feat(codegen): attempt to parse groq queries with parameter in slices

packages/@sanity/cli/src/workers/typegenGenerate.ts

@@ -5,10 +5,11 @@ import {
   getResolver,
   readSchema,
   registerBabel,
+  safeParseQuery,
   TypeGenerator,
 } from '@sanity/codegen'
 import createDebug from 'debug'
-import {parse, typeEvaluate, type TypeNode} from 'groq-js'
+import {typeEvaluate, type TypeNode} from 'groq-js'
 
 const $info = createDebug('sanity:codegen:generate:info')
 
@@ -99,7 +100,7 @@ async function main() {
     }[] = []
     for (const {name: queryName, result: query} of result.queries) {
       try {
-        const ast = parse(query)
+        const ast = safeParseQuery(query)
         const queryTypes = typeEvaluate(ast, schema)
 
         const type = typeGenerator.generateTypeNodeTypes(`${queryName}Result`, queryTypes)

packages/@sanity/codegen/src/__tests__/safeParseQuery.test.ts

@@ -0,0 +1,47 @@
+import {describe, expect, test} from '@jest/globals'
+
+import {extractSliceParams, safeParseQuery} from '../safeParseQuery'
+
+const variants = [
+  {
+    query: '*[_type == "author"][$from...$to]',
+    params: ['from', 'to'],
+  },
+  {
+    query: '*[_type == "author"][$from...5]',
+    params: ['from'],
+  },
+  {
+    query: '*[_type == "author"][5...$to]',
+    params: ['to'],
+  },
+  {
+    query: '*[_type == "author"][3...5]',
+    params: [],
+  },
+  {
+    query: '*[_type == "author"][3...5] { name, "foo": *[_type == "bar"][0...$limit] }',
+    params: ['limit'],
+  },
+  {
+    query: '*[_type == "author"][$from...$to] { name, "foo": *[_type == "bar"][0...$limit] }',
+    params: ['from', 'to', 'limit'],
+  },
+]
+describe('safeParseQuery', () => {
+  test.each(variants)('can extract: $query', async (variant) => {
+    const params = collectAll(extractSliceParams(variant.query))
+    expect(params).toStrictEqual(variant.params)
+  })
+  test.each(variants)('can parse: $query', async (variant) => {
+    safeParseQuery(variant.query)
+  })
+})
+
+function collectAll<T>(iterator: Generator<T>) {
+  const res = []
+  for (const item of iterator) {
+    res.push(item)
+  }
+  return res
+}

packages/@sanity/codegen/src/_exports/index.ts

@@ -1,5 +1,6 @@
 export {type CodegenConfig, readConfig} from '../readConfig'
 export {readSchema} from '../readSchema'
+export {safeParseQuery} from '../safeParseQuery'
 export {findQueriesInPath} from '../typescript/findQueriesInPath'
 export {findQueriesInSource} from '../typescript/findQueriesInSource'
 export {getResolver} from '../typescript/moduleResolver'

packages/@sanity/codegen/src/safeParseQuery.ts

@@ -0,0 +1,39 @@
+import {parse} from 'groq-js'
+
+/**
+ * safeParseQuery parses a GROQ query string, but first attempts to extract any parameters used in slices. This method is _only_
+ * intended for use in type generation where we don't actually execute the parsed AST on a dataset, and should not be used elsewhere.
+ * @internal
+ */
+export function safeParseQuery(query: string) {
+  const params: Record<string, unknown> = {}
+
+  for (const param of extractSliceParams(query)) {
+    params[param] = 0 // we don't care about the value, just the type
+  }
+  return parse(query, {params})
+}
+
+/**
+ * Finds occurences of `[($start|{number})..($end|{number})]` in a query string and returns the start and end values, and return
+ * the names of the start and end variables.
+ * @internal
+ */
+export function* extractSliceParams(query: string): Generator<string> {
+  const sliceRegex = /\[(\$(\w+)|\d)\.\.\.?(\$(\w+)|\d)\]/g
+  const matches = query.matchAll(sliceRegex)
+  if (!matches) {
+    return
+  }
+  const params = new Set<string>()
+  for (const match of matches) {
+    const start = match[1] === `$${match[2]}` ? match[2] : null
+    if (start !== null) {
+      yield start
+    }
+    const end = match[3] === `$${match[4]}` ? match[4] : null
+    if (end !== null) {
+      yield end
+    }
+  }
+}