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'use strict';
const common = require('../common');
const assert = require('assert');
const { Transform, Readable, Writable } = require('stream');
const DEFAULT = 16 * 1024;
function testTransform(expectedReadableHwm, expectedWritableHwm, options) {
const t = new Transform(options);
assert.strictEqual(t._readableState.highWaterMark, expectedReadableHwm);
assert.strictEqual(t._writableState.highWaterMark, expectedWritableHwm);
}
// test overriding defaultHwm
testTransform(666, DEFAULT, { readableHighWaterMark: 666 });
testTransform(DEFAULT, 777, { writableHighWaterMark: 777 });
testTransform(666, 777, {
readableHighWaterMark: 666,
writableHighWaterMark: 777,
});
// test 0 overriding defaultHwm
testTransform(0, DEFAULT, { readableHighWaterMark: 0 });
testTransform(DEFAULT, 0, { writableHighWaterMark: 0 });
// test highWaterMark overriding
testTransform(555, 555, {
highWaterMark: 555,
readableHighWaterMark: 666,
});
testTransform(555, 555, {
highWaterMark: 555,
writableHighWaterMark: 777,
});
testTransform(555, 555, {
highWaterMark: 555,
readableHighWaterMark: 666,
writableHighWaterMark: 777,
});
// test highWaterMark = 0 overriding
testTransform(0, 0, {
highWaterMark: 0,
readableHighWaterMark: 666,
});
testTransform(0, 0, {
highWaterMark: 0,
writableHighWaterMark: 777,
});
testTransform(0, 0, {
highWaterMark: 0,
readableHighWaterMark: 666,
writableHighWaterMark: 777,
});
// test undefined, null
[undefined, null].forEach((v) => {
testTransform(DEFAULT, DEFAULT, { readableHighWaterMark: v });
testTransform(DEFAULT, DEFAULT, { writableHighWaterMark: v });
testTransform(666, DEFAULT, { highWaterMark: v, readableHighWaterMark: 666 });
testTransform(DEFAULT, 777, { highWaterMark: v, writableHighWaterMark: 777 });
});
// test NaN
{
common.expectsError(() => {
new Transform({ readableHighWaterMark: NaN });
}, {
type: TypeError,
code: 'ERR_INVALID_OPT_VALUE',
message: 'The value "NaN" is invalid for option "readableHighWaterMark"'
});
common.expectsError(() => {
new Transform({ writableHighWaterMark: NaN });
}, {
type: TypeError,
code: 'ERR_INVALID_OPT_VALUE',
message: 'The value "NaN" is invalid for option "writableHighWaterMark"'
});
}
// test non Duplex streams ignore the options
{
const r = new Readable({ readableHighWaterMark: 666 });
assert.strictEqual(r._readableState.highWaterMark, DEFAULT);
const w = new Writable({ writableHighWaterMark: 777 });
assert.strictEqual(w._writableState.highWaterMark, DEFAULT);
}
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