gnomon:tldr:42ae5

This command is a combination of two separate commands that are piped together using the "|" symbol.

1. "${npm test}": This command runs the "test" script defined in the npm package.json file. This script typically executes test suites or frameworks such as Jest, Mocha, or Karma to test the code in the project. The exact behavior of this command depends on how it is configured in the package.json file.

2. "gnomon --type=elapsed-total": This command runs the "gnomon" tool and passes it the argument "--type=elapsed-total". Gnomon is a command-line utility that enhances the readability of command outputs by prefixing each line with a timestamp duration. The elapsed-total type calculates the time elapsed since the start of the command until the end or interruption. By using this argument, the command output will be displayed with timestamps showing the duration of each line.

Putting them together, the "| gnomon --type=elapsed-total" part pipes the output of the "${npm test}" command into "gnomon" so that the test command's output is displayed with timestamps indicating the duration of each line. This can be useful for analyzing the performance of tests or any other command output.