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ESLint-Plugin-Lodash

Maintenance Status NPM version Dependencies Build Status

Lodash-specific linting rules for ESLint.

News

  • Version 2.0.0 was released, and now supports importing single methods! For a list of changes, you can check the changelog. For a detailed rundown of breaking changes and additions, you can check the release notes.

Installation

Install ESLint either locally or globally.

$ npm install eslint --save-dev

If you installed ESLint globally, you have to install the Lodash plugin globally too. Otherwise, install it locally.

$ npm install eslint-plugin-lodash --save-dev

Configuration

Add a plugins section and specify ESLint-Plugin-Lodash as a plugin. You can additionally add settings for the plugin.

Shared Rule Settings

These are settings that can be shared by all of the rules. All settings are under the lodash inside the general settings object. For more info about shared settings, read the ESLint Configuration Guide.

  • pragma: specifies the name you use for the Lodash variable in your code. If none is specified, the plugin checks what was imported in ES6 modules or required in commonjs.
  • version: specifies the major Lodash Version you are using (default is 4). If you wish to use this plugin with Lodash v3, this value should be 3. (on by default in the config v3)

Finally, enable all of the rules that you would like to use.

Recommended configuration

This plugin exports a recommended configuration that enforces all the rules. You can configure the plugin as follows:

{
  "plugins": ["lodash"],
  "extends": ["plugin:lodash/recommended"]
}

Configuration for use with the full Lodash object

If you work with the full Lodash object with the same variable name every time, you should use the canonical configuration. This allows rules to run without explicitly importing Lodash in your code, and allows for faster execution for some of the rules:

{
  "plugins": ["lodash"],
  "extends": ["plugin:lodash/canonical"]
}

Configuration for Using with Lodash v3

Out of the box, this plugin supports the use of Lodash v4. To use with Lodash v3, the config needs to specify the version in the settings, and can't use some rules. The plugin also exports a v3 config for ease of use.

{
  "plugins": ["lodash"],
  "extends": ["plugin:lodash/v3"]
}

List of provided rules

Rules are divided into categories for your convenience. All rules are off by default, unless you use one of the plugin's configurations which turn all relevant rules on.

Possible Errors

The following rules point out areas where you might have made mistakes.

  • callback-binding: Use or avoid thisArg for Lodash method callbacks, depending on major version.
  • collection-method-value: Use value returned from collection methods properly.
  • collection-return: Always return a value in iteratees of Lodash collection methods that aren't forEach.
  • no-double-unwrap: Do not use .value() on chains that have already ended (e.g. with max() or reduce()) (fixable)
  • no-extra-args: Do not use superfluous arguments on Lodash methods with a specified arity.
  • no-unbound-this: Do not use this inside callbacks without binding them.
  • unwrap: Prevent chaining without evaluation via value() or non-chainable methods like max().,

Stylistic Issues

These rules are purely matters of style and are quite subjective.

  • chain-style: Enforce a specific chain style: explicit, implicit, or explicit only when necessary.
  • chaining: Prefer a either a Lodash chain or nested Lodash calls
  • collection-ordering: Enforce a specific collection sorting method: sortBy or orderBy
  • consistent-compose: Enforce a specific function composition direction: flow or flowRight.
  • identity-shorthand: Prefer identity shorthand syntax
  • import-scope: Prefer a specific import scope (e.g. lodash/map vs lodash)
  • matches-prop-shorthand: Prefer matches property shorthand syntax
  • matches-shorthand: Prefer matches shorthand syntax
  • no-commit: Do not use .commit() on chains that should end with .value()
  • path-style: Enforce a specific path style for methods like get and property: array, string, or arrays only for paths with variables. (fixable)
  • prefer-compact: Prefer _.compact over _.filter for only truthy values.
  • prefer-filter: Prefer _.filter over _.forEach with an if statement inside.
  • prefer-find: Prefer _.find over _.filter followed by selecting the first result.
  • prefer-flat-map: Prefer _.flatMap over consecutive map and flatten.
  • prefer-immutable-method: Prefer using methods that do not mutate the source parameters, e.g. _.without instead of _.pull.
  • prefer-invoke-map: Prefer using _.invoke over _.map with a method call inside.
  • prefer-map: Prefer _.map over _.forEach with a push inside.
  • prefer-reject: Prefer _.reject over filter with !(expression) or x.prop1 !== value
  • prefer-thru: Prefer using _.prototype.thru in the chain and not call functions in the initial value, e.g. _(x).thru(f).map(g)...
  • prefer-wrapper-method: Prefer using array and string methods in the chain and not the initial value, e.g. _(str).split(' ')...
  • preferred-alias: Prefer using main method names instead of aliases. (fixable)
  • prop-shorthand: Use/forbid property shorthand syntax.

