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--- Types ---\n\nexport interface Alert {\n severity: \"error\" | \"warning\" | \"suggestion\";\n message: string;\n line: number;\n span: [number, number]; // character offset within the line\n match: string;\n action: { name: string; params: string[] } | null;\n}\n\nexport interface LintResult {\n alerts: Alert[];\n summary: {\n total: number;\n errors: number;\n warnings: number;\n suggestions: number;\n };\n}\n\n// --- Rule types (mirrors Vale's YAML rule format) ---\n\ninterface ExistenceRule {\n type: \"existence\";\n check: string;\n message: string;\n level: \"error\" | \"warning\" | \"suggestion\";\n link?: string;\n ignorecase?: boolean;\n nonword?: boolean;\n scope?: \"heading\" | \"sentence\" | \"text\";\n tokens: string[];\n action?: { name: string; params: string[] };\n}\n\ninterface SubstitutionRule {\n type: \"substitution\";\n check: string;\n message: string;\n level: \"error\" | \"warning\" | \"suggestion\";\n link?: string;\n ignorecase?: boolean;\n nonword?: boolean;\n swap: Record;\n action?: { name: string; params: string[] };\n}\n\ninterface RepetitionRule {\n type: \"repetition\";\n check: string;\n message: string;\n level: \"error\" | \"warning\" | \"suggestion\";\n link?: string;\n max: number;\n action?: { name: string; params: string[] };\n}\n\ntype Rule = ExistenceRule | SubstitutionRule | RepetitionRule;\n\n// --- Built-in rules (ported from vale-cli/Google style guide) ---\n\nconst rules: Rule[] = [\n // --- Existence rules ---\n {\n type: \"existence\",\n check: \"Google.Will\",\n message: \"Avoid using '%s'.\",\n link: \"https://developers.google.com/style/tense\",\n ignorecase: true,\n level: \"warning\",\n tokens: [\"will\"],\n },\n {\n type: \"existence\",\n check: \"Google.We\",\n message: \"Try to avoid using first-person plural like '%s'.\",\n link: \"https://developers.google.com/style/pronouns#personal-pronouns\",\n ignorecase: true,\n level: \"warning\",\n tokens: [\"we\", \"we'(?:ve|re)\", \"ours?\", \"us\", \"let's\"],\n },\n {\n type: \"existence\",\n check: \"Google.FirstPerson\",\n message: \"Avoid first-person pronouns such as '%s'.\",\n link: \"https://developers.google.com/style/pronouns#personal-pronouns\",\n ignorecase: true,\n nonword: true,\n level: \"warning\",\n tokens: [\n \"(?:^|\\\\s)I\\\\s\",\n \"(?:^|\\\\s)I,\\\\s\",\n \"\\\\bI'm\\\\b\",\n \"\\\\bme\\\\b\",\n \"\\\\bmy\\\\b\",\n \"\\\\bmine\\\\b\",\n ],\n },\n {\n type: \"existence\",\n check: \"Google.Slang\",\n message: \"Don't use internet slang abbreviations such as '%s'.\",\n link: \"https://developers.google.com/style/abbreviations\",\n ignorecase: true,\n level: \"error\",\n tokens: [\"tl;dr\", \"ymmv\", \"rtfm\", \"imo\", \"fwiw\"],\n },\n {\n type: \"existence\",\n check: \"Google.Exclamation\",\n message: \"Don't use exclamation points in text.\",\n link: \"https://developers.google.com/style/exclamation-points\",\n nonword: true,\n level: \"error\",\n action: { name: \"edit\", params: [\"trim_right\", \"!\"] },\n tokens: [\"\\\\w+!(?:\\\\s|$)\"],\n },\n {\n type: \"existence\",\n check: \"Google.HeadingPunctuation\",\n message: \"Don't put a period at the end of a heading.\",\n link: \"https://developers.google.com/style/capitalization#capitalization-in-titles-and-headings\",\n nonword: true,\n level: \"warning\",\n scope: \"heading\",\n action: { name: \"edit\", params: [\"trim_right\", \".\"] },\n tokens: [\"[a-z0-9][.]\\\\s*$\"],\n },\n {\n type: \"existence\",\n check: \"Google.EmDash\",\n message: \"Don't put a space before or after a dash.\",\n link: \"https://developers.google.com/style/dashes\",\n nonword: true,\n level: \"error\",\n action: { name: \"edit\", params: [\"trim\", \" \"] },\n tokens: [\"\\\\s[—–]\\\\s\"],\n },\n {\n type: \"repetition\",\n check: \"Vale.Repetition\",\n message: \"Word repetition: '%s'.