diff --git a/src/compiler/commandLineParser.ts b/src/compiler/commandLineParser.ts
index 5f01e66e07325..ec34adc1d2a26 100644
--- a/src/compiler/commandLineParser.ts
+++ b/src/compiler/commandLineParser.ts
@@ -38,12 +38,13 @@ namespace ts {
         ["es2017.string", "lib.es2017.string.d.ts"],
         ["es2017.intl", "lib.es2017.intl.d.ts"],
         ["es2017.typedarrays", "lib.es2017.typedarrays.d.ts"],
+        ["es2018.asynciterable", "lib.es2018.asynciterable.d.ts"],
         ["es2018.intl", "lib.es2018.intl.d.ts"],
         ["es2018.promise", "lib.es2018.promise.d.ts"],
         ["es2018.regexp", "lib.es2018.regexp.d.ts"],
         ["esnext.array", "lib.esnext.array.d.ts"],
         ["esnext.symbol", "lib.esnext.symbol.d.ts"],
-        ["esnext.asynciterable", "lib.esnext.asynciterable.d.ts"],
+        ["esnext.asynciterable", "lib.es2018.asynciterable.d.ts"],
         ["esnext.intl", "lib.esnext.intl.d.ts"],
         ["esnext.bigint", "lib.esnext.bigint.d.ts"]
     ];
diff --git a/src/lib/esnext.asynciterable.d.ts b/src/lib/es2018.asynciterable.d.ts
similarity index 100%
rename from src/lib/esnext.asynciterable.d.ts
rename to src/lib/es2018.asynciterable.d.ts
diff --git a/src/lib/es2018.d.ts b/src/lib/es2018.d.ts
index 1d0e0c94d2c3a..2a20887b3ee22 100644
--- a/src/lib/es2018.d.ts
+++ b/src/lib/es2018.d.ts
@@ -1,4 +1,5 @@
 /// <reference lib="es2017" />
+/// <reference lib="es2018.asynciterable" />
 /// <reference lib="es2018.promise" />
 /// <reference lib="es2018.regexp" />
 /// <reference lib="es2018.intl" />
diff --git a/src/lib/esnext.d.ts b/src/lib/esnext.d.ts
index 45d7e1d96c9cf..4f3045706b605 100644
--- a/src/lib/esnext.d.ts
+++ b/src/lib/esnext.d.ts
@@ -1,5 +1,4 @@
 /// <reference lib="es2018" />
-/// <reference lib="esnext.asynciterable" />
 /// <reference lib="esnext.array" />
 /// <reference lib="esnext.bigint" />
 /// <reference lib="esnext.symbol" />
diff --git a/src/lib/libs.json b/src/lib/libs.json
index 3077181af6eeb..95ae5e81a6a7b 100644
--- a/src/lib/libs.json
+++ b/src/lib/libs.json
@@ -29,10 +29,10 @@
         "es2017.string",
         "es2017.intl",
         "es2017.typedarrays",
+        "es2018.asynciterable",
         "es2018.regexp",
         "es2018.promise",
         "es2018.intl",
-        "esnext.asynciterable",
         "esnext.array",
         "esnext.bigint",
         "esnext.symbol",
diff --git a/src/testRunner/unittests/config/commandLineParsing.ts b/src/testRunner/unittests/config/commandLineParsing.ts
index 25fa3a45050f3..a97784cb32148 100644
--- a/src/testRunner/unittests/config/commandLineParsing.ts
+++ b/src/testRunner/unittests/config/commandLineParsing.ts
@@ -57,7 +57,7 @@ namespace ts {
             assertParseResult(["--lib", "es5,invalidOption", "0.ts"],
                 {
                     errors: [{
-                        messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'esnext.array', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.bigint'.",
+                        messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'esnext.array', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.bigint'.",
                         category: Diagnostics.Argument_for_0_option_must_be_Colon_1.category,
                         code: Diagnostics.Argument_for_0_option_must_be_Colon_1.code,
                         file: undefined,
@@ -259,7 +259,7 @@ namespace ts {
             assertParseResult(["--lib", "es5,", "es7", "0.ts"],
                 {
                     errors: [{
-                        messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'esnext.array', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.bigint'.",
+                        messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'esnext.array', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.bigint'.",
                         category: Diagnostics.Argument_for_0_option_must_be_Colon_1.category,
                         code: Diagnostics.Argument_for_0_option_must_be_Colon_1.code,
                         file: undefined,
@@ -278,7 +278,7 @@ namespace ts {
             assertParseResult(["--lib", "es5, ", "es7", "0.ts"],
                 {
                     errors: [{
-                        messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'esnext.array', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.bigint'.",
