Support more GraphQL versions (#3)

This PR overhauls the project so that it can support more versions of
GraphQL. It tests it using GraphQL v15, v16 and v17 plus the
semantic-non-null supporting branch `graphql@canary-pr-4192` (from
graphql/graphql-js#4192). It also changes the
logic around applying `@semanticNonNull` to an already non-null field
(in this case, the non-null wins and the semantic is ignored).

Further it exports a new method, `convertFieldConfig`, which can be used
to convert a lone GraphQLFieldConfig object to nullable or strict mode
based on its embedded `@semanticNonNull` directive (via astNode).

Author: benjie

Diff for: .github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [20.x]
+        node-version: [20.x, 22.x]
 
     steps:
       - uses: actions/checkout@v3

Diff for: README.md

@@ -47,6 +47,11 @@ For the directive, the two conversions work like this:
 | semantic-to-nullable | `[Int] @semanticNonNull(levels: [0,1])` | `[Int]`     |
 | semantic-to-strict   | `[Int] @semanticNonNull(levels: [0,1])` | `[Int!]!`   |
 
+> [!NOTE]
+>
+> An existing strictly non-nullable type (`Int!`) will remain unchanged whether
+> or not `@semanticNonNull` applies to that level.
+
 ### `GraphQLSemanticNonNull` wrapper type
 
 How the `GraphQLSemanticNonNull` type is represented syntactically in SDL is yet
@@ -187,3 +192,20 @@ import { schema as sourceSchema } from "./my-schema";
 
