Switch linter from semistandard to biome

Uses the recommended rules apart from complexity/useArrowFunction,
which would affect about 1700 lines of code with little benefit
right now. This is something that can be addressed over time.

test/beforeEach.js

@@ -1,8 +1,6 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
 const sharp = require('../');
 
 const usingCache = !process.env.G_DEBUG;

test/bench/parallel.js

@@ -1,11 +1,9 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
 process.env.UV_THREADPOOL_SIZE = 64;
 
-const assert = require('assert');
+const assert = require('node:assert');
 const async = require('async');
 
 const sharp = require('../../');
@@ -21,13 +19,12 @@ const timer = setInterval(function () {
 }, 100);
 
 async.mapSeries([1, 1, 2, 4, 8, 16, 32, 64], function (parallelism, next) {
-  const start = new Date().getTime();
+  const start = Date.now();
   async.times(parallelism,
-    function (id, callback) {
-      /* jslint unused: false */
+    function (_id, callback) {
       sharp(fixtures.inputJpg).resize(width, height).toBuffer(function (err, buffer) {
         buffer = null;
-        callback(err, new Date().getTime() - start);
+        callback(err, Date.now() - start);
       });
     },
     function (err, ids) {
@@ -37,7 +34,7 @@ async.mapSeries([1, 1, 2, 4, 8, 16, 32, 64], function (parallelism, next) {
       const mean = ids.reduce(function (a, b) {
         return a + b;
       }) / ids.length;
-      console.log(parallelism + ' parallel calls: fastest=' + ids[0] + 'ms slowest=' + ids[ids.length - 1] + 'ms mean=' + mean + 'ms');
+      console.log(`${parallelism} parallel calls: fastest=${ids[0]}ms slowest=${ids[ids.length - 1]}ms mean=${mean}ms`);
       next();
     }
   );

test/bench/perf.js

@@ -1,10 +1,8 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const fs = require('fs');
-const { execSync } = require('child_process');
+const fs = require('node:fs');
+const { execSync } = require('node:child_process');
 
 const async = require('async');
 const Benchmark = require('benchmark');
@@ -12,7 +10,7 @@ const Benchmark = require('benchmark');
 const safeRequire = (name) => {
   try {
     return require(name);
-  } catch (err) {}
+  } catch (_err) {}
   return null;
 };
 
@@ -280,7 +278,7 @@ async.series({
           });
       }
     }).on('cycle', function (event) {
-      console.log('jpeg ' + String(event.target));
+      console.log(`jpeg ${String(event.target)}`);
     }).on('complete', function () {
       callback(null, this.filter('fastest').map('name'));
     }).run();
@@ -505,7 +503,7 @@ async.series({
           });
       }
     }).on('cycle', function (event) {
-      console.log('operations ' + String(event.target));
+      console.log(`operations ${String(event.target)}`);
     }).on('complete', function () {
       callback(null, this.filter('fastest').map('name'));
     }).run();
@@ -579,7 +577,7 @@ async.series({
           });
       }
     }).on('cycle', function (event) {
-      console.log('kernels ' + String(event.target));
+      console.log(`kernels ${String(event.target)}`);
     }).on('complete', function () {
       callback(null, this.filter('fastest').map('name'));
     }).run();
@@ -735,7 +733,7 @@ async.series({
         sharp(inputPngBuffer)
           .resize(width, heightPng)
           .png({ compressionLevel: 6 })
-          .toBuffer(function (err, data) {
+          .toBuffer(function (err) {
             if (err) {
               throw err;
             } else {
@@ -820,7 +818,7 @@ async.series({
       }
     });
     pngSuite.on('cycle', function (event) {
-      console.log(' png ' + String(event.target));
+      console.log(` png ${String(event.target)}`);
     }).on('complete', function () {
       callback(null, this.filter('fastest').map('name'));
     }).run();
@@ -881,7 +879,7 @@ async.series({
           });
       }
     }).on('cycle', function (event) {
-      console.log('webp ' + String(event.target));
+      console.log(`webp ${String(event.target)}`);
     }).on('complete', function () {
       callback(null, this.filter('fastest').map('name'));
     }).run();
@@ -892,7 +890,7 @@ async.series({
   }
   Object.keys(results).forEach(function (format) {
     if (results[format].toString().substr(0, 5) !== 'sharp') {
-      console.log('sharp was slower than ' + results[format] + ' for ' + format);
+      console.log(`sharp was slower than ${results[format]} for ${format}`);
     }
   });
   console.dir(sharp.cache());

test/bench/random.js

@@ -1,11 +1,9 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
 const imagemagick = require('imagemagick');
 const gm = require('gm');
-const assert = require('assert');
+const assert = require('node:assert');
 const Benchmark = require('benchmark');
 
 const sharp = require('../../');
@@ -73,5 +71,5 @@ new Benchmark.Suite('random').add('imagemagick', {
   console.log(String(event.target));
 }).on('complete', function () {
   const winner = this.filter('fastest').map('name');
-  assert.strictEqual('sharp', String(winner), 'sharp was slower than ' + winner);
+  assert.strictEqual('sharp', String(winner), `sharp was slower than ${winner}`);
 }).run();

test/fixtures/index.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const path = require('path');
+const path = require('node:path');
 const sharp = require('../../');
 const maxColourDistance = require('../../lib/sharp')._maxColourDistance;
 