\",\n level: \"warning\",\n max: 1,\n },\n {\n type: \"existence\",\n check: \"Vale.WeaselWords\",\n message: \"Avoid weasel words like '%s'.\",\n level: \"suggestion\",\n ignorecase: true,\n tokens: [\n \"actually\",\n \"basically\",\n \"certainly\",\n \"clearly\",\n \"just\",\n \"really\",\n \"simply\",\n \"very\",\n \"fairly\",\n \"quite\",\n \"somewhat\",\n \"rather\",\n ],\n },\n {\n type: \"existence\",\n check: \"Vale.PassiveVoice\",\n message: \"Possible passive voice: '%s'.\",\n level: \"suggestion\",\n ignorecase: true,\n tokens: [\n \"\\\\b(?:is|are|was|were|be|been|being)\\\\s+\\\\w+ed\\\\b\",\n \"\\\\b(?:is|are|was|were|be|been|being)\\\\s+\\\\w+en\\\\b\",\n ],\n },\n // --- Substitution rules ---\n {\n type: \"substitution\",\n check: \"Google.Latin\",\n message: \"Use '%s' instead of '%s'.\",\n link: \"https://developers.google.com/style/abbreviations\",\n ignorecase: true,\n nonword: true,\n level: \"error\",\n action: { name: \"replace\", params: [] },\n swap: {\n \"\\\\b(?:eg|e\\\\.g\\\\.)(?=[\\\\s,;])\": \"for example\",\n \"\\\\b(?:ie|i\\\\.e\\\\.)(?=[\\\\s,;])\": \"that is\",\n },\n },\n {\n type: \"substitution\",\n check: \"Google.WordList\",\n message: \"Use '%s' instead of '%s'.\",\n link: \"https://developers.google.com/style/word-list\",\n level: \"warning\",\n action: { name: \"replace\", params: [] },\n swap: {\n \"(?:e-mail|Email|E-mail)\": \"email\",\n \"(?:WiFi|wifi)\": \"Wi-Fi\",\n \"3\\\\-D\": \"3D\",\n \"file name\": \"filename\",\n \"in order to\": \"to\",\n \"functionality\": \"capability|feature\",\n \"open-source\": \"open source\",\n \"stylesheet\": \"style sheet\",\n \"url\": \"URL\",\n \"HTTPs\": \"HTTPS\",\n \"vs\\\\.\": \"versus\",\n \"approx\\\\.\": \"approximately\",\n \"autoupdate\": \"automatically update\",\n \"check box\": \"checkbox\",\n \"click on\": \"click|click in\",\n },\n },\n {\n type: \"substitution\",\n check: \"Google.Contractions\",\n message: \"Use '%s' instead of '%s'.\",\n link: \"https://developers.google.com/style/contractions\",\n ignorecase: true,\n level: \"suggestion\",\n action: { name: \"replace\", params: [] },\n swap: {\n \"are not\": \"aren't\",\n \"cannot\": \"can't\",\n \"could not\": \"couldn't\",\n \"did not\": \"didn't\",\n \"do not\": \"don't\",\n \"does not\": \"doesn't\",\n \"has not\": \"hasn't\",\n \"have not\": \"haven't\",\n \"is not\": \"isn't\",\n \"it is\": \"it's\",\n \"should not\": \"shouldn't\",\n \"that is\": \"that's\",\n \"they are\": \"they're\",\n \"was not\": \"wasn't\",\n \"we are\": \"we're\",\n \"we have\": \"we've\",\n \"were not\": \"weren't\",\n \"will not\": \"won't\",\n },\n },\n];\n\n// --- Markdown scope detection ---\n\ninterface LineScope {\n text: string;\n lineNo: number;\n scope: \"heading\" | \"text\" | \"code\";\n isCodeBlock: boolean;\n}\n\nfunction parseMarkdown(text: string): LineScope[] {\n const lines = text.split(\"\\n\");\n const scopes: LineScope[] = [];\n let inCodeBlock = false;\n let codeFence = \"\";\n\n for (let i = 0; i < lines.length; i++) {\n const line = lines[i];\n\n // Track fenced code blocks (``` or ~~~)\n const fenceMatch = line.match(/^(\\s*)(```+|~~~+)/);\n if (fenceMatch) {\n const fence = fenceMatch[2];\n if (!inCodeBlock) {\n inCodeBlock = true;\n codeFence = fence;\n } else if (fence[0] === codeFence[0]) {\n inCodeBlock = false;\n codeFence = \"\";\n }\n scopes.push({ text: line, lineNo: i + 1, scope: \"code\", isCodeBlock: true });\n continue;\n }\n\n if (inCodeBlock) {\n scopes.push({ text: line, lineNo: i + 1, scope: \"code\", isCodeBlock: true });\n continue;\n }\n\n // Detect headings (# or underlined)\n const headingMatch = line.match(/^(#{1,6})\\s+(.*)/);\n if (headingMatch) {\n scopes.push({\n text: headingMatch[2],\n lineNo: i + 1,\n scope: \"heading\",\n isCodeBlock: false,\n });\n continue;\n }\n\n // Check for underlined heading (=== or ---)\n if (i + 1 < lines.length && lines[i].trim() !