ESLint rules using Regular Expression
npm install eslint-plugin-regex







__________________
1 . Add dependencies:
package.json:
``json`
"engines" : {
"node" : ">=6.0.0"
},
"devDependencies": {
"eslint": ">=4.0.0",
"eslint-plugin-regex": "1.10.0",
2 . Configure eslint:
Short configuration:
.eslintrc.json:
`json`
{
"plugins": [
"regex"
],
"rules": {
"regex/invalid": [
"error", [
"invalidRegex1",
"invalidRegexN"
]
],
"regex/required": [
"error", [
"requiredRegex1",
"requiredRegexN"
],
"ignoreFilesRegex"
]
}
}
Files will be checked for the absence of invalidRegex1 and invalidRegexN, and for the presence of requiredRegex1 and requiredRegexN, and files with name matching ignoreFilesRegex will not be checked.
Detailed configuration:
.eslintrc.json:
`json`
{
"plugins": [
"regex"
],
"rules": {
"regex/invalid": [
"error", [{
"regex": "invalidRegex1",
"replacement": "newValue"
}, {
"id": "regexIdN",
"message": "errorMessageN",
"regex": "invalidRegexN",
"files": {
"ignore": "ignoreFilesRegexN"
}
}
]
],
"regex/required": [
"error", [{
"id": "regexId1",
"regex": "requiredRegex1",
"message": "errorMessage1",
"files": {
"inspect": "inspectFilesRegex1"
}
}, {
"regex": "requiredRegexN",
"files": {
"ignore": "ignoreFilesRegexA",
"inspect": "inspectFilesRegexZ"
}
}
]
]
}
}
Files will be checked for:
* The absence of invalidRegex1 but if found it will be replaced with newValue.invalidRegexN
* The absence of only in files with name not matching ignoreFilesRegexN, but if found errorMessageN will be shown.requiredRegex1
* The presence of only in files with name matching inspectFilesRegex1, but if not found errorMessage1 will be shown.requiredRegexN
* The presence of only in files with name matching inspectFilesRegexA and not matching ignoreFilesRegexZ.
__________________
The idea is to allow the creation of different eslint rules based on Regular Expressions in order to have some "freedom" to create quick ESLint custom rules.
Name | Fixable | Description
----------------------------------------------------- | ------- | -----------
regex/invalid | Yes | checks that specified patterns are not found
regex/required | No | checks that specified patterns are found
Each rule defines a set of patterns:
This rule checks that specified patterns are not found in files, i.e. Invalid patterns.
✏ Example of incorrect code for this rule:
`javascript
/ eslint regex/invalid: ['error', ['"']] /
const text = 'Hello "My Friend"'
`
The error message will reflect the exact location, e.g.:
`bash`
/path/to/some.js
34:25 error Invalid regular expression /"/gm found regex/invalid
✏ Example of correct code for this rule:
`javascript
/ eslint regex/invalid: ['error', ['"']] /
const text = 'Hello \'My Friend\''
`
This rule looks for specific patterns that must be present in each file, i.e. Required patterns.
✏ Example of incorrect code for this rule:
`javascript
/ eslint regex/required: ["error", ["^// Copyright My Friend"]] /
const text = 'Hello "My Friend"'
`
The error message will point to the beginning of the file, e.g.:
`sh`
/path/to/some.js
1:1 error Required regular expression /^\/\/ Copyright My Friend/gm not found in file regex/required
✏ Example of correct code for this rule:
`javascript
/ eslint regex/required: ["error", ["^// Copyright My Friend"]] /
// Copyright My Friend
const text = 'Hello "My Friend"'
`
Both rule has two options:
* array of patterns definitions to analyze. [REQUIRED]
* Each pattern definition can be 'Short' or 'Detailed'.
