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process: refactor emitWarning #20726

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process: refactor emitWarning #20726

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16 changes: 8 additions & 8 deletions lib/internal/process/warning.js
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Original file line number Diff line number Diff line change
Expand Up @@ -105,7 +105,7 @@ function setupProcessWarnings() {
// process.emitWarning(str[, type[, code]][, ctor])
// process.emitWarning(str[, options])
process.emitWarning = function(warning, type, code, ctor, now) {
var detail;
let detail;
if (type !== null && typeof type === 'object' && !Array.isArray(type)) {
ctor = type.ctor;
code = type.code;
Expand All @@ -117,23 +117,23 @@ function setupProcessWarnings() {
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;
}
if (code !== undefined && typeof code !== 'string')
} else if (code !== undefined && typeof code !== 'string') {
throw new ERR_INVALID_ARG_TYPE('code', 'string', code);
if (type !== undefined && typeof type !== 'string')
throw new ERR_INVALID_ARG_TYPE('type', 'string', type);
if (warning === undefined || typeof warning === 'string') {
}
if (typeof warning === 'string') {
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This removes the possibility of an undefined warning that has the other properties specified.

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That is not officially supported.

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@apapirovski apapirovski May 14, 2018 •
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While not documented, as far as I can tell this was requested in #4782

It has also worked this way for two years... I don't know what usage people have for this or what they're passing to it. It might very well be a breaking change.

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I agree with @apapirovski on this. This is a breaking change even if not properly documented.

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@BridgeAR BridgeAR May 17, 2018 •
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process.emitWarning() produces: (node:XXXX) Warning. I am not convinced that this is useful at all. This seems like a bugfix as no args should result in an error. Therefore I would say it is a patch. However, I would also keep this if it makes this semver-major.

Ping @nodejs/tsc please also give an opinion.

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process.emitWarning() produces: (node:XXXX) Warning. I am not convinced that this is useful at all.

process.emitWarning(undefined, 'fhqwhgads', 'come-on') produces the slightly more useful (node:91812) [come-on] fhqwhgads.

I have no idea if anyone uses that pattern or not. Maybe it's time for me to figure out how to use Gzemnid.

In the spirit of the onboarding-extras.md:

be conservative – that is, if a change has the remote chance of breaking something, go for semver-major

It seems like this should be semver-major as it has a "remote change of breaking something".

(If we're not going to call this semver-major, I won't push back, but we really ought to remove the quoted sentence above from the doc since it is clearly not something we abide by in that case.)

// eslint-disable-next-line no-restricted-syntax
warning = new Error(warning);
warning.name = String(type || 'Warning');
if (code !== undefined) warning.code = code;
if (detail !== undefined) warning.detail = detail;
Error.captureStackTrace(warning, ctor || process.emitWarning);
}
if (!(warning instanceof Error)) {
} else if (!(warning instanceof Error)) {
throw new ERR_INVALID_ARG_TYPE('warning', ['Error', 'string'], warning);
}
if (warning.name === 'DeprecationWarning') {
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39 changes: 23 additions & 16 deletions test/parallel/test-process-emitwarning.js
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Expand Up @@ -43,8 +43,8 @@ class CustomWarning extends Error {
[testMsg, { type: testType, code: testCode, detail: [] }],
[testMsg, { type: testType, code: testCode, detail: null }],
[testMsg, { type: testType, code: testCode, detail: 1 }]
].forEach((i) => {
process.emitWarning.apply(null, i);
].forEach((args) => {
process.emitWarning(...args);
});

const warningNoToString = new CustomWarning();
Expand All @@ -57,18 +57,25 @@ warningThrowToString.toString = function() {
};
process.emitWarning(warningThrowToString);

const expectedError =
common.expectsError({ code: 'ERR_INVALID_ARG_TYPE', type: TypeError }, 11);

// TypeError is thrown on invalid input
assert.throws(() => process.emitWarning(1), expectedError);
assert.throws(() => process.emitWarning({}), expectedError);
assert.throws(() => process.emitWarning(true), expectedError);
assert.throws(() => process.emitWarning([]), expectedError);
assert.throws(() => process.emitWarning('', '', {}), expectedError);
assert.throws(() => process.emitWarning('', 1), expectedError);
assert.throws(() => process.emitWarning('', '', 1), expectedError);
assert.throws(() => process.emitWarning('', true), expectedError);
assert.throws(() => process.emitWarning('', '', true), expectedError);
assert.throws(() => process.emitWarning('', []), expectedError);
assert.throws(() => process.emitWarning('', '', []), expectedError);
[
[1],
[{}],
[true],
[[]],
['', '', {}],
['', 1],
['', '', 1],
['', true],
['', '', true],
['', []],
['', '', []],
[],
[undefined, 'foo', 'bar'],
[undefined]
].forEach((args) => {
common.expectsError(
() => process.emitWarning(...args),
{ code: 'ERR_INVALID_ARG_TYPE', type: TypeError }
);
});