I've written a page in the Drug Discovery Resources on covalent inhibitors.

This publication suggests this area is going to become more important "An activity-guided map of electrophile-cysteine interactions in primary human immune cells" https://www.biorxiv.org/content/10.1101/808113v1.

Here, we present a global map of cysteines in primary human T cells that are susceptible to covalent modification by electrophilic small molecules. More than 3000 covalently liganded cysteines were found on functionally and structurally diverse proteins, including many that play fundamental roles in immunology.