node. js package Dependency and version number

Original: http://www.cnphp6.com/archives/64130

One of the most important files for node. JS is Package.json, where the configuration parameters determine the functionality. For example, here's an example

{  "name": "Test",  "version": "1.0.0",  "description": "Test",   "Main": "Main.js",  "keywords": [    "test"  ],  "author": "Wade" ,  " License ":" MIT ",  " dependencies ": {    " Express ":" ^4.10.1 "  },  " Devdependencies ": {    " jslint ":" ^0.6.5 "  }}

Dependencies and Devdependencies:

A node package has two dependencies, one is dependencies, and the other is devdependencies, which relies on items that are required to run the package properly, while the latter is a dependency that needs to be developed, such as a package that carries out unit tests. Simple to remember is the following

"Dependencies": {}//Production environment

"Devdependencies": {}//development environment

The modules inside the devdependencies are also installed when the NPM install is executed in the directory where the Package.json is located. If we just want to install dependencies inside the package, you can execute

NPM install–production

If you install only devdependencies, you can perform

NPM Install–dev

Similarly, the Dependencies field values are automatically updated using NPM install Node_module–save, and the Devdependencies field values are automatically updated using NPM install Node_module–save-dev.

Version number:

Each module is followed by his version number, such as "^4.10.1″." Here are a few versions of the expression

An expression	Version Range
>=1.2.7	Greater than or equal to 1.2.7
>=1.2.7 <1.3.0	1.2.7,1.2.8,1.2.9
1.2.3–2.3.4	>=1.2.3 <=2.3.4
1.2–2.3.4	>=1.2.0 <=2.3.4
1.2.3–2.3	>=1.2.3 <2.4.0
1.2.3–2	>=1.2.3 <3.0.0
*	>=0.0.0
1.x (equivalent to 1. X	>=1.0.0 <2.0.0
1.2.x	>=1.2.0 <1.3.0
"" (equivalent to *)	>=0.0.0
1 (equivalent to 1.x.x)	>=1.0.0 <2.0.0
1.2 (equivalent to 1.2.x)	>=1.2.0 <1.3.0
~1.2.3 (>=1.2.3 <1. ( 2+1). 0)	>=1.2.3 <1.3.0
~1.2 (>=1.2.0 <1. ( 2+1). 0)	>=1.2.0 <1.3.0
(>=1.0.0 <). 0.0)	>=1.0.0 <2.0.0
~0.2.3 (>=0.2.3 <0. ( 2+1). 0)	>=0.2.3 <0.3.0
~0.2 (>=0.2.0 <0. ( 2+1). 0)	>=0.2.0 <0.3.0
~0 (>=0.0.0 < (0+1). 0.0)	>=0.0.0 <1.0.0
~1.2.3-beta.2	>=1.2.3-beta.2 <1.3.0
^1.2.3	>=1.2.3 <2.0.0
^0.2.3	>=0.2.3 <0.3.0
^0.0.3	>=0.0.3 <0.0.4
^1.2.3-beta.2	>=1.2.3-beta.2 <2.0.0
^0.0.3-beta	>=0.0.3-beta <0.0.4
^1.2.x	>=1.2.0 <2.0.0
^0.0.x	>=0.0.0 <0.1.0
^0.0	>=0.0.0 <0.1.0
^1.x	>=1.0.0 <2.0.0
^0.x	>=0.0.0 <1.0.0

Reference documents:

Http://stackoverflow.com/questions/22343224/difference-between-tilde-and-caret-in-package-json

Https://www.npmjs.org/doc/misc/npm-config.html#production

node. js package Dependency and version number (RPM)