Type completeness workflow

.github/scripts/append_verifytypes_step_summary.sh

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+#!/usr/bin/env bash
+# Appends a pyright --verifytypes text report to $GITHUB_STEP_SUMMARY,
+# wrapped in a collapsible <details> block. GitHub caps each step's summary
+# at 1MiB and silently drops the whole upload if exceeded, so the report is
+# truncated to a safe byte budget with a note when that happens, rather than
+# risking the entire block vanishing.
+set -euo pipefail
+
+report_file="$1"
+label="$2"
+max_bytes=900000
+
+total_bytes="$(wc -c < "$report_file")"
+
+{
+  echo "<details><summary>Full pyright --verifytypes output (${label})</summary>"
+  echo ""
+  echo '```text'
+  head -c "$max_bytes" "$report_file"
+  if [ "$total_bytes" -gt "$max_bytes" ]; then
+    echo ""
+    echo "... (truncated: ${total_bytes} bytes total, GITHUB_STEP_SUMMARY caps each step at 1MiB)"
+  fi
+  echo '```'
+  echo "</details>"
+} >> "$GITHUB_STEP_SUMMARY"

.github/scripts/pyright_typecompleteness_summary.py

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+"""
+Builds a Markdown summary comparing pyright `--verifytypes` reports for a
+PR's base and head commits, for posting as a PR comment.
+
+"Project" completeness is read directly from the head report's
+typeCompleteness.completenessScore. "Patch" completeness is computed by
+matching exported symbols between the base and head reports by their
+dotted name: a symbol counts toward the patch if it is new in head, or if
+its known/ambiguous/unknown status changed between base and head. This
+avoids needing to map symbols to source line ranges, since pyright only
+reports a file/line for symbols that already have a type problem.
+"""
+from __future__ import annotations
+
+import argparse
+import json
+from pathlib import Path
+from typing import Any
+
+STATUS_ICON = {"known": "✅", "ambiguous": "⚠️", "unknown": "❌"}
+
+
+def status_of(symbol: dict[str, Any]) -> str:
+    if symbol["isTypeKnown"]:
+        return "known"
+    if symbol["isTypeAmbiguous"]:
+        return "ambiguous"
+    return "unknown"
+
+
+def load_type_completeness(report_path: Path) -> dict[str, Any]:
+    with report_path.open() as f:
+        data = json.load(f)
+    return data["typeCompleteness"]
+
+
+def exported_symbols(type_completeness: dict[str, Any]) -> dict[str, dict[str, Any]]:
+    return {s["name"]: s for s in type_completeness["symbols"] if s["isExported"]}
+
+
+def other_symbol_counts(type_completeness: dict[str, Any]) -> dict[str, int]:
+    other = type_completeness["otherSymbolCounts"]
+    return {
+        "known": other["withKnownType"],
+        "ambiguous": other["withAmbiguousType"],
+        "unknown": other["withUnknownType"],
+    }
+
+
+def counts_by_status(symbols: list[dict[str, Any]]) -> dict[str, int]:
+    counts = {"known": 0, "ambiguous": 0, "unknown": 0}
+    for s in symbols:
+        counts[status_of(s)] += 1
+    return counts
+
+
+def completeness_pct(counts: dict[str, int]) -> float:
+    total = sum(counts.values())
+    return 100.0 * counts["known"] / total if total else 0.0
+
+
+def render_counts_table(rows: list[tuple[str, dict[str, int]]]) -> str:
+    lines = ["| | Known | Ambiguous | Unknown | Total |", "|---|---|---|---|---|"]
+    for label, counts in rows:
+        total = sum(counts.values())
+        lines.append(
+            f"| {label} | {counts['known']} | {counts['ambiguous']} | "
+            f"{counts['unknown']} | {total} |"
+        )
+    return "\n".join(lines)
+
+
+def render_patch_detail(
+    patch_names: list[str],
+    base: dict[str, dict[str, Any]],
+    head: dict[str, dict[str, Any]],
+) -> str:
+    lines = ["| Symbol | Status | Change |", "|---|---|---|"]
+    for name in sorted(patch_names):
+        head_status = status_of(head[name])
+        icon = STATUS_ICON[head_status]
+        if name not in base:
+            change = "new"
+        else:
+            base_status = status_of(base[name])
+            change = f"changed (was {STATUS_ICON[base_status]} {base_status})"
+        lines.append(f"| `{name}` | {icon} {head_status} | {change} |")
+    return "\n".join(lines)
+
+
+def build_summary(base_path: Path, head_path: Path) -> str:
+    base_tc = load_type_completeness(base_path)
+    head_tc = load_type_completeness(head_path)
+    base = exported_symbols(base_tc)
+    head = exported_symbols(head_tc)
+
+    project_counts = counts_by_status(list(head.values()))
+    project_pct = completeness_pct(project_counts)
+    other_counts = other_symbol_counts(head_tc)
+
+    patch_names = [
+        name
+        for name, symbol in head.items()
+        if name not in base or status_of(base[name]) != status_of(symbol)
+    ]
+
+    sections = [
+        "## Pyright Type Completeness",
+        "",
+        f"**Project (full `chainladder` package, at this PR's head):** "
+        f"{project_pct:.1f}% of exported symbols fully typed "
+        f"({project_counts['known']} / {sum(project_counts.values())})",
+        "",
+        render_counts_table([("Project (head)", project_counts)]),
+        "",
+        f"Other symbols referenced but not exported by `chainladder`: "
+        f"{sum(other_counts.values())}",
+        "",
+        render_counts_table([("Other (head)", other_counts)]),
+        "",
+        "Symbols without documentation:",
+        f"- Functions without docstring: {head_tc['missingFunctionDocStringCount']}",
+        f"- Functions without default param: {head_tc['missingDefaultParamCount']}",
+        f"- Classes without docstring: {head_tc['missingClassDocStringCount']}",
+        "",
+    ]
+
+    if patch_names:
+        patch_counts = counts_by_status([head[n] for n in patch_names])
+        patch_pct = completeness_pct(patch_counts)
+        sections += [
+            f"**Patch (exported symbols added or changed by this PR):** "
+            f"{patch_pct:.1f}% fully typed "
+            f"({patch_counts['known']} / {sum(patch_counts.values())})",
+            "",
+            render_counts_table([("Patch", patch_counts)]),
+            "",
+            "<details>",
+            "<summary>Patch symbol details</summary>",
+            "",
+            render_patch_detail(patch_names, base, head),
+            "",
+            "</details>",
+        ]
+    else:
+        sections += [
+            "**Patch (exported symbols added or changed by this PR):** "
+            "no exported symbol type-completeness changes detected.",
+        ]
+
+    return "\n".join(sections)
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--base", required=True, type=Path)
+    parser.add_argument("--head", required=True, type=Path)
+    parser.add_argument("--output", required=True, type=Path)
+    args = parser.parse_args()
+
+    summary = build_summary(args.base, args.head)
+    args.output.write_text(summary)
+    print(summary)
+
+
+if __name__ == "__main__":
+    main()