+                        messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'esnext.array', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.bigint'.",
                         category: Diagnostics.Argument_for_0_option_must_be_Colon_1.category,
                         code: Diagnostics.Argument_for_0_option_must_be_Colon_1.code,
                         file: undefined,
diff --git a/src/testRunner/unittests/config/convertCompilerOptionsFromJson.ts b/src/testRunner/unittests/config/convertCompilerOptionsFromJson.ts
index 318bc0ceb2627..9f108676abb57 100644
--- a/src/testRunner/unittests/config/convertCompilerOptionsFromJson.ts
+++ b/src/testRunner/unittests/config/convertCompilerOptionsFromJson.ts
@@ -295,7 +295,7 @@ namespace ts {
                         file: undefined,
                         start: 0,
                         length: 0,
-                        messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'esnext.array', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.bigint'.",
+                        messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'esnext.array', 'esnext.symbol', 'esnext.intl', 'esnext.bigint'.",
                         code: Diagnostics.Argument_for_0_option_must_be_Colon_1.code,
                         category: Diagnostics.Argument_for_0_option_must_be_Colon_1.category
                     }]
@@ -326,7 +326,7 @@ namespace ts {
                         file: undefined,
                         start: 0,
                         length: 0,
-                        messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'esnext.array', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.bigint'.",
+                        messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'esnext.array', 'esnext.symbol', 'esnext.intl', 'esnext.bigint'.",
                         code: Diagnostics.Argument_for_0_option_must_be_Colon_1.code,
                         category: Diagnostics.Argument_for_0_option_must_be_Colon_1.category
                     }]
@@ -357,7 +357,7 @@ namespace ts {
                         file: undefined,
                         start: 0,
                         length: 0,
-                        messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'esnext.array', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.bigint'.",
+                        messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'esnext.array', 'esnext.symbol', 'esnext.intl', 'esnext.bigint'.",
                         code: Diagnostics.Argument_for_0_option_must_be_Colon_1.code,
                         category: Diagnostics.Argument_for_0_option_must_be_Colon_1.category
                     }]
@@ -388,7 +388,7 @@ namespace ts {
                         file: undefined,
                         start: 0,
                         length: 0,
-                        messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'esnext.array', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.bigint'.",
+                        messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'esnext.array', 'esnext.symbol', 'esnext.intl', 'esnext.bigint'.",
                         code: Diagnostics.Argument_for_0_option_must_be_Colon_1.code,
                         category: Diagnostics.Argument_for_0_option_must_be_Colon_1.category
                     }]
diff --git a/tests/baselines/reference/forAwaitForUnion.symbols b/tests/baselines/reference/forAwaitForUnion.symbols
index 386cc725a12aa..bc606082a7640 100644
--- a/tests/baselines/reference/forAwaitForUnion.symbols
+++ b/tests/baselines/reference/forAwaitForUnion.symbols
@@ -5,7 +5,7 @@ async function f<T>(source: Iterable<T> | AsyncIterable<T>) {
 >source : Symbol(source, Decl(forAwaitForUnion.ts, 0, 20))
 >Iterable : Symbol(Iterable, Decl(lib.es2015.iterable.d.ts, --, --))
 >T : Symbol(T, Decl(forAwaitForUnion.ts, 0, 17))
->AsyncIterable : Symbol(AsyncIterable, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterable : Symbol(AsyncIterable, Decl(lib.es2018.asynciterable.d.ts, --, --))
 >T : Symbol(T, Decl(forAwaitForUnion.ts, 0, 17))
 
     for await (const x of source) {
diff --git a/tests/baselines/reference/types.asyncGenerators.es2018.1.symbols b/tests/baselines/reference/types.asyncGenerators.es2018.1.symbols
