console | streams | |
---|---|---|
5 | 5 | |
266 | 1,331 | |
0.8% | 0.6% | |
4.1 | 6.0 | |
3 months ago | 4 days ago | |
HTML | HTML | |
GNU General Public License v3.0 or later | GNU General Public License v3.0 or later |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
console
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Why can you overrule console.log?
console is not part of the JavaScript programming language. WHATWG has published Console Standard https://console.spec.whatwg.org/ though console is not defined in ECMA-262.
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JavaScript Standard Input/Output: Unspecified
WHATWG's Console mentions stdout several times, does not mention stdin. Using console.log() in a Native Messaging host does not work, as we are not printing to a TTY. That W.I.P. is not applicable reading stdin at all.
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script.js:27 Uncaught TypeError: console is not a function at HTMLDocument.<anonymous> (script.js:27:5) Why is it showing error?
https://github.com/whatwg/console/issues is the link so you can tell them they are wrong.
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Debugging Tactics
There are a few others too. My favorite is console.group (and console.groupEnd).
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JavaScript: How to Power Up Your Logging
A standard exists on how logging using console should work, but unfortunately not all browsers respect it.
streams
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Backpressure explained – the resisted flow of data through software
Yup, this is what WHATWG's Streams spec[0] (linked in the article) says. It defines backpressure as a "process of normalizing flow from the original source according to how fast the chain can process chunks" where the reader "propagates a signal backwards through the pipe chain".
Mozilla's documentation[1] similarly defines backpressure as "the process by which a single stream or a pipe chain regulates the speed of reading/writing".
The article confuses backpressure (the signal used for regulation of the flow) with the reason backpressure is needed (producers and consumers working at different speeds). It should be fairly clear from the metaphor, I would have thought: With a pipe of unbounded size there is no pressure. The pressure builds up when consumer is slower than producer, which in turn slows down the producer. (Or the pipe explodes, or springs a leak and has to drop data on the ground.)
[0] https://streams.spec.whatwg.org/#pipe-chains
[1] https://developer.mozilla.org/en-US/docs/Web/API/Streams_API...
- Streams Standard
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Streams and React Server Components
// https://streams.spec.whatwg.org/#example-transform-identity const { writable, readable } = new TransformStream(); fetch("...", { body: readable }).then(response => /* ... */); const writer = writable.getWriter(); writer.write(new Uint8Array([0x73, 0x74, 0x72, 0x65, 0x61, 0x6D, 0x73, 0x21])); // "streams!" writer.close();
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Goodbye, Node.js Buffer
Yeah, in your case I think most of the complexity is actually on the ReadableStream side, not the base64 side.
The thing that I'd actually want for your case is either a TransformStream for byte stream <-> base64 stream (which I expect will come eventually, once the simple case gets done), or something which would let you read the entire stream into Uint8Array or ArrayBuffer, which is a long-standing suggestion [1].
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> Why does de-chunking a byte array need to be complicated
Keep in mind the concat proposal is _very_ early. If you think it would be useful to be able to concat Uint8Arrays and have that implicitly concatenate the underlying buffers, [2] is the place to open an issue.
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> You have made me realize I don't even know what the right venue is to vote on stuff. How should I signal to TC39 that e.g. Array.fromAsync is a good idea?
Unfortunately, it's different places for different things. Streams are not TC39 at all; the right place for suggestions there is in the WHATWG streams repo [3]. Usually there's already an existing issue and you can add your use case as a comment in the relevant issue. TC39 proposals all have their own Github repositories, and you can open a new issue with your use case.
Concrete use cases are much more helpful than just "this is a good idea". Though `fromAsync` in particular everyone agrees is good, and it mostly just needs implementations, which are ongoing; see e.g. [4]. If you _really_ want to advance a stage 3 proposal, you can contribute a PR to Chrome or Firefox with an implementation - but for nontrivial proposals that's usually hard. For TC39 in particular, use cases are only really valuable pre-stage-3 proposals.
[1] https://github.com/whatwg/streams/issues/1019
[2] https://github.com/jasnell/proposal-zero-copy-arraybuffer-li...
[3] https://github.com/whatwg/streams
[4] https://bugs.chromium.org/p/v8/issues/detail?id=13321
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Are you using generators?
// AudioWorkletStream // Stream audio from Worker to AudioWorklet // guest271314 2-24-2020 let port; onmessage = async e => { 'use strict'; if (!port) { [port] = e.ports; port.onmessage = event => postMessage(event.data); } const { urls } = e.data; // https://github.com/whatwg/streams/blob/master/transferable-streams-explainer.md const { readable, writable } = new TransformStream(); (async _ => { for await (const _ of (async function* stream() { while (urls.length) { yield (await fetch(urls.shift(), {cache: 'no-store'})).body.pipeTo(writable, { preventClose: !!urls.length, }); } })()); })(); port.postMessage( { readable, }, [readable] ); };
What are some alternatives?
wpt - Test suites for Web platform specs — including WHATWG, W3C, and others
AudioWorkletStream - fetch() => ReadableStream => AudioWorklet
proposal-common-minimum-api
encoding - Encoding Standard
proposal-array-from-async - Draft specification for a proposed Array.fromAsync method in JavaScript.
url - URL Standard
proposal-async-iterator-helpers - Methods for working with async iterators in ECMAScript
falcon - Brushing and linking for big data
dom - DOM Standard
WHATWG HTML Standard - HTML Standard
proposal-arraybuffer-base64 - TC39 proposal for Uint8Array<->base64/hex
proposal-zero-copy-arraybuffer-list - A proposal for zero-copy ArrayBuffer lists