assert, tools: enforce strict (not)equal in eslint

Extend no-restricted-properties to catch use of assert.equal() and
assert.notEqual() and require assert.strictEqual() or
assert.notStrictEqual() instead.

Also update the eslint-ignore in lib/assert.js to avoid
assert.equal/notEqual linter errors in their definitions.

PR-URL: nodejs#10698
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Teddy Katz <teddy.katz@gmail.com>

.eslintrc.yaml

@@ -62,17 +62,21 @@ rules:
   no-new-require: 2
   no-path-concat: 2
   no-restricted-modules: [2, sys, _linklist]
-  no-restricted-properties: [2, {
-    object: assert,
-    property: deepEqual,
-    message: Please use assert.deepStrictEqual().
-  }, {
-    property: __defineGetter__,
-    message: __defineGetter__ is deprecated.
-  }, {
-    property: __defineSetter__,
-    message: __defineSetter__ is deprecated.
-  }]
+  no-restricted-properties:
+    - 2
+    - object: assert
+      property: deepEqual
+      message: Use assert.deepStrictEqual().
+    - object: assert
+      property: equal
+      message: Use assert.strictEqual() rather than assert.equal().
+    - object: assert
+      property: notEqual
+      message: Use assert.notStrictEqual() rather than assert.notEqual().
+    - property: __defineGetter__
+      message: __defineGetter__ is deprecated.
+    - property: __defineSetter__,
+      message: __defineSetter__ is deprecated.
 
   # Stylistic Issues
   # http://eslint.org/docs/rules/#stylistic-issues
@@ -86,7 +90,7 @@ rules:
   func-name-matching: 2
   indent: [2, 2, {ArrayExpression: first,
                   CallExpression: {arguments: first},
-                  MemberExpression: 1, 
+                  MemberExpression: 1,
                   ObjectExpression: first,
                   SwitchCase: 1}]
   key-spacing: [2, {mode: minimum}]

lib/assert.js

@@ -109,7 +109,7 @@ assert.ok = ok;
 // The equality assertion tests shallow, coercive equality with
 // ==.
 // assert.equal(actual, expected, message_opt);
-
+/* eslint-disable no-restricted-properties */
 assert.equal = function equal(actual, expected, message) {
   if (actual != expected) fail(actual, expected, message, '==', assert.equal);
 };
@@ -127,7 +127,6 @@ assert.notEqual = function notEqual(actual, expected, message) {
 // The equivalence assertion tests a deep equality relation.
 // assert.deepEqual(actual, expected, message_opt);
 
-/* eslint-disable no-restricted-properties */
 assert.deepEqual = function deepEqual(actual, expected, message) {
   if (!_deepEqual(actual, expected, false)) {
     fail(actual, expected, message, 'deepEqual', assert.deepEqual);