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# JavaScript API
## Usage
```js
const semanticRelease = require("semantic-release");
const { WritableStreamBuffer } = require("stream-buffers");
const stdoutBuffer = new WritableStreamBuffer();
const stderrBuffer = new WritableStreamBuffer();
try {
const result = await semanticRelease(
{
// Core options
branches: [
"+([0-9])?(.{+([0-9]),x}).x",
"master",
"next",
"next-major",
{ name: "beta", prerelease: true },
{ name: "alpha", prerelease: true },
],
repositoryUrl: "https://github.com/me/my-package.git",
// Shareable config
extends: "my-shareable-config",
// Plugin options
githubUrl: "https://my-ghe.com",
githubApiPathPrefix: "/api-prefix",
},
{
// Run semantic-release from `/path/to/git/repo/root` without having to change local process `cwd` with `process.chdir()`
cwd: "/path/to/git/repo/root",
// Pass the variable `MY_ENV_VAR` to semantic-release without having to modify the local `process.env`
env: { ...process.env, MY_ENV_VAR: "MY_ENV_VAR_VALUE" },
// Store stdout and stderr to use later instead of writing to `process.stdout` and `process.stderr`
stdout: stdoutBuffer,
stderr: stderrBuffer,
}
);
if (result) {
const { lastRelease, commits, nextRelease, releases } = result;
console.log(
`Published ${nextRelease.type} release version ${nextRelease.version} containing ${commits.length} commits.`
);
if (lastRelease.version) {
console.log(`The last release was "${lastRelease.version}".`);
}
for (const release of releases) {
console.log(`The release was published with plugin "${release.pluginName}".`);
}
} else {
console.log("No release published.");
}
// Get stdout and stderr content
const logs = stdoutBuffer.getContentsAsString("utf8");
const errors = stderrBuffer.getContentsAsString("utf8");
} catch (err) {
console.error("The automated release failed with %O", err);
}
```
## API
### semanticRelease([options], [config]) => Promise<Result>
Run **semantic-release** and returns a `Promise` that resolves to a [Result](#result) object.
#### options
Type: `Object`
**semantic-release** options.
Can be used to set any [core option](../usage/configuration.md#configuration) or [plugin options](../usage/plugins.md#configuration).
Each option, will take precedence over options configured in the [configuration file](../usage/configuration.md#configuration) and [shareable configurations](../usage/configuration.md#extends).
#### config
Type: `Object`
**semantic-release** configuration specific for API usage.
##### cwd
Type: `String`<br>
Default: `process.cwd()`
The current working directory to use. It should be configured to the root of the Git repository to release from.
It allows to run **semantic-release** from a specific path without having to change the local process `cwd` with `process.chdir()`.
##### env
Type: `Object`<br>
Default: `process.env`
The environment variables to use.
It allows to run **semantic-release** with specific environment variables without having to modify the local `process.env`.
##### stdout
Type: [`stream.Writable`](https://nodejs.org/api/stream.html#stream_writable_streams)<br>
Default: `process.stdout`
The [writable stream](https://nodejs.org/api/stream.html#stream_writable_streams) used to log information.
It allows to configure **semantic-release** to write logs to a specific stream rather than the local `process.stdout`.
##### stderr
Type: [`stream.Writable`](https://nodejs.org/api/stream.html#stream_writable_streams)<br>
Default: `process.stderr`
The [writable stream](https://nodejs.org/api/stream.html#stream_writable_streams) used to log errors.
It allows to configure **semantic-release** to write errors to a specific stream rather than the local `process.stderr`.
### Result
Type: `Object` `Boolean`<br>
And object with [`lastRelease`](#lastrelease), [`nextRelease`](#nextrelease), [`commits`](#commits) and [`releases`](#releases) if a release is published or `false` if no release was published.
#### lastRelease
Type: `Object`
Information related to the last release found:
| Name | Type | Description |
| ------- | -------- | ----------------------------------------------------------------------------------------------------------------------------------- |
| version | `String` | The version of the last release. |
| gitHead | `String` | The sha of the last commit being part of the last release. |
| gitTag | `String` | The [Git tag](https://git-scm.com/book/en/v2/Git-Basics-Tagging) associated with the last release. |
| channel | `String` | The distribution channel on which the last release was initially made available (`undefined` for the default distribution channel). |
