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Introduction to Semantic Versioning (SemVer)
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Problem
SemVer (short for Semantic Versioning) is a versioning scheme commonly used in software development to communicate the changes and compatibility of a software package. The JavaScript ecosystem, embodied mainly in the npm package manager, has adopted SemVer as the standard versioning scheme for JavaScript packages. The version of a package can be found in its
```json title="package.json"
{
"name": "my-package",
"version": "1.0.0"
package.json file, and it is also displayed in the npm registry.```json title="package.json"
{
"name": "my-package",
"version": "1.0.0"
Solution
## SemVer versions
SemVer versions are formatted in **three numeric components**, as follows:{
"name": "my-package",
"version": "1.0.0"
}
{major}.{minor}.{patch}
shell
Code Snippets
## SemVer versions
SemVer versions are formatted in **three numeric components**, as follows:Each component represents a specific type of change made to the software.
- **Major version**: Significant changes that may **break compatibility** with previous versions. Developers should carefully review the documentation and test their code against the new version before upgrading.
- **Minor version**: Backwards-compatible **additions or improvements** that don't break compatibility with previous versions. Users can typically upgrade to a new minor version without worrying about major changes that might require code modifications.
- **Patch version**: Backwards-compatible **bug fixes, patches, or maintenance** releases. Patch releases are intended to be safe and shouldn't introduce new features or breaking changes.
The following table summarizes the different types of changes represented by each component:
| Component | Type of change | Example |
| --------- | -------------- | ------- |
| Major | Incompatible | Breaking changes, rewrites, architectural changes |
| Minor | Compatible | New features, functionalities, enhancements |
| Patch | Compatible | Bug fixes, patches, maintenance releases |
## Releases and pre-releases
The **first version** of a software package is typically denoted as `1.0.0`. This is because the initial release of a software package is considered to be a major version, and the first version of a major version is always `1.0.0`. Versions starting with `0.x.x` are considered to be pre-release versions and are not intended for production use.
Additionally, SemVer allows for **pre-release versions** to be appended to the version number. These are denoted by a hyphen followed by a series of alphanumeric identifiers, such as `1.0.0-alpha.1` or `1.0.0-beta.2`. Pre-release versions are typically used to indicate that the software is still under active development and may not be ready for production use.
## Specifying which version to use
When installing a package, you can specify which version to use by appending the version number to the package name, as follows:Context
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