== \"\") {\n const next = lines[i + 1];\n if (/^(=+)\\s*$/.test(next) || /^(-+)\\s*$/.test(next)) {\n scopes.push({\n text: line,\n lineNo: i + 1,\n scope: \"heading\",\n isCodeBlock: false,\n });\n continue;\n }\n }\n\n scopes.push({ text: line, lineNo: i + 1, scope: \"text\", isCodeBlock: false });\n }\n\n return scopes;\n}\n\n// Strip inline code from a line so we don't lint `code`\nfunction stripInlineCode(text: string): { text: string; skipRanges: [number, number][] }[] {\n // Replace `code` with spaces of same length to preserve offsets\n const result = text.replace(/`[^`]+`/g, (match) => \" \".repeat(match.length));\n return [{ text: result, skipRanges: [] }];\n}\n\n// --- Linter engine ---\n\nexport function lint(text: string): LintResult {\n const scopes = parseMarkdown(text);\n const alerts: Alert[] = [];\n\n for (const lineScope of scopes) {\n if (lineScope.scope === \"code\") continue;\n\n // Strip inline code\n const stripped = stripInlineCode(lineScope.text);\n\n for (const { text: lineText } of stripped) {\n for (const rule of rules) {\n const ruleAlerts = applyRule(rule, lineText, lineScope.lineNo, lineScope.scope);\n alerts.push(...ruleAlerts);\n }\n }\n }\n\n // Sort by line, then by position\n alerts.sort((a, b) => a.line - b.line || a.span[0] - b.span[0]);\n\n const summary = {\n total: alerts.length,\n errors: alerts.filter((a) => a.severity === \"error\").length,\n warnings: alerts.filter((a) => a.severity === \"warning\").length,\n suggestions: alerts.filter((a) => a.severity === \"suggestion\").length,\n };\n\n return { alerts, summary };\n}\n\nfunction applyRule(\n rule: Rule,\n lineText: string,\n lineNo: number,\n scope: string,\n): Alert[] {\n const alerts: Alert[] = [];\n\n // Check scope filter\n if (\"scope\" in rule && rule.scope) {\n if (scope !== rule.scope) return alerts;\n }\n\n if (rule.type === \"existence\") {\n return applyExistence(rule, lineText, lineNo);\n } else if (rule.type === \"substitution\") {\n return applySubstitution(rule, lineText, lineNo);\n } else if (rule.type === \"repetition\") {\n return applyRepetition(rule, lineText, lineNo);\n }\n\n return alerts;\n}\n\nfunction applyExistence(\n rule: ExistenceRule,\n lineText: string,\n lineNo: number,\n): Alert[] {\n const alerts: Alert[] = [];\n\n for (const token of rule.tokens) {\n const flags = rule.ignorecase ? \"gi\" : \"g\";\n const regex = new RegExp(token, flags);\n let match: RegExpExecArray | null;\n\n while ((match = regex.exec(lineText)) !== null) {\n // Avoid zero-length matches\n if (match.index === regex.lastIndex) {\n regex.lastIndex++;\n continue;\n }\n\n const matched = match[0];\n alerts.push({\n severity: rule.level,\n message: rule.message.replace(\"%s\", matched.trim()),\n line: lineNo,\n span: [match.index, match.index + matched.length],\n match: matched,\n action: rule.action ?? null,\n });\n\n // Prevent infinite loop on zero-width matches\n if (matched.length === 0) {\n regex.lastIndex++;\n }\n }\n }\n\n return alerts;\n}\n\nfunction applySubstitution(\n rule: SubstitutionRule,\n lineText: string,\n lineNo: number,\n): Alert[] {\n const alerts: Alert[] = [];\n\n for (const [pattern, replacement] of Object.entries(rule.swap)) {\n const flags = rule.ignorecase ? \"gi\" : \"g\";\n const regex = new RegExp(pattern, flags);\n let match: RegExpExecArray | null;\n\n while ((match = regex.exec(lineText)) !