feat: type safe colour token parser

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Inspiration

Previously (v2.x.x and below) the library exported different functions to convert colours from different types to a common format like hex.

However, v3 is focused on a more simplified API and therefore all the converter functions have been merged into one utility function token()

How does it work

The function will be broken down into several steps:

• Parsing
• Conversion
• Output modification
• RGB normalization

Parsing

Because we are expecting colors in different types we first have to parse our colour to a widely accepted format. This helps ensure that we don't branch off our logic for no reason.

When an array is passed as a colour token it is converted to a colour object so that it can be passed to functions like formatHex or formatHex8 in the specified srcMode. The same can be said to all the other types which will be converted to plain objects as well.

Conversion

If the targetMode option is specified and the kind is set to 'arr' or 'obj' the colour will be converted to the specified colour space. This is also where we perform normalizeRGB which will allow us to make [0,255] RGB channel ranges compatible with the [0,1] range supported by Culori.

Output modification

This is the stage where we modify the final result to match the options that may be specified for example

• Omitting the alpha channel
• Omitting the colour space mode
• Specifying the output type

This is a core function because it allows the parsing of any recognisable colour tokens throughout the library.

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Default color spaces

When parsing our colors we may want to omit properties like colorspace for example, when working with arrays.

The srcMode is 'rgb' by default and the targetMode is undefined by default as well. In this scenario, the targetMode defaults to the srcMode when 'kind' is 'obj' | 'arr' to avoid errors by passing undefined values to the converter

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#211

Token parser now works as expected

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The other bug I'm facing is that channel values are being normalized like rgb even when the mode is not RGB. Working on it right now