Automatic codemods to upgrade your styled-components code to newer versions.
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README.md

styled-components-codemods

Automatic codemods to upgrade your styled-components code to newer versions.

Installation

Thanks to npx no installation is needed, just run the command below!

Usage

Usage: npx styled-components-codemods [options] [command]

Options:

  -V, --version                                  output the version number
  -h, --help                                     output usage information

Commands:

  v4 [...files]                                  Run all v4 codemods
  v4-extendToStyled [...files]                   Run just the extendToStyled codemod
  v4-injectGlobalToCreateGlobalStyle [...files]  Run just the injectGlobalToCreateGlobalStyle codemod

Examples:

  $ styled-components-codemods v4-extendToStyled src/components/Box.js src/components/Button.js
  $ styled-components-codemods v4 src/**/*.js (this will only work if your terminal expands globs)

Codemods

v4

In version 4 of styled-components the Component.extends API will be removed in favor of only using styled(Component). This codemod replaces all .extends calls to equivalent styled() calls instead. Furthermore, the injectGlobal API has been upgraded to slot into React's lifecycle more naturally. It refactors all injectGlobal calls, and warns you where they are, so you can export them and include them when rendering.

Limitations

There is no way to distinguish whether .extend identifier is related to styled-components or any other library/prototype etc. If you know that there is another .extend function in your project that is not related to styled-components be aware and revert these instances manually.

Be aware that .extend used in combination with .withComponent can give you a different result than styled(WithComponentedComponent). Refer to this issue to understand the difference.

Example
Code Before
StyledComponent.extend``;

StyledComponent.extend`
  color: red;
`;

StyledComponent.extend({ color: "red" });

StyledComponent.extend;

StyledComponent.extend``.extend;

StyledComponent.extend({ color: red }).extend;

styled.div``.extend``;

styled.div`
  color: red;
`.extend`color: blue;`;

styled.div({ color: "red" }).extend({ color: "blue" });

StyledComponent.withComponent("div").extend``;

StyledComponent.withComponent("div").extend`color: red;`;

StyledComponent.withComponent("div").extend();

StyledComponent.withComponent("div").extend({ color: red });

StyledComponent.extend()
  .extend()
  .extend().extend``;

StyledComponent.extend``.extend().extend``.extend``;
Code after
import styled, { css } from "styled-components";

styled(StyledComponent)``;

styled(StyledComponent)`
  color: red;
`;

styled(StyledComponent)({ color: "red" });

styled(StyledComponent);

styled(styled(StyledComponent)``);

styled(styled(StyledComponent)({ color: red }));

styled(styled.div``)``;

styled(
  styled.div`
    color: red;
  `
)`
  color: blue;
`;

styled(styled.div({ color: "red" }))({ color: "blue" });

styled(StyledComponent.withComponent("div"))``;

styled(StyledComponent.withComponent("div"))`
  color: red;
`;

styled(StyledComponent.withComponent("div"))();

styled(StyledComponent.withComponent("div"))({ color: red });

styled(styled(styled(styled(StyledComponent)())())())``;

styled(styled(styled(styled(StyledComponent)``)())``)``;