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json-report
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Add buildReport and JSON CLI mode
parse-amount
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Add buildReport and JSON mode
Fix parseAmount function
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Add buildReport and JSON CLI mode
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Work only in this repository. Add an exported buildReport(rows) in src/report.js and support `node src/cli.js <input.json> --json`. The JSON mode must print one compact JSON object with keys in this order: count, totalCents, averageCents. count is the row count, totalCents is the exact sum of safe-integer amountCents values, and averageCents is Math.round(totalCents / count), or 0 for an empty array. Reject a non-array input, non-object rows, non-safe-integer amountCents values, and an unsafe total. Preserve the existing default text output when --json is absent. Run the existing tests. Do not install packages or use the network. Finish by briefly stating the files changed and tests run.

22:51
Thought 3 time(s), Viewed 5 file(s), Ran 1 command(s)

Got it — small task, let me read the existing files first to make sure I don't break the default text path.

Thought 1 time(s), Ran 1 command(s)

Existing test is green. Now adding buildReport and wiring --json into the CLI.

Thought 1 time(s), Edited 2 file(s)

Now running the test suite and a quick sanity check of the CLI in both modes.

Thought 1 time(s), Ran 2 command(s)

Done — everything checks out.

Files changed

report.js
 — added exported buildReport(rows) that validates the input (must be an array of plain objects with safe-integer amountCents), throws on a non-array input / non-object row / non-safe-integer amountCents / unsafe running total, and returns { count, totalCents, averageCents } with keys in that order (average is Math.round(total/count), or 0 when empty). Existing summarize is untouched.
cli.js
 — accepts an optional --json flag (in any position). With it, prints one compact JSON.stringify(buildReport(rows)) line; without it, keeps the original summarize text output. Usage is now node src/cli.js <input.json> [--json].

Tests run

node --test — 1/1 passing (existing keeps the default text summary still green).
Manual smoke checks:
node src/cli.js fixture.json → Processed 3 rows; total: 201 cents (text mode preserved)
node src/cli.js fixture.json --json → {"count":3,"totalCents":201,"averageCents":67} (compact, correct key order)
buildReport([]) → {"count":0,"totalCents":0,"averageCents":0}
buildReport({}), buildReport([{amountCents:1.5}]), buildReport([1]), and an overflow case all throw with descriptive messages.
Edited 2 files
+43
-4
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Review
cli.js
+12
-4
report.js
+31
22:52




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