fix(field-usage): Crawl chained scopes

.changeset/beige-queens-worry.md

@@ -0,0 +1,5 @@
+---
+'@0no-co/graphqlsp': patch
+---
+
+Handle chained expressions while crawling scopes

packages/graphqlsp/src/fieldUsage.ts

@@ -2,6 +2,7 @@ import { ts } from './ts';
 import { parse, visit } from 'graphql';
 
 import { findNode } from './ast';
+import { PropertyAccessExpression } from 'typescript';
 
 export const UNUSED_FIELD_CODE = 52005;
 
@@ -119,6 +120,82 @@ const arrayMethods = new Set([
   'sort',
 ]);
 
+const crawlChainedExpressions = (
+  ref: ts.CallExpression,
+  pathParts: string[],
+  allFields: string[],
+  source: ts.SourceFile,
+  info: ts.server.PluginCreateInfo
+): string[] => {
+  const isChained =
+    ts.isPropertyAccessExpression(ref.expression) &&
+    arrayMethods.has(ref.expression.name.text);
+  console.log('[GRAPHQLSP]: ', isChained, ref.getFullText());
+  if (isChained) {
+    const foundRef = ref.expression;
+    const isReduce = foundRef.name.text === 'reduce';
+    let func: ts.Expression | ts.FunctionDeclaration | undefined =
+      ref.arguments[0];
+
+    const res = [];
+    if (ts.isCallExpression(ref.parent.parent)) {
+      const nestedResult = crawlChainedExpressions(
+        ref.parent.parent,
+        pathParts,
+        allFields,
+        source,
+        info
+      );
+      if (nestedResult.length) {
+        res.push(...nestedResult);
+      }
+    }
+
+    if (func && ts.isIdentifier(func)) {
+      // TODO: Scope utilities in checkFieldUsageInFile to deduplicate
+      const checker = info.languageService.getProgram()!.getTypeChecker();
+
+      const declaration = checker.getSymbolAtLocation(func)?.valueDeclaration;
+      if (declaration && ts.isFunctionDeclaration(declaration)) {
+        func = declaration;
+      } else if (
+        declaration &&
+        ts.isVariableDeclaration(declaration) &&
+        declaration.initializer
+      ) {
+        func = declaration.initializer;
+      }
+    }
+
+    if (
+      func &&
+      (ts.isFunctionDeclaration(func) ||
+        ts.isFunctionExpression(func) ||
+        ts.isArrowFunction(func))
+    ) {
+      const param = func.parameters[isReduce ? 1 : 0];
+      if (param) {
+        const scopedResult = crawlScope(
+          param.name,
+          pathParts,
+          allFields,
+          source,
+          info,
+          true
+        );
+
+        if (scopedResult.length) {
+          res.push(...scopedResult);
+        }
+      }
+    }
+
+    return res;
+  }
+
+  return [];
+};
+
 const crawlScope = (
   node: ts.BindingName,
   originalWip: Array<string>,
@@ -173,6 +250,7 @@ const crawlScope = (
     // - const pokemon = result.data.pokemon --> this initiates a new crawl with a renewed scope
     // - const { pokemon } = result.data --> this initiates a destructuring traversal which will
     //   either end up in more destructuring traversals or a scope crawl
+    console.log('[GRAPHQLSP]: ', foundRef.getFullText());
     while (
       ts.isIdentifier(foundRef) ||
       ts.isPropertyAccessExpression(foundRef) ||
@@ -219,65 +297,36 @@ const crawlScope = (
         arrayMethods.has(foundRef.name.text) &&
         ts.isCallExpression(foundRef.parent)
       ) {
-        const isReduce = foundRef.name.text === 'reduce';
-        const isSomeOrEvery =
-          foundRef.name.text === 'every' || foundRef.name.text === 'some';
         const callExpression = foundRef.parent;
-        let func: ts.Expression | ts.FunctionDeclaration | undefined =
-          callExpression.arguments[0];
-
-        if (func && ts.isIdentifier(func)) {
-          // TODO: Scope utilities in checkFieldUsageInFile to deduplicate
-          const checker = info.languageService.getProgram()!.getTypeChecker();
-
-          const declaration =
-            checker.getSymbolAtLocation(func)?.valueDeclaration;
-          if (declaration && ts.isFunctionDeclaration(declaration)) {
-            func = declaration;
-          } else if (
-            declaration &&
-            ts.isVariableDeclaration(declaration) &&
-            declaration.initializer
-          ) {
-            func = declaration.initializer;
-          }
+        const res = [];
+        const isSomeOrEvery =
+          foundRef.name.text === 'some' || foundRef.name.text === 'every';
+        console.log('[GRAPHQLSP]: ', foundRef.name.text);
+        const chainedResults = crawlChainedExpressions(
+          callExpression,
+          pathParts,
+          allFields,
+          source,
+          info
+        );
+        console.log('[GRAPHQLSP]: ', chainedResults.length);
+        if (chainedResults.length) {
+          res.push(...chainedResults);
         }
 
