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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallFor this site, keep its 69-page inventory in one canonical TypeScript array and have other code derive the views it needs. That is a project rule, not a requirement of TypeScript or every web framework. The number 69 is part of the assignment; it has not been independently verified as a live site count.
What “one array” should mean
The rule is most useful when it applies to the project’s page inventory: the authoritative record of which pages exist and their relevant metadata. Put that inventory in one module, then let navigation, page lookup, tests, or other consumers derive their own results from it. Avoid separately hand-maintaining another complete list of the same pages.
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Do not read “nothing else may hold a list” as a ban on every array in the codebase. A navigation group, breadcrumb trail, content collection, query result, or generated route output can be a derived collection rather than a competing inventory. The policy needs to define that boundary; framework documentation does not establish what this site intends by “a list.”
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How to implement the canonical registry
Keep the source in one module
Represent each page as an entry in one exported, typed array. Include only the fields consumers actually need, such as a path and a display label. A consumer should filter, map, or look up entries from this source instead of copying the inventory into a second handwritten array.
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React Router’s framework convention shows route configuration as an array of route objects and uses satisfies RouteConfig to check that the configuration conforms to its route type. Its documentation also describes a file-based route convention, so an explicit array is an available design choice rather than a framework-wide mandate: React Router routes.ts documentation.
Expose a read-only type when consumers should not mutate it
TypeScript’s ReadonlyArray<T> removes mutating methods from the reference’s type and disallows indexed writes at compile time. The TypeScript Handbook describes it as “the same as Array<T> with all mutating methods removed,” allowing you to prevent changes through that reference: TypeScript Handbook: Interfaces.
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This is a compile-time restriction, not a runtime freeze. A type assertion can override it, and the type alone does not guarantee that no other reference can mutate the underlying array. Use it to make accidental mutation harder, not as a security or runtime immutability guarantee.
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If a header needs only pages marked for navigation, filter the canonical array for that view. If a test needs all paths, map the same array to paths. These resulting arrays are fine when they are computed from the registry; the risk is a second manually curated inventory that can drift when pages change.
When one explicit array is—and is not—the right fit
Frameworks locate routes in different places. An explicit registry makes the inventory easy to inspect in one place, but file-based and data-generated routing can be more natural when the framework’s conventions or content model already define pages. The choice concerns where route definitions live and how they are produced; it is not a difference in whether TypeScript permits arrays.
| Approach | Where routes come from | Dynamic pages and timing | Consideration for a single inventory |
|---|---|---|---|
| Explicit typed configuration (React Router) | A route-object array in the route configuration, with type conformance expressible using satisfies RouteConfig. |
Defined by the project’s route configuration; the cited documentation does not establish one universal timing model for all setups. | Centralizes route declarations when the project chooses this convention. React Router also supports file-based routes, so this is not the only documented model. Source. |
| File-based routing (Next.js) | Folders and special page files map to route segments. | Dynamic segments are supported; route structure follows the filesystem convention. | Route definitions are distributed across files rather than held in one project-owned array. Source. |
| File- and data-driven generation (Gatsby) | Page files, data models, and APIs can create routes. | Pages can be created from data; Gatsby documents a duplicate-path warning where the build may still finish and the last-created page is accessible. | Multiple route producers make collisions worth checking. A central inventory may help expose conflicts, but it does not automatically prevent them without implementation details. Source. |
| File-based and generated routes (Astro) | Routes can come from files, with dynamic routes generated from static path data. | Static path data can supply dynamic routes at build time; consult the framework’s routing documentation for the relevant setup. | A single registry is a project-level choice if the filesystem or content data already supplies the route set. Astro v6 routing documentation. |
These approaches are not interchangeable in every application. If the site’s requirement is specifically that all 69 page records live in one TypeScript array, treat that as an architecture constraint and make any framework-generated routes consume or validate against it where practical. If the framework convention itself is the source of routes, calling a separate array canonical can instead create the duplication the policy is meant to avoid.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Checks that make the policy enforceable
- Identify the one module that owns the page inventory and make additions or removals there.
- Search for independent page inventories, not every array. Distinguish hand-maintained copies from computed views and transient results.
- Have navigation and lookup code derive from the canonical entries, rather than maintaining separate lists of page paths.
- Check that every declared path is unique. Gatsby documents that duplicate paths can warn while still building, with the last-created page accessible; a warning is not the same as a guaranteed build failure.
- Use a read-only array type if consumers should not mutate the registry through their typed references, while remembering that TypeScript’s restriction is not a runtime freeze.
What the rule does not prove
No cited framework or TypeScript documentation establishes a measured time saving, performance gain, or error reduction from this exact one-array policy. Centralization can make the intended inventory easier to find and can reduce opportunities for handwritten copies to drift, but it does not by itself guarantee correct routes or prevent conflicts. Those outcomes depend on how the site validates and consumes its entries.
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