through2 | Tiny wrapper around Node streams2 Transform to avoid
kandi X-RAY | through2 Summary
kandi X-RAY | through2 Summary
Inspired by Dominic Tarr's through in that it's so much easier to make a stream out of a function than it is to set up the prototype chain properly: through(function (chunk) { ... }). Note that through2.obj(fn) is a convenience wrapper around through2({ objectMode: true }, fn).
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through2 Key Features
through2 Examples and Code Snippets
Lines of Code : 32
License : No License
Copyfs.createReadStream('ex.txt')
.pipe(through2(function (chunk, enc, callback) {
for (let i = 0; i < chunk.length; i++)
if (chunk[i] == 97)
chunk[i] = 122 // swap 'a' for 'z'
this.push(chunk)
callback()
}))
.pipe(f fs.createReadStream('/tmp/important.dat')
.pipe(through2(
(chunk, enc, cb) => cb(null, chunk), // transform is a noop
function (cb) { // flush function
this.push('tacking on an extra buffer to the end');
cb();
}
))
.p fs.createReadStream('/tmp/important.dat')
.pipe(through2({ objectMode: true, allowHalfOpen: false },
(chunk, enc, cb) => {
cb(null, 'wut?') // note we can use the second argument on the callback
// to provide dat Community Discussions
Trending Discussions on through2
QUESTION
Actualy I try to intgrat but I face to this exception my node version is 16.3.2 32bit
...ANSWER
Answered 2022-Mar-17 at 08:03SOLVED BY @chilkat Software by upgrading the current version of chilkat/ck-electron16-win64 and win32
QUESTION
I am needing a Gulp task that will go through all assigned HTML documents and remove certain attributes (such as style=""). I thought I may have been able to do it the same way I do it through the browser, but looks like not. Here is what I am trying to do:
...ANSWER
Answered 2021-Nov-21 at 17:18You can use some node dom library, and wrap it with gulp. For example you could try jsdom and wrapper gulp-dom:
QUESTION
I´m stuck creating an react app. I have tried npx create-react-app my app, but it doesn´t work. Now I get this "Cannot find module 'core-utils-is', previously I fixed another problem with another module. So, that I suspect that I am in a bug. I think the best solution is to start from cero. But I´m not sure how can I uninstall an reinstall all that I need without breaking all (nodejs, npm...). I enclose the image of my console: enter image description here
...$ npx create-react-app my-app internal/modules/cjs/loader.js:883
throw err; ^Error: Cannot find module 'core-util-is' Require stack:
- C:\Users\ILC\node_modules\hyperquest\node_modules\readable-stream\lib_stream_duplex.js
- C:\Users\ILC\node_modules\hyperquest\node_modules\readable-stream\lib_stream_transform.js
- C:\Users\ILC\node_modules\hyperquest\node_modules\readable-stream\transform.js
- C:\Users\ILC\node_modules\hyperquest\node_modules\through2\through2.js
- C:\Users\ILC\node_modules\hyperquest\index.js
- C:\Users\ILC\node_modules\create-react-app\createReactApp.js
- C:\Users\ILC\node_modules\create-react-app\index.js at Function.Module._resolveFilename (internal/modules/cjs/loader.js:880:15) at Function.Module._load (internal/modules/cjs/loader.js:725:27) at Module.require (internal/modules/cjs/loader.js:952:19) at require (internal/modules/cjs/helpers.js:88:18) at Object. (C:\Users\ILC\node_modules\hyperquest\node_modules\readable-stream\lib_stream_duplex.js:39:12) at Module._compile (internal/modules/cjs/loader.js:1063:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10) at Module.load (internal/modules/cjs/loader.js:928:32) at Function.Module._load (internal/modules/cjs/loader.js:769:14) at Module.require (internal/modules/cjs/loader.js:952:19) { code: 'MODULE_NOT_FOUND', requireStack: [ 'C:\Users\ILC\node_modules\hyperquest\node_modules\readable-stream\lib\_stream_duplex.js', 'C:\Users\ILC\node_modules\hyperquest\node_modules\readable-stream\lib\_stream_transform.js', 'C:\Users\ILC\node_modules\hyperquest\node_modules\readable-stream\transform.js', 'C:\Users\ILC\node_modules\hyperquest\node_modules\through2\through2.js', 'C:\Users\ILC\node_modules\hyperquest\index.js', 'C:\Users\ILC\node_modules\create-react-app\createReactApp.js', 'C:\Users\ILC\node_modules\create-react-app\index.js' ] } Thank you
ANSWER
Answered 2021-Mar-18 at 08:29You can try to update npm with npm update and see if that fixes it, and if not you can try these steps.