 export const schema = semanticToStrict(sourceSchema);
 ```
+
+## Advanced usage
+
+If you just want to convert a single `GraphQLFieldConfig` you can use the
+`convertFieldConfig` method, passing the field config and `true` to convert
+semantic non-null positions to strict non-nulls, or `false` if you want to
+convert to nullable:
+
+```ts
+const strictFieldConfig = convertFieldConfig(fieldConfig, true);
+const nullableFieldConfig = convertFieldConfig(fieldConfig, false);
+```
+
+> [!NOTE]
+>
+> This method assumes that the fieldConfig has come from parsing an SDL string,
+> and thus has an `astNode` that includes a `@semanticNonNull` directive.

Diff for: __tests__/graphql-pr-4192.test.mjs

@@ -0,0 +1,3 @@
+import { runTest } from "./runTest.mjs";
+
+runTest("graphql-pr-4192");

Diff for: __tests__/graphql15.test.mjs

@@ -0,0 +1,3 @@
+import { runTest } from "./runTest.mjs";
+
+runTest("graphql15");

Diff for: __tests__/graphql16.test.mjs

@@ -0,0 +1,3 @@
+import { runTest } from "./runTest.mjs";
+
+runTest("graphql16");

Diff for: __tests__/graphql17.test.mjs

@@ -0,0 +1,3 @@
+import { runTest } from "./runTest.mjs";
+
+runTest("graphql17");

Diff for: __tests__/index.test.mjs

@@ -0,0 +1,68 @@
+// @ts-check
+
+import * as assert from "node:assert";
+import { readdir, readFile } from "node:fs/promises";
+import { test } from "node:test";
+
+const TEST_DIR = import.meta.dirname;
+const files = await readdir(TEST_DIR);
+const skip = test.skip.bind(test);
+
+/** @param graphqlModuleName {string} */
+export const runTest = async (graphqlModuleName) => {
+  test(graphqlModuleName, async (t) => {
+    const mod = await import(graphqlModuleName);
+    const { default: defaultExport, ...namedExports } = mod;
+    const mockGraphql = t.mock.module("graphql", {
+      cache: true,
+      defaultExport,
+      namedExports,
+    });
+    const graphql = await import("graphql");
+    const { buildSchema, printSchema } = graphql;
+    const isSemanticNonNullType = /** @type {any} */ (graphql)
+      .isSemanticNonNullType;
+
+    const { semanticToNullable, semanticToStrict } = await import(
+      `../dist/index.js?graphql=${graphqlModuleName}`
+    );
+
+    for (const file of files) {
+      if (file.endsWith(".test.graphql") && !file.startsWith(".")) {
+        const pureDirective =
+          file === "schema-with-directive-only.test.graphql";
+        const maybeTest =
+          pureDirective || isSemanticNonNullType != null ? test : skip;
+        await maybeTest(file.replace(/\.test\.graphql$/, ""), async () => {
+          const sdl = await readFile(TEST_DIR + "/" + file, "utf8");
+          const schema = buildSchema(sdl);
+          await test("semantic-to-strict", async () => {
+            const expectedSdl = await readFile(
+              TEST_DIR + "/snapshots/" + file.replace(".test.", ".strict."),
+              "utf8",
+            );
+            const converted = semanticToStrict(schema);
+            assert.equal(
+              printSchema(converted).trim(),
+              expectedSdl.trim(),
+              "Expected semantic-to-strict to match",
+            );
+          });
+          await test("semantic-to-nullable", async () => {
+            const expectedSdl = await readFile(
+              TEST_DIR + "/snapshots/" + file.replace(".test.", ".nullable."),
+              "utf8",
+            );
+            const converted = semanticToNullable(schema);
+            assert.equal(
+              printSchema(converted).trim(),
+              expectedSdl.trim(),
+              "Expected semantic-to-nullable to match",
+            );
+          });
+        });
+      }
+    }
+    mockGraphql.restore();
+  });
+};

Diff for: __tests__/runTest.mjs

@@ -0,0 +1,39 @@
+directive @semanticNonNull(levels: [Int!]) on FIELD_DEFINITION
+
+type Query {
+  allThings(includingArchived: Boolean, first: Int!): ThingConnection
+    @semanticNonNull
+}
+
+type ThingConnection {
+  pageInfo: PageInfo!
+  nodes: [Thing] @semanticNonNull(levels: [0, 1])
+}
+
+type PageInfo {
+  startCursor: String @semanticNonNull(levels: [0])
+  endCursor: String @semanticNonNull
+  hasNextPage: Boolean @semanticNonNull
+  hasPreviousPage: Boolean @semanticNonNull
+}
+
+interface Thing {
+  id: ID!
+  name: String @semanticNonNull
+  description: String
+}
+
+type Book implements Thing {
+  id: ID!
+  name: String @semanticNonNull
+  description: String
+  # Test that this non-null is retained
+  pages: Int! @semanticNonNull
+}
+
+type Car implements Thing {
+  id: ID!
+  name: String @semanticNonNull
+  description: String
+  mileage: Float @semanticNonNull
+}

Diff for: __tests__/schema-with-directive-only.test.graphql

@@ -28,7 +28,7 @@ type Book implements Thing {
   # Test that this semantic-non-null doesn't cause issues
   name: String* @semanticNonNull
   description: String
-  # Test that this non-null gets stripped
+  # Test that this non-null is retained
   pages: Int! @semanticNonNull
 }
 

Diff for: __tests__/schema-with-directive.test.graphql

@@ -24,7 +24,7 @@ type Book implements Thing {
   id: ID!
   name: String*
   description: String
-  pages: Int*
+  pages: Int!
 }
 
 type Car implements Thing {

Diff for: __tests__/schema.test.graphql

@@ -0,0 +1,35 @@
+type Query {
+  allThings(includingArchived: Boolean, first: Int!): ThingConnection
+}
+
+type ThingConnection {
+  pageInfo: PageInfo!
+  nodes: [Thing]
+}
+
+type PageInfo {
+  startCursor: String
+  endCursor: String
+  hasNextPage: Boolean
+  hasPreviousPage: Boolean
+}
+
+interface Thing {
+  id: ID!
+  name: String
+  description: String
+}
+
+type Book implements Thing {
+  id: ID!
+  name: String
+  description: String
+  pages: Int!
+}
+
+type Car implements Thing {
+  id: ID!
+  name: String
+  description: String
+  mileage: Float
+}

Diff for: __tests__/snapshots/schema-with-directive-only.nullable.graphql

@@ -0,0 +1,35 @@
+type Query {
+  allThings(includingArchived: Boolean, first: Int!): ThingConnection!
+}
+
+type ThingConnection {
+  pageInfo: PageInfo!
+  nodes: [Thing!]!
+}
+
+type PageInfo {
+  startCursor: String!
+  endCursor: String!
+  hasNextPage: Boolean!
+  hasPreviousPage: Boolean!
+}
+
+interface Thing {
+  id: ID!
+  name: String!
+  description: String
+}
+
+type Book implements Thing {
+  id: ID!
+  name: String!
+  description: String
+  pages: Int!
+}
+
+type Car implements Thing {
+  id: ID!
+  name: String!
+  description: String
+  mileage: Float!
+}

Diff for: __tests__/snapshots/schema-with-directive-only.strict.graphql

@@ -24,7 +24,7 @@ type Book implements Thing {
   id: ID!
   name: String
   description: String
-  pages: Int
+  pages: Int!
 }
 
 type Car implements Thing {

Diff for: __tests__/snapshots/schema-with-directive.nullable.graphql

@@ -24,7 +24,7 @@ type Book implements Thing {
   id: ID!
   name: String
   description: String
-  pages: Int
+  pages: Int!
 }
 
 type Car implements Thing {

Diff for: __tests__/snapshots/schema.nullable.graphql

@@ -9,7 +9,7 @@
   },
   "scripts": {
     "prepack": "tsc && chmod +x dist/cli/*.js",
-    "test": "node --test",
+    "test": "node --test --experimental-test-module-mocks",
     "watch": "tsc --watch",
     "lint": "yarn prettier:check && eslint --ext .js,.jsx,.ts,.tsx,.graphql .",
     "lint:fix": "eslint --ext .js,.jsx,.ts,.tsx,.graphql . --fix; prettier --cache --ignore-path .eslintignore --write '**/*.{js,jsx,ts,tsx,graphql,md,json}'",
@@ -46,7 +46,7 @@
   "author": "Benjie Gillam <[email protected]>",
   "license": "MIT",
   "dependencies": {
-    "graphql": "16.9.0-canary.pr.4192.1813397076f44a55e5798478e7321db9877de97a"
+    "graphql": "15.x | 16.x | 17.x"
   },
   "devDependencies": {
     "@tsconfig/recommended": "^1.0.7",
@@ -58,6 +58,10 @@
     "eslint-plugin-import": "^2.28.1",
     "eslint-plugin-simple-import-sort": "^10.0.0",
     "eslint_d": "^13.0.0",
+    "graphql-pr-4192": "npm:graphql@16.9.0-canary.pr.4192.1813397076f44a55e5798478e7321db9877de97a",
+    "graphql15": "npm:[email protected]",
+    "graphql16": "npm:[email protected]",
+    "graphql17": "npm:[email protected]",
     "prettier": "^3.3.3",
     "typescript": "^5.6.2"
   },