Process gitignore-style patterns in files property of package.json

source/lib/rules/files-property.ts

@@ -13,12 +13,15 @@ import {getJSONPropertyPosition} from '../utils';
 export default (context: Context): Diagnostic[] => {
 	const {pkg, typingsFile} = context;
 
-	if (!Array.isArray(pkg.files)) {
+	const packageFiles = pkg.files;
+	if (!Array.isArray(packageFiles)) {
 		return [];
 	}
 
 	const normalizedTypingsFile = path.normalize(typingsFile);
-	const normalizedFiles = globby.sync(pkg.files as string[], {cwd: context.cwd}).map(path.normalize);
+
+	const patternProcessedPackageFiles = processGitIgnoreStylePatterns(packageFiles);
+	const normalizedFiles = globby.sync(patternProcessedPackageFiles, {cwd: context.cwd}).map(path.normalize);
 
 	if (normalizedFiles.includes(normalizedTypingsFile)) {
 		return [];
@@ -36,3 +39,24 @@ export default (context: Context): Diagnostic[] => {
 		}
 	];
 };
+
+function processGitIgnoreStylePatterns(patterns: readonly string[]): string[] {
+	const processedPatterns = patterns
+		.map(pattern => {
+			const [negatePatternMatch] = pattern.match(/^!+/) || [];
+			const negationMarkersCount = negatePatternMatch ? negatePatternMatch.length : 0;
+
+			return [
+				pattern
+					.slice(negationMarkersCount)
+					// Strip off `/` from the start of the pattern
+					.replace(/^\/+/, ''),
+				negationMarkersCount % 2 === 0
+			] as const;
+		})
+		// Only include pattern if it has an even count of negation markers
+		.filter(([, hasEvenCountOfNegationMarkers]) => hasEvenCountOfNegationMarkers)
+		.map(([processedPattern]) => processedPattern);
+
+	return [...new Set(processedPatterns)];
+}

source/test/fixtures/files-gitignore-patterns/negative-pattern-negated/index.js

@@ -0,0 +1,3 @@
+module.exports.default = (foo, bar) => {
+	return foo + bar;
+};

source/test/fixtures/files-gitignore-patterns/negative-pattern-negated/package.json

@@ -0,0 +1,7 @@
+{
+	"name": "foo",
+	"files": [
+		"!!types/index.d.ts"
+	],
+	"types": "types/index.d.ts"
+}

source/test/fixtures/files-gitignore-patterns/negative-pattern-negated/types/index.d.ts

@@ -0,0 +1,6 @@
+declare const concat: {
+	(foo: string, bar: string): string;
+	(foo: number, bar: number): number;
+};
+
+export default concat;

source/test/fixtures/files-gitignore-patterns/negative-pattern-negated/types/index.test-d.ts

@@ -0,0 +1,5 @@
+import {expectType} from '../../../../..';
+import concat from '..';
+
+expectType<string>(concat('foo', 'bar'));
+expectType<number>(concat(1, 2));

source/test/fixtures/files-gitignore-patterns/negative-pattern/index.d.ts

@@ -0,0 +1,6 @@
+declare const concat: {
+	(foo: string, bar: string): string;
+	(foo: number, bar: number): number;
+};
+
+export default concat;

source/test/fixtures/files-gitignore-patterns/negative-pattern/index.js

@@ -0,0 +1,3 @@
+module.exports.default = (foo, bar) => {
+	return foo + bar;
+};

source/test/fixtures/files-gitignore-patterns/negative-pattern/index.test-d.ts

@@ -0,0 +1,5 @@
+import {expectType} from '../../../..';
+import concat from '.';
+
+expectType<string>(concat('foo', 'bar'));
+expectType<number>(concat(1, 2));

source/test/fixtures/files-gitignore-patterns/negative-pattern/package.json

@@ -0,0 +1,6 @@
+{
+	"name": "foo",
+	"files": [
+		"!index.d.ts"
+	]
+}

source/test/fixtures/files-gitignore-patterns/root-marker-pattern/index.js

@@ -0,0 +1,3 @@
+module.exports.default = (foo, bar) => {
+	return foo + bar;
+};

source/test/fixtures/files-gitignore-patterns/root-marker-pattern/package.json

@@ -0,0 +1,7 @@
+{
+	"name": "foo",
+	"files": [
+		"/types/index.d.ts"
+	],
+	"types": "types/index.d.ts"
+}

source/test/fixtures/files-gitignore-patterns/root-marker-pattern/types/index.d.ts

@@ -0,0 +1,6 @@
+declare const concat: {
+	(foo: string, bar: string): string;
+	(foo: number, bar: number): number;
+};
+
+export default concat;

source/test/fixtures/files-gitignore-patterns/root-marker-pattern/types/index.test-d.ts

@@ -0,0 +1,5 @@
+import {expectType} from '../../../../..';
+import concat from '..';
+
+expectType<string>(concat('foo', 'bar'));
+expectType<number>(concat(1, 2));

source/test/test.ts

@@ -45,6 +45,26 @@ test('allow specifying folders containing typings file in `files` list', async t
 	verify(t, diagnostics, []);
 });
 
+test('allow specifying negative gitignore-style patterns in `files` list', async t => {
+	const diagnostics = await tsd({cwd: path.join(__dirname, 'fixtures/files-gitignore-patterns/negative-pattern')});
+
+	verify(t, diagnostics, [
+		[3, 1, 'error', 'TypeScript type definition `index.d.ts` is not part of the `files` list.'],
+	]);
+});
+
+test('allow specifying negated negative (positive) gitignore-style patterns in `files` list', async t => {
+	const diagnostics = await tsd({cwd: path.join(__dirname, 'fixtures/files-gitignore-patterns/negative-pattern-negated')});
+
+	verify(t, diagnostics, []);
+});
+
+test('allow specifying root marker (/) gitignore-style patterns in `files` list', async t => {
+	const diagnostics = await tsd({cwd: path.join(__dirname, 'fixtures/files-gitignore-patterns/root-marker-pattern')});
+
+	verify(t, diagnostics, []);
+});
+
 test('allow specifying glob patterns containing typings file in `files` list', async t => {
 	const diagnostics = await tsd({cwd: path.join(__dirname, 'fixtures/files-glob')});