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+# `@actions/core`
+
+> Core functions for setting results, logging, registering secrets and exporting variables across actions
+
+## Usage
+
+### Import the package
+
+```js
+// javascript
+const core = require('@actions/core');
+
+// typescript
+import * as core from '@actions/core';
+```
+
+#### Inputs/Outputs
+
+Action inputs can be read with `getInput`.  Outputs can be set with `setOutput` which makes them available to be mapped into inputs of other actions to ensure they are decoupled.
+
+```js
+const myInput = core.getInput('inputName', { required: true });
+
+core.setOutput('outputKey', 'outputVal');
+```
+
+#### Exporting variables
+
+Since each step runs in a separate process, you can use `exportVariable` to add it to this step and future steps environment blocks.
+
+```js
+core.exportVariable('envVar', 'Val');
+```
+
+#### Setting a secret
+
+Setting a secret registers the secret with the runner to ensure it is masked in logs.
+
+```js
+core.setSecret('myPassword');
+```
+
+#### PATH Manipulation
+
+To make a tool's path available in the path for the remainder of the job (without altering the machine or containers state), use `addPath`.  The runner will prepend the path given to the jobs PATH.
+
+```js
+core.addPath('/path/to/mytool');
+```
+
+#### Exit codes
+
+You should use this library to set the failing exit code for your action.  If status is not set and the script runs to completion, that will lead to a success.
+
+```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}`);
+}
+
+Note that `setNeutral` is not yet implemented in actions V2 but equivalent functionality is being planned.
+
+```
+
+#### 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');
+  }
+  
+  if (core.isDebug()) {
+    // curl -v https://github.com
+  } else {
+    // curl https://github.com
+  }
+
+  // Do stuff
+  core.info('Output to the actions build log')
+}
+catch (err) {
+  core.error(`Error ${err}, action may still succeed though`);
+}
+```
+
+This library can also wrap chunks of output in foldable groups.
+
+```js
+const core = require('@actions/core')
+
+// Manually wrap output
+core.startGroup('Do some function')
+doSomeFunction()
+core.endGroup()
+
+// Wrap an asynchronous function call
+const result = await core.group('Do something async', async () => {
+  const response = await doSomeHTTPRequest()
+  return response
+})
+```
+
+#### Action state
+
+You can use this library to save state and get state for sharing information between a given wrapper action: 
+
+**action.yml**
+```yaml
+name: 'Wrapper action sample'
+inputs:
+  name:
+    default: 'GitHub'
+runs:
+  using: 'node12'
+  main: 'main.js'
+  post: 'cleanup.js'
+```
+
+In action's `main.js`:
+
+```js
+const core = require('@actions/core');
+
+core.saveState("pidToKill", 12345);
+```
+
+In action's `cleanup.js`:
+```js
+const core = require('@actions/core');
+
+var pid = core.getState("pidToKill");
+
+process.kill(pid);
+```