fix(webdriverio): handle dynamic function payloads in mock.respond#15096
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fix(webdriverio): handle dynamic function payloads in mock.respond#15096
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commit: |
elaichenkov
reviewed
Feb 27, 2026
| return payload | ||
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| return JSON.stringify(payload) ?? 'null' |
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JSON.stringify can return undefined for unsupported values (functions, symbols, undefined), so the ?? 'null' fallback silently converts those to the string "null". it could be confusing to debug
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Proposed changes
fixes #14926
//: # (Describe the big picture of your changes here to communicate to the maintainers why we should accept this pull request. If it fixes a bug or resolves a feature request, be sure to link to that issue.)
Fixed an issue where mock.respond() would fail when provided with a function payload because it eagerly serialized the function to undefined, creating an invalid response body.
Types of changes
Checklist
Backport Request
//: # (The current
mainbranch is the development branch for WebdriverIO v9. If your change should be released to the current major version of WebdriverIO (v8), please raise another PR with the same changes against thev8branch.)v9and doesn't need to be back-ported#XXXXXFurther comments
The initial issue was caused by JSON.stringify returning undefined for functions. The fix ensures that the function is preserved and executed when the network event occurs, allowing dynamic modification of the response. A regression test case was added to index.test.ts to verify this behavior.
//: # (If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...)
Reviewers: @webdriverio/project-committers