Update constants.ts

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[headstarterbot]

src/constants.ts

Removing unnecessary array brackets can make the code easier to read and understand.
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    findEnclosingContext(
      file: string,
      node: Node,
    )

Using const assertions for string literals can help prevent accidental modification of the string and improve type safety.
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    return filepath.startsWith("/") ? filepath.slice(1) : filepath as const;