index 27b21d4810f5e..3a0e33ce1b1d1 100644
--- a/tests/baselines/reference/types.asyncGenerators.es2018.1.symbols
+++ b/tests/baselines/reference/types.asyncGenerators.es2018.1.symbols
@@ -49,13 +49,13 @@ async function * inferReturnType8() {
 }
 const assignability1: () => AsyncIterableIterator<number> = async function * () {
 >assignability1 : Symbol(assignability1, Decl(types.asyncGenerators.es2018.1.ts, 24, 5))
->AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield 1;
 };
 const assignability2: () => AsyncIterableIterator<number> = async function * () {
 >assignability2 : Symbol(assignability2, Decl(types.asyncGenerators.es2018.1.ts, 27, 5))
->AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield Promise.resolve(1);
 >Promise.resolve : Symbol(PromiseConstructor.resolve, Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --))
@@ -65,13 +65,13 @@ const assignability2: () => AsyncIterableIterator<number> = async function * ()
 };
 const assignability3: () => AsyncIterableIterator<number> = async function * () {
 >assignability3 : Symbol(assignability3, Decl(types.asyncGenerators.es2018.1.ts, 30, 5))
->AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* [1, 2];
 };
 const assignability4: () => AsyncIterableIterator<number> = async function * () {
 >assignability4 : Symbol(assignability4, Decl(types.asyncGenerators.es2018.1.ts, 33, 5))
->AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* [Promise.resolve(1)];
 >Promise.resolve : Symbol(PromiseConstructor.resolve, Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --))
@@ -81,19 +81,19 @@ const assignability4: () => AsyncIterableIterator<number> = async function * ()
 };
 const assignability5: () => AsyncIterableIterator<number> = async function * () {
 >assignability5 : Symbol(assignability5, Decl(types.asyncGenerators.es2018.1.ts, 36, 5))
->AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* (async function * () { yield 1; })();
 };
 const assignability6: () => AsyncIterable<number> = async function * () {
 >assignability6 : Symbol(assignability6, Decl(types.asyncGenerators.es2018.1.ts, 39, 5))
->AsyncIterable : Symbol(AsyncIterable, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterable : Symbol(AsyncIterable, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield 1;
 };
 const assignability7: () => AsyncIterable<number> = async function * () {
 >assignability7 : Symbol(assignability7, Decl(types.asyncGenerators.es2018.1.ts, 42, 5))
->AsyncIterable : Symbol(AsyncIterable, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterable : Symbol(AsyncIterable, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield Promise.resolve(1);
 >Promise.resolve : Symbol(PromiseConstructor.resolve, Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --))
@@ -103,13 +103,13 @@ const assignability7: () => AsyncIterable<number> = async function * () {
 };
 const assignability8: () => AsyncIterable<number> = async function * () {
 >assignability8 : Symbol(assignability8, Decl(types.asyncGenerators.es2018.1.ts, 45, 5))
->AsyncIterable : Symbol(AsyncIterable, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterable : Symbol(AsyncIterable, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* [1, 2];
 };
 const assignability9: () => AsyncIterable<number> = async function * () {
 >assignability9 : Symbol(assignability9, Decl(types.asyncGenerators.es2018.1.ts, 48, 5))
->AsyncIterable : Symbol(AsyncIterable, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterable : Symbol(AsyncIterable, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* [Promise.resolve(1)];
 >Promise.resolve : Symbol(PromiseConstructor.resolve, Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --))
@@ -119,19 +119,19 @@ const assignability9: () => AsyncIterable<number> = async function * () {
 };
 const assignability10: () => AsyncIterable<number> = async function * () {
 >assignability10 : Symbol(assignability10, Decl(types.asyncGenerators.es2018.1.ts, 51, 5))
->AsyncIterable : Symbol(AsyncIterable, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterable : Symbol(AsyncIterable, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* (async function * () { yield 1; })();
 };
 const assignability11: () => AsyncIterator<number> = async function * () {
 >assignability11 : Symbol(assignability11, Decl(types.asyncGenerators.es2018.1.ts, 54, 5))
