I am trying to figure out how the sequelize auto script works in the node_modules directory of a node project.
The very first statement has me stumped:
var sequelizeAuto = require('../');
I don't understand why or how this works [how can you include a whole directory as a package?
Perhaps the runner (npx sequelize-auto) provides a special environment? How do I figure it out?
github: sequelize-auto script
Relative paths fallback to index.js if no file is mentioned.
var sequelizeAuto = require('../');
The above line is essentially a shorthand for :
var sequelizeAuto = require('../index.js');
Related
I have a Gulpfile which runs in the 'theme' folder of my project.
C:\wamp\www\mywebsitename\wp-content\themes\mythemename\gulpfile.js
In the gulpfiule, need to get the local website URL, which is basically just the 'mywebsitename' part of this path.
I have historically used this code to get it successfully:
"var rootDirName = path.basename(__dirname, '../../../');"
However I recently re-installed Windows, Node and Gulp, and now that line of code returns 'mythemename' instead of 'mywebsitename', ignoring the '../../../' argument.
If I remove that argument, it stil returns 'mythemename'.
I'm guessing some newer version of Gulp, Node or something in Windows has changed how this method works. Please can anyone suggest why this no longer works, or if there is a better way to always go 3 levels up the file tree from the gulpfile.js directory?
Worked it out myself.
const path = require('path');
var rootDirPath = path.join(__dirname, '../../../');
var rootDirName = path.basename(rootDirPath);
var url = 'http://localhost/' + rootDirName;
This will allow you to get the website's URL on localhost in Gulp and do what you need to with it (in my case, using the Critical CSS tool to scan the website and inline all the header CSS).
I am looking to access a JSON config file that the user would place next to their package.json from a node_module package that I created. Is there a best approach to do this. I tried a relative import but that didn't really work and I am not sure how best to accomplish dynamic imports if the config file doesn't exist because I want to allow it to not exist as well.
Here is how I tried to handle dynamic imports though:
export const overrides = (function () {
try {
return require('../../../../../../overrides.json');
} catch (_err) {
return null;
}
})();
Also I tried fs but I get a browser config error I am not sure if that is something else. I should research but I didn't understand the docs around that.
using a library
This worked for me: find-package-json
Basically on any js file who needs the base, home or workspace path, do this:
var finder = require('find-package-json');
var path = require('path');
var f = finder(__dirname);
var rootDirectory = path.dirname(f.next().filename);
rootDirectory will be the location of the folder in which the main package.json exist.
If you want to optimize, get the appRootPath variable at the start of your app and store/propagate the variable to the hole nodejs system.
no libraries
Without any library, this worked for me:
console.log("root directory: "+require('path').resolve('./'));
This will get you the root directory of your nodejs app no matter if you are using npm run start or node foo/bar/index.js
More ways to get the root directory here:
Determine project root from a running node.js application
usage
If you achieve to obtain the root directory of your nodejs app and your file is at the package.json level, use this variable like this to locate any file at root level:
rootDirectory+"/overrides.json"
I use node pkg to create a .exe of my nodejs service: https://www.npmjs.com/package/pkg
My question is: how do I make the .exe use a config.js for some setup values? Basic stuff like ip, port, database name etc. Because I have 3 environments, and I would like to use the same exe for all, but different config.js files for each.
So far, if I do pkg app.js then it creates an .exe that doesn't look at any other files. Totally stand alone. How do I make it look at config.js when it is started up?
On the website they do have a section on config https://github.com/zeit/pkg#config but I do not understand how to make use of it. At the moment I have my app.js, and I have secrets.js which holds the config information.
I am not sure this is right way, but I hope this can be helpful to somebody.
Refer to pkg document, on the run time, __dirname becomes "/snapshot/project".
So, by checking __dirname, you can identify in which environment you are.
(node app.js or app.exe).
Then we can separate require sentence like below.
const PKG_TOP_DIR = 'snapshot';
const runInPKG = (function(){
const pathParsed = path.parse(__dirname);
const root = pathParsed.root;
const dir = pathParsed.dir;
const firstDepth = path.relative(root, dir).split(path.sep)[0];
return (firstDepth === PKG_TOP_DIR)
})();
let config = require('./appconfig.json');
if(runInPKG) {
const deployPath = path.dirname(process.execPath);
config = require(path.join(deployPath, 'appconfig.json'));
}
Adding above code to your app.js makes some warning when pkg build.
pkg . --targets node8-win-x64 --out-path ./dist
pkg#4.4.0
Warning Cannot resolve 'path.join(deployPath, 'appconfig.json')'
app.js
Dynamic require may fail at run time, because the requested file
is unknown at compilation time and not included into executable.