@@ -196,10 +194,10 @@ module.exports = {
 
   assertMaxColourDistance: function (actualImagePath, expectedImagePath, acceptedDistance) {
     if (typeof actualImagePath !== 'string') {
-      throw new TypeError('`actualImagePath` must be a string; got ' + actualImagePath);
+      throw new TypeError(`\`actualImagePath\` must be a string; got ${actualImagePath}`);
     }
     if (typeof expectedImagePath !== 'string') {
-      throw new TypeError('`expectedImagePath` must be a string; got ' + expectedImagePath);
+      throw new TypeError(`\`expectedImagePath\` must be a string; got ${expectedImagePath}`);
     }
     if (typeof acceptedDistance !== 'number') {
       // Default threshold
@@ -207,7 +205,7 @@ module.exports = {
     }
     const distance = maxColourDistance(actualImagePath, expectedImagePath);
     if (distance > acceptedDistance) {
-      throw new Error('Expected maximum absolute distance of ' + acceptedDistance + ', actual ' + distance);
+      throw new Error(`Expected maximum absolute distance of ${acceptedDistance}, actual ${distance}`);
     }
   }
 

test/types/sharp.test-d.ts

@@ -1,6 +1,9 @@
+// biome-ignore-all lint/correctness/noUnusedFunctionParameters: types only test file
+// biome-ignore-all lint/correctness/noUnusedVariables: types only test file
+
 import sharp = require('../../');
 
-import { createReadStream, createWriteStream } from 'fs';
+import { createReadStream, createWriteStream } from 'node:fs';
 
 const input: Buffer = Buffer.alloc(0);
 const readableStream: NodeJS.ReadableStream = createReadStream(input);
@@ -79,7 +82,7 @@ sharp({
 let transformer = sharp()
   .resize(300)
   .on('info', (info: sharp.OutputInfo) => {
-    console.log('Image height is ' + info.height);
+    console.log(`Image height is ${info.height}`);
   });
 readableStream.pipe(transformer).pipe(writableStream);
 

test/unit/affine.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/alpha.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 const fixtures = require('../fixtures');
 const sharp = require('../../');
 
@@ -67,7 +65,7 @@ describe('Alpha transparency', function () {
   it('Do not flatten', function (done) {
     sharp(fixtures.inputPngWithTransparency)
       .flatten(false)
-      .toBuffer(function (err, data, info) {
+      .toBuffer(function (err, _data, info) {
         if (err) throw err;
         assert.strictEqual('png', info.format);
         assert.strictEqual(4, info.channels);
@@ -78,7 +76,7 @@ describe('Alpha transparency', function () {
   it('Ignored for JPEG', function (done) {
     sharp(fixtures.inputJpg)
       .flatten({ background: '#ff0000' })
-      .toBuffer(function (err, data, info) {
+      .toBuffer(function (err, _data, info) {
         if (err) throw err;
         assert.strictEqual('jpeg', info.format);
         assert.strictEqual(3, info.channels);
@@ -100,7 +98,7 @@ describe('Alpha transparency', function () {
 
   it('Enlargement with non-nearest neighbor interpolation shouldn’t cause dark edges', function () {
     const base = 'alpha-premultiply-enlargement-2048x1536-paper.png';
-    const actual = fixtures.path('output.' + base);
+    const actual = fixtures.path(`output.${base}`);
     const expected = fixtures.expected(base);
     return sharp(fixtures.inputPngAlphaPremultiplicationSmall)
       .resize(2048, 1536)
@@ -112,7 +110,7 @@ describe('Alpha transparency', function () {
 
   it('Reduction with non-nearest neighbor interpolation shouldn’t cause dark edges', function () {
     const base = 'alpha-premultiply-reduction-1024x768-paper.png';
-    const actual = fixtures.path('output.' + base);
+    const actual = fixtures.path(`output.${base}`);
     const expected = fixtures.expected(base);
     return sharp(fixtures.inputPngAlphaPremultiplicationLarge)
       .resize(1024, 768)

test/unit/avif.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const { inputAvif, inputJpg, inputGifAnimated } = require('../fixtures');
@@ -20,8 +18,8 @@ describe('AVIF', () => {
       .resize(32)
       .jpeg()
       .toBuffer();
-    const { size, ...metadata } = await sharp(data)
-      .metadata();
+    const { size, ...metadata } = await sharp(data).metadata();
+    void size;
     assert.deepStrictEqual(metadata, {
       autoOrient: {
         height: 13,
@@ -49,8 +47,8 @@ describe('AVIF', () => {
       .resize(32)
       .avif({ effort: 0 })
       .toBuffer();
-    const { size, ...metadata } = await sharp(data)
-      .metadata();
+    const { size, ...metadata } = await sharp(data).metadata();
+    void size;
     assert.deepStrictEqual(metadata, {
       autoOrient: {
         height: 26,
@@ -77,8 +75,8 @@ describe('AVIF', () => {
     const data = await sharp(inputAvif)
       .resize(32)
       .toBuffer();
-    const { size, ...metadata } = await sharp(data)
-      .metadata();
+    const { size, ...metadata } = await sharp(data).metadata();
+    void size;
     assert.deepStrictEqual(metadata, {
       autoOrient: {
         height: 13,
@@ -106,8 +104,8 @@ describe('AVIF', () => {
       .resize(10)
       .avif({ effort: 0 })
       .toBuffer();
-    const { size, ...metadata } = await sharp(data)
-      .metadata();
+    const { size, ...metadata } = await sharp(data).metadata();
+    void size;
     assert.deepStrictEqual(metadata, {
       autoOrient: {
         height: 300,
@@ -136,8 +134,8 @@ describe('AVIF', () => {
       .sharpen()
       .avif({ effort: 0 })
       .toBuffer();
-    const { size, ...metadata } = await sharp(data)
-      .metadata();
+    const { size, ...metadata } = await sharp(data).metadata();
+    void size;
     assert.deepStrictEqual(metadata, {
       autoOrient: {
         height: 26,

test/unit/bandbool.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 const fixtures = require('../fixtures');
 const sharp = require('../../');
 
