test: add c8 coverage harness with source-map remapping

- npm run coverage runs the full suite under c8 - Wire inline source maps into the esbuild test bundles - Redirect bundles into repo (.test-bundles) under coverage so c8 processes them; cleaned automatically after the run - Fix esbuild->v8-to-istanbul source path remap (tests/coverage-sourcemap.js) - .c8rc.json, .gitignore, dev-dep c8 Note: statement/function totals are degenerate under esbuild bundling; branch coverage + HTML report are the reliable signals. Change-Id: I880f5ee1e9a8e5368e27a8e274825f917d972269
2026-07-22 06:53:43 +00:00 · 2026-05-16 00:22:31 +08:00 · 2026-05-16 00:22:31 +08:00 · 606593e39b
commit 606593e39b
parent de66de5b5c
7 changed files with 880 additions and 3 deletions
--- a/.c8rc.json
+++ b/.c8rc.json
@ -0,0 +1,16 @@
+{
+  "all": false,
+  "src": ["src"],
+  "include": ["src/**/*.ts", "main.ts"],
+  "exclude": [
+    "src/test-exports.ts",
+    "tests/**",
+    "scripts/**",
+    ".e2e/**",
+    "**/node_modules/**"
+  ],
+  "excludeAfterRemap": true,
+  "reporter": ["text-summary", "text", "html", "json-summary"],
+  "reportsDirectory": "coverage",
+  "tempDirectory": "coverage/.tmp"
+}
--- a/.gitignore
+++ b/.gitignore
@ -18,6 +18,10 @@ dist/
 main.js
 main.js.map

+# Coverage
+coverage/
+.test-bundles/
+
 # Agent state
 .agent/
 .claude/
--- a/package-lock.json
+++ b/package-lock.json
@ -11,6 +11,7 @@
        "@biomejs/biome": "^2.4.13",
        "@types/node": "^22.10.2",
        "@typescript-eslint/parser": "^8.59.1",
+        "c8": "^10.1.3",
        "esbuild": "^0.24.2",
        "eslint": "^9.39.4",
        "eslint-plugin-obsidianmd": "^0.2.9",
@ -18,6 +19,16 @@
        "typescript": "^5.7.2"
      }
    },
+    "node_modules/@bcoe/v8-coverage": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@bcoe/v8-coverage/-/v8-coverage-1.0.2.tgz",
+      "integrity": "sha512-6zABk/ECA/QYSCQ1NGiVwwbQerUCZ+TQbp64Q3AgmfNvurHH0j8TtXa1qbShXA6qqkpAj4V5W8pP6mLe1mcMqA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
    "node_modules/@biomejs/biome": {
      "version": "2.4.13",
      "resolved": "https://registry.npmjs.org/@biomejs/biome/-/biome-2.4.13.tgz",
@ -929,6 +940,62 @@
        "url": "https://github.com/sponsors/nzakas"
      }
    },
+    "node_modules/@isaacs/cliui": {
+      "version": "8.0.2",
+      "resolved": "https://registry.npmjs.org/@isaacs/cliui/-/cliui-8.0.2.tgz",
+      "integrity": "sha512-O8jcjabXaleOG9DQ0+ARXWZBTfnP4WNAqzuiJK7ll44AmxGKv/J2M4TPjxjY3znBCfvBXFzucm1twdyFybFqEA==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "string-width": "^5.1.2",
+        "string-width-cjs": "npm:string-width@^4.2.0",
+        "strip-ansi": "^7.0.1",
+        "strip-ansi-cjs": "npm:strip-ansi@^6.0.1",
+        "wrap-ansi": "^8.1.0",
+        "wrap-ansi-cjs": "npm:wrap-ansi@^7.0.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@istanbuljs/schema": {
+      "version": "0.1.6",
+      "resolved": "https://registry.npmjs.org/@istanbuljs/schema/-/schema-0.1.6.tgz",
+      "integrity": "sha512-+Sg6GCR/wy1oSmQDFq4LQDAhm3ETKnorxN+y5nbLULOR3P0c14f2Wurzj3/xqPXtasLFfHd5iRFQ7AJt4KH2cw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/@jridgewell/resolve-uri": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.2.tgz",
+      "integrity": "sha512-bRISgCIjP20/tbWSPWMEi54QVPRZExkuD9lJL+UIxUKtwVJA8wW1Trb1jMs1RFXo1CBTNZ/5hpC9QvmKWdopKw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.0.0"
+      }
+    },
+    "node_modules/@jridgewell/sourcemap-codec": {
+      "version": "1.5.5",
+      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.5.5.tgz",
+      "integrity": "sha512-cYQ9310grqxueWbl+WuIUIaiUaDcj7WOq5fVhEljNVgRfOUhY9fy2zTvfoqWsnebh8Sl70VScFbICvJnLKB0Og==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@jridgewell/trace-mapping": {