->AsyncIterator : Symbol(AsyncIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterator : Symbol(AsyncIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield 1;
 };
 const assignability12: () => AsyncIterator<number> = async function * () {
 >assignability12 : Symbol(assignability12, Decl(types.asyncGenerators.es2018.1.ts, 57, 5))
->AsyncIterator : Symbol(AsyncIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterator : Symbol(AsyncIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield Promise.resolve(1);
 >Promise.resolve : Symbol(PromiseConstructor.resolve, Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --))
@@ -141,13 +141,13 @@ const assignability12: () => AsyncIterator<number> = async function * () {
 };
 const assignability13: () => AsyncIterator<number> = async function * () {
 >assignability13 : Symbol(assignability13, Decl(types.asyncGenerators.es2018.1.ts, 60, 5))
->AsyncIterator : Symbol(AsyncIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterator : Symbol(AsyncIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* [1, 2];
 };
 const assignability14: () => AsyncIterator<number> = async function * () {
 >assignability14 : Symbol(assignability14, Decl(types.asyncGenerators.es2018.1.ts, 63, 5))
->AsyncIterator : Symbol(AsyncIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterator : Symbol(AsyncIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* [Promise.resolve(1)];
 >Promise.resolve : Symbol(PromiseConstructor.resolve, Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --))
@@ -157,19 +157,19 @@ const assignability14: () => AsyncIterator<number> = async function * () {
 };
 const assignability15: () => AsyncIterator<number> = async function * () {
 >assignability15 : Symbol(assignability15, Decl(types.asyncGenerators.es2018.1.ts, 66, 5))
->AsyncIterator : Symbol(AsyncIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterator : Symbol(AsyncIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* (async function * () { yield 1; })();
 };
 async function * explicitReturnType1(): AsyncIterableIterator<number> {
 >explicitReturnType1 : Symbol(explicitReturnType1, Decl(types.asyncGenerators.es2018.1.ts, 68, 2))
->AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield 1;
 }
 async function * explicitReturnType2(): AsyncIterableIterator<number> {
 >explicitReturnType2 : Symbol(explicitReturnType2, Decl(types.asyncGenerators.es2018.1.ts, 71, 1))
->AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield Promise.resolve(1);
 >Promise.resolve : Symbol(PromiseConstructor.resolve, Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --))
@@ -178,13 +178,13 @@ async function * explicitReturnType2(): AsyncIterableIterator<number> {
 }
 async function * explicitReturnType3(): AsyncIterableIterator<number> {
 >explicitReturnType3 : Symbol(explicitReturnType3, Decl(types.asyncGenerators.es2018.1.ts, 74, 1))
->AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* [1, 2];
 }
 async function * explicitReturnType4(): AsyncIterableIterator<number> {
 >explicitReturnType4 : Symbol(explicitReturnType4, Decl(types.asyncGenerators.es2018.1.ts, 77, 1))
->AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* [Promise.resolve(1)];
 >Promise.resolve : Symbol(PromiseConstructor.resolve, Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --))
@@ -193,19 +193,19 @@ async function * explicitReturnType4(): AsyncIterableIterator<number> {
 }
 async function * explicitReturnType5(): AsyncIterableIterator<number> {
 >explicitReturnType5 : Symbol(explicitReturnType5, Decl(types.asyncGenerators.es2018.1.ts, 80, 1))
->AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* (async function * () { yield 1; })();
 }
 async function * explicitReturnType6(): AsyncIterable<number> {
 >explicitReturnType6 : Symbol(explicitReturnType6, Decl(types.asyncGenerators.es2018.1.ts, 83, 1))
->AsyncIterable : Symbol(AsyncIterable, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterable : Symbol(AsyncIterable, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield 1;
 }
 async function * explicitReturnType7(): AsyncIterable<number> {
 >explicitReturnType7 : Symbol(explicitReturnType7, Decl(types.asyncGenerators.es2018.1.ts, 86, 1))