@@ -14,7 +12,7 @@ describe('Bandbool per-channel boolean operations', function () {
     sharp.bool.eor
   ]
     .forEach(function (op) {
-      it(op + ' operation', function (done) {
+      it(`${op} operation`, function (done) {
         sharp(fixtures.inputPngBooleanNoAlpha)
           .bandbool(op)
           .toColourspace('b-w')
@@ -23,7 +21,7 @@ describe('Bandbool per-channel boolean operations', function () {
             assert.strictEqual(200, info.width);
             assert.strictEqual(200, info.height);
             assert.strictEqual(1, info.channels);
-            fixtures.assertSimilar(fixtures.expected('bandbool_' + op + '_result.png'), data, done);
+            fixtures.assertSimilar(fixtures.expected(`bandbool_${op}_result.png`), data, done);
           });
       });
     });
@@ -31,7 +29,7 @@ describe('Bandbool per-channel boolean operations', function () {
   it('sRGB image retains 3 channels', function (done) {
     sharp(fixtures.inputJpg)
       .bandbool('and')
-      .toBuffer(function (err, data, info) {
+      .toBuffer(function (err, _data, info) {
         if (err) throw err;
         assert.strictEqual(3, info.channels);
         done();

test/unit/blur.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/boolean.js

@@ -1,10 +1,8 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const fs = require('fs');
-const assert = require('assert');
+const fs = require('node:fs');
+const assert = require('node:assert');
 
 const fixtures = require('../fixtures');
 const sharp = require('../../');
@@ -18,7 +16,7 @@ describe('Boolean operation between two images', function () {
     sharp.bool.eor
   ]
     .forEach(function (op) {
-      it(op + ' operation, file', function (done) {
+      it(`${op} operation, file`, function (done) {
         sharp(fixtures.inputJpg)
           .resize(320, 240)
           .boolean(fixtures.inputJpgBooleanTest, op)
@@ -26,11 +24,11 @@ describe('Boolean operation between two images', function () {
             if (err) throw err;
             assert.strictEqual(320, info.width);
             assert.strictEqual(240, info.height);
-            fixtures.assertSimilar(fixtures.expected('boolean_' + op + '_result.jpg'), data, done);
+            fixtures.assertSimilar(fixtures.expected(`boolean_${op}_result.jpg`), data, done);
           });
       });
 
-      it(op + ' operation, buffer', function (done) {
+      it(`${op} operation, buffer`, function (done) {
         sharp(fixtures.inputJpg)
           .resize(320, 240)
           .boolean(inputJpgBooleanTestBuffer, op)
@@ -38,11 +36,11 @@ describe('Boolean operation between two images', function () {
             if (err) throw err;
             assert.strictEqual(320, info.width);
             assert.strictEqual(240, info.height);
-            fixtures.assertSimilar(fixtures.expected('boolean_' + op + '_result.jpg'), data, done);
+            fixtures.assertSimilar(fixtures.expected(`boolean_${op}_result.jpg`), data, done);
           });
       });
 
-      it(op + ' operation, raw', function (done) {
+      it(`${op} operation, raw`, function (done) {
         sharp(fixtures.inputJpgBooleanTest)
           .raw()
           .toBuffer(function (err, data, info) {
@@ -54,7 +52,7 @@ describe('Boolean operation between two images', function () {
                 if (err) throw err;
                 assert.strictEqual(320, info.width);
                 assert.strictEqual(240, info.height);
-                fixtures.assertSimilar(fixtures.expected('boolean_' + op + '_result.jpg'), data, done);
+                fixtures.assertSimilar(fixtures.expected(`boolean_${op}_result.jpg`), data, done);
               });
           });
       });

test/unit/clahe.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../lib');
 const fixtures = require('../fixtures');

test/unit/clone.js

@@ -1,10 +1,8 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const fs = require('fs');
-const assert = require('assert');
+const fs = require('node:fs');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/colourspace.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/composite.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const fixtures = require('../fixtures');
 const sharp = require('../../');
@@ -322,7 +320,7 @@ describe('composite', () => {
   describe('string gravity', () => {
     Object.keys(sharp.gravity).forEach(gravity => {
       it(gravity, done => {
-        const expected = fixtures.expected('overlay-gravity-' + gravity + '.jpg');
+        const expected = fixtures.expected(`overlay-gravity-${gravity}.jpg`);
         sharp(fixtures.inputJpg)
           .resize(80)
           .composite([{
@@ -344,7 +342,7 @@ describe('composite', () => {
   describe('tile and gravity', () => {
     Object.keys(sharp.gravity).forEach(gravity => {
       it(gravity, done => {
-        const expected = fixtures.expected('overlay-tile-gravity-' + gravity + '.jpg');
+        const expected = fixtures.expected(`overlay-tile-gravity-${gravity}.jpg`);
         sharp(fixtures.inputJpg)
           .resize(80)
           .composite([{

test/unit/convolve.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/dilate.js

