/pull/17755
PR-URL: https://github.com/nodejs/node/pull/17820
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

.editorconfig

@@ -36,5 +36,5 @@ end_of_line = ignore
 trim_trailing_whitespace = ignore
 charset = ignore
 
-[{test/fixtures,deps,tools/eslint,tools/gyp,tools/icu,tools/msvs}/**]
+[{test/fixtures,deps,tools/node_modules,tools/gyp,tools/icu,tools/msvs}/**]
 insert_final_newline = false

.eslintignore

@@ -5,7 +5,7 @@ test/addons/??_*
 test/es-module/test-esm-dynamic-import.js
 test/fixtures
 test/message/esm_display_syntax_error.mjs
-tools/eslint
+tools/node_modules
 tools/icu
 tools/remark-*
 node_modules

.gitignore

@@ -2,7 +2,7 @@
 .*
 !deps/**/.*
 !test/fixtures/**/.*
-!tools/eslint/**/.*
+!tools/node_modules/**/.*
 !tools/doc/node_modules/**/.*
 !.editorconfig
 !.eslintignore

LICENSE

@@ -1061,7 +1061,7 @@ The externally maintained libraries used by Node.js are:
     OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   """
 
-- ESLint, located at tools/eslint, is licensed as follows:
+- ESLint, located at tools/node_modules/eslint, is licensed as follows:
   """
     Copyright JS Foundation and other contributors, https://js.foundation
 

Makefile

@@ -914,7 +914,7 @@ $(TARBALL): release-only $(NODE_EXE) doc
 	$(RM) -r $(TARNAME)/deps/openssl/openssl/{doc,demos,test}
 	$(RM) -r $(TARNAME)/deps/zlib/contrib # too big, unused
 	$(RM) -r $(TARNAME)/.{editorconfig,git*,mailmap}
-	$(RM) -r $(TARNAME)/tools/{eslint,eslint-rules,osx-pkg.pmdoc,pkgsrc,remark-cli,remark-preset-lint-node}
+	$(RM) -r $(TARNAME)/tools/{eslint-rules,node_modules,osx-pkg.pmdoc,pkgsrc,remark-cli,remark-preset-lint-node}
 	$(RM) -r $(TARNAME)/tools/{osx-*,license-builder.sh,cpplint.py}
 	$(RM) -r $(TARNAME)/test*.tap
 	find $(TARNAME)/ -name ".eslint*" -maxdepth 2 | xargs $(RM)
@@ -1116,7 +1116,7 @@ lint-md:
 endif
 
 LINT_JS_TARGETS = benchmark doc lib test tools
-LINT_JS_CMD = tools/eslint/bin/eslint.js --cache \
+LINT_JS_CMD = tools/node_modules/eslint/bin/eslint.js --cache \
 	--rulesdir=tools/eslint-rules --ext=.js,.mjs,.md \
 	$(LINT_JS_TARGETS)
 
@@ -1207,7 +1207,7 @@ cpplint: lint-cpp
 
 .PHONY: lint
 .PHONY: lint-ci
-ifneq ("","$(wildcard tools/eslint/)")
+ifneq ("","$(wildcard tools/node_modules/eslint/)")
 lint: ## Run JS, C++, MD and doc linters.
 	@EXIT_STATUS=0 ; \
 	$(MAKE) lint-js || EXIT_STATUS=$$? ; \

doc/onboarding-extras.md

@@ -29,7 +29,7 @@
 | `src/node_api.*`                         | @nodejs/n-api                                                         |
 | `src/node_crypto.*`                      | @nodejs/crypto                                                        |
 | `test/*`                                 | @nodejs/testing                                                       |
-| `tools/eslint`, `.eslintrc`           | @not-an-aardvark, @silverwind, @trott                                 |
+| `tools/node_modules/eslint`, `.eslintrc` | @not-an-aardvark, @silverwind, @trott                                 |
 | build                                    | @nodejs/build                                                         |
 | ES Modules                               | @bmeck, @Fishrock123, @guybedford, @MylesBorins, @targos              |
 | GYP                                      | @nodejs/gyp                                                           |