* a string representing the regular expression for ignoring files for all patterns. [OPTIONAL]
`json`
[
"error",
[
"regex1",
"regexN"
],
"ignoreFilesRegex"
]
#### The string representing the regular expression
Remember, Slashes (/) are not required in the string that defines the regex,
e.g. To get the following regex /^(test|spec)$/, define:
* "^(test|spec)$", when using .eslintrc.js or .eslintrc.json.
e.g. To get the following regex /\bhttp:/, define:
* "\bhttp:", when using .eslintrc.js, or"\\bhttp:"
* , when using .eslintrc.json. (backslash needs to be double in a json file)
e.g. To get the following regex /.*test\.js/, define:
".test\.js", when using .eslintrc.js, or".test\\.js"
, when using .eslintrc.json. (backslash needs to be double in a json file)
#### Short pattern definition
Each pattern is specified by just a string representing the regular expression, i.e. "regex"
`json`
{
"regex/invalid": [
"error",
[
"invalidRegex1",
"invalidRegexN"
]
],
"regex/required": [
"error",
[
"requiredRegex1",
"requiredRegexN"
]
]
}
#### Detailed pattern definition
It is specified by an object, with the following fields:
* regex: A required string for regex/required and regex/invalid representing the Regular expression to look for. [REQUIRED]flags
* : A combination of flags, i, s and/or u, to be used by the Regular Expression. [OPTIONAL]replacement
* for regex/invalid [1]: [OPTIONAL]string
* An optional used to replace the invalid found pattern, orobject
* An optional that establish how the invalid found pattern will be replaced:function
* : used to replace the invalid found pattern.text
* It will receive 3 parameters: , captured and $, that can be used as desired.string
* It must return a value, if not, return value will be ignored.string
* Its definition must be only the body of the function.
* One must be defined, either the or function.id
* : An optional string representing the Pattern Id. [OPTIONAL]message
* : An optional string specifying the Message to be shown when an error happens (invalid regex is found or required regex is not found). [OPTIONAL]files
* : An optional object specifying which files to analyze: [OPTIONAL]ignore
* : A string representing Regular expression of the files to be ignored when validating this specific pattern.inspect
* : A string representing Regular expression of the files to be inspected when validating this specific pattern.
`json`
{
"id": "regexId",
"regex": "regex",
"flags": "isu",
"replacement": "replacementString",
"message": "errorMessage",
"files": {
"ignore": "ignoreFilesRegex",
"inspect": "inspectFilesRegex"
}
}
> * regex is the only Required field.ignore
> * When and inspect are present, ignore takes precedence.files
> * Global ignore file pattern, takes precedence over patterns.eslint
>
> [1] In order to fix issues must be run with --fix option.
Using message is pretty useful since it will give a better understanding to the developer when an error happens:
e.g. Given the following definition:
`json`
{
"regex": "someRegex",
"message": "The Useful Error MessagE"
}
then shown error will be similar to:
`sh`
/path/to/some.js
1:1 error The Useful Error MessagE regex/required
or
`bash`
/path/to/some.js
34:25 error The Useful Error MessagE regex/invalid
instead of
`sh`
/path/to/some.js
1:1 error Required regular expression /someRegex/gm not found in file regex/required
or
`bash`
/path/to/some.js
34:25 error Invalid regular expression /someRegex/gm found regex/invalid
##### Definition of the Function used to replace the invalid found pattern
Definition of the function must be done as a string in 1 line, and the following rules apply:
* It must return a string value, if not, return value will be ignored, i.e. it will silently fail.return
* Its definition must be only the body of the function.
For "simple" functions where the is found at the beginning of the body of the function and the exact word return* is not present, return can be omitted.
* If the function has invalid Javascript code, the function will be ignored, i.e. it will silently fail.
Function will receive 3 parameters, to be used as desired:
* text: a string with the value of the invalid text found.captured
* : an array of strings with the values of the captured groups for the regex.$
* : an array of strings, with the value of the invalid text found plus the values of the captured groups for the regex, i.e.$[0]
* = text: a string with the value of the invalid text found.$[1..]
* = captured: an array of strings with the values of the captured groups for the regex.$[1]
* = captured[0] and so on.
* It allows smaller definitions.
Using parameter text
e.g.
