Chris Woolum, a .NET/JavaScript developer, shared his experience using TSLint fixers to facilitate the migration to Ionic 4.0, inspired by a TypeScript session at Ng-Conf. The Ionic 4 Migration tool he developed works similarly to normal TSLint rules, helping users upgrade their projects by automatically correcting most breaking changes, though it has limitations with CSS changes and complex DOM modifications. The tool relies on TSLint and Codelyzer, an Angular-specific implementation, to parse TypeScript's Abstract Syntax Tree and identify changes needed in the code. Woolum encourages others to contribute to the project and improve the tool's capabilities, expressing gratitude to his collaborators Dan Imhoff and Mike Hartington for their assistance.