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GeezerVison is showing github.com — util: add getSystemErrorMap() impl · nodejs/node@08a6d9e

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doc/api
- util.md
lib
- internal
  - util.js
- util.js
test/parallel
- test-uv-errmap.js

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`‎doc/api/util.md‎`

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+19Lines changed: 19 additions & 0 deletions

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Original file line number	Diff line number	Diff line change
`@@ -376,6 +376,25 @@ fs.access('file/that/does/not/exist', (err) => {`
`376`	`376`	`});`
`377`	`377`	```
`378`	`378`
	`379`	+## `util.getSystemErrorMap()`
	`380`	`+<!-- YAML`
	`381`	`+added: REPLACEME`
	`382`	`+-->`
	`383`	`+`
	`384`	`+* Returns: {Map}`
	`385`	`+`
	`386`	`+Returns a Map of all system error codes available from the Node.js API.`
	`387`	`+The mapping between error codes and error names is platform-dependent.`
	`388`	`+See [Common System Errors][] for the names of common errors.`
	`389`	`+`
	`390`	+```js
	`391`	`+fs.access('file/that/does/not/exist', (err) => {`
	`392`	`+ const errorMap = util.getSystemErrorMap();`
	`393`	`+ const name = errorMap.get(err.errno);`
	`394`	`+ console.error(name); // ENOENT`
	`395`	`+});`
	`396`	+```
	`397`	`+`
`379`	`398`	## `util.inherits(constructor, superConstructor)`
`380`	`399`	`<!-- YAML`
`381`	`400`	`added: v0.3.0`

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`‎lib/internal/util.js‎`

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+12Lines changed: 12 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -44,6 +44,13 @@ const experimentalWarnings = new Set();`
`44`	`44`
`45`	`45`	`const colorRegExp = /\u001b\[\d\d?m/g; // eslint-disable-line no-control-regex`
`46`	`46`
	`47`	`+let uvBinding;`
	`48`	`+`
	`49`	`+function lazyUv() {`
	`50`	`+ uvBinding = uvBinding ?? internalBinding('uv');`
	`51`	`+ return uvBinding;`
	`52`	`+}`
	`53`	`+`
`47`	`54`	`function removeColors(str) {`
`48`	`55`	`return str.replace(colorRegExp, '');`
`49`	`56`	`}`
`@@ -271,6 +278,10 @@ function getSystemErrorName(err) {`
`271`	`278`	return entry ? entry[0] : `Unknown system error ${err}`;
`272`	`279`	`}`
`273`	`280`
	`281`	`+function getSystemErrorMap() {`
	`282`	`+ return lazyUv().getErrorMap();`
	`283`	`+}`
	`284`	`+`
`274`	`285`	`const kCustomPromisifiedSymbol = SymbolFor('nodejs.util.promisify.custom');`
`275`	`286`	`const kCustomPromisifyArgsSymbol = Symbol('customPromisifyArgs');`
`276`	`287`
`@@ -414,6 +425,7 @@ module.exports = {`
`414`	`425`	`emitExperimentalWarning,`
`415`	`426`	`filterDuplicateStrings,`
`416`	`427`	`getConstructorOf,`
	`428`	`+ getSystemErrorMap,`
`417`	`429`	`getSystemErrorName,`
`418`	`430`	`isError,`
`419`	`431`	`isInsideNodeModules,`

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`‎lib/util.js‎`

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+2Lines changed: 2 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -57,6 +57,7 @@ const types = require('internal/util/types');`
`57`	`57`
`58`	`58`	`const {`
`59`	`59`	`deprecate,`
	`60`	`+ getSystemErrorMap,`
`60`	`61`	`getSystemErrorName: internalErrorName,`
`61`	`62`	`promisify`
`62`	`63`	`} = require('internal/util');`
`@@ -244,6 +245,7 @@ module.exports = {`
`244`	`245`	`deprecate,`
`245`	`246`	`format,`
`246`	`247`	`formatWithOptions,`
	`248`	`+ getSystemErrorMap,`
`247`	`249`	`getSystemErrorName,`
`248`	`250`	`inherits,`
`249`	`251`	`inspect,`

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`‎test/parallel/test-uv-errmap.js‎`

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+24Lines changed: 24 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,24 @@`
	`1`	`+// Flags: --expose-internals`
	`2`	`+'use strict';`
	`3`	`+`
	`4`	`+require('../common');`
	`5`	`+const assert = require('assert');`
	`6`	`+const {`
	`7`	`+ getSystemErrorMap,`
	`8`	`+ _errnoException`
	`9`	`+} = require('util');`
	`10`	`+`
	`11`	`+const { internalBinding } = require('internal/test/binding');`
	`12`	`+const uv = internalBinding('uv');`
	`13`	`+const uvKeys = Object.keys(uv);`
	`14`	`+`
	`15`	`+const errMap = getSystemErrorMap();`
	`16`	`+`
	`17`	`+uvKeys.forEach((key) => {`
	`18`	`+ if (!key.startsWith('UV_'))`
	`19`	`+ return;`
	`20`	`+`
	`21`	`+ const err = _errnoException(uv[key]);`
	`22`	`+ const name = uv.errname(uv[key]);`
	`23`	`+ assert.strictEqual(errMap.get(err.errno)[0], name);`
	`24`	`+});`

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