+      "version": "0.3.31",
+      "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.31.tgz",
+      "integrity": "sha512-zzNR+SdQSDJzc8joaeP8QQoCQr8NuYx2dIIytl1QeBEZHJ9uW6hebsrYgbz8hJwUQao3TWCMtmfV8Nu1twOLAw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/resolve-uri": "^3.1.0",
+        "@jridgewell/sourcemap-codec": "^1.4.14"
+      }
+    },
    "node_modules/@marijn/find-cluster-break": {
      "version": "1.0.2",
      "resolved": "https://registry.npmjs.org/@marijn/find-cluster-break/-/find-cluster-break-1.0.2.tgz",
@ -975,6 +1042,17 @@
        "ret": "~0.1.10"
      }
    },
+    "node_modules/@pkgjs/parseargs": {
+      "version": "0.11.0",
+      "resolved": "https://registry.npmjs.org/@pkgjs/parseargs/-/parseargs-0.11.0.tgz",
+      "integrity": "sha512-+1VkjdD0QBLPodGrJUeqarH8VAIvQODIbwh9XpP5Syisf7YoQgsJKPNFoqqLQlu+VQ/tVSshMR6loPMn8U+dPg==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "engines": {
+        "node": ">=14"
+      }
+    },
    "node_modules/@pkgr/core": {
      "version": "0.1.2",
      "resolved": "https://registry.npmjs.org/@pkgr/core/-/core-0.1.2.tgz",
@ -1023,6 +1101,13 @@
      "dev": true,
      "license": "MIT"
    },
+    "node_modules/@types/istanbul-lib-coverage": {
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.6.tgz",
+      "integrity": "sha512-2QF/t/auWm0lsy8XtKVPG19v3sSOQlJe/YHZgfjb/KBBHOGSV+J2q/S671rcq9uTBrLAXmZpqJiaQbMT+zNU1w==",
+      "dev": true,
+      "license": "MIT"
+    },
    "node_modules/@types/json-schema": {
      "version": "7.0.15",
      "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.15.tgz",
@ -1327,6 +1412,19 @@
        "url": "https://github.com/sponsors/epoberezkin"
      }
    },
+    "node_modules/ansi-regex": {
+      "version": "6.2.2",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.2.2.tgz",
+      "integrity": "sha512-Bq3SmSpyFHaWjPk8If9yc6svM8c56dB5BAtW4Qbw5jHTwwXXcTLoRMkpDJp6VL0XzlWaCHTXrkFURMYmD0sLqg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-regex?sponsor=1"
+      }
+    },
    "node_modules/ansi-styles": {
      "version": "4.3.0",
      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
@ -1559,6 +1657,40 @@
        "node": "18 || 20 || >=22"
      }
    },
+    "node_modules/c8": {
+      "version": "10.1.3",
+      "resolved": "https://registry.npmjs.org/c8/-/c8-10.1.3.tgz",
+      "integrity": "sha512-LvcyrOAaOnrrlMpW22n690PUvxiq4Uf9WMhQwNJ9vgagkL/ph1+D4uvjvDA5XCbykrc0sx+ay6pVi9YZ1GnhyA==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "@bcoe/v8-coverage": "^1.0.1",
+        "@istanbuljs/schema": "^0.1.3",
+        "find-up": "^5.0.0",
+        "foreground-child": "^3.1.1",
+        "istanbul-lib-coverage": "^3.2.0",
+        "istanbul-lib-report": "^3.0.1",
+        "istanbul-reports": "^3.1.6",
+        "test-exclude": "^7.0.1",
+        "v8-to-istanbul": "^9.0.0",
+        "yargs": "^17.7.2",
+        "yargs-parser": "^21.1.1"
+      },
+      "bin": {
+        "c8": "bin/c8.js"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "monocart-coverage-reports": "^2"
+      },
+      "peerDependenciesMeta": {
+        "monocart-coverage-reports": {
+          "optional": true
+        }
+      }
+    },
    "node_modules/call-bind": {
      "version": "1.0.9",
      "resolved": "https://registry.npmjs.org/call-bind/-/call-bind-1.0.9.tgz",
@ -1636,6 +1768,84 @@
        "url": "https://github.com/chalk/chalk?sponsor=1"
      }
    },
+    "node_modules/cliui": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-8.0.1.tgz",
+      "integrity": "sha512-BSeNnyus75C4//NQ9gQt1/csTXyo/8Sb+afLAkzAptFuMsod9HFokGNudZpi/oQV73hnVK+sR+5PVRMd+Dr7YQ==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "string-width": "^4.2.0",
