internal: use swc with ts-node (graphql#4457)

this currently requires a few changes to c8 control statements to ensure
complete code coverage presumably secondary to a bug/difference between
how tsc and swc handle source mapping

also: use --import with register script instead of --loader to silence
node.js warning regarding --loader

Author: yaacovCR

.mocharc.yml

@@ -4,4 +4,4 @@ check-leaks: true
 extension:
   - ts
 node-option:
-  - 'loader=ts-node/esm/transpile-only'
+  - 'import=./resources/register-ts-node.js'

package-lock.json

@@ -30,10 +30,10 @@
   },
   "scripts": {
     "preversion": "bash -c '. ./resources/checkgit.sh && npm ci --ignore-scripts'",
-    "version": "node --loader ts-node/esm resources/gen-version.ts && npm test && git add src/version.ts",
+    "version": "node --import ./resources/register-ts-node.js  resources/gen-version.ts && npm test && git add src/version.ts",
     "fuzzonly": "mocha --full-trace src/**/__tests__/**/*-fuzz.ts",
-    "changelog": "node --loader ts-node/esm resources/gen-changelog.ts",
-    "benchmark": "node --loader ts-node/esm resources/benchmark.ts",
+    "changelog": "node --import ./resources/register-ts-node.js  resources/gen-changelog.ts",
+    "benchmark": "node --import ./resources/register-ts-node.js  resources/benchmark.ts",
     "test": "npm run lint && npm run check && npm run testonly:cover && npm run prettier:check && npm run check:spelling && npm run check:integrations",
     "lint": "eslint --cache --max-warnings 0 .",
     "check": "tsc --pretty",
@@ -45,14 +45,15 @@
     "precommit": "lint-staged",
     "check:spelling": "cspell --cache --no-progress \"**/*\"",
     "check:integrations": "mocha --full-trace resources/integration-test.ts",
-    "build:npm": "node --loader ts-node/esm resources/build-npm.ts",
-    "build:deno": "node --loader ts-node/esm resources/build-deno.ts",
-    "diff:npm": "node --loader ts-node/esm resources/diff-npm-package.ts",
+    "build:npm": "node --import ./resources/register-ts-node.js  resources/build-npm.ts",
+    "build:deno": "node --import ./resources/register-ts-node.js  resources/build-deno.ts",
+    "diff:npm": "node --import ./resources/register-ts-node.js  resources/diff-npm-package.ts",
     "gitpublish:npm": "bash ./resources/gitpublish.sh npm npmDist",
     "gitpublish:deno": "bash ./resources/gitpublish.sh deno denoDist",
     "prepare": "husky"
   },
   "devDependencies": {
+    "@swc/core": "^1.12.11",
     "@types/chai": "5.0.1",
     "@types/mocha": "10.0.10",
     "@types/node": "22.10.1",

package.json

@@ -0,0 +1,6 @@
+// node.js recommends this instead of using `node --loader ts-node/esm`
+// eslint-disable-next-line n/no-unsupported-features/node-builtins
+import { register } from 'node:module';
+import { pathToFileURL } from 'node:url';
+
+register('ts-node/esm', pathToFileURL('./'));

resources/register-ts-node.js

@@ -1122,8 +1122,10 @@ function completeValue(
       incrementalContext,
       deferMap,
     );
+    // c8 control statement technically placed a line early secondary to
+    // slight swc source mapping error (at least as compared to ts-node without swc)
+    /* c8 ignore next 7 */
   }
-  /* c8 ignore next 6 */
   // Not reachable, all possible output types have been considered.
   invariant(
     false,

src/execution/execute.ts

@@ -240,8 +240,10 @@ export const __Type: GraphQLObjectType = new GraphQLObjectType({
           }
           if (isNonNullType(type)) {
             return TypeKind.NON_NULL;
+            // c8 control statement technically placed a line early secondary to
+            // slight swc source mapping error (at least as compared to ts-node without swc)
+            /* c8 ignore next 4 */
           }
-          /* c8 ignore next 3 */
           // Not reachable, all possible types have been considered)
           invariant(false, `Unexpected type: "${inspect(type)}".`);
         },

src/type/introspection.ts

@@ -137,8 +137,10 @@ export function astFromValue(
     }
 
     throw new TypeError(`Cannot convert value to AST: ${inspect(coerced)}.`);
+    // c8 control statement technically placed a line early secondary to
+    // slight swc source mapping error (at least as compared to ts-node without swc)
+    /* c8 ignore next 4 */
   }
-  /* c8 ignore next 3 */
   // Not reachable, all possible types have been considered.
   invariant(false, 'Unexpected input type: ' + inspect(type));
 }

src/utilities/astFromValue.ts

@@ -715,8 +715,10 @@ function typeKindName(type: GraphQLNamedType): string {
   }
   if (isInputObjectType(type)) {
     return 'an Input type';
+    // c8 control statement technically placed a line early secondary to
+    // slight swc source mapping error (at least as compared to ts-node without swc)
+    /* c8 ignore next 4 */
   }
-  /* c8 ignore next 3 */
   // Not reachable, all possible types have been considered.
   invariant(false, 'Unexpected type: ' + inspect(type));
 }

src/utilities/findSchemaChanges.ts

@@ -280,8 +280,10 @@ export function mapSchemaConfig(
     }
     if (isInputObjectType(type)) {
       return mapInputObjectType(type);
+      // c8 control statement technically placed a line early secondary to
+      // slight swc source mapping error (at least as compared to ts-node without swc)
+      /* c8 ignore next 4 */
     }
-    /* c8 ignore next 3 */
     // Not reachable, all possible type definition nodes have been considered.
     invariant(false, 'Unexpected type: ' + inspect(type));
   }

src/utilities/mapSchemaConfig.ts

@@ -141,8 +141,10 @@ export function printType(type: GraphQLNamedType): string {
   }
   if (isInputObjectType(type)) {
     return printInputObject(type);
+    // c8 control statement technically placed a line early secondary to
+    // slight swc source mapping error (at least as compared to ts-node without swc)
+    /* c8 ignore next 4 */
   }
-  /* c8 ignore next 3 */
   // Not reachable, all possible types have been considered.
   invariant(false, 'Unexpected type: ' + inspect(type));
 }