diff --git a/lib/rules/indent-legacy.js b/lib/rules/indent-legacy.js
index 50010d3f7ac..a26ee87b130 100644
--- a/lib/rules/indent-legacy.js
+++ b/lib/rules/indent-legacy.js
@@ -954,7 +954,7 @@ module.exports = {
         }
 
         /**
-         * Checks wether a return statement is wrapped in ()
+         * Checks whether a return statement is wrapped in ()
          * @param {ASTNode} node node to examine
          * @returns {boolean} the result
          */
diff --git a/lib/rules/no-loss-of-precision.js b/lib/rules/no-loss-of-precision.js
index 9e2811809f6..2d0c6184220 100644
--- a/lib/rules/no-loss-of-precision.js
+++ b/lib/rules/no-loss-of-precision.js
@@ -105,9 +105,9 @@ module.exports = {
         }
 
         /**
-         * Converts an integer to to an object containing the the integer's coefficient and order of magnitude
+         * Converts an integer to to an object containing the integer's coefficient and order of magnitude
          * @param {string} stringInteger the string representation of the integer being converted
-         * @returns {Object} the object containing the the integer's coefficient and order of magnitude
+         * @returns {Object} the object containing the integer's coefficient and order of magnitude
          */
         function normalizeInteger(stringInteger) {
             const significantDigits = removeTrailingZeros(removeLeadingZeros(stringInteger));
@@ -120,9 +120,9 @@ module.exports = {
 
         /**
          *
-         * Converts a float to to an object containing the the floats's coefficient and order of magnitude
+         * Converts a float to to an object containing the floats's coefficient and order of magnitude
          * @param {string} stringFloat the string representation of the float being converted
-         * @returns {Object} the object containing the the integer's coefficient and order of magnitude
+         * @returns {Object} the object containing the integer's coefficient and order of magnitude
          */
         function normalizeFloat(stringFloat) {
             const trimmedFloat = removeLeadingZeros(stringFloat);
diff --git a/lib/rules/prefer-destructuring.js b/lib/rules/prefer-destructuring.js
index 413f7272cc1..f82bb75c122 100644
--- a/lib/rules/prefer-destructuring.js
+++ b/lib/rules/prefer-destructuring.js
@@ -168,7 +168,7 @@ module.exports = {
          * Assignment expression is not fixed.
          * Array destructuring is not fixed.
          * Renamed property is not fixed.
-         * @param {ASTNode} node the the node to evaluate
+         * @param {ASTNode} node the node to evaluate
          * @returns {boolean} whether or not the node should be fixed
          */
         function shouldFix(node) {
diff --git a/lib/rules/use-isnan.js b/lib/rules/use-isnan.js
index 53ffeb7e6d1..0c7e888c976 100644
--- a/lib/rules/use-isnan.js
+++ b/lib/rules/use-isnan.js
@@ -101,7 +101,7 @@ module.exports = {
         }
 
         /**
-         * Checks the the given `CallExpression` node for `.indexOf(NaN)` and `.lastIndexOf(NaN)`.
+         * Checks the given `CallExpression` node for `.indexOf(NaN)` and `.lastIndexOf(NaN)`.
          * @param {ASTNode} node The node to check.
          * @returns {void}
          */
diff --git a/tests/fixtures/config-extends/error.json b/tests/fixtures/config-extends/error.json
index c39795086e7..8b9a039b2e6 100644
--- a/tests/fixtures/config-extends/error.json
+++ b/tests/fixtures/config-extends/error.json
@@ -1,3 +1,3 @@
 {
-    "extends": "./non-existant.json"
+    "extends": "./non-existent.json"
 }
diff --git a/tests/lib/rules/indent.js b/tests/lib/rules/indent.js
index e7ad6074c49..02517ffaeeb 100644
--- a/tests/lib/rules/indent.js
+++ b/tests/lib/rules/indent.js
@@ -4145,7 +4145,7 @@ ruleTester.run("indent", rule, {
         //----------------------------------------------------------------------
         // JSX tests
         // https://github.com/eslint/eslint/issues/8425
-        // Some of the following tests are adapted from the the tests in eslint-plugin-react.
+        // Some of the following tests are adapted from the tests in eslint-plugin-react.
         // License: https://github.com/yannickcr/eslint-plugin-react/blob/7ca9841f22d599f447a27ef5b2a97def9229d6c8/LICENSE
         //----------------------------------------------------------------------
 
@@ -9845,7 +9845,7 @@ ruleTester.run("indent", rule, {
 
         //----------------------------------------------------------------------
         // JSX tests
-        // Some of the following tests are adapted from the the tests in eslint-plugin-react.
+        // Some of the following tests are adapted from the tests in eslint-plugin-react.
         // License: https://github.com/yannickcr/eslint-plugin-react/blob/7ca9841f22d599f447a27ef5b2a97def9229d6c8/LICENSE
         //----------------------------------------------------------------------
 
diff --git a/tests/lib/rules/no-restricted-exports.js b/tests/lib/rules/no-restricted-exports.js
index 31458f15fc1..ac0602a25b2 100644
--- a/tests/lib/rules/no-restricted-exports.js
+++ b/tests/lib/rules/no-restricted-exports.js
@@ -58,7 +58,7 @@ ruleTester.run("no-restricted-exports", rule, {
         { code: "export { a } from 'foo';", options: [{ restrictedNamedExports: ["x"] }] },
         { code: "export { b as a } from 'foo';", options: [{ restrictedNamedExports: ["x"] }] },
 
-        // does not mistakenly disallow non-exported identifers that appear in named export declarations
+        // does not mistakenly disallow non-exported identifiers that appear in named export declarations
         { code: "export var b = a;", options: [{ restrictedNamedExports: ["a"] }] },
         { code: "export let [b = a] = [];", options: [{ restrictedNamedExports: ["a"] }] },
         { code: "export const [b] = [a];", options: [{ restrictedNamedExports: ["a"] }] },