+        "strip-ansi": "^6.0.1",
+        "wrap-ansi": "^7.0.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/cliui/node_modules/ansi-regex": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/cliui/node_modules/emoji-regex": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+      "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/cliui/node_modules/string-width": {
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+      "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^8.0.0",
+        "is-fullwidth-code-point": "^3.0.0",
+        "strip-ansi": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/cliui/node_modules/strip-ansi": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/cliui/node_modules/wrap-ansi": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
+      "integrity": "sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^4.0.0",
+        "string-width": "^4.1.0",
+        "strip-ansi": "^6.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
+      }
+    },
    "node_modules/color-convert": {
      "version": "2.0.1",
      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
@ -1663,6 +1873,13 @@
      "dev": true,
      "license": "MIT"
    },
+    "node_modules/convert-source-map": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-2.0.0.tgz",
+      "integrity": "sha512-Kvp459HrV2FEJ1CAsi1Ku+MY3kasH19TFykTz2xWmMeq6bk2NU3XXvfJ+Q61m0xktWwt+1HSYf3JZsTms3aRJg==",
+      "dev": true,
+      "license": "MIT"
+    },
    "node_modules/crelt": {
      "version": "1.0.6",
      "resolved": "https://registry.npmjs.org/crelt/-/crelt-1.0.6.tgz",
@ -1829,6 +2046,20 @@
        "node": ">= 0.4"
      }
    },
+    "node_modules/eastasianwidth": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/eastasianwidth/-/eastasianwidth-0.2.0.tgz",
+      "integrity": "sha512-I88TYZWc9XiYHRQ4/3c5rjjfgkjhLyW2luGIheGERbNQ6OY7yTybanSpDXZa8y7VUP9YmDcYa+eyq4ca7iLqWA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/emoji-regex": {
+      "version": "9.2.2",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-9.2.2.tgz",
+      "integrity": "sha512-L18DaJsXSUk2+42pv8mLs5jJT2hqFkFE4j21wOmgbUqsZ2hL72NsUU785g9RXgo3s0ZNgVl42TiHp3ZtOv/Vyg==",
+      "dev": true,
+      "license": "MIT"
+    },
    "node_modules/empathic": {
      "version": "2.0.0",
      "resolved": "https://registry.npmjs.org/empathic/-/empathic-2.0.0.tgz",
@ -2071,6 +2302,16 @@
        "@esbuild/win32-x64": "0.24.2"
      }
    },
+    "node_modules/escalade": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.2.0.tgz",
+      "integrity": "sha512-WUj2qlxaQtO4g6Pq5c29GTcWGDyd8itL8zTlipgECz3JesAiiOKotd8JU6otB3PACgG6xkJUyVhboMS+bje/jA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
    "node_modules/escape-string-regexp": {
      "version": "4.0.0",
      "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-4.0.0.tgz",
@ -2927,6 +3168,23 @@
        "url": "https://github.com/sponsors/ljharb"
      }
    },
+    "node_modules/foreground-child": {
+      "version": "3.3.1",
+      "resolved": "https://registry.npmjs.org/foreground-child/-/foreground-child-3.3.1.tgz",
+      "integrity": "sha512-gIXjKqtFuWEgzFRJA9WCQeSJLZDjgJUOMCMzxtvFq/37KojM1BFGufqsCy0r4qSQmYLsZYMeyRqzIWOMup03sw==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "cross-spawn": "^7.0.6",
+        "signal-exit": "^4.0.1"
+      },
+      "engines": {
+        "node": ">=14"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
    "node_modules/function-bind": {
      "version": "1.1.2",
      "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.2.tgz",
@ -2978,6 +3236,16 @@
        "node": ">= 0.4"
      }
    },
