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Grit Pattern

1and {
2  ConvertRequireToImport()
3  ConvertToArrowFunction()
4  or {
5    ClassMethod(params=$params)
6    FunctionDeclaration(params=$params)
7  } where {
8    $params <: contains bubble {
9      or {
10        Identifier(name="$TSFixMe") => $type,
11        TSAnyKeyword() as $any => $type
12        Identifier(typeAnnotation=null => $type)
13      } where {
14        $type = guess(
15          codePrefix="// fix TypeScript type declarations",
16          fallback="any",
17          stop=["function"]
18        )
19      }
20    }
21  }
22}
const
get
=
require
(
'lodash/get'
)
;
function
getDiscountedPrice
(
product
,
discount
,
applyTax
,
)
{
let
discountedPrice
=
product
.
price
*
(
1
-
discount
)
;
if
(
applyTax
)
{
discountedPrice
+=
discountedPrice
*
getTaxRate
(
product
.
category
)
;
}
return
discountedPrice
;
}
function
getTaxRate
(
category
)
{
const
taxRates
=
{
electronics
:
0.15
,
clothing
:
0.1
,
food
:
0.05
,
}
;
return
get
(
taxRates
,
category
,
0
)
;
}

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"We’ve been using Grit for some internal migrations and it’s a huge time saver, completing projects that might have previously stretched across multiple quarters in just a few days.”

Paul Salvatore

Staff Frontend Engineer, Faire


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Time lost to maintenance
Improve developer velocity
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With Grit

Manually

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Integrate with consistency
Access Grit from GitHub, VS Code, and the command line
arrow-functions.grit
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45-
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57-
58-

`function ($params) { $body }` =>

`($params) => { $body }`

where {

$params <: not contains { `this`, `arguments` }

}

Stay in control with custom patterns
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Migrations

Enzyme to React Testing Library

Chai to Jest

JavaScript to TypeScript

Class components to hooks

Apply pre-built migrations automatically

Grit detects dozens of common sources of technical debt and lets you fix them with an automated pull request in a single click.

Semantic Code Search
1
2
3
4
5

Explore your codebase with declarative patterns

Write powerful AST-aware queries to find and fix antipatterns in your codebase.

Integrated Feedback
Detect regressions and automate best practices

Grit runs on every pull request to hold the line on migrations and prevent sliding backwards.

Accelerate your migrations