Preference over native

These rules are also stylistic choices, but they also recommend using Lodash instead of native functions and constructs. For example, Lodash collection methods (e.g. map, forEach) are generally faster than native collection methods.

  • prefer-constant: Prefer _.constant over functions returning literals.
  • prefer-get: Prefer using _.get or _.has over expression chains like a && a.b && a.b.c.
  • prefer-includes: Prefer _.includes over comparing indexOf to -1.
  • prefer-is-nil: Prefer _.isNil over checks for both null and undefined.
  • prefer-lodash-chain: Prefer using Lodash chains (e.g. _.map) over native and mixed chains.
  • prefer-lodash-method: Prefer using Lodash collection methods (e.g. _.map) over native array methods.
  • prefer-lodash-typecheck: Prefer using _.is* methods over typeof and instanceof checks when applicable.
  • prefer-matches: Prefer _.matches over conditions like a.foo === 1 && a.bar === 2 && a.baz === 3.
  • prefer-noop: Prefer _.noop over empty functions.
  • prefer-over-quantifier: Prefer _.overSome and _.overEvery instead of checks with && and || for methods that have a boolean check iteratee.
  • prefer-some: Prefer using _.some over comparing findIndex to -1.
  • prefer-startswith: Prefer _.startsWith over a.indexOf(b) === 0.
  • prefer-times: Prefer _.times over _.map without using the iteratee's arguments.

Contributing

Contributions are always welcome! For more info, read our contribution guide.

License

ESLint-plugin-lodash is licensed under the MIT License.

eslint-plugin-lodash's People

Contributors

alexilyaev avatar arcanemagus avatar avivahl avatar awk34 avatar c0d3d avatar captbaritone avatar danyshaanan avatar david-zacharias avatar dependabot-preview[bot] avatar dependabot[bot] avatar existentialism avatar gajus avatar ganimomer avatar gurpreetatwal avatar jfmengels avatar lavelle-tt avatar lpappone avatar luftywiranda13 avatar lukeapage avatar mariawix avatar mathieumg avatar mbernardeau avatar mischah avatar nicolasbeauvais avatar noahlemen avatar pkaminski avatar spaintrain avatar sudo-suhas avatar tsmmark avatar xotic750 avatar

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eslint-plugin-lodash's Issues

Going to deprecate eslint-plugin-lodash, do you want the name?

We are going to deprecate eslint-plugin-lodash in favor of your module as you have fleshed out more than we have had time to do. Seeing as lodash v4 has been released, would you guys like rights to the eslint-plugin-lodash name on npm? You're already at a higher version in your project than ours so simply releasing yours will take precidence.

If you're interested I'll need to know who I should add as npm owners so you guys will have access to push to it.

prop-shorthand: Add support for nested arrays

let fooArray;

fooArray = [{
    bar: [false],
    num: 1
}, {
    bar: [true],
    num: 2
}];

Method 1:

fooArray = _.filter(fooArray, (foo) => { // warning: Prefer property shorthand syntax
    return foo.bar[0];
});

console.log(fooArray);

Method 2:

fooArray = _.filter(fooArray, ['foo.bar[0]', true]);

console.log(fooArray); // output = [] (empty array)

method1 shows warning message to use prop-shorthand syntax. While using shorthand syntax in method 2 it returns empty array.