`javascript`
function(text, captured, $) {
return text.trim()
}
"return text.trim()" => only the body of the function + returns a string value based on text
Having the following rule in .eslintrc.json:
`json`
{
"id": "regexIdN",
"regex": "\\serror\\w*\\s",
"replacement": {
"function": "return text.trim()"
}
}
or using $:
`json`
{
"id": "regexIdN",
"regex": "\\serror\\w*\\s",
"replacement": {
"function": "return $[0].trim()"
}
}
then, given:
example.js
`javascript`
const exception = " error19 "
when linting with fix, the result will be:
`javascript`
const exception = "error19"
As the body of the function is "simple", i.e. the return is found at the beginning of the body of the function, and besides, the word return is not present, then the definition could be done as:
`json`
{
"id": "regexIdN",
"regex": "\\serror\\w*\\s",
"replacement": {
"function": "text.trim()"
}
}
or
`json`
{
"id": "regexIdN",
"regex": "\\serror\\w*\\s",
"replacement": {
"function": "$[0].trim()"
}
}
Using parameter captured
e.g.
"return captured[0]" => only the body of the function + returns a string value based on captured
Having the following rule in .eslintrc.json:
`json`
{
"id": "regexIdN",
"regex": "\\serror(\\w*)\\s",
"replacement": {
"function": "return captured[0]"
}
}
or using $:
`json`
{
"id": "regexIdN",
"regex": "\\serror(\\w*)\\s",
"replacement": {
"function": "return $[1]"
}
}
then, given:
example.js
`javascript`
const exception = " error19 "
when linting with fix, the result will be:
`javascript`
const exception = "19"
As the body of the function is "simple", i.e. the return is found at the beginning of the body of the function, and besides, the word return is not present, then the definition could be done as:
`json`
{
"id": "regexIdN",
"regex": "\\serror(\\w*)\\s",
"replacement": {
"function": "captured[0]"
}
}
or
`json`
{
"id": "regexIdN",
"regex": "\\serror(\\w*)\\s",
"replacement": {
"function": "$[1]"
}
}
Using parameters text and captured
e.g.
"return text + ' = ' + captured[0] + ' + ' + captured[1] + ' = ' + (parseInt(captured[0]) + parseInt(captured[1]))" => only the body of the function + returns a string value based on text and captured
Having the following rule in .eslintrc.json:
`json`
{
"id": "regexIdN",
"regex": "(\\d+)\\+(\\d+)",
"replacement": {
"function": "return text + ' = ' + captured[0] + ' + ' + captured[1] + ' = ' + (parseInt(captured[0]) + parseInt(captured[1]))"
}
}
or using $:
`json`
{
"id": "regexIdN",
"regex": "(\\d+)\\+(\\d+)",
"replacement": {
"function": "return $[0] + ' = ' + $[1] + ' + ' + $[2] + ' = ' + (parseInt($[1]) + parseInt($[2]))"
}
}
or :
`json`
{
"id": "regexIdN",
"regex": "(\\d+)\\+(\\d+)",
"replacement": {
"function": "return text + ' = ' + $[1] + ' + ' + $[2] + ' = ' + (parseInt($[1]) + parseInt($[2]))"
}
}
or :
`json${text} = ${captured[0]} + ${captured[1]} = ${parseInt($[1]) + parseInt($[2])}
{
"id": "regexIdN",
"regex": "(\\d+)\\+(\\d+)",
"replacement": {
"function": "return "`
}
}
then, given:
example.js
`javascript`
const sum = "4+5"
when linting with fix, the result will be:
`javascript`
const sum = "4+5 = 4 + 5 = 9"
As the body of the function is "simple", i.e. the return is found at the beginning of the body of the function, and besides, the word return is not present, then the definition could be done as:
`json`
{
"id": "regexIdN",
"regex": "(\\d+)\\+(\\d+)",
"replacement": {
"function": "text + ' = ' + $[1] + ' + ' + $[2] + ' = ' + (parseInt($[1]) + parseInt($[2]))"
}
}
or :
`json${text} = ${captured[0]} + ${captured[1]} = ${parseInt($[1]) + parseInt($[2])}
{
"id": "regexIdN",
"regex": "(\\d+)\\+(\\d+)",
"replacement": {
"function": ""`
}
}
When return keyword is required
e.g.
e.g. const result = text === 'superb' ? 'Superb' : text; return result => only the body of the function + returns a string value based on text.