== null) {\n if (match.index === regex.lastIndex) {\n regex.lastIndex++;\n continue;\n }\n\n const matched = match[0];\n alerts.push({\n severity: rule.level,\n message: rule.message\n .replace(\"%s\", replacement)\n .replace(\"%s\", matched.trim()),\n line: lineNo,\n span: [match.index, match.index + matched.length],\n match: matched,\n action: rule.action ?? null,\n });\n\n if (matched.length === 0) {\n regex.lastIndex++;\n }\n }\n }\n\n return alerts;\n}\n\nfunction applyRepetition(\n rule: RepetitionRule,\n lineText: string,\n lineNo: number,\n): Alert[] {\n const alerts: Alert[] = [];\n const words = lineText.match(/\\b[a-zA-Z]+\\b/g);\n if (!words) return alerts;\n\n for (let i = 1; i < words.length; i++) {\n if (\n words[i].toLowerCase() === words[i - 1].toLowerCase() &&\n words[i].length > 2 // skip short words\n ) {\n // Find the position of the second word in the line\n const regex = new RegExp(`\\\\b${escapeRegex(words[i])}\\\\b`, \"gi\");\n let count = 0;\n let match: RegExpExecArray | null;\n while ((match = regex.exec(lineText)) !== null) {\n count++;\n if (count === 2) {\n alerts.push({\n check: rule.check,\n severity: rule.level,\n message: rule.message.replace(\"%s\", words[i]),\n line: lineNo,\n span: [match.index, match.index + match[0].length],\n match: match[0],\n link: rule.link ?? \"\",\n action: rule.action ?? null,\n });\n break;\n }\n }\n }\n }\n\n return alerts;\n}\n\nfunction escapeRegex(s: string): string {\n return s.replace(/[.*+?^${}()|[\\]\\\\]/g, \"\\\\$&\");\n}\n","// --- Types ---\n\nexport interface Alert {\n severity: \"error\" | \"warning\" | \"suggestion\";\n message: string;\n line: number;\n span: [number, number]; // character offset within the line\n match: string;\n action: { name: string; params: string[] } | null;\n}\n\nexport interface LintResult {\n alerts: Alert[];\n summary: {\n total: number;\n errors: number;\n warnings: number;\n suggestions: number;\n };\n}\n\n// --- Rule types (mirrors Vale's YAML rule format) ---\n\ninterface ExistenceRule {\n type: \"existence\";\n check: string;\n message: string;\n level: \"error\" | \"warning\" | \"suggestion\";\n link?: string;\n ignorecase?: boolean;\n nonword?: boolean;\n scope?: \"heading\" | \"sentence\" | \"text\";\n tokens: string[];\n action?: { name: string; params: string[] };\n}\n\ninterface SubstitutionRule {\n type: \"substitution\";\n check: string;\n message: string;\n level: \"error\" | \"warning\" | \"suggestion\";\n link?: string;\n ignorecase?: boolean;\n nonword?: boolean;\n swap: Record;\n action?: { name: string; params: string[] };\n}\n\ninterface RepetitionRule {\n type: \"repetition\";\n check: string;\n message: string;\n level: \"error\" | \"warning\" | \"suggestion\";\n link?: string;\n max: number;\n action?: { name: string; params: string[] };\n}\n\ntype Rule = ExistenceRule | SubstitutionRule | RepetitionRule;\n\n// --- Built-in rules (ported from vale-cli/Google style guide) ---\n\nconst rules: Rule[] = [\n // --- Existence rules ---\n {\n type: \"existence\",\n check: \"Google.Will\",\n message: \"Avoid using '%s'.\",\n link: \"https://developers.google.com/style/tense\",\n ignorecase: true,\n level: \"warning\",\n tokens: [\"will\"],\n },\n {\n type: \"existence\",\n check: \"Google.We\",\n message: \"Try to avoid using first-person plural like '%s'.\",\n link: \"https://developers.google.com/style/pronouns#personal-pronouns\",\n ignorecase: true,\n level: \"warning\",\n tokens: [\"we\", \"we'(?:ve|re)\", \"ours?\", \"us\", \"let's\"],\n },\n {\n type: \"existence\",\n check: \"Google.FirstPerson\",\n message: \"Avoid first-person pronouns such as '%s'.\",\n link: \"https://developers.google.com/style/pronouns#personal-pronouns\",\n ignorecase: true,\n nonword: true,\n level: \"warning\",\n tokens: [\n \"(?:^|\\\\s)I\\\\s\",\n \"(?:^|\\\\s)I,\\\\s\",\n \"\\\\bI'm\\\\b\",\n \"\\\\bme\\\\b\",\n \"\\\\bmy\\\\b\",\n \"\\\\bmine\\\\b\",\n ],\n },\n {\n type: \"existence\",\n check: \"Google.Slang\",\n message: \"Don't use internet slang abbreviations such as '%s'.\",\n link: \"https://developers.google.com/style/abbreviations\",\n ignorecase: true,\n level: \"error\",\n tokens: [\"tl;dr\", \"ymmv\", \"rtfm\", \"imo\", \"fwiw\"],\n },\n {\n type: \"existence\",\n check: \"Google.Exclamation\",\n message: \"Don't use exclamation points in text.