RNW supports WinAppSDK – Phase 1 “Experimental”

[AgneLukoseviciute]

Building on top of #9599, this issue tracks the set of sub-issues that are required before RNW support for WinAppSDK is said to be in Experimental.

Overall, the goal here is to demonstrate that mixing WinAppSDK and RNW in C++ is possible. But without the general tool chain you might expect (CLI project creation, modules, and such). This enables customers who are willing to "brute force" past those sorts of gaps to get started.

Phase 0 | Phase 1 | Phase 2 | Phase 3 | Phase 4

Estimated Schedule

gantt
    section WinAppSDK
    Phase 0 "Prototype" :done, phase0, 2022-01-01, 2022-03-21
    Phase 1 "Experimental" :active, phase1, 2022-03-28, 53d
    9143 : phase1a, 2022-03-28, 9d
    8132 pt.1 : phase1b, after phase1a, 12d
    8166 : phase1c, after phase1b, 17d
    8132 pt.2 : phase1d, after phase1c, 15d
    Phase 2 "Preview": phase2, after phase1, 22d
    Phase 3 "Stable"  : phase3, after phase2, 40d
    Phase 4 "Default"  : phase4, after phase3, 26d

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Phase 1 "Experimental"

• Release builds of Reunion apps should bundle #8116
• Support for C++ WinAppSDK apps (CLI template) #8132
• Create sample C++ app for winappsdk #9143

[jonthysell]

@AgneLukoseviciute If the individual items for this won't be ready for 0.69, go ahead and move the milestone to 0.70.