Since the return is not found at the beginning of the body of the function, return cannot be omitted, then rule definition will be as usual:
`json`
{
"id": "regexIdN",
"regex": "\\w+",
"replacement": {
"function": "const result = text === 'superb' ? 'Superb' : text; return result"
}
}
> Some cases may use Comma operator, e.g. "function": "result = text === 'superb' ? 'Superb' : text, result"
e.g. return text === 'return' ? 'Return' : text => only the body of the function + returns a string value based on text.
Since the exact word return is present, this will required return, then rule definition will be as usual:
`json`
{
"id": "regexIdN",
"regex": "\\w+",
"replacement": {
"function": "return text === 'return' ? 'Return' : text"
}
}
Following case does not required return:
e.g. return text === 'Return' ? 'RETURN' : text => only the body of the function + returns a string value based on text.
Since the exact word return is not present, this will allow the following rule definition to be:
`json`
{
"id": "regexIdN",
"regex": "\\w+",
"replacement": {
"function": "text === 'Return' ? 'RETURN' : text"
}
}
###### Debugging of the Replacement Function for invalid found pattern
* It is possible to add console statements to print some information in the Replacement Function.
`json`
{
"regex": "\\serror(\\w*)\\s",
"replacement": {
"function": "const extract = captured[0]; console.log(extract); return extract"
}
}
##### RegExp Flags
The following flags can be add to the regex:
* i: For case insensitive search.s
* : To allow . to match newline characters.u
* : To treat the regex as a sequence of unicode code points.
To define the flags to be used, employ the field flags in the detailed pattern:
* A combination of flags can be used, e.g. "is"."si"
* Order of flags is irrelevant, e.g. ."iS"
* It's case insensitive, e.g. , "Is" and "IS" are the same.
* Invalid flags will be reported as an error by eslint.
> By default, "gm" is always added by the engine (since It's required).
e.g.
Having the following detailed pattern:
`json`
{
"regex": "invalid",
"flags": "i"
}
Invalid, inValid, INvalid or INVALID will match.
Internally, each string from the array will be converted into a Regular Expression with global and multiline options, e.g.:
"someRegex" will be transformed into /someRegex/gm
> Remember that backslash needs to be double in strings of a json file, e.g. To get the following regex /\bhttp:/ define the following string "\\bhttp:".
For some special cases when using meta characters that may result in an empty match, e.g. ^, eslint-plugin-regex will report only the first case found, and after that case is fixed, the following will be report, if present.
e.g.
`json`
{
"regex": "^(?!(?:(feature|fix|docs|config|refactor|revert|test).[\\.:]$)|(\\\\s\\w.*\\.$)|$)"
}
/path/to/some.js:
`text
config(ALL):
* Use eslint-plugin-regex for commit message linting
* Use eslint-plugin-regex for commit message linting
`
When linting, eslint-plugin-regex will only report the first case:
`bash`
/path/to/some.js
3:1 error Invalid regular expression /^(?!(?:(feature|fix|docs|config|refactor|revert|test).[\\.:]$)|(\\\\s\\w.*\\.$)|$)/gm found regex/invalid
4:1 error will not be reported until 3:1 is fixed.
> The issue is that having an empty match does not allow the regex engine to move forward.
The 'Short pattern definition' errors are reported with the following structure:
Given someRegex, the following message will be shown on error:
``
Invalid regular expression /someRegex/gm found
or
``
Required regular expression /someRegex/gm not found in file
The 'Detailed pattern definition' errors are reported with the following rules:
A . If message is present then that exact message is reported. id
B . If is present then:
Given "id": "someRegexId", the following message will be shown on error:
``
Invalid regular expression 'someRegexId' found
or
``
Required regular expression 'someRegexId' not found in file
C . If neither message nor id is present then the 'Short pattern definition' error message is shown.
> * message takes precedence over id. id
> * Although is a quick solution (and useful when creating and testing a rule), using message will give more information to the team about the issue.