\",\n link: \"https://developers.google.com/style/exclamation-points\",\n nonword: true,\n level: \"error\",\n action: { name: \"edit\", params: [\"trim_right\", \"!\"] },\n tokens: [\"\\\\w+!(?:\\\\s|$)\"],\n },\n {\n type: \"existence\",\n check: \"Google.HeadingPunctuation\",\n message: \"Don't put a period at the end of a heading.\",\n link: \"https://developers.google.com/style/capitalization#capitalization-in-titles-and-headings\",\n nonword: true,\n level: \"warning\",\n scope: \"heading\",\n action: { name: \"edit\", params: [\"trim_right\", \".\"] },\n tokens: [\"[a-z0-9][.]\\\\s*$\"],\n },\n {\n type: \"existence\",\n check: \"Google.EmDash\",\n message: \"Don't put a space before or after a dash.\",\n link: \"https://developers.google.com/style/dashes\",\n nonword: true,\n level: \"error\",\n action: { name: \"edit\", params: [\"trim\", \" \"] },\n tokens: [\"\\\\s[—–]\\\\s\"],\n },\n {\n type: \"repetition\",\n check: \"Vale.Repetition\",\n message: \"Word repetition: '%s'.\",\n level: \"warning\",\n max: 1,\n },\n {\n type: \"existence\",\n check: \"Vale.WeaselWords\",\n message: \"Avoid weasel words like '%s'.\",\n level: \"suggestion\",\n ignorecase: true,\n tokens: [\n \"actually\",\n \"basically\",\n \"certainly\",\n \"clearly\",\n \"just\",\n \"really\",\n \"simply\",\n \"very\",\n \"fairly\",\n \"quite\",\n \"somewhat\",\n \"rather\",\n ],\n },\n {\n type: \"existence\",\n check: \"Vale.PassiveVoice\",\n message: \"Possible passive voice: '%s'.\",\n level: \"suggestion\",\n ignorecase: true,\n tokens: [\n \"\\\\b(?:is|are|was|were|be|been|being)\\\\s+\\\\w+ed\\\\b\",\n \"\\\\b(?:is|are|was|were|be|been|being)\\\\s+\\\\w+en\\\\b\",\n ],\n },\n // --- Substitution rules ---\n {\n type: \"substitution\",\n check: \"Google.Latin\",\n message: \"Use '%s' instead of '%s'.\",\n link: \"https://developers.google.com/style/abbreviations\",\n ignorecase: true,\n nonword: true,\n level: \"error\",\n action: { name: \"replace\", params: [] },\n swap: {\n \"\\\\b(?:eg|e\\\\.g\\\\.)(?=[\\\\s,;])\": \"for example\",\n \"\\\\b(?:ie|i\\\\.e\\\\.)(?=[\\\\s,;])\": \"that is\",\n },\n },\n {\n type: \"substitution\",\n check: \"Google.WordList\",\n message: \"Use '%s' instead of '%s'.\",\n link: \"https://developers.google.com/style/word-list\",\n level: \"warning\",\n action: { name: \"replace\", params: [] },\n swap: {\n \"(?:e-mail|Email|E-mail)\": \"email\",\n \"(?:WiFi|wifi)\": \"Wi-Fi\",\n \"3\\\\-D\": \"3D\",\n \"file name\": \"filename\",\n \"in order to\": \"to\",\n \"functionality\": \"capability|feature\",\n \"open-source\": \"open source\",\n \"stylesheet\": \"style sheet\",\n \"url\": \"URL\",\n \"HTTPs\": \"HTTPS\",\n \"vs\\\\.\": \"versus\",\n \"approx\\\\.\": \"approximately\",\n \"autoupdate\": \"automatically update\",\n \"check box\": \"checkbox\",\n \"click on\": \"click|click in\",\n },\n },\n {\n type: \"substitution\",\n check: \"Google.Contractions\",\n message: \"Use '%s' instead of '%s'.\",\n link: \"https://developers.google.com/style/contractions\",\n ignorecase: true,\n level: \"suggestion\",\n action: { name: \"replace\", params: [] },\n swap: {\n \"are not\": \"aren't\",\n \"cannot\": \"can't\",\n \"could not\": \"couldn't\",\n \"did not\": \"didn't\",\n \"do not\": \"don't\",\n \"does not\": \"doesn't\",\n \"has not\": \"hasn't\",\n \"have not\": \"haven't\",\n \"is not\": \"isn't\",\n \"it is\": \"it's\",\n \"should not\": \"shouldn't\",\n \"that is\": \"that's\",\n \"they are\": \"they're\",\n \"was not\": \"wasn't\",\n \"we are\": \"we're\",\n \"we have\": \"we've\",\n \"were not\": \"weren't\",\n \"will not\": \"won't\",\n },\n },\n];\n\n// --- Markdown scope detection ---\n\ninterface LineScope {\n text: string;\n lineNo: number;\n scope: \"heading\" | \"text\" | \"code\";\n isCodeBlock: boolean;\n}\n\nfunction parseMarkdown(text: string): LineScope[] {\n const lines = text.split(\"\\n\");\n const scopes: LineScope[] = [];\n let