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process: move setup of process warnings into node.js
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To clarify the side effects and conditions of the warning setup
during bootstrap.

PR-URL: #25263
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Minwoo Jung <minwoo@nodesource.com>
Backport-PR-URL: #26025
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@antsmartian @targos
antsmartian authored and targos committed Feb 10, 2019
1 parent 76687de commit f4cfbf4
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Showing 2 changed files with 83 additions and 76 deletions.
10 changes: 9 additions & 1 deletion lib/internal/bootstrap/node.js
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Original file line number Diff line number Diff line change
Expand Up @@ -112,7 +112,15 @@ function startup() {
process.exit = wrapped.exit;
}

NativeModule.require('internal/process/warning').setup();
const {
onWarning,
emitWarning
} = NativeModule.require('internal/process/warning');
if (!process.noProcessWarnings && process.env.NODE_NO_WARNINGS !== '1') {
process.on('warning', onWarning);
}
process.emitWarning = emitWarning;

const {
nextTick,
runNextTicks
Expand Down
149 changes: 74 additions & 75 deletions lib/internal/process/warning.js
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Original file line number Diff line number Diff line change
Expand Up @@ -3,8 +3,6 @@
const prefix = `(${process.release.name}:${process.pid}) `;
const { ERR_INVALID_ARG_TYPE } = require('internal/errors').codes;

exports.setup = setupProcessWarnings;

let options;
function lazyOption(name) {
if (!options) {
Expand Down Expand Up @@ -85,79 +83,80 @@ function doEmitWarning(warning) {
};
}

function setupProcessWarnings() {
if (!process.noProcessWarnings && process.env.NODE_NO_WARNINGS !== '1') {
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);
var msg = prefix;
if (warning.code)
msg += `[${warning.code}] `;
if (trace && warning.stack) {
msg += `${warning.stack}`;
} else {
const toString =
typeof warning.toString === 'function' ?
warning.toString : Error.prototype.toString;
msg += `${toString.apply(warning)}`;
}
if (typeof warning.detail === 'string') {
msg += `\n${warning.detail}`;
}
output(msg);
});
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);
var msg = prefix;
if (warning.code)
msg += `[${warning.code}] `;
if (trace && warning.stack) {
msg += `${warning.stack}`;
} else {
const toString =
typeof warning.toString === 'function' ?
warning.toString : Error.prototype.toString;
msg += `${toString.apply(warning)}`;
}
if (typeof warning.detail === 'string') {
msg += `\n${warning.detail}`;
}
output(msg);
}

// process.emitWarning(error)
// process.emitWarning(str[, type[, code]][, ctor])
// process.emitWarning(str[, options])
process.emitWarning = (warning, type, code, ctor, now) => {
let detail;
if (type !== null && typeof type === 'object' && !Array.isArray(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') {
// 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;
Error.captureStackTrace(warning, ctor || process.emitWarning);
} 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)
throw warning;
}
if (now) process.emit('warning', warning);
else process.nextTick(doEmitWarning(warning));
};
// process.emitWarning(error)
// process.emitWarning(str[, type[, code]][, ctor])
// process.emitWarning(str[, options])
function emitWarning(warning, type, code, ctor, now) {
let detail;
if (type !== null && typeof type === 'object' && !Array.isArray(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') {
// 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;
Error.captureStackTrace(warning, ctor || process.emitWarning);
} 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)
throw warning;
}
if (now) process.emit('warning', warning);
else process.nextTick(doEmitWarning(warning));
}

module.exports = {
onWarning,
emitWarning
};

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