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toolkit/packages/core/README.md

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# `@actions/core`
> Core functions for setting results, logging, registering secrets and exporting variables across actions
## Usage
#### Inputs/Outputs
You can use this library to get inputs or set outputs:
```js
const core = require('@actions/core');
const myInput = core.getInput('inputName', { required: true });
// Do stuff
core.setOutput('outputKey', 'outputVal');
```
#### Exporting variables
You can also export variables for future steps. Variables get set in the environment.
```js
const core = require('@actions/core');
// Do stuff
core.exportVariable('envVar', 'Val');
```
#### PATH Manipulation
You can explicitly add items to the path for all remaining steps in a workflow:
```js
const core = require('@actions/core');
core.addPath('pathToTool');
```
#### Exit codes
You should use this library to set the failing exit code for your action:
```js
const core = require('@actions/core');
try {
// Do stuff
}
catch (err) {
// setFailed logs the message and sets a failing exit code
core.setFailed(`Action failed with error ${err}`);
}
```
#### Logging
Finally, this library provides some utilities for logging. Note that debug logging is hidden from the logs by default. This behavior can be toggled by enabling the [Step Debug Logs](../../docs/action-debugging.md#step-debug-logs).
```js
const core = require('@actions/core');
const myInput = core.getInput('input');
try {
core.debug('Inside try block');
if (!myInput) {
core.warning('myInput was not set');
}
// Do stuff
}
catch (err) {
core.error(`Error ${err}, action may still succeed though`);
}
```