inCodeBlock = false;\n let codeFence = \"\";\n\n for (let i = 0; i < lines.length; i++) {\n const line = lines[i];\n\n // Track fenced code blocks (``` or ~~~)\n const fenceMatch = line.match(/^(\\s*)(```+|~~~+)/);\n if (fenceMatch) {\n const fence = fenceMatch[2];\n if (!inCodeBlock) {\n inCodeBlock = true;\n codeFence = fence;\n } else if (fence[0] === codeFence[0]) {\n inCodeBlock = false;\n codeFence = \"\";\n }\n scopes.push({ text: line, lineNo: i + 1, scope: \"code\", isCodeBlock: true });\n continue;\n }\n\n if (inCodeBlock) {\n scopes.push({ text: line, lineNo: i + 1, scope: \"code\", isCodeBlock: true });\n continue;\n }\n\n // Detect headings (# or underlined)\n const headingMatch = line.match(/^(#{1,6})\\s+(.*)/);\n if (headingMatch) {\n scopes.push({\n text: headingMatch[2],\n lineNo: i + 1,\n scope: \"heading\",\n isCodeBlock: false,\n });\n continue;\n }\n\n // Check for underlined heading (=== or ---)\n if (i + 1 < lines.length && lines[i].trim() !== \"\") {\n const next = lines[i + 1];\n if (/^(=+)\\s*$/.test(next) || /^(-+)\\s*$/.test(next)) {\n scopes.push({\n text: line,\n lineNo: i + 1,\n scope: \"heading\",\n isCodeBlock: false,\n });\n continue;\n }\n }\n\n scopes.push({ text: line, lineNo: i + 1, scope: \"text\", isCodeBlock: false });\n }\n\n return scopes;\n}\n\n// Strip inline code from a line so we don't lint `code`\nfunction stripInlineCode(text: string): { text: string; skipRanges: [number, number][] }[] {\n // Replace `code` with spaces of same length to preserve offsets\n const result = text.replace(/`[^`]+`/g, (match) => \" \".repeat(match.length));\n return [{ text: result, skipRanges: [] }];\n}\n\n// --- Linter engine ---\n\nexport function lint(text: string): LintResult {\n const scopes = parseMarkdown(text);\n const alerts: Alert[] = [];\n\n for (const lineScope of scopes) {\n if (lineScope.scope === \"code\") continue;\n\n // Strip inline code\n const stripped = stripInlineCode(lineScope.text);\n\n for (const { text: lineText } of stripped) {\n for (const rule of rules) {\n const ruleAlerts = applyRule(rule, lineText, lineScope.lineNo, lineScope.scope);\n alerts.push(...ruleAlerts);\n }\n }\n }\n\n // Sort by line, then by position\n alerts.sort((a, b) => a.line - b.line || a.span[0] - b.span[0]);\n\n const summary = {\n total: alerts.length,\n errors: alerts.filter((a) => a.severity === \"error\").length,\n warnings: alerts.filter((a) => a.severity === \"warning\").length,\n suggestions: alerts.filter((a) => a.severity === \"suggestion\").length,\n };\n\n return { alerts, summary };\n}\n\nfunction applyRule(\n rule: Rule,\n lineText: string,\n lineNo: number,\n scope: string,\n): Alert[] {\n const alerts: Alert[] = [];\n\n // Check scope filter\n if (\"scope\" in rule && rule.scope) {\n if (scope !== rule.scope) return alerts;\n }\n\n if (rule.type === \"existence\") {\n return applyExistence(rule, lineText, lineNo);\n } else if (rule.type === \"substitution\") {\n return applySubstitution(rule, lineText, lineNo);\n } else if (rule.type === \"repetition\") {\n return applyRepetition(rule, lineText, lineNo);\n }\n\n return alerts;\n}\n\nfunction applyExistence(\n rule: ExistenceRule,\n lineText: string,\n lineNo: number,\n): Alert[] {\n const alerts: Alert[] = [];\n\n for (const token of rule.tokens) {\n const flags = rule.ignorecase ? \"gi\" : \"g\";\n const regex = new RegExp(token, flags);\n let match: RegExpExecArray | null;\n\n while ((match = regex.exec(lineText)) !