Function getBase64ImageHeader

getBase64ImageHeader(str): "data:image/gif;base64," | "data:image/jpeg;base64," | "data:image/jpg;base64," | "data:image/png;base64," | "data:image/svg+xml;base64," | "data:image/webp;base64,"
get the header of a base64 image
Parameters
- str: `data:image/gif;base64,${string}` | `data:image/jpeg;base64,${string}` | `data:image/jpg;base64,${string}` | `data:image/png;base64,${string}` | `data:image/svg+xml;base64,${string}` | `data:image/webp;base64,${string}`
Returns "data:image/gif;base64," | "data:image/jpeg;base64," | "data:image/jpg;base64," | "data:image/png;base64," | "data:image/svg+xml;base64," | "data:image/webp;base64,"
Example
```
const img_uri = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAD..."
const img_header = getBase64ImageHeader(img_uri) // == "data:image/png;base64,"
```
- Defined in work/kitchensink_ts/kitchensink_ts/src/image.ts:44