Begin update to MSW 2.x - #1114
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Collaborative attempt in Amsterdam Bug: T407364
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Aug 28, 2026
Basic preparations for reimplementation of mock service handlers. Related (basically the same work as): #1114 - **ran 'npx msw init public --save'** - **start mock service with no handlers** - old handlers kept for now as reference in `old.default_handlers.js` - commented import line left as a hint for starting with implementations; commented to make linter happy https://phabricator.wikimedia.org/T436358
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This patch starts the migration from the broken 1.x MSW configuration to a 2.x one.
It vendors in a new
public/mockServiceWorker.js.It adjusts our browser mocks to use the new
msw/browser.It creates a new
default_handlersfile to start migrating worker response resolvers to and stops readingfrom the existing, old format handlers.
In the new handlers it moves over just login functionality and leaves the remaining handler migration (including logout) to future work.
Bug: T407364
co-authored-by: Ollie
co-authored-by: Rosalie