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$ node example.js
one; two
true
true
true
example.js:9
throw combine([err1, err2])
^
Error: one
at Object.<anonymous> (example.js:3:14)
at Module._compile (internal/modules/cjs/loader.js:945:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:962:10)
at Module.load (internal/modules/cjs/loader.js:798:32)
at Function.Module._load (internal/modules/cjs/loader.js:711:12)
at Function.Module.runMain (internal/modules/cjs/loader.js:1014:10)
at internal/main/run_main_module.js:17:11
Error: two
at Object.<anonymous> (example.js:4:14)
at Module._compile (internal/modules/cjs/loader.js:945:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:962:10)
at Module.load (internal/modules/cjs/loader.js:798:32)
at Function.Module._load (internal/modules/cjs/loader.js:711:12)
at Function.Module.runMain (internal/modules/cjs/loader.js:1014:10)
at internal/main/run_main_module.js:17:11
API
combine(errors)
The errors argument must be an array.
Elements that are null or undefined are skipped. If the array is empty (after skipping null and undefined), undefined will be returned. If the array contains only 1 error, that error will be returned as-is. Otherwise, a combined error with joined messages and a lazily joined stack. Duplicate messages are skipped.
Respects transient-error and err.expected: if all errors have .transient === true then the combined error will also be transient. Same for .expected, which is useful for the following pattern:
Sets message to a joined stack, which means you can't get a human-friendly message with e.g. console.error(err.message). Removes "mostly unhelpful" internal Node.js entries from the stack.
