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node_modules/execa/lib/errname.js 976 Bytes
aaac7fed   liuqimichale   add
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  'use strict';
  // The Node team wants to deprecate `process.bind(...)`.
  //   https://github.com/nodejs/node/pull/2768
  //
  // However, we need the 'uv' binding for errname support.
  // This is a defensive wrapper around it so `execa` will not fail entirely if it stops working someday.
  //
  // If this ever stops working. See: https://github.com/sindresorhus/execa/issues/31#issuecomment-215939939 for another possible solution.
  let uv;
  
  try {
  	uv = process.binding('uv');
  
  	if (typeof uv.errname !== 'function') {
  		throw new TypeError('uv.errname is not a function');
  	}
  } catch (err) {
  	console.error('execa/lib/errname: unable to establish process.binding(\'uv\')', err);
  	uv = null;
  }
  
  function errname(uv, code) {
  	if (uv) {
  		return uv.errname(code);
  	}
  
  	if (!(code < 0)) {
  		throw new Error('err >= 0');
  	}
  
  	return `Unknown system error ${code}`;
  }
  
  module.exports = code => errname(uv, code);
  
  // Used for testing the fallback behavior
  module.exports.__test__ = errname;