== null) {\n // Avoid zero-length matches\n if (match.index === regex.lastIndex) {\n regex.lastIndex++;\n continue;\n }\n\n const matched = match[0];\n alerts.push({\n severity: rule.level,\n message: rule.message.replace(\"%s\", matched.trim()),\n line: lineNo,\n span: [match.index, match.index + matched.length],\n match: matched,\n action: rule.action ?? null,\n });\n\n // Prevent infinite loop on zero-width matches\n if (matched.length === 0) {\n regex.lastIndex++;\n }\n }\n }\n\n return alerts;\n}\n\nfunction applySubstitution(\n rule: SubstitutionRule,\n lineText: string,\n lineNo: number,\n): Alert[] {\n const alerts: Alert[] = [];\n\n for (const [pattern, replacement] of Object.entries(rule.swap)) {\n const flags = rule.ignorecase ? \"gi\" : \"g\";\n const regex = new RegExp(pattern, flags);\n let match: RegExpExecArray | null;\n\n while ((match = regex.exec(lineText)) !== null) {\n if (match.index === regex.lastIndex) {\n regex.lastIndex++;\n continue;\n }\n\n const matched = match[0];\n alerts.push({\n severity: rule.level,\n message: rule.message\n .replace(\"%s\", replacement)\n .replace(\"%s\", matched.trim()),\n line: lineNo,\n span: [match.index, match.index + matched.length],\n match: matched,\n action: rule.action ?? null,\n });\n\n if (matched.length === 0) {\n regex.lastIndex++;\n }\n }\n }\n\n return alerts;\n}\n\nfunction applyRepetition(\n rule: RepetitionRule,\n lineText: string,\n lineNo: number,\n): Alert[] {\n const alerts: Alert[] = [];\n const words = lineText.match(/\\b[a-zA-Z]+\\b/g);\n if (!words) return alerts;\n\n for (let i = 1; i < words.length; i++) {\n if (\n words[i].toLowerCase() === words[i - 1].toLowerCase() &&\n words[i].length > 2 // skip short words\n ) {\n // Find the position of the second word in the line\n const regex = new RegExp(`\\\\b${escapeRegex(words[i])}\\\\b`, \"gi\");\n let count = 0;\n let match: RegExpExecArray | null;\n while ((match = regex.exec(lineText)) !== null) {\n count++;\n if (count === 2) {\n alerts.push({\n severity: rule.level,\n message: rule.message.replace(\"%s\", words[i]),\n line: lineNo,\n span: [match.index, match.index + match[0].length],\n match: match[0],\n action: rule.action ?? null,\n });\n break;\n }\n }\n }\n }\n\n return alerts;\n}\n\nfunction escapeRegex(s: string): string {\n return s.replace(/[.*+?^${}()|[\\]\\\\]/g, \"\\\\$&\");\n}\n","createdAt",["D",1783558093293],"branchVersion","branchId","57fa5d41-3b83-45e3-a1b8-1ada3b6991f0","id","3cb69a6f-88ae-4bec-b916-a27dca7f1a04","vale-linter-api",["D",1783489078842],"deletedAt","legacyEnvVars","privacy","public","httpPrivacy","description","Markdown linter API powered by vale.sh returning structured 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{ staticHTTPServer, readFile } from \"https://esm.town/v/std/utils/index.ts\";\nimport { lint } from \"./linter.ts\";\n\nexport default staticHTTPServer(import.meta.url, async (req: Request) => {\n const url = new URL(req.url);\n const path = url.pathname;\n\n // API info\n if (req.method === \"GET\" && path === \"/api\") {\n return Response.json({\n name: \"Vale Markdown Linter API\",\n description: \"POST markdown text to get vale-style lint results as JSON\",\n usage: {\n method: \"POST\",\n \"content-type\": \"text/plain or application/json\",\n body: 'raw markdown text, or JSON: { \"markdown\": \"...\" }',\n },\n });\n }\n\n // Lint markdown\n if (req.method === \"POST\") {\n const text = await parseRequestBody(req);\n if (!text) {\n return Response.json({ error: \"No markdown text provided\" }, { status: 400 });\n }\n return Response.json(lint(text));\n }\n\n // Fall through to static server for GET /, /source, etc.\n return null;\n});\n\nasync function parseRequestBody(req: Request): Promise {\n const contentType = req.headers.get(\"content-type\") ?? \"\";\n\n if (contentType.includes(\"application/json\")) {\n const body = await req.json() as {\n markdown?: string;\n content?: string;\n text?: string;\n };\n return body.markdown ?? body.content ?? body.text ?? \"\";\n }\n\n return await req.text();\n}\n","label",[136],"6b994e5f-e784-419f-8e15-96f7765f98e2",["D",1783558093293],5,[28],"dcfaaea6-bcda-4922-afa6-ec20289fb9d0","index.html","93355a6a-7b2c-11f1-b169-1607ee4eb77e",12,["D",1783557790836],"\n\n\n \n \n Vale Linter\n \n \n \n\n\n