->AsyncIterable : Symbol(AsyncIterable, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterable : Symbol(AsyncIterable, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield Promise.resolve(1);
 >Promise.resolve : Symbol(PromiseConstructor.resolve, Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --))
@@ -214,13 +214,13 @@ async function * explicitReturnType7(): AsyncIterable<number> {
 }
 async function * explicitReturnType8(): AsyncIterable<number> {
 >explicitReturnType8 : Symbol(explicitReturnType8, Decl(types.asyncGenerators.es2018.1.ts, 89, 1))
->AsyncIterable : Symbol(AsyncIterable, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterable : Symbol(AsyncIterable, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* [1, 2];
 }
 async function * explicitReturnType9(): AsyncIterable<number> {
 >explicitReturnType9 : Symbol(explicitReturnType9, Decl(types.asyncGenerators.es2018.1.ts, 92, 1))
->AsyncIterable : Symbol(AsyncIterable, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterable : Symbol(AsyncIterable, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* [Promise.resolve(1)];
 >Promise.resolve : Symbol(PromiseConstructor.resolve, Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --))
@@ -229,19 +229,19 @@ async function * explicitReturnType9(): AsyncIterable<number> {
 }
 async function * explicitReturnType10(): AsyncIterable<number> {
 >explicitReturnType10 : Symbol(explicitReturnType10, Decl(types.asyncGenerators.es2018.1.ts, 95, 1))
->AsyncIterable : Symbol(AsyncIterable, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterable : Symbol(AsyncIterable, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* (async function * () { yield 1; })();
 }
 async function * explicitReturnType11(): AsyncIterator<number> {
 >explicitReturnType11 : Symbol(explicitReturnType11, Decl(types.asyncGenerators.es2018.1.ts, 98, 1))
->AsyncIterator : Symbol(AsyncIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterator : Symbol(AsyncIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield 1;
 }
 async function * explicitReturnType12(): AsyncIterator<number> {
 >explicitReturnType12 : Symbol(explicitReturnType12, Decl(types.asyncGenerators.es2018.1.ts, 101, 1))
->AsyncIterator : Symbol(AsyncIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterator : Symbol(AsyncIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield Promise.resolve(1);
 >Promise.resolve : Symbol(PromiseConstructor.resolve, Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --))
@@ -250,13 +250,13 @@ async function * explicitReturnType12(): AsyncIterator<number> {
 }
 async function * explicitReturnType13(): AsyncIterator<number> {
 >explicitReturnType13 : Symbol(explicitReturnType13, Decl(types.asyncGenerators.es2018.1.ts, 104, 1))
->AsyncIterator : Symbol(AsyncIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterator : Symbol(AsyncIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* [1, 2];
 }
 async function * explicitReturnType14(): AsyncIterator<number> {
 >explicitReturnType14 : Symbol(explicitReturnType14, Decl(types.asyncGenerators.es2018.1.ts, 107, 1))
->AsyncIterator : Symbol(AsyncIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterator : Symbol(AsyncIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* [Promise.resolve(1)];
 >Promise.resolve : Symbol(PromiseConstructor.resolve, Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --))
@@ -265,7 +265,7 @@ async function * explicitReturnType14(): AsyncIterator<number> {
 }
 async function * explicitReturnType15(): AsyncIterator<number> {
 >explicitReturnType15 : Symbol(explicitReturnType15, Decl(types.asyncGenerators.es2018.1.ts, 110, 1))
->AsyncIterator : Symbol(AsyncIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterator : Symbol(AsyncIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* (async function * () { yield 1; })();
 }
diff --git a/tests/baselines/reference/types.asyncGenerators.es2018.2.symbols b/tests/baselines/reference/types.asyncGenerators.es2018.2.symbols
index 704aefcb42cee..830a4774131d7 100644
--- a/tests/baselines/reference/types.asyncGenerators.es2018.2.symbols
+++ b/tests/baselines/reference/types.asyncGenerators.es2018.2.symbols
@@ -20,109 +20,109 @@ async function * inferReturnType3() {
 }
 const assignability1: () => AsyncIterableIterator<number> = async function * () {
 >assignability1 : Symbol(assignability1, Decl(types.asyncGenerators.es2018.2.ts, 9, 5))
->AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield "a";
 };
 const assignability2: () => AsyncIterableIterator<number> = async function * () {
 >assignability2 : Symbol(assignability2, Decl(types.asyncGenerators.es2018.2.ts, 12, 5))
->AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* ["a", "b"];
 };
 const assignability3: () => AsyncIterableIterator<number> = async function * () {
 >assignability3 : Symbol(assignability3, Decl(types.asyncGenerators.es2018.2.ts, 15, 5))
->AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* (async function * () { yield "a"; })();
 };
 const assignability4: () => AsyncIterable<number> = async function * () {
 >assignability4 : Symbol(assignability4, Decl(types.asyncGenerators.es2018.2.ts, 18, 5))
->AsyncIterable : Symbol(AsyncIterable, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterable : Symbol(AsyncIterable, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield "a";
 };
 const assignability5: () => AsyncIterable<number> = async function * () {
 >assignability5 : Symbol(assignability5, Decl(types.asyncGenerators.es2018.2.ts, 21, 5))
->AsyncIterable : Symbol(AsyncIterable, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterable : Symbol(AsyncIterable, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* ["a", "b"];
 };
 const assignability6: () => AsyncIterable<number> = async function * () {
 >assignability6 : Symbol(assignability6, Decl(types.asyncGenerators.es2018.2.ts, 24, 5))
->AsyncIterable : Symbol(AsyncIterable, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterable : Symbol(AsyncIterable, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* (async function * () { yield "a"; })();
 };
 const assignability7: () => AsyncIterator<number> = async function * () {
 >assignability7 : Symbol(assignability7, Decl(types.asyncGenerators.es2018.2.ts, 27, 5))
->AsyncIterator : Symbol(AsyncIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterator : Symbol(AsyncIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield "a";
 };
 const assignability8: () => AsyncIterator<number> = async function * () {
 >assignability8 : Symbol(assignability8, Decl(types.asyncGenerators.es2018.2.ts, 30, 5))
->AsyncIterator : Symbol(AsyncIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterator : Symbol(AsyncIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* ["a", "b"];
 };
 const assignability9: () => AsyncIterator<number> = async function * () {
 >assignability9 : Symbol(assignability9, Decl(types.asyncGenerators.es2018.2.ts, 33, 5))
->AsyncIterator : Symbol(AsyncIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterator : Symbol(AsyncIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* (async function * () { yield "a"; })();
 };
 async function * explicitReturnType1(): AsyncIterableIterator<number> {
 >explicitReturnType1 : Symbol(explicitReturnType1, Decl(types.asyncGenerators.es2018.2.ts, 35, 2))
->AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield "a";
 }
 async function * explicitReturnType2(): AsyncIterableIterator<number> {
 >explicitReturnType2 : Symbol(explicitReturnType2, Decl(types.asyncGenerators.es2018.2.ts, 38, 1))
->AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* ["a", "b"];
 }
 async function * explicitReturnType3(): AsyncIterableIterator<number> {
 >explicitReturnType3 : Symbol(explicitReturnType3, Decl(types.asyncGenerators.es2018.2.ts, 41, 1))
->AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* (async function * () { yield "a"; })();
 }
 async function * explicitReturnType4(): AsyncIterable<number> {
 >explicitReturnType4 : Symbol(explicitReturnType4, Decl(types.asyncGenerators.es2018.2.ts, 44, 1))
->AsyncIterable : Symbol(AsyncIterable, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterable : Symbol(AsyncIterable, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield "a";
 }
 async function * explicitReturnType5(): AsyncIterable<number> {
 >explicitReturnType5 : Symbol(explicitReturnType5, Decl(types.asyncGenerators.es2018.2.ts, 47, 1))
->AsyncIterable : Symbol(AsyncIterable, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterable : Symbol(AsyncIterable, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* ["a", "b"];
 }
 async function * explicitReturnType6(): AsyncIterable<number> {