#### Mixing pattern types
It is possible to use both type of definitions, 'Short pattern definition' with 'Detailed pattern definition', in the array of patterns.
.eslintrc.json:
`json`
{
"plugins": [
"regex"
],
"rules": {
"regex/invalid": [
"error", [
"invalidRegex1",
"invalidRegex2",
{
"regex": "invalidRegex3",
"message": "errorMessage1",
"files": {
"inspect": "inspectFilesRegex1"
}
},
{
"id": "regexIdN",
"regex": "invalidRegexN",
"files": {
"ignore": "ignoreFilesRegexN"
}
}
]
]
}
}
* invalidRegex1 and invalidRegex2 are 'Short pattern definition'.invalidRegex3
* and invalidRegexN are 'Detailed pattern definition'.
#### Mixing rules
##### Mixing error levels
Rules names have synonyms:
regex/invalid = regex/invalid-warn = regex/invalid-error = regex/another-invalid = regex/other-invalid.
regex/required = regex/required-warn = regex/required-error = regex/another-required = regex/other-required.
* Synonyms are just that, synonyms, do not imply any level of error, but some are provided to increase readability, e.g. regex/invalid-warn does not imply warn level.
* This will allow to mix different error levels.
It is possible to set different error level: error, warn and off. For this use a synonym for the regex rule name:
.eslintrc.json:
`json`
{
"plugins": [
"regex"
],
"rules": {
"regex/invalid": [
"error",
[
"invalidRegex1",
"invalidRegexN"
]
],
"regex/required": [
"error",
[
"requiredRegex1",
"requiredRegexN"
]
],
"regex/invalid-error": [
"error", [
"invalidRegexA1",
"invalidRegexA2",
{
"regex": "invalidRegexA3",
"message": "errorMessage1",
"files": {
"inspect": "inspectFilesRegexA1"
}
},
{
"id": "regexIdN",
"regex": "invalidRegexN",
"files": {
"ignore": "ignoreFilesRegexAN"
}
}
],
],
"regex/invalid-warn": [
"warn", [
"invalidRegexB1",
"invalidRegexB2",
{
"regex": "invalidRegexB3",
"message": "errorMessage1",
"files": {
"inspect": "inspectFilesRegex1"
}
},
{
"id": "regexIdN",
"regex": "invalidRegexBN",
"files": {
"ignore": "ignoreFilesRegexN"
}
}
],
],
"regex/other-invalid": [
"off", [
"invalidRegexC1",
"invalidRegexC2",
{
"regex": "invalidRegexB3",
"message": "errorMessage1",
"files": {
"inspect": "inspectFilesRegexC1"
}
},
{
"id": "regexIdN",
"regex": "invalidRegexBN",
"files": {
"ignore": "ignoreFilesRegexCN"
}
}
],
],
"regex/required-warn": [
"warn",
[
"requiredRegexA1",
"requiredRegexAN"
]
]
}
}
* Rules with invalid patterns and error level: regex/invalid and regex/invalid-error.off
* Rules with invalid patterns and level: regex/other-invalid.error
* Rules with required patterns and level: regex/required.warn
* Rules with required patterns and level: regex/required-warn.
##### Custom set of regex rules
Creating and Using a Custom Set of regex rules requires using js files.
###### Named Regex Rules approach
A regex rule can be named with a custom name. The Rule name can be anything that includes invalid, disuse, avoid, required or use, ignoring letter case, and with the restrictions of predefined names (invalid, disuse, avoid, invalid-warn, invalid-error, another-invalid, other-invalid, required, use, required-warn, required-error, another-required and other-required).
regex/invalid, regex/disuse or regex/avoid* for invalid patterns.regex/required
or regex/use* for required patterns.
> In the name invalid, disuse and avoid will take precedence over required and use, e.g. If custom regex rule name has both avoid and use in the name, then the respective regex patterns will be consider invalid patterns.
addRegexRuleName must be used to add the custom regex rule name to the set of eslint-plugin-regex rules.