-        if (
-          func &&
-          (ts.isFunctionDeclaration(func) ||
-            ts.isFunctionExpression(func) ||
-            ts.isArrowFunction(func))
-        ) {
-          const param = func.parameters[isReduce ? 1 : 0];
-          if (param) {
-            const res = crawlScope(
-              param.name,
-              pathParts,
-              allFields,
-              source,
-              info,
-              true
-            );
-
-            if (
-              ts.isVariableDeclaration(callExpression.parent) &&
-              !isSomeOrEvery
-            ) {
-              const varRes = crawlScope(
-                callExpression.parent.name,
-                pathParts,
-                allFields,
-                source,
-                info,
-                true
-              );
-              res.push(...varRes);
-            }
-
-            return res;
-          }
+        if (ts.isVariableDeclaration(callExpression.parent) && !isSomeOrEvery) {
+          const varRes = crawlScope(
+            callExpression.parent.name,
+            pathParts,
+            allFields,
+            source,
+            info,
+            true
+          );
+          res.push(...varRes);
         }
+
+        return res;
       } else if (
         ts.isPropertyAccessExpression(foundRef) &&
         !pathParts.includes(foundRef.name.text)

test/e2e/fixture-project-tada/introspection.d.ts

@@ -31,3 +31,9 @@ export type introspection = {
 };
 
 import * as gqlTada from 'gql.tada';
+
+declare module 'gql.tada' {
+  interface setupSchema {
+    introspection: introspection;
+  }
+}

test/e2e/fixture-project-unused-fields/fixtures/chained-usage.ts

@@ -0,0 +1,37 @@
+import { useQuery } from 'urql';
+import { useMemo } from 'react';
+import { graphql } from './gql';
+
+const PokemonsQuery = graphql(
+  `
+    query Pok {
+      pokemons {
+        name
+        maxCP
+        maxHP
+        fleeRate
+      }
+    }
+  `
+);
+
+const Pokemons = () => {
+  const [result] = useQuery({
+    query: PokemonsQuery,
+  });
+
+  const results = useMemo(() => {
+    if (!result.data?.pokemons) return [];
+    return (
+      result.data.pokemons
+        .filter(i => i?.name === 'Pikachu')
+        .map(p => ({
+          x: p?.maxCP,
+          y: p?.maxHP,
+        })) ?? []
+    );
+  }, [result.data?.pokemons]);
+
+  // @ts-ignore
+  return results;
+};

test/e2e/fixture-project-unused-fields/fixtures/gql/gql.ts

@@ -17,6 +17,8 @@ const documents = {
     types.PokemonFieldsFragmentDoc,
   '\n  query Po($id: ID!) {\n    pokemon(id: $id) {\n      id\n      fleeRate\n      ...pokemonFields\n      attacks {\n        special {\n          name\n          damage\n        }\n      }\n      weight {\n        minimum\n        maximum\n      }\n      name\n      __typename\n    }\n  }\n':
     types.PoDocument,
+  '\n    query Pok {\n      pokemons {\n        name\n        maxCP\n        maxHP\n        fleeRate\n      }\n    }\n  ':
+    types.PokDocument,
 };
 
 /**
@@ -45,6 +47,12 @@ export function graphql(
 export function graphql(
   source: '\n  query Po($id: ID!) {\n    pokemon(id: $id) {\n      id\n      fleeRate\n      ...pokemonFields\n      attacks {\n        special {\n          name\n          damage\n        }\n      }\n      weight {\n        minimum\n        maximum\n      }\n      name\n      __typename\n    }\n  }\n'
 ): (typeof documents)['\n  query Po($id: ID!) {\n    pokemon(id: $id) {\n      id\n      fleeRate\n      ...pokemonFields\n      attacks {\n        special {\n          name\n          damage\n        }\n      }\n      weight {\n        minimum\n        maximum\n      }\n      name\n      __typename\n    }\n  }\n'];
+/**
+ * The graphql function is used to parse GraphQL queries into a document that can be used by GraphQL clients.
+ */
+export function graphql(
+  source: '\n    query Pok {\n      pokemons {\n        name\n        maxCP\n        maxHP\n        fleeRate\n      }\n    }\n  '
+): (typeof documents)['\n    query Pok {\n      pokemons {\n        name\n        maxCP\n        maxHP\n        fleeRate\n      }\n    }\n  '];
 
 export function graphql(source: string) {
   return (documents as any)[source] ?? {};

test/e2e/fixture-project-unused-fields/fixtures/gql/graphql.ts

@@ -162,6 +162,19 @@ export type PoQuery = {
     | null;
 };
 
