Migrate all tests code to TypeScript

.eslintrc.yml

@@ -632,12 +632,25 @@ overrides:
       '@typescript-eslint/type-annotation-spacing': off
   - files: '**/__*__/**'
     rules:
+      '@typescript-eslint/consistent-type-assertions':
+        [error, { assertionStyle: as, objectLiteralTypeAssertions: allow }]
+      '@typescript-eslint/no-non-null-assertion': off
+      '@typescript-eslint/restrict-plus-operands': off
+      '@typescript-eslint/no-floating-promises': off
+      '@typescript-eslint/no-invalid-this': off
+      '@typescript-eslint/no-throw-literal': off
+      '@typescript-eslint/require-await': off
+      '@typescript-eslint/await-thenable': off
+      'prefer-promise-reject-errors': 0
+      'no-new-wrappers': 0
+      'no-throw-literal': 0
       node/no-unpublished-import: off
       node/no-unpublished-require: off
       import/no-restricted-paths: off
       import/no-extraneous-dependencies: [error, { devDependencies: true }]
       import/no-nodejs-modules: off
       no-restricted-syntax: off
+      flowtype/type-import-style: off
   - files: 'resources/**'
     parserOptions:
       sourceType: script

.flowconfig

@@ -36,7 +36,6 @@ module.use_strict=true
 babel_loose_array_spread=true
 esproposal.optional_chaining=enable
 suppress_comment=\\(.\\|\n\\)*\\$FlowFixMe\\($\\|[^(]\\|(\\(<VERSION>\\)?)\\)
-suppress_comment=\\(.\\|\n\\)*\\$DisableFlowOnNegativeTest
 
 [version]
 ^0.126.0

.mocharc.yml

@@ -2,3 +2,4 @@ throw-deprecation: true
 check-leaks: true
 require:
   - '@babel/register'
+  - ts-node/register

cspell.json

@@ -18,6 +18,9 @@
     "Alderaan",
     "Tatooine",
     "astromech",
+    "structs",
+    "geocode",
+    "behaviour",
 
     // TODO: remove bellow words
     "Graphi", // GraphiQL

package.json

@@ -26,8 +26,8 @@
   "scripts": {
     "test": "npm run prettier:check && npm run lint && npm run check && npm run testonly && npm run check:ts && npm run check:spelling",
     "test:ci": "npm run prettier:check && npm run lint -- --no-cache && npm run check && npm run testonly:cover && npm run check:ts && npm run check:spelling && npm run build",
-    "fuzzonly": "mocha --full-trace src/**/__tests__/**/*-fuzz.js",
-    "testonly": "mocha --full-trace src/**/__tests__/**/*-test.js",
+    "fuzzonly": "mocha --full-trace src/**/__tests__/**/*-fuzz.ts",
+    "testonly": "mocha --full-trace src/**/__tests__/**/*-test.ts",
     "testonly:cover": "nyc npm run testonly",
     "lint": "eslint --cache --ext .js,.ts src resources",
     "benchmark": "node --noconcurrent_sweeping --expose-gc --predictable ./resources/benchmark.js",
@@ -46,6 +46,9 @@
   "dependencies": {},
   "devDependencies": {
     "@babel/core": "7.10.2",
+    "@types/node": "14.0.9",
+    "@types/mocha": "7.0.2",
+    "@types/chai": "4.2.11",
     "@babel/plugin-transform-flow-strip-types": "7.10.1",
     "@babel/preset-env": "7.10.2",
     "@babel/register": "7.10.1",
@@ -65,6 +68,7 @@
     "mocha": "7.2.0",
     "nyc": "15.1.0",
     "prettier": "2.0.5",
+    "ts-node": "8.10.2",
     "typescript": "3.9.3"
   }
 }

src/__fixtures__/index.d.ts

@@ -0,0 +1,4 @@
+export declare const bigSchemaSDL: string;
+export declare const bigSchemaIntrospectionResult: Record<string, any>;
+export declare const kitchenSinkSDL: string;
+export declare const kitchenSinkQuery: string;

src/__fixtures__/index.js

@@ -1,18 +1,21 @@
+/* eslint-disable import/no-commonjs */
 // @flow strict
 
-import { join } from 'path';
-import { readFileSync } from 'fs';
+// FIXME: This file should remain as JS file, and has a supporting `d.ts` file,
+// because it's in use by other areas of that repo (like benchmark tests).
+// I should be converted to `.ts` after migrating the entire build system to TS.
 