.github/workflows/pyright-typecompleteness.yml

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+name: Pyright Type Completeness
+
+on:
+  pull_request:
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  typecompleteness:
+    name: pyright --verifytypes
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+          fetch-depth: 0
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v7
+        with:
+          version: "latest"
+          python-version: "3.14"
+
+      - name: Install dependencies
+        run: uv sync --extra dev
+
+      - name: Run pyright --verifytypes on PR head
+        run: |
+          uv run pyright --outputjson --verifytypes chainladder > head.json || true
+          uv run pyright --verifytypes chainladder > head.txt || true
+          .github/scripts/append_verifytypes_step_summary.sh head.txt "PR head"
+
+      - name: Run pyright --verifytypes on PR base
+        run: |
+          git fetch origin ${{ github.event.pull_request.base.sha }}
+          git checkout ${{ github.event.pull_request.base.sha }} -- chainladder
+          uv run pyright --outputjson --verifytypes chainladder > base.json || true
+          uv run pyright --verifytypes chainladder > base.txt || true
+          git checkout ${{ github.event.pull_request.head.sha }} -- chainladder
+          .github/scripts/append_verifytypes_step_summary.sh base.txt "PR base"
+
+      - name: Build summary
+        run: |
+          uv run python .github/scripts/pyright_typecompleteness_summary.py \
+            --base base.json \
+            --head head.json \
+            --output summary.md
+
+      - name: Comment on PR
+        uses: marocchino/sticky-pull-request-comment@v2
+        with:
+          header: pyright-typecompleteness
+          path: summary.md