**Notes**: If no previous release is found, `lastRelease` will be an empty `Object`.
Example:
```js
{
gitHead: 'da39a3ee5e6b4b0d3255bfef95601890afd80709',
version: '1.0.0',
gitTag: 'v1.0.0',
channel: 'next'
}
```
#### commits
Type: `Array<Object>`
The list of commit included in the new release.<br>
Each commit object has the following properties:
| Name | Type | Description |
| --------------- | -------- | ----------------------------------------------- |
| commit | `Object` | The commit abbreviated and full hash. |
| commit.long | `String` | The commit hash. |
| commit.short | `String` | The commit abbreviated hash. |
| tree | `Object` | The commit abbreviated and full tree hash. |
| tree.long | `String` | The commit tree hash. |
| tree.short | `String` | The commit abbreviated tree hash. |
| author | `Object` | The commit author information. |
| author.name | `String` | The commit author name. |
| author.email | `String` | The commit author email. |
| author.short | `String` | The commit author date. |
| committer | `Object` | The committer information. |
| committer.name | `String` | The committer name. |
| committer.email | `String` | The committer email. |
| committer.short | `String` | The committer date. |
| subject | `String` | The commit subject. |
| body | `String` | The commit body. |
| message | `String` | The commit full message (`subject` and `body`). |
| hash | `String` | The commit hash. |
| committerDate | `String` | The committer date. |
Example:
```js
[
{
commit: {
long: '68eb2c4d778050b0701136ca129f837d7ed494d2',
short: '68eb2c4'
},
tree: {
long: '7ab515d12bd2cf431745511ac4ee13fed15ab578',
short: '7ab515d'
},
author: {
name: 'Me',
email: 'me@email.com',
date: 2018-07-22T20:52:44.000Z
},
committer: {
name: 'Me',
email: 'me@email.com',
date: 2018-07-22T20:52:44.000Z
},
subject: 'feat: a new feature',
body: 'Description of the new feature',
hash: '68eb2c4d778050b0701136ca129f837d7ed494d2',
message: 'feat: a new feature\n\nDescription of the new feature',
committerDate: 2018-07-22T20:52:44.000Z
}
]
```
#### nextRelease
Type: `Object`
Information related to the newly published release:
| Name | Type | Description |
| ------- | -------- | ----------------------------------------------------------------------------------------------------------------------------- |
| type | `String` | The [semver](https://semver.org) type of the release (`patch`, `minor` or `major`). |
| version | `String` | The version of the new release. |
| gitHead | `String` | The sha of the last commit being part of the new release. |
| gitTag | `String` | The [Git tag](https://git-scm.com/book/en/v2/Git-Basics-Tagging) associated with the new release. |
| notes | `String` | The release notes for the new release. |
| channel | `String` | The distribution channel on which the next release will be made available (`undefined` for the default distribution channel). |
Example:
```js
{
type: 'minor',
gitHead: '68eb2c4d778050b0701136ca129f837d7ed494d2',
version: '1.1.0',
gitTag: 'v1.1.0',
notes: 'Release notes for version 1.1.0...',
channel : 'next'
}
```
#### releases
Type: `Array<Object>`
The list of releases published or made available to a distribution channel.<br>
Each release object has the following properties:
| Name | Type | Description |
| ---------- | -------- | -------------------------------------------------------------------------------------------------------------- |
| name | `String` | **Optional.** The release name, only if set by the corresponding `publish` plugin. |
| url | `String` | **Optional.** The release URL, only if set by the corresponding `publish` plugin. |
| type | `String` | The [semver](https://semver.org) type of the release (`patch`, `minor` or `major`). |
| version | `String` | The version of the release. |
| gitHead | `String` | The sha of the last commit being part of the release. |
| gitTag | `String` | The [Git tag](https://git-scm.com/book/en/v2/Git-Basics-Tagging) associated with the release. |
| notes | `String` | The release notes for the release. |
| pluginName | `String` | The name of the plugin that published the release. |
| channel | `String` | The distribution channel on which the release is available (`undefined` for the default distribution channel). |
Example:
```js
[
{
name: 'GitHub release',
url: 'https://github.com/me/my-package/releases/tag/v1.1.0',
type: 'minor',
gitHead: '68eb2c4d778050b0701136ca129f837d7ed494d2',
version: '1.1.0',
gitTag: 'v1.1.0',
notes: 'Release notes for version 1.1.0...',
pluginName: '@semantic-release/github'
channel: 'next'
},
{
name: 'npm package (@latest dist-tag)',
url: 'https://www.npmjs.com/package/my-package',
type: 'minor',
gitHead: '68eb2c4d778050b0701136ca129f837d7ed494d2',
version: '1.1.0',
gitTag: 'v1.1.0',
notes: 'Release notes for version 1.1.0...',
pluginName: '@semantic-release/npm'
channel: 'next'
}
]
```