Create run.md

Author: MichaelCurrin

cheatsheets/javascript/npm/run.md

@@ -0,0 +1,17 @@
+---
+title: run
+description: About the npm run command
+---
+
+See [npm-run-script](https://docs.npmjs.com/cli/run-script) in the docs.
+
+
+## Flags
+
+> You can use the --if-present flag to avoid exiting with a non-zero exit code when the script is undefined. This lets you run potentially undefined scripts without breaking the execution chain.
+
+e.g.
+
+```sh
+$ npn run build --if-present
+```