\n \n Vale Linter\n

Markdown · Prose Linting API

Lint your markdown.

Paste markdown on the left, preview it on the right, then run the linter to get structured JSON alerts with line numbers, severity, and suggested fixes.

\n \n

InputMarkdown

PreviewRendered

Alerts

Fix with an LLM

Copy the prompt below and paste it into ChatGPT, Claude, or any LLM. It bundles your markdown with the lint alerts and instructions to return a corrected version.

Prompt · markdown + alerts

JSON Response

application/json

view source

\n \n\n\n",[151],"pulls","branches",1,"forks","envVars",{"_165":63,"_167":63},"connections",{"_165":63,"_166":63},"count","unfilledCount","emptyCount",{"_43":150,"_32":151,"_30":152,"_137":-5,"_41":42,"_40":153,"_139":25,"_38":178,"_13":148,"_33":20,"_35":155,"_24":25,"_144":-5,"_172":179,"_27":180},{"_43":146,"_32":28,"_30":31,"_137":-5,"_41":42,"_40":14,"_139":25,"_38":175,"_13":148,"_33":34,"_35":37,"_24":25,"_144":-5,"_172":176,"_27":177},{"_43":135,"_32":136,"_30":57,"_137":-5,"_41":42,"_40":138,"_139":25,"_38":171,"_13":141,"_33":142,"_35":143,"_24":25,"_144":-5,"_172":173,"_27":174},["D",1783556715325],"children",[],[136],["D",1783558093293],[],[28],["D",1783557790836],[],[151],["D",1783489078842],["D",1789525245864],{"_100":99,"_108":104},{"_100":99,"_101":102,"_103":104,"_18":55,"_105":106,"_107":25},{"_13":89,"_32":90,"_43":42,"_91":44,"_92":-5,"_93":-5,"_94":-5,"_95":-5,"_96":-5,"_97":45,"_98":99},"ctx",{"_82":-5,"_128":219,"_220":221,"_222":223,"_224":25,"_225":25,"_226":25,"_227":59,"_228":-5,"_229":-7,"_230":-7,"_231":63,"_232":25,"_233":25,"_234":-5,"_235":25,"_236":25,"_237":25,"_238":-5},"ENV",{"_190":191,"_192":193,"_194":90,"_195":196,"_197":198,"_199":200,"_201":202,"_203":204,"_205":206,"_207":208,"_209":210,"_211":212,"_213":214,"_215":216,"_217":218},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","e87eb04e707cf64e7e532c8e8ec395f209e17f15","RENDER_GIT_BRANCH","POSTHOG_API_TOKEN","phc_nmoyuAkStEZuUp69rYlg1DZgrIt19Gx0Y4Hwf8tGgJP","POSTHOG_API_HOST","https://wart.val.town","WEB_API_TEMPLATE","https://{val}.web.val.run","APP_URL","https://www.val.town","MODULE_URL","https://esm.town","VANITY_WEB_API_TEMPLATE","https://{label}.val.run/","DENOLS_URL","https://lsp.val.town","NODE_ENV","production","CLOUDFLARE_TURNSTILE_SITE_KEY","0x4AAAAAACtaIZJH7s9rBMZ6","GOOGLE_CLIENT_ID","875989696899-jtsqkhlbdv5jrlsk8631p7ipjg3c6o62.apps.googleusercontent.com","STRIPE_PUBLISHABLE_KEY","pk_live_51N2zvWEpZTTLipIkVEwXrUG9AT0yeOOEYxszarZT1jpsZV58Ly6wlg3SltZpHN26CUalOBmUSY7adQRQiSkCZz2500qSXNkf8Y","API_URL","https://api.val.town",[],"preferencesKeybindings","default","preferencesTheme","light","preferencesFixers","preferencesCopilot","preferencesSelectionAi","preferencesCloseBrackets","preferencesChatPanelState","preferencesDprint","preferencesDenofmt","notificationCount","flagDenols","isBusinessOrgMember","businessOrgHandle","isBusinessOrgAdmin","isHigherTownieTier","navCollapsed","currentOrgId"]

Diff · v16