Add @theme-ui/color

[allanpope]

Note: Build failing due to Polished not being on whitelist. Have created a pull request here.

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[typescript-bot]

@allanpope Thank you for submitting this PR!

Because this is a new definition, a DefinitelyTyped maintainer will be reviewing this PR in the next few days once the Travis CI build passes.

In the meantime, if the build fails or a merge conflict occurs, I'll let you know. Have a nice day!

[typescript-bot]

@allanpope The Travis CI build failed! Please review the logs for more information.

Once you've pushed the fixes, the build will automatically re-run. Thanks!

[typescript-bot]

👋 Hi there! I’ve run some quick measurements against master and your PR. These metrics should help the humans reviewing this PR gauge whether it might negatively affect compile times or editor responsiveness for users who install these typings.

Let’s review the numbers, shall we?

These typings are for a package that doesn’t yet exist on master, so I don’t have anything to compare against yet! In the future, I’ll be able to compare PRs to theme-ui__color with its source on master.

Comparison details 📊

Batch compilation
Type count	2430
Assignability cache size	128
Language service measurements
Samples taken	33
Identifiers in tests	33
getCompletionsAtPosition
Mean duration (ms)	79.8
Mean CV	28.5%
Worst duration (ms)	104.5
Worst identifier	desaturate
getQuickInfoAtPosition
Mean duration (ms)	76.4
Mean CV	27.7%
Worst duration (ms)	99.3
Worst identifier	grayscale
System information
Node version	v12.14.1
CPU count	2
CPU speed	2.294 GHz
CPU model	Intel(R) Xeon(R) CPU E5-2673 v4 @ 2.30GHz
CPU Architecture	x64
Memory	6.8 GiB
Platform	linux
Release	4.15.0-1066-azure

[hasparus]

Hey @allanpope 👋 The order of parameters is reversed.

From theme-ui/color source.

export const transparentize = (c, n) => t => P.transparentize(n, g(t, c))