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refactor: model bin errors as neverthrow Result values (task 0003)

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Split the view command out of the entry point and make its failure a
value rather than an exception. index.ts is now scaffolding plus
dispatch; view.ts owns the behaviour, returning Result<string, ViewError>
(a plain-data tagged union) via neverthrow, with try/catch confined to a
readFile adapter. The entry point matches the Result at the boundary.

Because viewFile is a pure in-process function it is now unit-tested
directly (and counted by coverage), while the subprocess tests stay as
the end-to-end check. ADR 0008 records the errors-as-values convention.
This commit is contained in:
alexion
2026-07-28 21:21:23 -04:00
parent 313a5b60b7
commit ae542893da
7 changed files with 120 additions and 12 deletions
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8
bun.nix
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@@ -55,6 +55,10 @@
url = "https://registry.npmjs.org/@nodable/entities/-/entities-3.0.0.tgz";
hash = "sha512-8L9xFeTYKhm49xfIypoe2W5wV1m/3Z58kT+7kR9A8OyFxcPduI4VmxaUMQyKYrRjUoLLSXv6EKKID5Tvj9cUVw==";
};
"@rollup/rollup-linux-x64-gnu@4.62.3" = fetchurl {
url = "https://registry.npmjs.org/@rollup/rollup-linux-x64-gnu/-/rollup-linux-x64-gnu-4.62.3.tgz";
hash = "sha512-V4KtWtQfAFMU7+9/A/VDps/VI8CHd3cYz0L8sgJzz8qK7eY7wI4ruFD82UYIYvW9Z4DtlTfhQcsl4XyPHW5uSg==";
};
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@@ -271,6 +275,10 @@
url = "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz";
hash = "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==";
};
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hash = "sha512-kOCT/1MCPAxY5iUV3wytNFUMUolzuwd/VF/1KCx7kf6CutrOsTie+84zTGTpgQycjvfLdBBdvBvFLqFD2c0wkQ==";
};
"path-expression-matcher@1.6.2" = fetchurl {
url = "https://registry.npmjs.org/path-expression-matcher/-/path-expression-matcher-1.6.2.tgz";
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