@@ -1,6 +1,4 @@
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/erode.js

@@ -1,6 +1,4 @@
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/extend.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/extract.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/extractChannel.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/failOn.js

@@ -1,10 +1,8 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
-const fs = require('fs');
+const assert = require('node:assert');
+const fs = require('node:fs');
 
 const sharp = require('../../lib');
 const fixtures = require('../fixtures');
@@ -32,7 +30,7 @@ describe('failOn', () => {
         isWarningEmitted = true;
       })
       .resize(32, 24)
-      .toBuffer(function (err, data, info) {
+      .toBuffer(function (err, _data, info) {
         if (err) throw err;
         assert.strictEqual(true, isWarningEmitted);
         assert.strictEqual('png', info.format);

test/unit/fixtures.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 const fixtures = require('../fixtures');
 
 describe('Test fixtures', function () {

test/unit/gamma.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/gif.js

@@ -1,10 +1,8 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const fs = require('fs');
-const assert = require('assert');
+const fs = require('node:fs');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/heif.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 

test/unit/io.js

@@ -1,11 +1,9 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const fs = require('fs');
-const path = require('path');
-const assert = require('assert');
+const fs = require('node:fs');
+const path = require('node:path');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');
@@ -388,9 +386,8 @@ describe('Input/output', function () {
   });
 
   it('Fail when output File is input File via Promise', function (done) {
-    sharp(fixtures.inputJpg).toFile(fixtures.inputJpg).then(function (data) {
-      assert(false);
-      done();
+    sharp(fixtures.inputJpg).toFile(fixtures.inputJpg).then(function () {
+      done(new Error('Unexpectedly resolved Promise'));
     }).catch(function (err) {
       assert(err instanceof Error);
       assert.strictEqual('Cannot use same file for input and output', err.message);
@@ -409,9 +406,8 @@ describe('Input/output', function () {
 
   it('Fail when output File is input File via Promise (relative output, absolute input)', function (done) {
     const relativePath = path.relative(process.cwd(), fixtures.inputJpg);
-    sharp(fixtures.inputJpg).toFile(relativePath).then(function (data) {
-      assert(false);
-      done();
+    sharp(fixtures.inputJpg).toFile(relativePath).then(function () {
+      done(new Error('Unexpectedly resolved Promise'));
     }).catch(function (err) {
       assert(err instanceof Error);
       assert.strictEqual('Cannot use same file for input and output', err.message);
@@ -430,9 +426,8 @@ describe('Input/output', function () {
 
   it('Fail when output File is input File via Promise (relative input, absolute output)', function (done) {
     const relativePath = path.relative(process.cwd(), fixtures.inputJpg);
-    sharp(relativePath).toFile(fixtures.inputJpg).then(function (data) {
-      assert(false);
-      done();
+    sharp(relativePath).toFile(fixtures.inputJpg).then(function () {
+      done(new Error('Unexpectedly resolved Promise'));
     }).catch(function (err) {
       assert(err instanceof Error);
       assert.strictEqual('Cannot use same file for input and output', err.message);
@@ -449,9 +444,8 @@ describe('Input/output', function () {
   });
 
   it('Fail when output File is empty via Promise', function (done) {
-    sharp(fixtures.inputJpg).toFile('').then(function (data) {
-      assert(false);
-      done();
+    sharp(fixtures.inputJpg).toFile('').then(function () {
+      done(new Error('Unexpectedly resolved Promise'));
     }).catch(function (err) {
       assert(err instanceof Error);
       assert.strictEqual('Missing output file path', err.message);
@@ -522,7 +516,7 @@ describe('Input/output', function () {
     try {
       sharp().toFormat('zoinks');
       isValid = true;
-    } catch (e) {}
+    } catch (_err) {}
     assert(!isValid);
     done();
   });
@@ -633,7 +627,7 @@ describe('Input/output', function () {
     sharp(fixtures.inputJpg)
       .resize(320, 240)
       .png({ compressionLevel: 1, force: false })
-      .toBuffer(function (err, data, info) {
+      .toBuffer(function (err, _data, info) {
         if (err) throw err;
         assert.strictEqual('jpeg', info.format);
         assert.strictEqual(320, info.width);
@@ -1059,7 +1053,7 @@ describe('Input/output', function () {
       });
     const badPipeline = sharp({ raw: { width: 840, height: 500, channels: 3 } })
       .toFormat('jpeg')
-      .toBuffer(function (err, data, info) {
+      .toBuffer(function (err) {
         assert.strictEqual(err.message.indexOf('memory area too small') > 0, true);
         const readable = fs.createReadStream(fixtures.inputJPGBig);
         const inPipeline = sharp()
@@ -1067,10 +1061,7 @@ describe('Input/output', function () {
           .raw();
         const goodPipeline = sharp({ raw: { width: 840, height: 472, channels: 3 } })
           .toFormat('jpeg')
-          .toBuffer(function (err, data, info) {
-            if (err) throw err;
-            done();
-          });
+          .toBuffer(done);
         readable.pipe(inPipeline).pipe(goodPipeline);
       });
     readable.pipe(inPipeline).pipe(badPipeline);

test/unit/join.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/joinChannel.js

@@ -1,10 +1,8 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
-const fs = require('fs');
+const assert = require('node:assert');
+const fs = require('node:fs');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/jp2.js