If you've previously installed create-react-app globally via npm install -g create-react-app, it is recommend you uninstall the package using npm uninstall -g create-react-app or yarn global remove create-react-app to ensure that npx always uses the latest version.
You may also want to cd into a directory that you want to host your programs. I tend to put all my programs into a folder in c:\Users\\Documents\github. It looks like your node_modules is trying to install directly to your user home directory.
Once you are in the directory of choice to build your app and you have removed the global installations you can try running these commands.
npx create-react-app my-app
cd my-app
npm start
Create React App - Getting Started
Edit: If that works for you, then you may also want to go back to C:\Users\ILC and remove your node_modules folder and any other remnant files such as package.json that don't belong in that folder.
QUESTION
From the through2 documentation:
Do you need this?Since Node.js introduced Simplified Stream Construction, many uses of through2 have become redundant. Consider whether you really need to use through2 or just want to use the 'readable-stream' package, or the core 'stream' package (which is derived from 'readable-stream').
If I understand correctly, now (from 2021) we can intervene to the streams without third-party libraries.
I did not found how to do same thing as through2 in Stream documentation.
ANSWER
Answered 2021-Feb-10 at 17:52What you are looking for is likely a Transform stream, something implemented by the native 'stream' library included with Node.js. I don't know that there is an async compatible version yet, but there is most definitely a callback based one. You need to inherit from the native Transform stream and implement your function.
Here's the boilerplate I like to use:
QUESTION
I'm using Gulp 4 and Webpack 5 on a Bootstrap 5 project and when I bundle my scripts, Gulp generates a bundle.js (as expected) but it also generates a bundle.js.LICENSE.js file.
I can't see anything in my build task that would create that.
It only seems to be the case when I import 'bootstrap' or import Popper from 'popper.js/dist/umd/popper'.
Is there a way to disable the generation of that LICENSE file? I'm guessing there's something in the Bootstrap 5 js that's forcing Gulp or Webpack to create that file(?)
Any thoughts would be appreciated. Here's my build scripts task:
...ANSWER
Answered 2020-Nov-23 at 22:51The addon Webpack uses to optimize files is called Terser and has options to extract inline comments matching a certain pattern to an external file (which by default is that License pattern you are seeing).
QUESTION
Am trying to run gulp commands from package.json. But unable to execute.
This is my package.json.
...ANSWER
Answered 2020-May-06 at 10:12I resolved by modifying srcipt section by adding "locale-sass" and in lint-staged npm run gulp locale-sass instead of gulp locale-sass
QUESTION
I want to start my react app so I write this command:
...ANSWER
Answered 2020-Apr-28 at 06:55Try the below steps:
Clear npm cache
QUESTION
I needing a bit of a sanity check.
I am running Node 11.10.1
I have a process that reads from a oracle db using the nodejs oracledb library. There is a streaming function which I do a select * and stream the results in batches of 10k objects. I then post this data to an indexer via https. The object stream is injected into a pipeline function.
I have been using he following code for awhile. Im trying to debug throughput. Sometimes I can see about 2k documents a second being processed through this pipeline. Most times I see <150. Before I jump to debugging my index server. I want to make sure these functions are coded properly.
...ANSWER
Answered 2020-Mar-20 at 01:15Although your problem doesn't seem to be with oracledb, I'm putting this here so I can format the code. You might get some performance benefit from tuning the oracledb stream, for example like:
QUESTION
The first API request successfully send a response. However, when I do another GET request the error "write after end" is given.
When I turn off .pipe(addThing) then it does work on consecutive calls.
Is the through2-map function ending the connection or response somehow?
...ANSWER
Answered 2020-Mar-02 at 11:36After reading "Error: write after end" with csv-write-stream I noticed that the problem might be that the variable addThing is not created new on every consecutive call.
It was allocated in memory.
So the solution:
QUESTION
After returning to our project after the weekend my team was met with the error "error Couldn't find package "3d-view@^2.0.0" required by "gl-plot3d@^2.4.2" on the "npm" registry." on our CI pipeline during the install phase. Additionally, this error occurred when trying to add packages with yarn, terminating the process.
This error is happening on the front-end side of our project and doesn't show up upon starting it normally via yarn start. On the last push before the weekend everything went normal without any errors.
Log of our CI job starting at the install command:
...ANSWER
Answered 2020-Feb-12 at 13:57I was able to fix installing the missing package manually:
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