platform-bible-utils
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    Variable PROJECT_SELECTOR_CUSTOM_DATA_KEYSConst

    PROJECT_SELECTOR_CUSTOM_DATA_KEYS: Readonly<
        {
            language: "language";
            lastUsedAt: "lastUsedAt";
            type: "type";
            typeName: "typeName";
        },
    > = ...

    Well-known keys the ProjectSelector's built-in groupings (language, type, lastUsed) read from ProjectSelectorProject.customData. Reference these constants rather than typing the key strings inline so a rename here surfaces at every callsite.