diff --git a/bin/config-yargs.js b/bin/config-yargs.js
index 5f112db0dfb..a02c774d0d7 100644
--- a/bin/config-yargs.js
+++ b/bin/config-yargs.js
@@ -137,7 +137,7 @@ module.exports = function(yargs) {
 				group: OUTPUT_GROUP
 			},
 			"output-library": {
-				type: "array",
+				type: "string",
 				describe: "Expose the exports of the entry point as library",
 				group: OUTPUT_GROUP,
 				requiresArg: true
diff --git a/bin/convert-argv.js b/bin/convert-argv.js
index b523ad98d05..82fe87a410e 100644
--- a/bin/convert-argv.js
+++ b/bin/convert-argv.js
@@ -441,10 +441,7 @@ module.exports = function(...args) {
 
 		ifArg("output-library", function(value) {
 			ensureObject(options, "output");
-			if (!options.output.library) {
-				options.output.library = [];
-			}
-			options.output.library.push(value);
+			options.output.library = value;
 		});
 
 		ifArg("output-library-target", function(value) {
diff --git a/test/binCases/output/output-library-many/index.js b/test/binCases/output/output-library-many/index.js
deleted file mode 100644
index 0d24e266fe2..00000000000
--- a/test/binCases/output/output-library-many/index.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = "index";
diff --git a/test/binCases/output/output-library-many/stdin.js b/test/binCases/output/output-library-many/stdin.js
deleted file mode 100644
index df5425b6d06..00000000000
--- a/test/binCases/output/output-library-many/stdin.js
+++ /dev/null
@@ -1,12 +0,0 @@
-"use strict";
-
-module.exports = function testAssertions(code, stdout, stderr) {
-	expect(code).toBe(0);
-	expect(stdout).toEqual(expect.anything());
-	expect(stdout[5]).toContain("bundle.js");
-	expect(stdout[7]).toMatch(/index\.js.*\{0\}/);
-	expect(stderr).toHaveLength(0);
-
-	const output = require("fs").readFileSync(require("path").join(__dirname, "../../../js/bin/output/output-library-many/bundle.js"), "utf-8");
-	expect(output).toContain("window.key1=window.key1||{},window.key1.key2=function");
-};
diff --git a/test/binCases/output/output-library-many/test.opts b/test/binCases/output/output-library-many/test.opts
deleted file mode 100644
index 9dc11f5ca63..00000000000
--- a/test/binCases/output/output-library-many/test.opts
+++ /dev/null
@@ -1,5 +0,0 @@
-./index.js
--o ../../../js/bin/output/output-library-many/bundle.js
---target async-node
---output-library-target window
---output-library key1 --output-library key2
diff --git a/test/binCases/output/output-library-single/index.js b/test/binCases/output/output-library-single/index.js
deleted file mode 100644
index 0d24e266fe2..00000000000
--- a/test/binCases/output/output-library-single/index.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = "index";
diff --git a/test/binCases/output/output-library-single/stdin.js b/test/binCases/output/output-library-single/stdin.js
deleted file mode 100644
index 1c3a14167fc..00000000000
--- a/test/binCases/output/output-library-single/stdin.js
+++ /dev/null
@@ -1,12 +0,0 @@
-"use strict";
-
-module.exports = function testAssertions(code, stdout, stderr) {
-	expect(code).toBe(0);
-	expect(stdout).toEqual(expect.anything());
-	expect(stdout[5]).toContain("bundle.js");
-	expect(stdout[7]).toMatch(/index\.js.*\{0\}/);
-	expect(stderr).toHaveLength(0);
-
-	const output = require("fs").readFileSync(require("path").join(__dirname, "../../../js/bin/output/output-library-single/bundle.js"), "utf-8");
-	expect(output).toContain("window.key1=function");
-};
diff --git a/test/binCases/output/output-library-single/test.opts b/test/binCases/output/output-library-single/test.opts
deleted file mode 100644
index df1f1af62a7..00000000000
--- a/test/binCases/output/output-library-single/test.opts
+++ /dev/null
@@ -1,5 +0,0 @@
-./index.js
--o ../../../js/bin/output/output-library-single/bundle.js
---target async-node
---output-library-target window
---output-library key1