test/doctool/test-doctool-html.js

@@ -1,9 +1,9 @@
 'use strict';
 
 const common = require('../common');
-// The doctool currently uses js-yaml from the tool/eslint/ tree.
+// The doctool currently uses js-yaml from the tool/node_modules/eslint/ tree.
 try {
-  require('../../tools/eslint/node_modules/js-yaml');
+  require('../../tools/node_modules/eslint/node_modules/js-yaml');
 } catch (e) {
   common.skip('missing js-yaml (eslint not present)');
 }

test/parallel/test-eslint-alphabetize-errors.js

@@ -2,7 +2,7 @@
 
 require('../common');
 
-const RuleTester = require('../../tools/eslint').RuleTester;
+const RuleTester = require('../../tools/node_modules/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/alphabetize-errors');
 
 new RuleTester().run('alphabetize-errors', rule, {

test/parallel/test-eslint-buffer-constructor.js

@@ -2,7 +2,7 @@
 
 require('../common');
 
-const RuleTester = require('../../tools/eslint').RuleTester;
+const RuleTester = require('../../tools/node_modules/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/buffer-constructor');
 
 const message = 'Use of the Buffer() constructor has been deprecated. ' +

test/parallel/test-eslint-crypto-check.js

@@ -2,7 +2,7 @@
 
 require('../common');
 
-const RuleTester = require('../../tools/eslint').RuleTester;
+const RuleTester = require('../../tools/node_modules/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/crypto-check');
 
 const message = 'Please add a hasCrypto check to allow this test to be ' +

test/parallel/test-eslint-documented-errors.js

@@ -2,7 +2,7 @@
 
 require('../common');
 
-const RuleTester = require('../../tools/eslint').RuleTester;
+const RuleTester = require('../../tools/node_modules/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/documented-errors');
 
 const invalidCode = 'UNDOCUMENTED ERROR CODE';

test/parallel/test-eslint-inspector-check.js

@@ -2,7 +2,7 @@
 
 require('../common');
 
-const RuleTester = require('../../tools/eslint').RuleTester;
+const RuleTester = require('../../tools/node_modules/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/inspector-check');
 
 const message = 'Please add a skipIfInspectorDisabled() call to allow this ' +

test/parallel/test-eslint-lowercase-name-for-primitive.js

@@ -2,7 +2,7 @@
 
 require('../common');
 
-const RuleTester = require('../../tools/eslint').RuleTester;
+const RuleTester = require('../../tools/node_modules/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/lowercase-name-for-primitive');
 
 const valid = [

test/parallel/test-eslint-no-let-in-for-declaration.js

@@ -2,7 +2,7 @@
 
 require('../common');
 
-const RuleTester = require('../../tools/eslint').RuleTester;
+const RuleTester = require('../../tools/node_modules/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/no-let-in-for-declaration');
 
 const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 6 } });

test/parallel/test-eslint-no-unescaped-regexp-dot.js

@@ -2,7 +2,7 @@
 
 require('../common');
 
-const RuleTester = require('../../tools/eslint').RuleTester;
+const RuleTester = require('../../tools/node_modules/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/no-unescaped-regexp-dot');
 
 new RuleTester().run('no-unescaped-regexp-dot', rule, {

test/parallel/test-eslint-number-isnan.js

@@ -2,7 +2,7 @@
 
 require('../common');
 
-const RuleTester = require('../../tools/eslint').RuleTester;
+const RuleTester = require('../../tools/node_modules/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/number-isnan');
 
 const message = 'Please use Number.isNaN instead of the global isNaN function';

test/parallel/test-eslint-prefer-assert-iferror.js

@@ -2,7 +2,7 @@
 
 require('../common');
 