+    "node_modules/get-caller-file": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
+      "integrity": "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==",
+      "dev": true,
+      "license": "ISC",
+      "engines": {
+        "node": "6.* || 8.* || >= 10.*"
+      }
+    },
    "node_modules/get-intrinsic": {
      "version": "1.3.0",
      "resolved": "https://registry.npmjs.org/get-intrinsic/-/get-intrinsic-1.3.0.tgz",
@ -3048,6 +3316,28 @@
        "url": "https://github.com/privatenumber/get-tsconfig?sponsor=1"
      }
    },
+    "node_modules/glob": {
+      "version": "10.5.0",
+      "resolved": "https://registry.npmjs.org/glob/-/glob-10.5.0.tgz",
+      "integrity": "sha512-DfXN8DfhJ7NH3Oe7cFmu3NCu1wKbkReJ8TorzSAFbSKrlNaQSKfIzqYqVY8zlbs2NLBbWpRiU52GX2PbaBVNkg==",
+      "deprecated": "Old versions of glob are not supported, and contain widely publicized security vulnerabilities, which have been fixed in the current version. Please update. Support for old versions may be purchased (at exorbitant rates) by contacting i@izs.me",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "foreground-child": "^3.1.0",
+        "jackspeak": "^3.1.2",
+        "minimatch": "^9.0.4",
+        "minipass": "^7.1.2",
+        "package-json-from-dist": "^1.0.0",
+        "path-scurry": "^1.11.1"
+      },
+      "bin": {
+        "glob": "dist/esm/bin.mjs"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
    "node_modules/glob-parent": {
      "version": "6.0.2",
      "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-6.0.2.tgz",
@ -3061,6 +3351,39 @@
        "node": ">=10.13.0"
      }
    },
+    "node_modules/glob/node_modules/balanced-match": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
+      "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/glob/node_modules/brace-expansion": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.1.0.tgz",
+      "integrity": "sha512-TN1kCZAgdgweJhWWpgKYrQaMNHcDULHkWwQIspdtjV4Y5aurRdZpjAqn6yX3FPqTA9ngHCc4hJxMAMgGfve85w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "balanced-match": "^1.0.0"
+      }
+    },
+    "node_modules/glob/node_modules/minimatch": {
+      "version": "9.0.9",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.9.tgz",
+      "integrity": "sha512-OBwBN9AL4dqmETlpS2zasx+vTeWclWzkblfZk7KTA5j3jeOONz/tRCnZomUyvNg83wL5Zv9Ss6HMJXAgL8R2Yg==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "brace-expansion": "^2.0.2"
+      },
+      "engines": {
+        "node": ">=16 || 14 >=14.17"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
    "node_modules/globals": {
      "version": "14.0.0",
      "resolved": "https://registry.npmjs.org/globals/-/globals-14.0.0.tgz",
@ -3205,6 +3528,13 @@
        "node": ">= 0.4"
      }
    },
+    "node_modules/html-escaper": {
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+      "version": "6.2.3",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-6.2.3.tgz",
+      "integrity": "sha512-4Dj6M28JB+oAH8kFkTLUo+a2jwOFkuqb3yucU0CANcRRUbxS0cP0nZYCGjcc3BNXwRIsUVmDGgzawme7zvJHvg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/y18n": {
+      "version": "5.0.8",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
+      "integrity": "sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==",
+      "dev": true,
+      "license": "ISC",
+      "engines": {
+        "node": ">=10"
+      }
+    },
    "node_modules/yaml": {
      "version": "2.8.4",
      "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.8.4.tgz",
@ -5280,6 +5994,80 @@
        "url": "https://opencollective.com/eslint"
      }
    },
+    "node_modules/yargs": {
+      "version": "17.7.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.2.tgz",
