Cozy codeshifts

A collection of utils and transforms for jscodeshift.

Codeshifts are automatic transformations of Javascript code. They can be used for

• code migrations following API changes
• flag removal
• general automatic code changes...

See here for more information on codeshifts.

General usage

$ jscodeshift -t node_modules/cozy-codeshifts/dist/<TRANSFORM> --parser babel --js,jsx -- src

Available transforms

Apply flag

Transforms flag() calls into true then remove dead code and dead imports

Before

import Old from 'old'
import New from 'new'
flag("hello") ? <Old /> : <New />

After

import New from 'new'
<New />

Remove boolean variables

Simpler version of Apply flag only for boolean variables.

Before

import Old from 'old'
import New from 'new'
true ? <Old /> : <New />

After

<New />

API

Functions

removeUnusedImports(root, j)

Removes unused imports by counting usage. JSX identifiers are counted as React usage.

Kind: global function

| Param | Type | | --- | --- | | root | PathNode | | j | Object |

isBlockLike(path) ⇒ Boolean

Returns true if path is Program or a Block

Kind: global function

| Param | Type | | --- | --- | | path | PathNode |

flatReplace(path, newNode)

Replaces path.node with newNode without keeping blocks, flattening newNode into path. Useful when removing if/else.

Kind: global function

| Param | Type | | --- | --- | | path | PathNode | | newNode | Node |

simplifyConditions(root, j)

Statically evaluates boolean conditions

Kind: global function

| Param | Type | | --- | --- | | root | NodePath | | j | Object |

Example

`if (true) { foo } else { bar }` -> `foo`

`true ? foo : bar` -> `foo`

`!true ? foo : bar` -> `bar`