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feat(fs): Make parameters optional for readSync #32460

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lholmquist wants to merge 4 commits into from
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feat(fs): Make parameters optional for readSync #32460

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c91f09e
fs: Make parameters optional for readSync
lholmquist Mar 24, 2020
7115ba9
squash: fix typo
lholmquist Mar 24, 2020
c2bb51b
squash: fix up tests
lholmquist Mar 25, 2020
7f68e77
squash: update docs
lholmquist Mar 26, 2020
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squash: fix up tests
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@lholmquist
lholmquist committed Mar 30, 2020
commit c2bb51bd281941d947d29ccfdb743dbd9651e0b5
4 changes: 1 addition & 3 deletions lib/fs.js
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Original file line number Diff line number Diff line change
Expand Up @@ -544,9 +544,7 @@ function readSync(fd, buffer, offset, length, position) {
// Assume fs.read(fd, buffer, options)
const options = offset || {};

offset = options.offset || 0;
length = options.length || buffer.length;
position = options.position;
({ offset = 0, length = buffer.length, position } = options);
}

validateBuffer(buffer);
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29 changes: 11 additions & 18 deletions test/parallel/test-fs-readSync-optional-params.js
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Expand Up @@ -8,27 +8,20 @@ const filepath = fixtures.path('x.txt');
const fd = fs.openSync(filepath, 'r');

const expected = Buffer.from('xyz\n');
const defaultBuffer1 = Buffer.allocUnsafe(expected.length);
const defaultBuffer2 = Buffer.allocUnsafe(expected.length);
const defaultBuffer3 = Buffer.allocUnsafe(expected.length);

function runTest(defaultBuffer, options) {
const result = fs.readSync(fd, defaultBuffer, options);
assert.strictEqual(result, expected.length);
assert.deepStrictEqual(defaultBuffer, expected);
}

// Test passing in an empty options object
const result1 = fs.readSync(fd, defaultBuffer1, { position: 0 });
assert.strictEqual(result1, expected.length);
assert.deepStrictEqual(defaultBuffer1, expected);
runTest(Buffer.allocUnsafe(expected.length), { position: 0 });

// Test not passing in any options object
const result2 = fs.readSync(fd, defaultBuffer2);
assert.strictEqual(result2, expected.length);
assert.deepStrictEqual(defaultBuffer2, expected);

runTest(Buffer.allocUnsafe(expected.length));

// Test passing in options
const result3 = fs.readSync(fd, defaultBuffer3, {
offset: 0,
length: defaultBuffer3.length,
position: 0
});

assert.strictEqual(result3, expected.length);
assert.deepStrictEqual(defaultBuffer3, expected);
runTest(Buffer.allocUnsafe(expected.length), { offset: 0,
length: expected.length,
position: 0 });