+      "integrity": "sha512-7dSzzRQ++CKnNI/krKnYRV7JKKPUXMEh61soaHKg9mrWEhzFWhFnxPxGl+69cD1Ou63C13NUPCnmIcrvqCuM6w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "cliui": "^8.0.1",
+        "escalade": "^3.1.1",
+        "get-caller-file": "^2.0.5",
+        "require-directory": "^2.1.1",
+        "string-width": "^4.2.3",
+        "y18n": "^5.0.5",
+        "yargs-parser": "^21.1.1"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/yargs-parser": {
+      "version": "21.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-21.1.1.tgz",
+      "integrity": "sha512-tVpsJW7DdjecAiFpbIB1e3qxIQsE6NoPc5/eTdrbbIC4h0LVsWhnoa3g+m2HclBIujHzsxZ4VJVA+GUuc2/LBw==",
+      "dev": true,
+      "license": "ISC",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/yargs/node_modules/ansi-regex": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/yargs/node_modules/emoji-regex": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+      "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/yargs/node_modules/string-width": {
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+      "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^8.0.0",
+        "is-fullwidth-code-point": "^3.0.0",
+        "strip-ansi": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/yargs/node_modules/strip-ansi": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
    "node_modules/yocto-queue": {
      "version": "0.1.0",
      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
--- a/package.json
+++ b/package.json
@ -7,6 +7,7 @@
    "build": "node esbuild.config.mjs production",
    "dev": "node esbuild.config.mjs watch",
    "typecheck": "tsc --noEmit",
+    "coverage": "c8 node scripts/run-tests.mjs --all; rm -rf .test-bundles",
    "lint": "biome check main.ts src/ tests/ scripts/ .e2e/scripts/",
    "lint:fix": "biome check --write main.ts src/ tests/ scripts/ .e2e/scripts/",
    "lint:obsidian": "eslint main.ts src/",
@ -26,6 +27,7 @@
    "@biomejs/biome": "^2.4.13",
    "@types/node": "^22.10.2",
    "@typescript-eslint/parser": "^8.59.1",
+    "c8": "^10.1.3",
    "esbuild": "^0.24.2",
    "eslint": "^9.39.4",
    "eslint-plugin-obsidianmd": "^0.2.9",
--- a/tests/coverage-sourcemap.js
+++ b/tests/coverage-sourcemap.js
@ -0,0 +1,42 @@
+'use strict';
+
+// esbuild emits inline source maps whose `sources` are relative to the bundle
+// file (deep under .test-bundles/) with a `sourceRoot`. v8-to-istanbul / the
+// source-map library resolve those inconsistently and produce wrong paths like
+// `/Users/.../github.com/src/batch.ts`, so c8 finds nothing to report.
+//
+// This rewrites the inline map in-place so every `source` is an absolute path
+// to the real repo file and `sourceRoot` is cleared — making the remap exact.
+// No-op when coverage is not active.
+
+const fs = require('fs');
+const path = require('path');
+
+const MARKER = '//# sourceMappingURL=data:application/json;base64,';
+
+function fixInlineSourceMap(outfile, repoRoot) {
+  if (!process.env.NODE_V8_COVERAGE) return;
+  const code = fs.readFileSync(outfile, 'utf8');
+  const idx = code.lastIndexOf(MARKER);
+  if (idx === -1) return;
+  const b64 = code.slice(idx + MARKER.length).trim();
+  const map = JSON.parse(Buffer.from(b64, 'base64').toString('utf8'));
+  // esbuild keeps `sources` relative to the bundle file's directory regardless
+  // of `sourceRoot`; resolving against sourceRoot double-counts and corrupts
+  // the path. Always resolve against the bundle directory.
+  const base = path.dirname(outfile);
+
+  map.sources = map.sources.map((src) => {
+    if (src.startsWith('stub:') || src.includes('obsidian-stub')) return src;
+    const abs = path.resolve(base, src);
+    // Strip any leftover climbing artifacts; keep the real repo path.