@@ -1,10 +1,8 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const fs = require('fs');
-const assert = require('assert');
+const fs = require('node:fs');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/jpeg.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/jxl.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 

test/unit/libvips.js

@@ -1,10 +1,8 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
-const fs = require('fs');
+const assert = require('node:assert');
+const fs = require('node:fs');
 const semver = require('semver');
 const libvips = require('../../lib/libvips');
 

test/unit/linear.js

@@ -1,12 +1,10 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
 const sharp = require('../../');
 const fixtures = require('../fixtures');
 
-const assert = require('assert');
+const assert = require('node:assert');
 
 describe('Linear adjustment', function () {
   const blackPoint = 70;
@@ -17,7 +15,7 @@ describe('Linear adjustment', function () {
   it('applies linear levels adjustment w/o alpha ch', function (done) {
     sharp(fixtures.inputJpgWithLowContrast)
       .linear(a, b)
-      .toBuffer(function (err, data, info) {
+      .toBuffer(function (err, data) {
         if (err) throw err;
         fixtures.assertSimilar(fixtures.expected('low-contrast-linear.jpg'), data, done);
       });
@@ -26,7 +24,7 @@ describe('Linear adjustment', function () {
   it('applies slope level adjustment w/o alpha ch', function (done) {
     sharp(fixtures.inputJpgWithLowContrast)
       .linear(a)
-      .toBuffer(function (err, data, info) {
+      .toBuffer(function (err, data) {
         if (err) throw err;
         fixtures.assertSimilar(fixtures.expected('low-contrast-slope.jpg'), data, done);
       });
@@ -35,7 +33,7 @@ describe('Linear adjustment', function () {
   it('applies offset level adjustment w/o alpha ch', function (done) {
     sharp(fixtures.inputJpgWithLowContrast)
       .linear(null, b)
-      .toBuffer(function (err, data, info) {
+      .toBuffer(function (err, data) {
         if (err) throw err;
         fixtures.assertSimilar(fixtures.expected('low-contrast-offset.jpg'), data, done);
       });
@@ -83,7 +81,7 @@ describe('Linear adjustment', function () {
 
   it('per channel level adjustment', function (done) {
     sharp(fixtures.inputWebP)
-      .linear([0.25, 0.5, 0.75], [150, 100, 50]).toBuffer(function (err, data, info) {
+      .linear([0.25, 0.5, 0.75], [150, 100, 50]).toBuffer(function (err, data) {
         if (err) throw err;
         fixtures.assertSimilar(fixtures.expected('linear-per-channel.jpg'), data, done);
       });

test/unit/median.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 

test/unit/metadata.js

@@ -1,10 +1,8 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const fs = require('fs');
-const assert = require('assert');
+const fs = require('node:fs');
+const assert = require('node:assert');
 const exifReader = require('exif-reader');
 const icc = require('icc');
 
@@ -756,7 +754,7 @@ describe('Image metadata', function () {
     sharp(fixtures.inputJpg)
       .resize(64)
       .withIccProfile(fixtures.path('hilutite.icm'))
-      .toFile(output, function (err, info) {
+      .toFile(output, function (err) {
         if (err) throw err;
         fixtures.assertMaxColourDistance(output, fixtures.expected('hilutite.jpg'), 9);
         done();

test/unit/modulate.js

@@ -1,10 +1,8 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
 const sharp = require('../../');
-const assert = require('assert');
+const assert = require('node:assert');
 const fixtures = require('../fixtures');
 
 describe('Modulate', function () {

test/unit/negate.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');
@@ -104,7 +102,7 @@ describe('Negate', function () {
     const output = fixtures.path('output.unmodified-by-negate.png');
     sharp(fixtures.inputJpgWithLowContrast)
       .negate(false)
-      .toFile(output, function (err, info) {
+      .toFile(output, function (err) {
         if (err) throw err;
         fixtures.assertMaxColourDistance(output, fixtures.inputJpgWithLowContrast, 0);
         done();

test/unit/noise.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/normalize.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');
@@ -24,7 +22,7 @@ describe('Normalization', function () {
     sharp(fixtures.inputJpgWithLowContrast)
       .normalise()
       .raw()
-      .toBuffer(function (err, data, info) {
+      .toBuffer(function (err, data) {
         if (err) throw err;
         assertNormalized(data);
         done();
@@ -36,7 +34,7 @@ describe('Normalization', function () {
       .greyscale()
       .normalize()
       .raw()
-      .toBuffer(function (err, data, info) {
+      .toBuffer(function (err, data) {
         if (err) throw err;
         assertNormalized(data);
         done();
@@ -47,7 +45,7 @@ describe('Normalization', function () {
     sharp(fixtures.inputPngWithGreyAlpha)
       .normalise()
       .raw()
-      .toBuffer(function (err, data, info) {
+      .toBuffer(function (err, data) {
         if (err) throw err;
         assertNormalized(data);
         done();
@@ -90,7 +88,7 @@ describe('Normalization', function () {
     const output = fixtures.path('output.unmodified-png-with-one-color.png');
     sharp(fixtures.inputPngWithOneColor)
       .normalize()
-      .toFile(output, function (err, info) {
+      .toFile(output, function (err) {
         if (err) done(err);
         fixtures.assertMaxColourDistance(output, fixtures.inputPngWithOneColor, 0);
         done();
@@ -101,7 +99,7 @@ describe('Normalization', function () {
     sharp(fixtures.inputPngWithTransparency16bit)
       .normalise()
       .raw()
-      .toBuffer(function (err, data, info) {
+      .toBuffer(function (err, data) {
         if (err) throw err;
         assertNormalized(data);
         done();
@@ -112,7 +110,7 @@ describe('Normalization', function () {
     sharp(fixtures.inputJpgWithLowContrast)
       .normalise({ lower: 10, upper: 70 })
       .raw()
-      .toBuffer(function (err, data, info) {
+      .toBuffer(function (err, data) {
         if (err) throw err;
         assertNormalized(data);
         done();

