All files / lib/internal/process warning.js

95.6% Statements 174/182
91.78% Branches 67/73
100% Functions 8/8
95.6% Lines 174/182

Press n or j to go to the next uncovered block, b, p or k for the previous block.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 18325x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 591x 591x 591x 591x 481x 481x     481x 2x 481x 479x 479x 481x 591x 591x 25x 25x 25x 25x 589x 589x 479x 479x 589x 589x 25x 2x 2x 2x 2x 2x 2x     2x 2x 2x 2x     2x 2x 2x 2x     2x 2x 25x 714x 714x 714x 25x 25x 592x 592x 591x 592x 591x 592x 592x 592x 592x 592x 6x 592x 585x 585x 585x 585x 585x 592x 1x 1x 592x 477x 477x 477x 477x 477x 477x 591x 592x 2x 2x 589x 592x 25x 25x 25x 25x 751x 751x 751x 10x 10x 10x 10x 10x 751x 1x 1x 1x 1x 751x 751x 751x 9x 9x 751x 181x 181x 751x 693x 743x 7x 7x 751x 181x 181x 180x 4x 4x 4x 4x 4x 4x 181x 729x 751x 25x 7x 7x 7x 25x 700x 700x 700x 700x 700x 700x 700x 700x 700x 700x 700x 700x 700x 700x 700x 25x 25x 25x 25x 25x 25x  
'use strict';
 
const {
  ArrayIsArray,
  Error,
  ErrorPrototypeToString,
  ErrorCaptureStackTrace,
  String,
} = primordials;
 
const assert = require('internal/assert');
const {
  codes: {
    ERR_INVALID_ARG_TYPE,
  },
  isErrorStackTraceLimitWritable,
} = require('internal/errors');
const { validateString } = require('internal/validators');
 
// Lazily loaded
let fs;
let fd;
let warningFile;
let options;
 
function lazyOption() {
  // This will load `warningFile` only once. If the flag is not set,
  // `warningFile` will be set to an empty string.
  if (warningFile === undefined) {
    options = require('internal/options');
    if (options.getOptionValue('--diagnostic-dir') !== '') {
      warningFile = options.getOptionValue('--diagnostic-dir');
    }
    if (options.getOptionValue('--redirect-warnings') !== '') {
      warningFile = options.getOptionValue('--redirect-warnings');
    } else {
      warningFile = '';
    }
  }
  return warningFile;
}
 
// If we can't write to stderr, we'd like to make this a noop,
// so use console.error.
let error;
function writeOut(message) {
  if (!error) {
    error = require('internal/console/global').error;
  }
  error(message);
}
 
function writeToFile(message) {
  if (fd === undefined) {
    fs = require('fs');
    try {
      fd = fs.openSync(warningFile, 'a');
    } catch {
      return writeOut(message);
    }
    process.on('exit', () => {
      try {
        fs.closeSync(fd);
      } catch {
        // Continue regardless of error.
      }
    });
  }
  fs.appendFile(fd, `${message}\n`, (err) => {
    if (err) {
      writeOut(message);
    }
  });
}
 
function doEmitWarning(warning) {
  process.emit('warning', warning);
}
 
let traceWarningHelperShown = false;
function onWarning(warning) {
  if (!(warning instanceof Error)) return;
  const isDeprecation = warning.name === 'DeprecationWarning';
  if (isDeprecation && process.noDeprecation) return;
  const trace = process.traceProcessWarnings ||
                (isDeprecation && process.traceDeprecation);
  let msg = `(${process.release.name}:${process.pid}) `;
  if (warning.code)
    msg += `[${warning.code}] `;
  if (trace && warning.stack) {
    msg += `${warning.stack}`;
  } else {
    msg +=
      typeof warning.toString === 'function' ?
        `${warning.toString()}` :
        ErrorPrototypeToString(warning);
  }
  if (typeof warning.detail === 'string') {
    msg += `\n${warning.detail}`;
  }
  if (!trace && !traceWarningHelperShown) {
    const flag = isDeprecation ? '--trace-deprecation' : '--trace-warnings';
    const argv0 = require('path').basename(process.argv0 || 'node', '.exe');
    msg += `\n(Use \`${argv0} ${flag} ...\` to show where the warning ` +
           'was created)';
    traceWarningHelperShown = true;
  }
  const warningFile = lazyOption();
  if (warningFile) {
    return writeToFile(msg);
  }
  writeOut(msg);
}
 
// process.emitWarning(error)
// process.emitWarning(str[, type[, code]][, ctor])
// process.emitWarning(str[, options])
function emitWarning(warning, type, code, ctor) {
  let detail;
  if (type !== null && typeof type === 'object' && !ArrayIsArray(type)) {
    ctor = type.ctor;
    code = type.code;
    if (typeof type.detail === 'string')
      detail = type.detail;
    type = type.type || 'Warning';
  } else if (typeof type === 'function') {
    ctor = type;
    code = undefined;
    type = 'Warning';
  }
  if (type !== undefined)
    validateString(type, 'type');
  if (typeof code === 'function') {
    ctor = code;
    code = undefined;
  } else if (code !== undefined) {
    validateString(code, 'code');
  }
  if (typeof warning === 'string') {
    warning = createWarningObject(warning, type, code, ctor, detail);
  } else if (!(warning instanceof Error)) {
    throw new ERR_INVALID_ARG_TYPE('warning', ['Error', 'string'], warning);
  }
  if (warning.name === 'DeprecationWarning') {
    if (process.noDeprecation)
      return;
    if (process.throwDeprecation) {
      // Delay throwing the error to guarantee that all former warnings were
      // properly logged.
      return process.nextTick(() => {
        throw warning;
      });
    }
  }
  process.nextTick(doEmitWarning, warning);
}
 
function emitWarningSync(warning) {
  process.emit('warning', createWarningObject(warning));
}
 
function createWarningObject(warning, type, code, ctor, detail) {
  assert(typeof warning === 'string');
  // Improve error creation performance by skipping the error frames.
  // They are added in the `captureStackTrace()` function below.
  const tmpStackLimit = Error.stackTraceLimit;
  if (isErrorStackTraceLimitWritable()) Error.stackTraceLimit = 0;
  // eslint-disable-next-line no-restricted-syntax
  warning = new Error(warning);
  if (isErrorStackTraceLimitWritable()) Error.stackTraceLimit = tmpStackLimit;
  warning.name = String(type || 'Warning');
  if (code !== undefined) warning.code = code;
  if (detail !== undefined) warning.detail = detail;
  ErrorCaptureStackTrace(warning, ctor || process.emitWarning);
  return warning;
}
 
module.exports = {
  emitWarning,
  emitWarningSync,
  onWarning,
};