lodash3/matches-shorthand listener must be a function

TypeError: Error while loading rule 'lodash3/matches-shorthand': listener must be a function
    at EventEmitter.addListener (events.js:197:11)
    at /Users/gajus/Documents/dev/gajus/create-index/node_modules/pragmatist/node_modules/canonical/node_modules/eslint/lib/eslint.js:699:29
    at Array.forEach (native)
    at /Users/gajus/Documents/dev/gajus/create-index/node_modules/pragmatist/node_modules/canonical/node_modules/eslint/lib/eslint.js:698:39
    at Array.forEach (native)
    at EventEmitter.module.exports.api.verify (/Users/gajus/Documents/dev/gajus/create-index/node_modules/pragmatist/node_modules/canonical/node_modules/eslint/lib/eslint.js:671:16)
    at processText (/Users/gajus/Documents/dev/gajus/create-index/node_modules/pragmatist/node_modules/canonical/node_modules/eslint/lib/cli-engine.js:230:27)
    at CLIEngine.executeOnText (/Users/gajus/Documents/dev/gajus/create-index/node_modules/pragmatist/node_modules/canonical/node_modules/eslint/lib/cli-engine.js:686:26)
    at exports.lintText.lintText (/Users/gajus/Documents/dev/gajus/create-index/node_modules/pragmatist/node_modules/canonical/dist/linters/js/index.js:31:16)
    at exports.default (/Users/gajus/Documents/dev/gajus/create-index/node_modules/pragmatist/node_modules/canonical/dist/lintText.js:46:35)
    at /Users/gajus/Documents/dev/gajus/create-index/node_modules/pragmatist/node_modules/canonical/dist/lintFiles.js:65:45
    at arrayEach (/Users/gajus/Documents/dev/gajus/create-index/node_modules/pragmatist/node_modules/canonical/node_modules/lodash/internal/arrayEach.js:15:9)
    at /Users/gajus/Documents/dev/gajus/create-index/node_modules/pragmatist/node_modules/canonical/node_modules/lodash/internal/createForEach.js:15:9
    at exports.default (/Users/gajus/Documents/dev/gajus/create-index/node_modules/pragmatist/node_modules/canonical/dist/lintFiles.js:53:27)
    at /Users/gajus/Documents/dev/gajus/create-index/node_modules/pragmatist/dist/index.js:242:47

Add prefer-fp

I'm using lodash/fp exclusively. It would be nice if it where possible to force consistent usage of the fp version (and maybe vice versa for the vanilla version).

So these would be warnings:

import _ from "lodash";
import mapValues from "lodash/mapValues";

and these not

import _ from "lodash/fp";
import mapValues from "lodash/fp/mapValues";

Rule proposal: prefer-includes

In my Underscore fork I'm working on a rule prefer-contains that warns if you try to check if the result of _.indexOf is negative. For example:

_.indexOf(collection, item) !== -1

In this case it's better to use _.includes (or in Underscore _.contains):

_.includes(collection, item)

I found about 30 instances of this pattern in our code base, so it may be a common pattern among Lodash users as well.

Does not work with ESLint v2

I am getting an error:

/Users/gajus/Documents/dev/canonical-code-style/canonical/node_modules/eslint-plugin-lodash/lib/rules/matches-shorthand.js:22
        return context.ecmaFeatures.objectLiteralShorthandProperties && astUtil.isEqEqEq(node) &&
                                   ^

TypeError: Cannot read property 'objectLiteralShorthandProperties' of undefined
    at canBeObjectLiteralWithShorthandProperty (/Users/gajus/Documents/dev/canonical-code-style/canonical/node_modules/eslint-plugin-lodash/lib/rules/matches-shorthand.js:22:36)
    at isConjunctionOfEqEqEqToMemberOf (/Users/gajus/Documents/dev/canonical-code-style/canonical/node_modules/eslint-plugin-lodash/lib/rules/matches-shorthand.js:29:35)
    at shouldPreferMatches (/Users/gajus/Documents/dev/canonical-code-style/canonical/node_modules/eslint-plugin-lodash/lib/rules/matches-shorthand.js:48:16)
    at callExpressionReporters.always (/Users/gajus/Documents/dev/canonical-code-style/canonical/node_modules/eslint-plugin-lodash/lib/rules/matches-shorthand.js:57:50)
    at EventEmitter.<anonymous> (/Users/gajus/Documents/dev/canonical-code-style/canonical/node_modules/eslint-plugin-lodash/lib/util/lodashUtil.js:184:13)
    at emitOne (events.js:95:20)
    at EventEmitter.emit (events.js:182:7)
    at NodeEventGenerator.enterNode (/Users/gajus/Documents/dev/canonical-code-style/canonical/node_modules/eslint/lib/util/node-event-generator.js:42:22)
    at CodePathAnalyzer.enterNode (/Users/gajus/Documents/dev/canonical-code-style/canonical/node_modules/eslint/lib/code-path-analysis/code-path-analyzer.js:592:23)
    at CommentEventGenerator.enterNode (/Users/gajus/Documents/dev/canonical-code-style/canonical/node_modules/eslint/lib/util/comment-event-generator.js:98:23)

prefer-lodash-method false positive on slice string

prefer-lodash-method creates a false positive on slicing a string. _.slice does not behave the same as string.slice

If I am incorrect please let me know but I am pretty sure that string.slice is less then _.slice_.toArray(string))

lodash/prefer-noop

When creating a noop in an ES6 class, this rule is triggered:

class foo {
  bar() {} // Prefer _.noop over an empty function
}

I do not know of a way to assign _.noop while maintaining this class syntax.