-const RuleTester = require('../../tools/eslint').RuleTester;
+const RuleTester = require('../../tools/node_modules/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/prefer-assert-iferror');
 
 new RuleTester().run('prefer-assert-iferror', rule, {

test/parallel/test-eslint-prefer-assert-methods.js

@@ -2,7 +2,7 @@
 
 require('../common');
 
-const RuleTester = require('../../tools/eslint').RuleTester;
+const RuleTester = require('../../tools/node_modules/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/prefer-assert-methods');
 
 new RuleTester().run('prefer-assert-methods', rule, {

test/parallel/test-eslint-prefer-common-expectserror.js

@@ -2,7 +2,7 @@
 
 require('../common');
 
-const RuleTester = require('../../tools/eslint').RuleTester;
+const RuleTester = require('../../tools/node_modules/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/prefer-common-expectserror');
 
 const message = 'Please use common.expectsError(fn, err) instead of ' +

test/parallel/test-eslint-prefer-common-mustnotcall.js

@@ -2,7 +2,7 @@
 
 require('../common');
 
-const RuleTester = require('../../tools/eslint').RuleTester;
+const RuleTester = require('../../tools/node_modules/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/prefer-common-mustnotcall');
 
 const message = 'Please use common.mustNotCall(msg) instead of ' +

test/parallel/test-eslint-prefer-util-format-errors.js

@@ -4,7 +4,7 @@
 
 require('../common');
 
-const RuleTester = require('../../tools/eslint').RuleTester;
+const RuleTester = require('../../tools/node_modules/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/prefer-util-format-errors');
 
 new RuleTester({ parserOptions: { ecmaVersion: 6 } })

test/parallel/test-eslint-require-buffer.js

@@ -2,7 +2,7 @@
 
 require('../common');
 
-const RuleTester = require('../../tools/eslint').RuleTester;
+const RuleTester = require('../../tools/node_modules/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/require-buffer');
 const ruleTester = new RuleTester({
   parserOptions: { ecmaVersion: 6 },

test/parallel/test-eslint-required-modules.js

@@ -2,7 +2,7 @@
 
 require('../common');
 
-const RuleTester = require('../../tools/eslint').RuleTester;
+const RuleTester = require('../../tools/node_modules/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/required-modules');
 
 new RuleTester().run('required-modules', rule, {

tools/doc/node_modules/js-yaml/index.js

@@ -7,6 +7,7 @@ const path = require('path');
 
 const realJSYaml = path.resolve(
   __dirname, '..', '..', '..', // tools/
+  'node_modules',
   'eslint',
   'node_modules',
   'js-yaml'

tools/license-builder.sh

@@ -77,7 +77,7 @@ addlicense "marked" "tools/doc/node_modules/marked" \
 # Testing tools
 addlicense "cpplint.py" "tools/cpplint.py" \
            "$(sed -e '/^$/,$d' -e 's/^#$//' -e 's/^# //' ${rootdir}/tools/cpplint.py | tail -n +3)"
-addlicense "ESLint" "tools/eslint" "$(cat ${rootdir}/tools/eslint/LICENSE)"
+addlicense "ESLint" "tools/node_modules/eslint" "$(cat ${rootdir}/tools/node_modules/eslint/LICENSE)"
 addlicense "gtest" "deps/gtest" "$(cat ${rootdir}/deps/gtest/LICENSE)"
 
 # nghttp2

tools/lint-js.js

@@ -10,8 +10,8 @@ const path = require('path');
 const fs = require('fs');
 const totalCPUs = require('os').cpus().length;
 
-const CLIEngine = require('./eslint').CLIEngine;
-const glob = require('./eslint/node_modules/glob');
+const CLIEngine = require('eslint').CLIEngine;
+const glob = require('eslint/node_modules/glob');
 
 const cliOptions = {
   rulePaths: rulesDirs,