Use a string literal as an argument for 'require', or leave it
as is and specify the resolved file name in 'scripts' option.
https://github.com/vercel/pkg/issues/195
use fs to read config file insead of require or import
eg:
const configPath = path.join(process.cwd(), './config/config.json');
lset data = fs.readFileSync(configPath);
same question link:excluding config file while converting node js files to exe using pkg
Let's say i have following codes:
var mod1 = require('../../../../ok/mod1');
var mod2 = require('../../../info/mod2');
It's not pretty coding like above, i am wondering if there is a way to configure the root resolver just like webpack-resolve-root in nodejs?
So far as i know, the NODE_PATH can be used to replace the root of node_modules, but that's not what i want. I'd like to have the resolver to resolve multiple folders in order.
Updated answer for 2021.
nodejs subpath imports have been added in: v14.6.0, v12.19.0
This allows for you to add the following to package.json
"imports": {
"#ok/*": "./some-path/ok/*"
"#info/*": "./some-other-path/info/*"
},
and in your .js
import mod1 from '#ok/mod1';
import mod2 from '#info/mod2';
There is an npm package called module-alias that may do what you are looking for.
The best way to approach this would be to use a global (config) container.
In most cases you will have a config file in your application. In this config you can add a property which will be an object containing all absolute paths to files/folders.
Because config files are used at the start of you application, you just do the following:
var config = require("./config.js");
//config = {... , path: {"someModule": "/absolute/path/to", "someModule2": "/absolute/path/to"...}}
global.CONFIG_CONTAINER = config
Later on in your application you can just use
var myModule = require(CONFIG_CONTAINER.path.someModule)
// + concat if you are looking for a file
In case you have some complex paths and you need a more dynamic system, you can always implement a function inside the config that will build paths for you. ( config.makePath = function(){...} )
That should take care of it in a nutshell.
I'm completely new to using Node.js and even utilizing the command line, so this question may be extremely elementary, but I am unable to find a solution.
I am trying to set up an app directory using Node.js and NPM. For some reason, whenever I try to use the port:5000 I get a "Cannot GET/" error. My question is, why is my setup for my app directory not working?
I have installed connect and serve-static, and yet it will not retrieve files and listen on port 5000. I have created a server.js file in my user, kstach1. Here is the code I have within that file:
var connect = require('connect');
var serveStatic = require('serve-static');
var app = connect();
app.use(serveStatic('../angularjs'));
app.listen(5000);
So, I don't quite understand why this won't reference my folder of angularjs, where I want to store my app. I have tested it by adding a file within the folder called test.html, and entered localhost:5000/test.html, and still get the "Cannot GET/test.html" error.
I know that Node is working correctly because I can enter scripts into the command line and they give the correct output. I do this as a user (kstach1).
The only thing I can think of that I may be doing wrong, is where my files are located. I have the angularjs folder located in the root user folder on my Mac (kstach1), as well as the server.js file. Is this incorrect? If this is not the issue, is it because of where Node is installed (usr/local/bin/node)? My research to this point has led me to think that my problem could also be that I need to add the installation directory to my path. However, I don't want to mess with this unless I know that is the case.
Any help would be greatly appreciated.
I did a little research on the serve-static package and copied the code you provided.
My project folder is located at "C:\teststatic" and the folder with the static files is: "C:\angularjs", also using "text.html" that is located in the 'angularjs' folder.
When running the code you provided and going to localhost:5000 it indeed returns "Cannot GET/". This is most likely because there is no "/" file declared.
Going to localhost:5000/test.html works for me, so you could try setting a "/" like this:
app.use(serveStatic('../angularjs', {'index': ['test.html', 'index.html']}));
And see if that works for you. If not, you should double check directory names / locations.
EDIT:
From reading the comment you posted: try this instead:
app.use(serveStatic('angularjs'));
I suggest moving your angularjs folder up into your main project's directory in a public/ folder. Its a pretty standard convention to have all of your static assets in public/. You can then use the path module to automatically resolve your path, inserting this where you have '../angularjs': path.join(__dirname, 'public').
So, your code would look like this:
var connect = require('connect');
var serveStatic = require('serve-static');
var app = connect();
var path = require('path');
app.use(serveStatic(path.join(__dirname, 'public'));
app.listen(5000);
And, your directory structure would look like this:
server.js
public/
angularjs/
test.html
You should then be able to use localhost:5000/angularjs/test.html to view your test.html