Thoughts?

lodash/no-extra-args: false positive with angular.module().constant if function is passed and lodash chain is used in it

This snippet

(function () {
  'use strict';

  angular
    .module('whatever', [])
    .constant('foo', foo => _(foo).reduce(bar, []));
})();

reports

  4:3  error  Too many arguments passed to `constant` (expected 0)  lodash/no-extra-args

While those ones:

(function () {
  'use strict';

  angular
    .module('whatever', [])
    // Array#reduce instead of lodash chained reduce
    .constant('foo', foo => foo.reduce(bar, []));
})();
(function () {
  'use strict';

  angular
    .module('whatever', [])
    // _.reduce instead of chain
    .constant('foo', foo => _.reduce(foo, bar, []));
})();
(function () {
  'use strict';

  angular
    .module('whatever', [])
     // explicit _.chain().reduce().value() instead of normal chain
    .constant('foo', foo => _
      .chain(foo)
      .reduce(bar, [])
      .value()
    );
})();

don't do that.

enhancement: add option for matches-prop-shorthand to only warn on literals

the following gets a warning from matches-prop-shorthand

var a = _.filter(b, function(c) {
   return c.d === e;
});

but if e is not a literal or variable containing a literal then switching to the matches prop shorthand will change behaviour (e.g. for an example...)

var e = {};
var b = [{d:{}}];
var a = _.filter(b, function(c) {
   return c.d === e;
});
// a === undefined
var a = _.filter(b, ['d', e]);
// a === b[0]

So.. I'd rather only have this rule on if it is being compared against a literal, to avoid "tricking" a developer not thinking about it into changing the behaviour of the program...

hasOnlyOneStatement is throwing TypeError: Cannot read property 'type' of undefined

Input:

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a)&&a[f]===r)return t||f;return!t&&-1}}},{76:76,78:78,79:79}],8:[function(t,n,r){var e=t(17),o=t(34),i=t(80),u=t(79),c=t(9);n.exports=function(t){var n=1==t,r=2==t,a=3==t,s=4==t,f=6==t,l=5==t||f;return function(h,p,v){for(var g,y,d=i(h),m=o(d),S=e(p,v,3),b=u(m.length),x=0,w=n?c(h,b):r?c(h,0):void 0;b>x;x++)if((l||x in m)&&(g=m[x],y=S(g,x,d),t))if(n)w[x]=y;else if(y)switch(t){case 3:return!0;case 5:return g;case 6:return x;case 2:w.push(g)}else if(s)return!1;return f?-1:a||s?s:w}}},{17:17,34:34,79:79,80:80,9:9}],9:[function(t,n,r){var e=t(38),o=t(36),i=t(83)("species");n.exports=function(t,n){var r;return o(t)&&(r=t.constructor,"function"!=typeof r||r!==Array&&!o(r.prototype)||(r=void 0),e(r)&&(r=r[i],null===r&&(r=void 0))),new(void 0===r?Array:r)(n)}},{36:36,38:38,83:83}],10:[function(t,n,r){var e=t(11),o=t(83)("toStringTag"),i="Arguments"==e(function(){return arguments}());n.exports=function(t){var n,r,u;return void 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Error:

/Users/gajus/Documents/dev/canonical-code-style/canonical/node_modules/eslint-plugin-lodash/lib/util/astUtil.js:114
    return func.type === 'ArrowFunctionExpression' ? !_.get(func, 'body.body') : _.get(func, 'body.body.length') === 1;
               ^