test/unit/png.js

@@ -1,10 +1,8 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const fs = require('fs');
-const assert = require('assert');
+const fs = require('node:fs');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');
@@ -137,6 +135,7 @@ describe('PNG', function () {
       .toBuffer();
 
     const { size, ...metadata } = await sharp(data).metadata();
+    void size;
     assert.deepStrictEqual(metadata, {
       autoOrient: {
         height: 68,

test/unit/raw.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');
@@ -200,7 +198,7 @@ describe('Raw pixel data', function () {
       });
       writable
         .jpeg()
-        .toBuffer(function (err, data, info) {
+        .toBuffer(function (err, _data, info) {
           if (err) throw err;
           assert.strictEqual('jpeg', info.format);
           assert.strictEqual(32, info.width);
@@ -285,20 +283,20 @@ describe('Raw pixel data', function () {
       });
     });
 
-    for (const { constructor, depth, bits } of [
-      { constructor: Uint8Array, depth: undefined, bits: 8 },
-      { constructor: Uint8Array, depth: 'uchar', bits: 8 },
-      { constructor: Uint8ClampedArray, depth: 'uchar', bits: 8 },
-      { constructor: Int8Array, depth: 'char', bits: 8 },
-      { constructor: Uint16Array, depth: 'ushort', bits: 16 },
-      { constructor: Int16Array, depth: 'short', bits: 16 },
-      { constructor: Uint32Array, depth: 'uint', bits: 32 },
-      { constructor: Int32Array, depth: 'int', bits: 32 },
-      { constructor: Float32Array, depth: 'float', bits: 32 },
-      { constructor: Float64Array, depth: 'double', bits: 64 }
+    for (const { type, depth, bits } of [
+      { type: Uint8Array, depth: undefined, bits: 8 },
+      { type: Uint8Array, depth: 'uchar', bits: 8 },
+      { type: Uint8ClampedArray, depth: 'uchar', bits: 8 },
+      { type: Int8Array, depth: 'char', bits: 8 },
+      { type: Uint16Array, depth: 'ushort', bits: 16 },
+      { type: Int16Array, depth: 'short', bits: 16 },
+      { type: Uint32Array, depth: 'uint', bits: 32 },
+      { type: Int32Array, depth: 'int', bits: 32 },
+      { type: Float32Array, depth: 'float', bits: 32 },
+      { type: Float64Array, depth: 'double', bits: 64 }
     ]) {
-      it(constructor.name, () =>
-        sharp(new constructor(3), { raw: { width: 1, height: 1, channels: 3 } })
+      it(type.name, () =>
+        sharp(new type(3), { raw: { width: 1, height: 1, channels: 3 } })
           .raw({ depth })
           .toBuffer({ resolveWithObject: true })
           .then(({ data, info }) => {

test/unit/recomb.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/resize-contain.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/resize-cover.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/resize.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');
@@ -129,7 +127,7 @@ describe('Resize dimensions', function () {
       .resize(0x4000, 0x4000)
       .extract({ top: 0x2000, left: 0x2000, width: 256, height: 256 })
       .webp()
-      .toBuffer(function (err, data, info) {
+      .toBuffer(function (err, _data, info) {
         if (err) throw err;
         assert.strictEqual('webp', info.format);
         assert.strictEqual(256, info.width);
@@ -149,7 +147,7 @@ describe('Resize dimensions', function () {
         assert.strictEqual(607, info.height);
         sharp(data)
           .resize(233, 131)
-          .toBuffer(function (err, data, info) {
+          .toBuffer(function (err, _data, info) {
             if (err) throw err;
             assert.strictEqual('webp', info.format);
             assert.strictEqual(233, info.width);
@@ -169,7 +167,7 @@ describe('Resize dimensions', function () {
         sharp(data)
           .rotate(90)
           .resize(533, 800)
-          .toBuffer(function (err, data, info) {
+          .toBuffer(function (err, _data, info) {
             if (err) throw err;
             assert.strictEqual(533, info.width);
             assert.strictEqual(800, info.height);
@@ -660,7 +658,7 @@ describe('Resize dimensions', function () {
     sharp(fixtures.inputTiff8BitDepth)
       .resize(210, 210, { kernel: 'nearest' })
       .png()
-      .toBuffer(function (err, data, info) {
+      .toBuffer(function (err, _data, info) {
         if (err) throw err;
         assert.strictEqual(210, info.width);
         assert.strictEqual(210, info.height);

test/unit/rotate.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');
@@ -173,8 +171,8 @@ describe('Rotation', function () {
   });
 
   [-3690, -450, -90, 90, 450, 3690].forEach(function (angle) {
-    it('Rotate by any 90-multiple angle (' + angle + 'deg)', function (done) {
-      sharp(fixtures.inputJpg320x240).rotate(angle).toBuffer(function (err, data, info) {
+    it(`Rotate by any 90-multiple angle (${angle}deg)`, function (done) {
+      sharp(fixtures.inputJpg320x240).rotate(angle).toBuffer(function (err, _data, info) {
         if (err) throw err;
         assert.strictEqual(240, info.width);
         assert.strictEqual(320, info.height);
@@ -184,8 +182,8 @@ describe('Rotation', function () {
   });
 
