Add Fantom WPT conformance harness - #58267
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Summary: This diff lays down the measurement foundation (a Web Platform Tests harness) for adding streaming fetch support to React Native—without changing any actual product code or streaming functionality yet. Core Strategy: Measurement Before Code Before making deep C++ and JavaScript networking changes across React Native, the engineering team needs an objective, automated scoreboard. Building the test harness first ensures every future change can mechanically prove conformance improvements and catch regressions in continuous integration (CI). The 4-Phase Roadmap Phase 1 (Foundation): Stand up Web Platform Tests (WPT) measurement and introduce the ReadableStream global. (This diff completes the measurement half). Phase 2 (Native Plumbing): Build a C++ path to platform network layers to handle raw data chunks and backpressure. Phase 3 (Bridge & Lifecycle): Connect native network chunks to JS and manage complex teardown/cancellation lifecycle logic. Phase 4 (Standards Polish): Address spec edge cases and long-tail compliance gaps. Differential Revision: D116965389
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Summary:
This diff lays down the measurement foundation (a Web Platform Tests harness) for adding streaming fetch support to React Native—without changing any actual product code or streaming functionality yet.
Core Strategy: Measurement Before Code
Before making deep C++ and JavaScript networking changes across React Native, the engineering team needs an objective, automated scoreboard. Building the test harness first ensures every future change can mechanically prove conformance improvements and catch regressions in continuous integration (CI).
The 4-Phase Roadmap
Phase 1 (Foundation): Stand up Web Platform Tests (WPT) measurement and introduce the ReadableStream global. (This diff completes the measurement half).
Phase 2 (Native Plumbing): Build a C++ path to platform network layers to handle raw data chunks and backpressure.
Phase 3 (Bridge & Lifecycle): Connect native network chunks to JS and manage complex teardown/cancellation lifecycle logic.
Phase 4 (Standards Polish): Address spec edge cases and long-tail compliance gaps.
Differential Revision: D116965389