TypeError: Cannot read property 'type' of undefined
    at Object.hasOnlyOneStatement (/Users/gajus/Documents/dev/canonical-code-style/canonical/node_modules/eslint-plugin-lodash/lib/util/astUtil.js:114:16)
    at onlyHasSimplifiableIf (/Users/gajus/Documents/dev/canonical-code-style/canonical/node_modules/eslint-plugin-lodash/lib/rules/prefer-filter.js:30:24)
    at /Users/gajus/Documents/dev/canonical-code-style/canonical/node_modules/eslint-plugin-lodash/lib/rules/prefer-filter.js:35:81
    at EventEmitter.<anonymous> (/Users/gajus/Documents/dev/canonical-code-style/canonical/node_modules/eslint-plugin-lodash/lib/util/lodashUtil.js:184:13)
    at emitOne (events.js:95:20)
    at EventEmitter.emit (events.js:182:7)
    at NodeEventGenerator.enterNode (/Users/gajus/Documents/dev/canonical-code-style/canonical/node_modules/eslint/lib/util/node-event-generator.js:42:22)
    at CodePathAnalyzer.enterNode (/Users/gajus/Documents/dev/canonical-code-style/canonical/node_modules/eslint/lib/code-path-analysis/code-path-analyzer.js:592:23)
    at CommentEventGenerator.enterNode (/Users/gajus/Documents/dev/canonical-code-style/canonical/node_modules/eslint/lib/util/comment-event-generator.js:98:23)
    at Controller.controller.traverse.enter (/Users/gajus/Documents/dev/canonical-code-style/canonical/node_modules/eslint/lib/eslint.js:824:36)

no-extra-args error on _.attempt

Hi,

Here is another issue,

This sample code from _.attempt lodash docs:
var elements = _.attempt(function(selector) { return document.querySelectorAll(selector); }, '>_>');

Reports:

Too many arguments passed to attempt (expected 1) (lodash/no-extra-args)

Again seems to be a problem with analyzing an argument of type (…*)

Ideas for rules

FYI: I submitted some rule ideas to eslint-plugins/eslint-plugin-lodash#3.

Here are these that are (in my understanding) not covered by your plugin:

  • detect stupid callbacks (for all functions that support 3 kinds of callbacks - map, filter, find, ... and many many more)

    _.filter(stuff, function(obj) { return obj.field === 'foo'; }) --> _.filter(stuff, {field: 'foo'})

  • detect stupid usages of _.find inside loops (with loops, I mean each, map, filter and so on)

    In most cases it's better to use _.indexBy to create an index and then query stuff using that index, thus reducing complexity from O(n²) to O(n • log n).

  • detect conditions like obj.a === 'foo' && obj.b === 'bar' && obj.c === 'baz' and suggest to replace them by _.matches(obj, {a: 'foo', b: 'bar', c: 'baz'})

  • detect for (var i=0; i>c.length; i++) and suggest to use _.each or _.map instead (maybe only when the only usage of i is reading/writing c[i])

  • detect usages of _.each or _.filter when _.find would be simpler

  • detect usages of _.each or _.filter when _.every or _.any would be simpler

  • or maybe even detect the above patterns not only for _.each, but also for plain JS loops!

  • detect usage of aliases, and suggest to use the aliased function instead (example: _.extend --> _.assign)

  • detect chains like a && a.b && a.b.c && a.b.c.d and suggest to replace them with _.get, _.set or _.has

  • _.isArray(x) && _.isObject(x) is equivalent to _.isArray(x). There also more possible similar rules.

Btw, I think it would be great to somehow merge this project and https://github.com/eslint-plugins/eslint-plugin-lodash, they do the same thing.

flatMap not detected as part of a lodash chain

this

_.chain(a).flatMap('b').map('c').value()

is hitting prefer-lodash-method because flatMap isn't marked chainable.

But am also confused by the lodash documentation - I raised this..
lodash/lodash#2166
because it looks like everything is chainable.. so am not sure whether everything should be chainable or just to add flatMap to the chainable list..

lodash/path-style

Do not require string for single level depths when path is variable

Example:

var field="aaa";
_.get(obj,[field])

Find Lodash imports other than `_`

In this function you explicitly check for the name _ to identify a lodash call. I try not to import lodash as _ since I also use _ for unused variables (many other languages to that as well).

Is it possible to extend this method to detect other names for lodash?