 >explicitReturnType6 : Symbol(explicitReturnType6, Decl(types.asyncGenerators.es2018.2.ts, 50, 1))
->AsyncIterable : Symbol(AsyncIterable, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterable : Symbol(AsyncIterable, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* (async function * () { yield "a"; })();
 }
 async function * explicitReturnType7(): AsyncIterator<number> {
 >explicitReturnType7 : Symbol(explicitReturnType7, Decl(types.asyncGenerators.es2018.2.ts, 53, 1))
->AsyncIterator : Symbol(AsyncIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterator : Symbol(AsyncIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield "a";
 }
 async function * explicitReturnType8(): AsyncIterator<number> {
 >explicitReturnType8 : Symbol(explicitReturnType8, Decl(types.asyncGenerators.es2018.2.ts, 56, 1))
->AsyncIterator : Symbol(AsyncIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterator : Symbol(AsyncIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* ["a", "b"];
 }
 async function * explicitReturnType9(): AsyncIterator<number> {
 >explicitReturnType9 : Symbol(explicitReturnType9, Decl(types.asyncGenerators.es2018.2.ts, 59, 1))
->AsyncIterator : Symbol(AsyncIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterator : Symbol(AsyncIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
     yield* (async function * () { yield "a"; })();
 }
diff --git a/tests/baselines/reference/types.forAwait.es2018.1.symbols b/tests/baselines/reference/types.forAwait.es2018.1.symbols
index a84297ae62a0c..e713cd86662c1 100644
--- a/tests/baselines/reference/types.forAwait.es2018.1.symbols
+++ b/tests/baselines/reference/types.forAwait.es2018.1.symbols
@@ -1,7 +1,7 @@
 === tests/cases/conformance/types/forAwait/types.forAwait.es2018.1.ts ===
 declare const asyncIterable: AsyncIterable<number>;
 >asyncIterable : Symbol(asyncIterable, Decl(types.forAwait.es2018.1.ts, 0, 13))
->AsyncIterable : Symbol(AsyncIterable, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterable : Symbol(AsyncIterable, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
 declare const iterable: Iterable<number>;
 >iterable : Symbol(iterable, Decl(types.forAwait.es2018.1.ts, 1, 13))
diff --git a/tests/baselines/reference/types.forAwait.es2018.2.symbols b/tests/baselines/reference/types.forAwait.es2018.2.symbols
index 2fb30f55ca8eb..1403c79d29b99 100644
--- a/tests/baselines/reference/types.forAwait.es2018.2.symbols
+++ b/tests/baselines/reference/types.forAwait.es2018.2.symbols
@@ -1,7 +1,7 @@
 === tests/cases/conformance/types/forAwait/types.forAwait.es2018.2.ts ===
 declare const asyncIterable: AsyncIterable<number>;
 >asyncIterable : Symbol(asyncIterable, Decl(types.forAwait.es2018.2.ts, 0, 13))
->AsyncIterable : Symbol(AsyncIterable, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterable : Symbol(AsyncIterable, Decl(lib.es2018.asynciterable.d.ts, --, --))
 
 declare const iterable: Iterable<number>;
 >iterable : Symbol(iterable, Decl(types.forAwait.es2018.2.ts, 1, 13))
diff --git a/tests/baselines/reference/uniqueSymbols.symbols b/tests/baselines/reference/uniqueSymbols.symbols
index d7da3595a59bd..377d84ff58f67 100644
--- a/tests/baselines/reference/uniqueSymbols.symbols
+++ b/tests/baselines/reference/uniqueSymbols.symbols
@@ -743,7 +743,7 @@ interface Context {
 
     method3(): AsyncIterableIterator<typeof s>;
 >method3 : Symbol(Context.method3, Decl(uniqueSymbols.ts, 219, 33))
->AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 >s : Symbol(s, Decl(uniqueSymbols.ts, 119, 13))
 
     method4(): IterableIterator<typeof s>;
diff --git a/tests/baselines/reference/uniqueSymbolsDeclarations.symbols b/tests/baselines/reference/uniqueSymbolsDeclarations.symbols
index 485b31af0fd59..eea10ac260461 100644
--- a/tests/baselines/reference/uniqueSymbolsDeclarations.symbols
+++ b/tests/baselines/reference/uniqueSymbolsDeclarations.symbols
@@ -738,7 +738,7 @@ interface Context {
 
     method3(): AsyncIterableIterator<typeof s>;
 >method3 : Symbol(Context.method3, Decl(uniqueSymbolsDeclarations.ts, 215, 33))
->AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.esnext.asynciterable.d.ts, --, --))
+>AsyncIterableIterator : Symbol(AsyncIterableIterator, Decl(lib.es2018.asynciterable.d.ts, --, --))
 >s : Symbol(s, Decl(uniqueSymbolsDeclarations.ts, 115, 13))
 
     method4(): IterableIterator<typeof s>;