   [-3750, -510, -150, 30, 390, 3630].forEach(function (angle) {
-    it('Rotate by any 30-multiple angle (' + angle + 'deg)', function (done) {
-      sharp(fixtures.inputJpg320x240).rotate(angle).toBuffer(function (err, data, info) {
+    it(`Rotate by any 30-multiple angle (${angle}deg)`, function (done) {
+      sharp(fixtures.inputJpg320x240).rotate(angle).toBuffer(function (err, _data, info) {
         if (err) throw err;
         assert.strictEqual(397, info.width);
         assert.strictEqual(368, info.height);
@@ -195,8 +193,8 @@ describe('Rotation', function () {
   });
 
   [-3780, -540, 0, 180, 540, 3780].forEach(function (angle) {
-    it('Rotate by any 180-multiple angle (' + angle + 'deg)', function (done) {
-      sharp(fixtures.inputJpg320x240).rotate(angle).toBuffer(function (err, data, info) {
+    it(`Rotate by any 180-multiple angle (${angle}deg)`, function (done) {
+      sharp(fixtures.inputJpg320x240).rotate(angle).toBuffer(function (err, _data, info) {
         if (err) throw err;
         assert.strictEqual(320, info.width);
         assert.strictEqual(240, info.height);
@@ -446,7 +444,7 @@ describe('Rotation', function () {
     sharp(fixtures.inputJpg)
       .rotate(45)
       .rotate(90)
-      .toBuffer(function (err, data, info) {
+      .toBuffer(function (err, _data, info) {
         if (err) throw err;
         assert.strictEqual(2225, info.width);
         assert.strictEqual(2725, info.height);
@@ -458,7 +456,7 @@ describe('Rotation', function () {
     sharp(fixtures.inputJpg)
       .rotate(90)
       .rotate(45)
-      .toBuffer(function (err, data, info) {
+      .toBuffer(function (err, _data, info) {
         if (err) throw err;
         assert.strictEqual(3500, info.width);
         assert.strictEqual(3500, info.height);

test/unit/sharpen.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/stats.js

@@ -1,10 +1,8 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const fs = require('fs');
-const assert = require('assert');
+const fs = require('node:fs');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');
@@ -711,7 +709,7 @@ describe('Image Stats', function () {
 
   it('File input with corrupt header fails gracefully, Promise out', function () {
     return sharp(fixtures.inputJpgWithCorruptHeader)
-      .stats().then(function (stats) {
+      .stats().then(function () {
         throw new Error('Corrupt Header file');
       }).catch(function (err) {
         assert.ok(!!err);
@@ -724,7 +722,7 @@ describe('Image Stats', function () {
     fs.createReadStream(fixtures.inputJpgWithCorruptHeader).pipe(pipeline);
 
     return pipeline
-      .stats().then(function (stats) {
+      .stats().then(function () {
         throw new Error('Corrupt Header file');
       }).catch(function (err) {
         assert.ok(!!err);
@@ -740,7 +738,7 @@ describe('Image Stats', function () {
   });
 
   it('Non-existent file in, Promise out', function (done) {
-    sharp('fail').stats().then(function (stats) {
+    sharp('fail').stats().then(function () {
       throw new Error('Non-existent file');
     }, function (err) {
       assert.ok(!!err);

test/unit/svg.js

@@ -1,10 +1,8 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const fs = require('fs');
-const assert = require('assert');
+const fs = require('node:fs');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/text.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/threshold.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');
@@ -64,7 +62,7 @@ describe('Threshold', function () {
   it('threshold false (=0)', function (done) {
     sharp(fixtures.inputJpg)
       .threshold(false)
-      .toBuffer(function (err, data, info) {
+      .toBuffer(function (err, data) {
         if (err) throw err;
         fixtures.assertSimilar(fixtures.inputJpg, data, done);
       });

test/unit/tiff.js

@@ -1,10 +1,8 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const fs = require('fs');
-const assert = require('assert');
+const fs = require('node:fs');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/tile.js

@@ -1,11 +1,9 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const fs = require('fs');
-const path = require('path');
-const assert = require('assert');
+const fs = require('node:fs');
+const path = require('node:path');
+const assert = require('node:assert');
 
 const extractZip = require('extract-zip');
 
@@ -47,7 +45,7 @@ const assertDeepZoomTiles = function (directory, expectedSize, expectedLevels, d
     .catch(done);
 };
 
-const assertZoomifyTiles = function (directory, expectedTileSize, expectedLevels, done) {
+const assertZoomifyTiles = function (directory, expectedLevels, done) {
   fs.stat(path.join(directory, 'ImageProperties.xml'), function (err, stat) {
     if (err) throw err;
     assert.ok(stat.isFile());
@@ -57,7 +55,7 @@ const assertZoomifyTiles = function (directory, expectedTileSize, expectedLevels
     fs.readdirSync(path.join(directory, 'TileGroup0')).forEach(function (tile) {
       // Verify tile file name
       assert.ok(/^[0-9]+-[0-9]+-[0-9]+\.jpg$/.test(tile));
-      const level = parseInt(tile.split('-')[0]);
+      const level = Number(tile.split('-')[0]);
       maxTileLevel = Math.max(maxTileLevel, level);
     });
 
@@ -67,7 +65,7 @@ const assertZoomifyTiles = function (directory, expectedTileSize, expectedLevels
   });
 };
 