+    const i = abs.indexOf(repoRoot);
+    return i === -1 ? abs : abs.slice(i);
+  });
+  delete map.sourceRoot;
+
+  const fixed = Buffer.from(JSON.stringify(map), 'utf8').toString('base64');
+  fs.writeFileSync(outfile, code.slice(0, idx) + MARKER + fixed);
+}
+
+module.exports = { fixInlineSourceMap };
--- a/tests/direct-test-setup.js
+++ b/tests/direct-test-setup.js
@ -10,7 +10,12 @@ if (typeof globalThis.activeWindow === 'undefined') {
 }

 const repoRoot = path.join(__dirname, '..');
-const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), 'parallel-reader-tests-'));
+// Under c8, bundles must live inside the repo so c8 processes their coverage
+// (it ignores scripts outside cwd before source-map remap). Otherwise /tmp.
+const bundleParent = process.env.NODE_V8_COVERAGE
+  ? fs.mkdirSync(path.join(repoRoot, '.test-bundles'), { recursive: true }) || path.join(repoRoot, '.test-bundles')
+  : os.tmpdir();
+const tempDir = fs.mkdtempSync(path.join(bundleParent, 'parallel-reader-tests-'));

 async function requireBundledModule(relativePath) {
  const entry = path.join(repoRoot, relativePath);
@ -21,6 +26,9 @@ async function requireBundledModule(relativePath) {
    platform: 'node',
    format: 'cjs',
    outfile,
+    sourcemap: 'inline',
+    sourcesContent: true,
+    sourceRoot: repoRoot,
    plugins: [
      {
        name: 'obsidian-stub',
@ -35,10 +43,14 @@ async function requireBundledModule(relativePath) {
      },
    ],
  });
+  require('./coverage-sourcemap').fixInlineSourceMap(outfile, repoRoot);
  return require(outfile);
 }

 function cleanup() {
+  // Skipped under c8 coverage: c8 reads V8 coverage at exit and needs the
+  // bundled file (with its inline source map) still on disk to remap to src/.
+  if (process.env.NODE_V8_COVERAGE) return;
  fs.rmSync(tempDir, { recursive: true, force: true });
 }

--- a/tests/test-setup.js
+++ b/tests/test-setup.js
@ -17,7 +17,12 @@ const { getRequestUrlMock, setRequestUrlMock } = require('./obsidian-mock');
 // Bundle test-exports.ts synchronously with obsidian marked as external.
 // The bundled code will require('obsidian') at runtime, hitting our mock.
 const repoRoot = path.join(__dirname, '..');
-const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), 'parallel-reader-test-setup-'));
+// Under c8, bundles must live inside the repo so c8 processes their coverage
+// (it ignores scripts outside cwd before source-map remap). Otherwise /tmp.
+const bundleParent = process.env.NODE_V8_COVERAGE
+  ? fs.mkdirSync(path.join(repoRoot, '.test-bundles'), { recursive: true }) || path.join(repoRoot, '.test-bundles')
+  : os.tmpdir();
+const tempDir = fs.mkdtempSync(path.join(bundleParent, 'parallel-reader-test-setup-'));
 const outfile = path.join(tempDir, 'test-exports.cjs');

 esbuild.buildSync({
@ -27,12 +32,20 @@ esbuild.buildSync({
  format: 'cjs',
  outfile,
  external: ['obsidian'],
+  sourcemap: 'inline',
+  sourcesContent: true,
+  sourceRoot: repoRoot,
 });

+require('./coverage-sourcemap').fixInlineSourceMap(outfile, repoRoot);
+
 const t = require(outfile);

-// Clean up temp bundle on process exit.
+// Clean up temp bundle on process exit. Skipped under c8 coverage:
+// c8 reads V8 coverage at exit and needs the bundled file (with its
+// inline source map) still on disk to remap back to src/*.ts.
 process.on('exit', () => {
+  if (process.env.NODE_V8_COVERAGE) return;
  try {
    fs.rmSync(tempDir, { recursive: true, force: true });
  } catch (_) {