+export type PokQueryVariables = Exact<{ [key: string]: never }>;
+
+export type PokQuery = {
+  __typename?: 'Query';
+  pokemons?: Array<{
+    __typename?: 'Pokemon';
+    name: string;
+    maxCP?: number | null;
+    maxHP?: number | null;
+    fleeRate?: number | null;
+  } | null> | null;
+};
+
 export const PokemonFieldsFragmentDoc = {
   kind: 'Document',
   definitions: [
@@ -338,3 +351,31 @@ export const PoDocument = {
     },
   ],
 } as unknown as DocumentNode<PoQuery, PoQueryVariables>;
+export const PokDocument = {
+  kind: 'Document',
+  definitions: [
+    {
+      kind: 'OperationDefinition',
+      operation: 'query',
+      name: { kind: 'Name', value: 'Pok' },
+      selectionSet: {
+        kind: 'SelectionSet',
+        selections: [
+          {
+            kind: 'Field',
+            name: { kind: 'Name', value: 'pokemons' },
+            selectionSet: {
+              kind: 'SelectionSet',
+              selections: [
+                { kind: 'Field', name: { kind: 'Name', value: 'name' } },
+                { kind: 'Field', name: { kind: 'Name', value: 'maxCP' } },
+                { kind: 'Field', name: { kind: 'Name', value: 'maxHP' } },
+                { kind: 'Field', name: { kind: 'Name', value: 'fleeRate' } },
+              ],
+            },
+          },
+        ],
+      },
+    },
+  ],
+} as unknown as DocumentNode<PokQuery, PokQueryVariables>;

test/e2e/unused-fieds.test.ts

@@ -21,6 +21,7 @@ describe('unused fields', () => {
   );
   const outfileFragment = path.join(projectPath, 'fragment.tsx');
   const outfilePropAccess = path.join(projectPath, 'property-access.tsx');
+  const outfileChainedUsage = path.join(projectPath, 'chained-usage.ts');
 
   let server: TSServer;
   beforeAll(async () => {
@@ -56,6 +57,11 @@ describe('unused fields', () => {
       fileContent: '// empty',
       scriptKindName: 'TS',
     } satisfies ts.server.protocol.OpenRequestArgs);
+    server.sendCommand('open', {
+      file: outfileChainedUsage,
+      fileContent: '// empty',
+      scriptKindName: 'TS',
+    } satisfies ts.server.protocol.OpenRequestArgs);
 
     server.sendCommand('updateOpen', {
       openFiles: [
@@ -101,6 +107,13 @@ describe('unused fields', () => {
             'utf-8'
           ),
         },
+        {
+          file: outfileChainedUsage,
+          fileContent: fs.readFileSync(
+            path.join(projectPath, 'fixtures/chained-usage.ts'),
+            'utf-8'
+          ),
+        },
       ],
     } satisfies ts.server.protocol.UpdateOpenRequestArgs);
 
@@ -128,6 +141,10 @@ describe('unused fields', () => {
       file: outfileBail,
       tmpfile: outfileBail,
     } satisfies ts.server.protocol.SavetoRequestArgs);
+    server.sendCommand('saveto', {
+      file: outfileChainedUsage,
+      tmpfile: outfileChainedUsage,
+    } satisfies ts.server.protocol.SavetoRequestArgs);
   });
 
   afterAll(() => {
@@ -138,6 +155,7 @@ describe('unused fields', () => {
       fs.unlinkSync(outfileFragmentDestructuring);
       fs.unlinkSync(outfileDestructuringFromStart);
       fs.unlinkSync(outfileBail);
+      fs.unlinkSync(outfileChainedUsage);
     } catch {}
   });
 
@@ -405,4 +423,26 @@ describe('unused fields', () => {
       ]
     `);
   }, 30000);
+
+  it('Finds field usage in chained call-expressions', async () => {
+    const res = server.responses.filter(
+      resp =>
+        resp.type === 'event' &&
+        resp.event === 'semanticDiag' &&
+        resp.body?.file === outfileChainedUsage
+    );
+    expect(res[0].body.diagnostics[0]).toEqual({
+      category: 'warning',
+      code: 52005,
+      end: {
+        line: 8,
+        offset: 15,
+      },
+      start: {
+        line: 8,
+        offset: 7,
+      },
+      text: "Field(s) 'pokemons.fleeRate' are not used.",
+    });
+  }, 30000);
 });