-const assertGoogleTiles = function (directory, expectedTileSize, expectedLevels, done) {
+const assertGoogleTiles = function (directory, expectedLevels, done) {
   // Get levels
   const dirents = fs.readdirSync(directory, { withFileTypes: true });
   const levels = dirents.filter(dirent => dirent.isDirectory()).map(dirent => dirent.name);
@@ -411,7 +409,7 @@ describe('Tile', function () {
             size: 512,
             depth: 'one'
           })
-          .toFile(fixtures.path('output.512_depth_one.dzi'), function (err, info) {
+          .toFile(fixtures.path('output.512_depth_one.dzi'), function (err) {
             if (err) throw err;
             // Verify only one depth generated
             assertDeepZoomTiles(directory, 512, 1, done);
@@ -427,7 +425,7 @@ describe('Tile', function () {
             size: 512,
             depth: 'onepixel'
           })
-          .toFile(fixtures.path('output.512_depth_onepixel.dzi'), function (err, info) {
+          .toFile(fixtures.path('output.512_depth_onepixel.dzi'), function (err) {
             if (err) throw err;
             // Verify only one depth generated
             assertDeepZoomTiles(directory, 512, 13, done);
@@ -443,7 +441,7 @@ describe('Tile', function () {
             size: 256,
             depth: 'onetile'
           })
-          .toFile(fixtures.path('output.256_depth_onetile.dzi'), function (err, info) {
+          .toFile(fixtures.path('output.256_depth_onetile.dzi'), function (err) {
             if (err) throw err;
             // Verify only one depth generated
             assertDeepZoomTiles(directory, 256, 5, done);
@@ -459,7 +457,7 @@ describe('Tile', function () {
             size: 256,
             skipBlanks: 0
           })
-          .toFile(fixtures.path('output.256_skip_blanks.dzi'), function (err, info) {
+          .toFile(fixtures.path('output.256_skip_blanks.dzi'), function (err) {
             if (err) throw err;
             // assert them 0_0.jpeg doesn't exist because it's a white tile
             const whiteTilePath = path.join(directory, '11', '0_0.jpeg');
@@ -510,7 +508,7 @@ describe('Tile', function () {
             assert.strictEqual(2225, info.height);
             assert.strictEqual(3, info.channels);
             assert.strictEqual(undefined, info.size);
-            assertZoomifyTiles(directory, 256, 1, done);
+            assertZoomifyTiles(directory, 1, done);
           });
       });
     });
@@ -531,7 +529,7 @@ describe('Tile', function () {
             assert.strictEqual(2225, info.height);
             assert.strictEqual(3, info.channels);
             assert.strictEqual(undefined, info.size);
-            assertZoomifyTiles(directory, 256, 5, done);
+            assertZoomifyTiles(directory, 5, done);
           });
       });
     });
@@ -552,7 +550,7 @@ describe('Tile', function () {
             assert.strictEqual(2225, info.height);
             assert.strictEqual(3, info.channels);
             assert.strictEqual(undefined, info.size);
-            assertZoomifyTiles(directory, 256, 13, done);
+            assertZoomifyTiles(directory, 13, done);
           });
       });
     });
@@ -576,7 +574,7 @@ describe('Tile', function () {
             assert.strictEqual(1536, info.height);
             assert.strictEqual(3, info.channels);
             assert.strictEqual(undefined, info.size);
-            assertZoomifyTiles(directory, 256, 4, done);
+            assertZoomifyTiles(directory, 4, done);
           });
       });
     });
@@ -733,7 +731,7 @@ describe('Tile', function () {
             assert.strictEqual(2225, info.height);
             assert.strictEqual(3, info.channels);
             assert.strictEqual(undefined, info.size);
-            assertGoogleTiles(directory, 256, 1, done);
+            assertGoogleTiles(directory, 1, done);
           });
       });
     });
@@ -754,7 +752,7 @@ describe('Tile', function () {
             assert.strictEqual(2225, info.height);
             assert.strictEqual(3, info.channels);
             assert.strictEqual(undefined, info.size);
-            assertGoogleTiles(directory, 256, 5, done);
+            assertGoogleTiles(directory, 5, done);
           });
       });
     });
@@ -778,7 +776,7 @@ describe('Tile', function () {
             assert.strictEqual(2074, info.height);
             assert.strictEqual(3, info.channels);
             assert.strictEqual(undefined, info.size);
-            assertGoogleTiles(directory, 256, 5, done);
+            assertGoogleTiles(directory, 5, done);
           });
       });
     });

test/unit/timeout.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/tint.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/toBuffer.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');

test/unit/toFormat.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 const sharp = require('../../');
 const fixtures = require('../fixtures');
 

test/unit/trim.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const inRange = require('../../lib/is').inRange;

test/unit/unflatten.js

@@ -1,8 +1,6 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
 const sharp = require('../../');
 const fixtures = require('../fixtures');
 

test/unit/util.js

@@ -1,9 +1,7 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const assert = require('assert');
+const assert = require('node:assert');
 const semver = require('semver');
 const sharp = require('../../');
 

test/unit/webp.js

@@ -1,10 +1,8 @@
 // Copyright 2013 Lovell Fuller and others.
 // SPDX-License-Identifier: Apache-2.0
 
-'use strict';
-
-const fs = require('fs');
-const assert = require('assert');
+const fs = require('node:fs');
+const assert = require('node:assert');
 
 const sharp = require('../../');
 const fixtures = require('../fixtures');