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process: add emitExperimentalWarning function #16497

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process: add emitExperimentalWarning function #16497

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11 changes: 11 additions & 0 deletions lib/internal/util.js
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,8 @@ const {

const noCrypto = !process.versions.openssl;

const experimentalWarnings = new Set();

function isError(e) {
return objectToString(e) === '[object Error]' || e instanceof Error;
}
Expand Down Expand Up @@ -120,6 +122,14 @@ function normalizeEncoding(enc) {
}
}

function emitExperimentalWarning(feature) {
if (experimentalWarnings.has(feature)) return;
const msg = `${feature} is an experimental feature. This feature could ` +
'change at any time';
experimentalWarnings.add(feature);
process.emitWarning(msg, 'ExperimentalWarning');
}

function filterDuplicateStrings(items, low) {
const map = new Map();
for (var i = 0; i < items.length; i++) {
Expand Down Expand Up @@ -290,6 +300,7 @@ module.exports = {
createClassWrapper,
decorateErrorStack,
deprecate,
emitExperimentalWarning,
filterDuplicateStrings,
getConstructorOf,
isError,
Expand Down