Preparations for eslint-plugin-lodash version 1.0.0

Administration

  • Create and maintain CHANGELOG.md (issue #14) (9310bd4)
  • Update README.md: (2dd1eda)
    • Add example config for v3 and v4
    • Divide rules into sections (correctness, style, preference over native)
    • Fix coverage: unknown badge
  • add CONTRIBUTING.md (0acfdc8)

Migration to lodash4

  • Use shared settings to determine major version (default 4) (33f37ab)
  • Update rules to be dependant on major version (6f3e204)
  • Change no-unnecessary-bind to callback-binding dependant on major version (a107ad5)
  • new rule: prefer-is-nil: prefer _.isNil(x) over x === undefined || x === null and x !== undefined && x !== null; (ee23d5b)
  • new rule: prefer-over-quantifier: prefer _.overEvery, _.overSome over _.filter with && or || and over _(x).filter(f).filter(g) (b9aa62d)
  • new rule: prefer-flat-map: prefer _.flatMap over consecutive map and flatten. (8c0dfcb)

Other changes:

  • Make matches-shorthand only work on multiple properties (so it doesn't collide with matches-prop-shorthand) (30fde0e)
  • Add option for using other expression as '_' (e4dc506)
  • Improve rule performance (6a2015f, 9abe03e, 9bca10c)

feature suggestion: must use value

so we require explicit chains, but I don't like the look of..

_.chain(a)
    .map('a')
    .forEach((a) => {})
    .value();

I think the code would be clearer and more likely correct if any chains ending in value() are assigned to something, so the above code would have to be

var description = _.chain(a)
    .map('a')
    .value();
_.forEach(description, (a) => {})

and it would prevent chains not being assigned (e.g. useless code)

wdyt?

btw sorry I know I haven't submitted a pr for my last feature but still slowly switching on your rules on our large codebase...

[feat] prefer-reject

I suppose it is correct to prefer reject in this code or similar

_.filter(obj,_.negate(exp))

Preferred:

_.reject(obj, exp)

prefer-times throws if destructuring inside a _.map

node_modules/eslint-plugin-lodash/lib/rules/prefer-times.js:16
        return paramNode.name || paramNode.left.name;
                                               ^

TypeError: Cannot read property 'name' of undefined

On code like _(foo).map({label, id}, index) => return label

Rule idea: Valid lodash method

I'm currently migrating from lodash 3 to lodash 4. I looked into this plugin to help me identify the parts of my code where I'm using lodash methods that no longer exist (e.g. pluck). Unfortunately with all checks turned on I get the following eslint errors:

/.../test/cluster.test.js
  46:9  error  Prefer _.startsWith instead of comparing indexOf() to 0  lodash/prefer-startswith

But the tests fail with:

  1) cluster interactions logs worker exits:
     TypeError: _.pluck is not a function
      at Context.<anonymous> (test/cluster.test.js:36:23)

Would it be worthwhile to add a rule that fails when you use an unknown lodash method? Or am I missing an existing one?

prefer-get false positive

For the following code snippet (where _mailing is a variable on the module scope):

  if (_mailing && _mailing.autosave && _mailing.autosave.modified) {
    return LocaleStore.formatMessage('autosave.navigatewarning')
  }

I get the following error:

xxx/xxx.es6
33:11  error  Prefer _.get or _.has over an '&&' chain  lodash/prefer-get

callback-binding error on _.zipWith

Hi,

Thanks for this plugin, we want to use it but encountered several issues as the following,

This sample code from _.zipWith lodash docs:

_.zipWith([1, 2], [10, 20], [100, 200], function(a, b, c) {
  return a + b + c;
});

Reports an error:

Do not use Lodash 3 thisArg, use binding instead (lodash/callback-binding)

Seems to be a problem with analyzing the (…Array) argument

jQuery-like find mistook for native find

$(movieElement)
    .parents('h3')
    .siblings('.show_results')
    .find('.film_time_listing span a')

This is a cheerio object iteration.

║ 32       │ 57       │ warning  │ Prefer '_.find' over the native function               │ lodash3/prefer-      ║
║          │          │          │                                                        │ lodash-method        ║
║ 34       │ 36       │ warning  │ Prefer '_.find' over the native function               │ lodash3/prefer-      ║
║          │          │          │                                                        │ lodash-method        ║
║ 35       │ 32       │ warning  │ Prefer '_.find' over the native function               │ lodash3/prefer-      ║
║          │          │          │                                                        │ lodash-method        ║
║ 36       │ 33       │ warning  │ Prefer '_.find' over the native function               │ lodash3/prefer-      ║
║          │          │          │                                                        │ lodash-method        ║
║ 46       │ 36       │ warning  │ Prefer '_.find' over the native function               │ lodash3/prefer-      ║
║          │          │          │                                                        │ lodash-method        ║

It results in the following errors.

