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warning.js
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warning.js
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'use strict';
const prefix = `(${process.release.name}:${process.pid}) `;
exports.setup = setupProcessWarnings;
function setupProcessWarnings() {
if (!process.noProcessWarnings) {
process.on('warning', (warning) => {
if (!(warning instanceof Error)) return;
const isDeprecation = warning.name === 'DeprecationWarning';
if (isDeprecation && process.noDeprecation) return;
const trace = process.traceProcessWarnings ||
(isDeprecation && process.traceDeprecation);
if (trace && warning.stack) {
console.error(`${prefix}${warning.stack}`);
} else {
var toString = warning.toString;
if (typeof toString !== 'function')
toString = Error.prototype.toString;
console.error(`${prefix}${toString.apply(warning)}`);
}
});
}
// process.emitWarning(error)
// process.emitWarning(str[, name][, ctor])
process.emitWarning = function(warning, name, ctor) {
if (typeof name === 'function') {
ctor = name;
name = 'Warning';
}
if (warning === undefined || typeof warning === 'string') {
warning = new Error(warning);
warning.name = name || 'Warning';
Error.captureStackTrace(warning, ctor || process.emitWarning);
}
if (!(warning instanceof Error)) {
throw new TypeError('\'warning\' must be an Error object or string.');
}
if (warning.name === 'DeprecationWarning') {
if (process.noDeprecation)
return;
if (process.throwDeprecation)
throw warning;
}
process.nextTick(() => process.emit('warning', warning));
};
}