Remove false props before generating styles #1
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Prevents generating `undefined` style properties e.g
`{ fontSize: '16px', fontFamily: undefined }`
The above props would generate the following styles:
```
font-size: 16px;
font-family: undefined;
```
The new feature is filtering false props before generating and injecting the styles. The new styles now look something like this:
```
font-size: 16px;
```
More details: styled-components#102
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This PR adds a filter to remove false props to prevent generating
undefinedstyle properties.Example props
{ fontSize: '16px', fontFamily: undefined }The above props would generate the following styles:
The new feature here is filtering false props before generating and injecting the styles.
The new styles now look like this:
Related: styled-components#102