Support Lodash and lodash/fp at the same time with _.noConflict

I use lodash and lodash/fp at the same time with the use of _.noConflict. Thus I have lodash bound to _ and lodash/fp bound on fp.

<script src='path/to/lodash.js'></script>
<script src='path/to/lodash.fp.js'></script>
<script>
// lodash is already on _
var fp = _.noConflict();
_.map(['6', '8', '10'], parseInt); // use standard lodash on _
fp.map(parseInt)(['6', '8', '10']); // this will give error
</script>

Now prefer-lodash-method will mark fp.map as error. Which is wrong.

There is the pragma setting with it I could set lodash to be on fp but then it is no longer on _. One possible solution would be to accept an array for pragma where I could define:

pragma: ['_', 'fp']

Or how should both be used together?

BTW: We do have lots of code in lodash already but want to use lodash/fp for the newer code. So it has to be used together.

[lodash/path-style] false positive with _.matchesProperty

{
  "rules": {
    "lodash/path-style": ["error", "string"],
  }
}
const order = {id: 42};
const belongsToOrder = _.matchesProperty(['order_id', order.id]);

It triggers the error from lodash/path-style:

screen shot 2016-04-19 at 12 59 04

I think this is not the case where this rule should err.
This syntax means "create a function that will return true if the object it takes has a value given as the 2nd element of the tuple on property path given as the first element of the tuple"

So this:

const matches = _.matchesProperty([['foo', 'bar'], value]);

should violate the rule with the config given. And this:

const matches = _.matchesProperty(['foo.bar', value]);

should be lint-free.

prefer-includes misses a few cases

I'll include some examples from our code base:

if (!str || _.indexOf(str, "_") < 0) {

if (_.indexOf(self.unmatchedColumns, idx) > -1) {

if (_.indexOf(recommendedNetworks, network.get('network')) >= 0) {

There are theoretically lots of other ways this could be written, but I'm sure there is a point of diminishing returns. Here is the rough draft I came up with which tries to be very clever about finding all kinds of edge cases:

captbaritone/eslint-plugin-underscore@c2059a8

It's pretty gross and I don't like it at all, which is why I still haven't merged it. I'm guessing something less "clever" (like your solution) but that catches the above three cases would be a nice middle-ground.

False positive for chainable on minBy

I am getting a false positive for chainable

I am starting with an array like this:

let test = [
    {
        "name": "a",
        "age": 18
    },
    {
        "name": "b",
        "age": 21
    },
    {
        "name": "a",
        "age": 55
    }
];

I want to convert this to the min age for each name
Correct end result is

[{"name": "a", "age": 18},{"name": "b", "age": 21}]

I am trying this:

testResult = _(test)
    .groupBy("name") // {"a": [{"name": "a", "age": 18}, {"name": "a", "age": 55}], "b": [{"name": "b", "age": 21}]}
    .map((sameName) => _.minBy(sameName, "age")) // [{"name": "a", "age": 18}, {"name": "b", "age": 21}]
    .value();

OR

let groupedNames = _.groupBy(test, "name");
testResult = _.map(groupedNames, (sameName) => _.minBy(sameName, "age"));

I am not sure why I get an error on both of these of "refer lodash chain (lodash/prefer-lodash-chain)"
This seems to be incorrect as minBy is not chainable

Perhaps there is a better way though?

prefer-lodash-typecheck does not catch typeof configuration[name] === 'undefined'

should suggest to use https://lodash.com/docs#isUndefined

The specific subject where it did not suggest to replace it with _.isUndefined:

import _ from 'lodash';

/**
 * @typedef CSSModules~Options
 * @see {@link https://github.com/gajus/react-css-modules#options}
 * @property {boolean} allowMultiple
 * @property {boolean} errorWhenNotFound
 */

/**
 * @param {CSSModules~Options} userConfiguration
 * @return {CSSModules~Options}
 */
export default (userConfiguration = {}) => {
    let configuration;

    configuration = {
        allowMultiple: false,
        errorWhenNotFound: true
    };

    _.forEach(userConfiguration, (value, name) => {
        if (typeof configuration[name] === 'undefined') {
            throw new Error('Unknown configuration property "' + name + '".');
        }

        if (typeof value !== 'boolean') {
            throw new Error('"' + name + '" property value must be a boolean.');
        }

        configuration[name] = value;
    });

    return configuration;
};

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