-function readLocalFile(filename: string): string {
+const { join } = require('path');
+const { readFileSync } = require('fs');
+
+function readLocalFile(filename) {
   return readFileSync(join(__dirname, filename), 'utf8');
 }
 
-export const bigSchemaSDL: string = readLocalFile('github-schema.graphql');
-export const bigSchemaIntrospectionResult: any = JSON.parse(
+export const bigSchemaSDL = readLocalFile('github-schema.graphql');
+export const bigSchemaIntrospectionResult = JSON.parse(
   readLocalFile('github-schema.json'),
 );
 
-export const kitchenSinkSDL: string = readLocalFile(
-  'schema-kitchen-sink.graphql',
-);
-export const kitchenSinkQuery: string = readLocalFile('kitchen-sink.graphql');
+export const kitchenSinkSDL = readLocalFile('schema-kitchen-sink.graphql');
+export const kitchenSinkQuery = readLocalFile('kitchen-sink.graphql');

src/__testUtils__/__tests__/dedent-test.js → src/__testUtils__/__tests__/dedent-test.ts

@@ -1,5 +1,3 @@
-// @flow strict
-
 import { expect } from 'chai';
 import { describe, it } from 'mocha';
 

src/__testUtils__/__tests__/genFuzzStrings-test.js → src/__testUtils__/__tests__/genFuzzStrings-test.ts

@@ -1,11 +1,12 @@
-// @flow strict
-
 import { expect } from 'chai';
 import { describe, it } from 'mocha';
 
 import genFuzzStrings from '../genFuzzStrings';
 
-function expectFuzzStrings(options) {
+function expectFuzzStrings(options: {
+  allowedChars: Array<string>;
+  maxLength: number;
+}) {
   return expect(Array.from(genFuzzStrings(options)));
 }
 

src/__testUtils__/__tests__/inspectStr-test.js → src/__testUtils__/__tests__/inspectStr-test.ts

@@ -1,5 +1,3 @@
-// @flow strict
-
 import { expect } from 'chai';
 import { describe, it } from 'mocha';
 

src/__testUtils__/dedent.js → src/__testUtils__/dedent.ts

@@ -1,5 +1,3 @@
-// @flow strict
-
 /**
  * An ES6 string tag that fixes indentation. Also removes leading newlines
  * and trailing spaces and tabs, but keeps trailing newlines.
@@ -13,8 +11,8 @@
  * str === "{\n  test\n}\n";
  */
 export default function dedent(
-  strings: $ReadOnlyArray<string>,
-  ...values: $ReadOnlyArray<string>
+  strings: string | ReadonlyArray<string>,
+  ...values: ReadonlyArray<string>
 ): string {
   let str = '';
 

src/__testUtils__/genFuzzStrings.js → src/__testUtils__/genFuzzStrings.ts

@@ -1,12 +1,10 @@
-// @flow strict
-
 /**
  * Generator that produces all possible combinations of allowed characters.
  */
-export default function* genFuzzStrings(options: {|
-  allowedChars: Array<string>,
-  maxLength: number,
-|}): Generator<string, void, void> {
+export default function* genFuzzStrings(options: {
+  allowedChars: Array<string>;
+  maxLength: number;
+}): Generator<string, void, void> {
   const { allowedChars, maxLength } = options;
   const numAllowedChars = allowedChars.length;
 

src/__testUtils__/inspectStr.js → src/__testUtils__/inspectStr.ts

@@ -1,9 +1,9 @@
-// @flow strict
+import { Maybe } from '../jsutils/Maybe';
 
 /**
  * Special inspect function to produce readable string literal for error messages in tests
  */
-export default function inspectStr(str: ?string): string {
+export default function inspectStr(str: Maybe<string>): string {
   if (str == null) {
     return 'null';
   }