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process: move setup of process warnings into node.js
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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2 files changed

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‎lib/internal/bootstrap/node.js

+9-1
Original file line numberDiff line numberDiff line change
@@ -112,7 +112,15 @@ function startup() {
112112
process.exit = wrapped.exit;
113113
}
114114

115-
NativeModule.require('internal/process/warning').setup();
115+
const {
116+
onWarning,
117+
emitWarning
118+
} = NativeModule.require('internal/process/warning');
119+
if (!process.noProcessWarnings && process.env.NODE_NO_WARNINGS !== '1') {
120+
process.on('warning', onWarning);
121+
}
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process.emitWarning = emitWarning;
123+
116124
const {
117125
nextTick,
118126
runNextTicks

‎lib/internal/process/warning.js

+74-75
Original file line numberDiff line numberDiff line change
@@ -3,8 +3,6 @@
33
const prefix = `(${process.release.name}:${process.pid}) `;
44
const { ERR_INVALID_ARG_TYPE } = require('internal/errors').codes;
55

6-
exports.setup = setupProcessWarnings;
7-
86
let options;
97
function lazyOption(name) {
108
if (!options) {
@@ -85,79 +83,80 @@ function doEmitWarning(warning) {
8583
};
8684
}
8785

88-
function setupProcessWarnings() {
89-
if (!process.noProcessWarnings && process.env.NODE_NO_WARNINGS !== '1') {
90-
process.on('warning', (warning) => {
91-
if (!(warning instanceof Error)) return;
92-
const isDeprecation = warning.name === 'DeprecationWarning';
93-
if (isDeprecation && process.noDeprecation) return;
94-
const trace = process.traceProcessWarnings ||
95-
(isDeprecation && process.traceDeprecation);
96-
var msg = prefix;
97-
if (warning.code)
98-
msg += `[${warning.code}] `;
99-
if (trace && warning.stack) {
100-
msg += `${warning.stack}`;
101-
} else {
102-
const toString =
103-
typeof warning.toString === 'function' ?
104-
warning.toString : Error.prototype.toString;
105-
msg += `${toString.apply(warning)}`;
106-
}
107-
if (typeof warning.detail === 'string') {
108-
msg += `\n${warning.detail}`;
109-
}
110-
output(msg);
111-
});
86+
function onWarning(warning) {
87+
if (!(warning instanceof Error)) return;
88+
const isDeprecation = warning.name === 'DeprecationWarning';
89+
if (isDeprecation && process.noDeprecation) return;
90+
const trace = process.traceProcessWarnings ||
91+
(isDeprecation && process.traceDeprecation);
92+
var msg = prefix;
93+
if (warning.code)
94+
msg += `[${warning.code}] `;
95+
if (trace && warning.stack) {
96+
msg += `${warning.stack}`;
97+
} else {
98+
const toString =
99+
typeof warning.toString === 'function' ?
100+
warning.toString : Error.prototype.toString;
101+
msg += `${toString.apply(warning)}`;
112102
}
103+
if (typeof warning.detail === 'string') {
104+
msg += `\n${warning.detail}`;
105+
}
106+
output(msg);
107+
}
113108

114-
// process.emitWarning(error)
115-
// process.emitWarning(str[, type[, code]][, ctor])
116-
// process.emitWarning(str[, options])
117-
process.emitWarning = (warning, type, code, ctor, now) => {
118-
let detail;
119-
if (type !== null && typeof type === 'object' && !Array.isArray(type)) {
120-
ctor = type.ctor;
121-
code = type.code;
122-
if (typeof type.detail === 'string')
123-
detail = type.detail;
124-
type = type.type || 'Warning';
125-
} else if (typeof type === 'function') {
126-
ctor = type;
127-
code = undefined;
128-
type = 'Warning';
129-
}
130-
if (type !== undefined && typeof type !== 'string') {
131-
throw new ERR_INVALID_ARG_TYPE('type', 'string', type);
132-
}
133-
if (typeof code === 'function') {
134-
ctor = code;
135-
code = undefined;
136-
} else if (code !== undefined && typeof code !== 'string') {
137-
throw new ERR_INVALID_ARG_TYPE('code', 'string', code);
138-
}
139-
if (typeof warning === 'string') {
140-
// Improve error creation performance by skipping the error frames.
141-
// They are added in the `captureStackTrace()` function below.
142-
const tmpStackLimit = Error.stackTraceLimit;
143-
Error.stackTraceLimit = 0;
144-
// eslint-disable-next-line no-restricted-syntax
145-
warning = new Error(warning);
146-
Error.stackTraceLimit = tmpStackLimit;
147-
warning.name = String(type || 'Warning');
148-
if (code !== undefined) warning.code = code;
149-
if (detail !== undefined) warning.detail = detail;
150-
Error.captureStackTrace(warning, ctor || process.emitWarning);
151-
} else if (!(warning instanceof Error)) {
152-
throw new ERR_INVALID_ARG_TYPE('warning', ['Error', 'string'], warning);
153-
}
154-
if (warning.name === 'DeprecationWarning') {
155-
if (process.noDeprecation)
156-
return;
157-
if (process.throwDeprecation)
158-
throw warning;
159-
}
160-
if (now) process.emit('warning', warning);
161-
else process.nextTick(doEmitWarning(warning));
162-
};
109+
// process.emitWarning(error)
110+
// process.emitWarning(str[, type[, code]][, ctor])
111+
// process.emitWarning(str[, options])
112+
function emitWarning(warning, type, code, ctor, now) {
113+
let detail;
114+
if (type !== null && typeof type === 'object' && !Array.isArray(type)) {
115+
ctor = type.ctor;
116+
code = type.code;
117+
if (typeof type.detail === 'string')
118+
detail = type.detail;
119+
type = type.type || 'Warning';
120+
} else if (typeof type === 'function') {
121+
ctor = type;
122+
code = undefined;
123+
type = 'Warning';
124+
}
125+
if (type !== undefined && typeof type !== 'string') {
126+
throw new ERR_INVALID_ARG_TYPE('type', 'string', type);
127+
}
128+
if (typeof code === 'function') {
129+
ctor = code;
130+
code = undefined;
131+
} else if (code !== undefined && typeof code !== 'string') {
132+
throw new ERR_INVALID_ARG_TYPE('code', 'string', code);
133+
}
134+
if (typeof warning === 'string') {
135+
// Improve error creation performance by skipping the error frames.
136+
// They are added in the `captureStackTrace()` function below.
137+
const tmpStackLimit = Error.stackTraceLimit;
138+
Error.stackTraceLimit = 0;
139+
// eslint-disable-next-line no-restricted-syntax
140+
warning = new Error(warning);
141+
Error.stackTraceLimit = tmpStackLimit;
142+
warning.name = String(type || 'Warning');
143+
if (code !== undefined) warning.code = code;
144+
if (detail !== undefined) warning.detail = detail;
145+
Error.captureStackTrace(warning, ctor || process.emitWarning);
146+
} else if (!(warning instanceof Error)) {
147+
throw new ERR_INVALID_ARG_TYPE('warning', ['Error', 'string'], warning);
148+
}
149+
if (warning.name === 'DeprecationWarning') {
150+
if (process.noDeprecation)
151+
return;
152+
if (process.throwDeprecation)
153+
throw warning;
154+
}
155+
if (now) process.emit('warning', warning);
156+
else process.nextTick(doEmitWarning(warning));
163157
}
158+
159+
module.exports = {
160+
onWarning,
161+
emitWarning
162+
};

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