read-excel-file/modules/utility/checkpoint.js

Read `.xlsx` files in a web browser or in Node.js

// This code is used to profile reading `.xlsx` files.
// It shows how much time each stage executes for.
// To enable the logs with the timing, set a global variable
// called `READ_EXCEL_FILE_CHECKPOINTS` in Node.js or web browser.

// This global variable is only exported to be added in the dependencies of a worker function.
// See `worker-f` package for more info.
export var latestCheckpointTimestamp;
export default function checkpoint(name) {
  var now = Date.now();

  // See if the global flag for "should output log" is set to `true`.
  var shouldOutputLog = typeof global !== 'undefined' ? Boolean(global.READ_EXCEL_FILE_CHECKPOINTS) : typeof window !== 'undefined' ? Boolean(window.READ_EXCEL_FILE_CHECKPOINTS) : false;
  if (shouldOutputLog) {
    if (latestCheckpointTimestamp) {
      console.log('  -', now - latestCheckpointTimestamp, 'ms');
    }
    console.log('*', name);
  }
  latestCheckpointTimestamp = now;
}
export function resetCheckpoint() {
  latestCheckpointTimestamp = undefined;
}
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