All files / lib/internal/process warning.js

96.57% Statements 169/175
92% Branches 69/75
100% Functions 8/8
96.57% Lines 169/175

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 17619x 19x 19x 19x 19x 19x 19x 19x 19x 19x 19x 19x 19x 19x 19x 19x 19x 19x 19x 450x 450x 450x 450x 380x 380x     380x 2x 380x 378x 378x 380x 450x 450x 19x 19x 19x 19x 448x 448x 378x 378x 448x 448x 19x 2x 2x 2x 2x 2x 2x     2x 2x 2x 2x 2x 2x 2x 2x     2x 2x 19x 533x 533x 533x 19x 19x 451x 451x 450x 451x 450x 451x 451x 451x 451x 451x 6x 451x 444x 444x 444x 444x 444x 451x 1x 1x 451x 376x 376x 376x 376x 376x 376x 450x 451x 2x 2x 448x 451x 19x 19x 19x 19x 566x 566x 566x 9x 9x 9x 9x 9x 566x 1x 1x 1x 1x 566x 3x 3x 566x 9x 9x 566x 4x 4x 566x 510x 560x 7x 7x 566x 144x 144x 143x 3x 3x 3x 3x 3x 3x 144x 545x 566x 19x 7x 7x 7x 19x 517x 517x 517x 517x 517x 517x 517x 517x 517x 517x 517x 517x 517x 517x 517x 19x 19x 19x 19x 19x 19x  
'use strict';
 
const {
  ArrayIsArray,
  Error,
  ErrorPrototypeToString,
  ErrorCaptureStackTrace,
  String,
} = primordials;
 
const assert = require('internal/assert');
const { ERR_INVALID_ARG_TYPE } = require('internal/errors').codes;
 
// 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 {}
    });
  }
  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 && typeof type !== 'string') {
    throw new ERR_INVALID_ARG_TYPE('type', 'string', type);
  }
  if (typeof code === 'function') {
    ctor = code;
    code = undefined;
  } else if (code !== undefined && typeof code !== 'string') {
    throw new ERR_INVALID_ARG_TYPE('code', 'string', 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;
  Error.stackTraceLimit = 0;
  // eslint-disable-next-line no-restricted-syntax
  warning = new Error(warning);
  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,
};