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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,
};
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