`javascript
const { addRegexRuleName } = require('eslint-plugin-regex')
addRegexRuleName('invalid')
addRegexRuleName('required')
`
* If the custom regex rule name is already defined, then an error will be shown:
`sh`
Error: Cannot read config file: /path/to/.eslintrc.js
Error: "SomeRuleName" already defined as eslint-plugin-regex rule name
Local Custom Regex rules
Create a local .eslintrc.js:
1 . Add rule name using addRegexRuleName. eslint-plugin-regex
2 . Define custom regex rule.
`javascript
const { addRegexRuleName } = require('eslint-plugin-regex')
addRegexRuleName('invalid-custom-890')
module.exports = {
plugins: [ 'regex' ],
rules: {
'regex/invalid-custom-890': [
'error', [
{
regex: 'invalidRegexBN',
files: {
ignore: 'ignoreFilesRegexCN'
}
}
]
]
}
}
`
Custom Regex rules package
Create a custom ESLint package and add the custom regex rules with a "unique" name for each regex rule defined in the package, so it can be use with other package of regex rules or local regex rules.
Custom package index.js:
`javascript
const { addRegexRuleName } = require('eslint-plugin-regex')
addRegexRuleName('invalid-custom-890')
module.exports = {
configs: {
'someRegexRule1': {
plugins: [ 'regex' ],
rules: {
'regex/invalid-custom-890': [
'error', [
{
regex: 'invalidRegexBN',
files: {
ignore: 'ignoreFilesRegexCN'
}
}
]
]
}
}
}
}
`
* This custom package defines 1 rule named regex/invalid-custom-890 with only 1 invalid pattern with error as a default error level.
> An online example can be checked at eslint-plugin-base-style-config.
> For more information on how to create a custom ESLint package check ESLint official documentation: Working with Plugins
then use it,
Some project .eslintrc.json:
`json`
{ "extends": [ "plugin:the-eslint-plugin/someRegexRule1",
to change the default error level set by the package:
`json
{
"extends": [ "plugin:the-eslint-plugin/someRegexRule1" ],
"rules": {
"regex/invalid-custom-890": "warn"
`
mixing with other regex rules:
`json`
{
"extends": [ "plugin:the-eslint-plugin/someRegexRule1" ],
"rules": {
"regex/invalid-custom-890": "warn",
"regex/required": [
"error",
[
"requiredRegex1",
"requiredRegexN"
]
],
"regex/invalid-error": [
"error", [
"invalidRegexA1",
"invalidRegexA2",
{
"regex": "invalidRegexA3",
"message": "errorMessage1",
"files": {
"inspect": "inspectFilesRegexA1"
}
},
{
"id": "regexIdN",
"regex": "invalidRegexN",
"files": {
"ignore": "ignoreFilesRegexAN"
}
}
],
],
Advantages
* Using Named Regex rule name will allow to have a set of different regex rule:
* Each rule with totally different settings.
* Allow to mix different regular expressions.
* Allow to mix different error levels.
* etc.
* Easily create custom regex rules package.
* When using Named Regex Rules, shown errors will be even more specific, e.g.:
`javascript
const { addRegexRuleName } = require('eslint-plugin-regex')
addRegexRuleName('required-custom-896')
`
then, if an error happens, the output will be something similar to:
`sh`
/path/to/some.js
1:1 error Required regular expression /requiredRegex/gm not found in file regex/required-custom-896
instead of
`sh`
/path/to/some.js
1:1 error Required regular expression /requiredRegex/gm not found in file regex/required
###### Import/Export approach
Create a custom npm package using either with json or js files and add the custom regex rules.
Custom package index.js:
with complete rule definition:
`javascript`
module.exports = {
regex: 'invalidRegexBN',
files: {
ignore: 'ignoreFilesRegexCN'
}
}
or
`javascript`
module.exports = {
regex: 'invalidRegexBN',
}
or with only regex definition:
`javascript`
module.exports = 'invalidRegexBN'
or with multiple complete rule definition:
`javascript`
module.exports = {
ruleName1: {
regex: 'invalidRegex1',
files: {
ignore: 'ignoreFilesRegex1'
}
},
ruleNameN: {
regex: 'invalidRegexN',
files: {
ignore: 'ignoreFilesRegexN'
}
}
}
or
`javascript`
module.exports = {
ruleName1: {
regex: 'invalidRegex1',
},
ruleNameN: {
regex: 'invalidRegexN',
}
}
or with multiple only regex definition:
`javascript`
module.exports = {
ruleName1: 'invalidRegex1',
ruleNameN: 'invalidRegexN'
}
or using json files:
`json`
{
"regex": "invalidRegexBN",
"files": {
"ignore": "ignoreFilesRegexCN"
}
}
or
`json`
{
"regex": "invalidRegexBN",
}
or
`json`
{
"ruleName1": {
"regex": "invalidRegex1",
"files": {
"ignore": "ignoreFilesRegex1"
}
},
"ruleNameN": {
"regex": "invalidRegexN",
"files": {
"ignore": "ignoreFilesRegexN"
}
}
}
or
`json`
{
"ruleName1": {
"regex": "invalidRegex1",
},
"ruleNameN": {
"regex": "invalidRegexN",
}
}
or
`json`
{
"ruleName1": "invalidRegex1",
"ruleNameN": "invalidRegexN"
}
> Different approaches can be defined, these are only a glance.
> For more information on how to create a custom npm package check Contributing packages to the registry
Then use the custom package:
Some project .eslintrc.js:
`javascript
import * as SomeESLintSetOfRegexRulesPackage1 from 'the-custom-package1'
import * as SomeESLintSetOfRegexRulesPackage2 from 'the-custom-package2'
module.exports = {
plugins: ["regex"],
rules: {
"regex/invalid": [
'error', [
SomeESLintSetOfRegexRulesPackage1.ruleName1,
SomeESLintSetOfRegexRulesPackage1.ruleNameN,
SomeESLintSetOfRegexRulesPackage2.ruleName1,
SomeESLintSetOfRegexRulesPackage2.ruleNameN
]
],
`
or using synonyms to mix error levels:
`javascript
import * as SomeESLintSetOfRegexRulesPackage1 from 'the-custom-package1'
import * as SomeESLintSetOfRegexRulesPackage2 from 'the-custom-package2'
module.exports = {
plugins: ["regex"],
rules: {
'regex/invalid-error': [
'error', [
SomeESLintSetOfRegexRulesPackage1.ruleNameN,
SomeESLintSetOfRegexRulesPackage2.ruleName1
]
],
'regex/invalid-warn': [
'warn', [
SomeESLintSetOfRegexRulesPackage1.ruleName1,
SomeESLintSetOfRegexRulesPackage2.ruleNameN
]
]
`
Both rule were design with binary approach:
regex/invalid: pattern is not present => any presence of the specific* pattern in a file is invalid.
regex/required: pattern is present => only 1 presence of the specific* pattern in a file is required.
Array of patterns represent different logical operation for each rule:
regex/invalid: OR => the presence in a file of any of the patterns defined in the array* is invalid.
regex/required: AND => the presence in file of all of the patterns defined in the array* is required.
Check:
* invalid-regex Basic rule tests
* invalid-regex Detailed rule tests
* required-regex Basic rule tests
* required-regex Detailed rule tests
* The set of Regex Rules of eslint-plugin-base-style-config
__________________
__________________
CHANGELOG.md`: contains the information about changes in each version, chronologically ordered (Keep a Changelog).
* Use it.
* Share it.
* Give it a Star.
* Propose changes or improvements.
* Report bugs.
__________________
* Use code style verification tools => Encourages Best Practices, Efficiency, Readability and Learnability.
* Code Review everything => Encourages Functional suitability, Performance Efficiency and Teamwork.
* If viable, Start testing early => Encourages Reliability and Maintainability.
Don't forget:
* Love what you do.
* Learn everyday.
* Learn yourself.
* Share your knowledge.
* Think different!.
* Learn from the past, dream on the future, live and enjoy the present to the max!.
* Enjoy and Value the Quest (It's where you learn and grow).
At life:
* Let's act, not complain.
* Be flexible.
At work:
* Let's give solutions, not questions.
* Aim to simplicity not intellectualism.