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Always error on an attempt to use await as an identifier in modules #55503

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10 changes: 2 additions & 8 deletions src/compiler/binder.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -167,7 +167,6 @@ import {
isIdentifier,
isIdentifierName,
isInJSFile,
isInTopLevelContext,
isJSDocConstructSignature,
isJSDocEnumTag,
isJSDocTemplateTag,
Expand Down Expand Up @@ -2457,13 +2456,8 @@ function createBinder(): (file: SourceFile, options: CompilerOptions) => void {
) {
file.bindDiagnostics.push(createDiagnosticForNode(node, getStrictModeIdentifierMessage(node), declarationNameToString(node)));
}
else if (originalKeywordKind === SyntaxKind.AwaitKeyword) {
if (isExternalModule(file) && isInTopLevelContext(node)) {
file.bindDiagnostics.push(createDiagnosticForNode(node, Diagnostics.Identifier_expected_0_is_a_reserved_word_at_the_top_level_of_a_module, declarationNameToString(node)));
}
else if (node.flags & NodeFlags.AwaitContext) {
file.bindDiagnostics.push(createDiagnosticForNode(node, Diagnostics.Identifier_expected_0_is_a_reserved_word_that_cannot_be_used_here, declarationNameToString(node)));
}
else if (originalKeywordKind === SyntaxKind.AwaitKeyword && (node.flags & NodeFlags.AwaitContext || isExternalModule(file))) {
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Perhaps this would deserve a new diagnostic. The other one (with node.flags & NodeFlags.AwaitContext) didn't have a specific diagnostic meant for it so I skipped adding one here as well.

I think though that it could be nice to add a specific diagnostic here (and maybe add a specific one for that other case as well while at it). If you agree - should this be a complete new diagnostic code or could the existing code be reused? Probably a new one makes more sense.

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I believe technically this is allowed in non-strict CJS, but I'd rather not make weird exceptions.

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yes, it only technically has to be disallowed in modules 😉 Isn't allowing it in TS files with script targets a weird exception already? 😅

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It's not allowed in non-strict CJS, it's always allowed there. The actual rule is that this is disallowed in modules - not that it's disallowed in strict mode 🤷

file.bindDiagnostics.push(createDiagnosticForNode(node, Diagnostics.Identifier_expected_0_is_a_reserved_word_that_cannot_be_used_here, declarationNameToString(node)));
}
else if (originalKeywordKind === SyntaxKind.YieldKeyword && node.flags & NodeFlags.YieldContext) {
file.bindDiagnostics.push(createDiagnosticForNode(node, Diagnostics.Identifier_expected_0_is_a_reserved_word_that_cannot_be_used_here, declarationNameToString(node)));
Expand Down
4 changes: 0 additions & 4 deletions src/compiler/diagnosticMessages.json
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Expand Up @@ -843,10 +843,6 @@
"category": "Error",
"code": 1261
},
"Identifier expected. '{0}' is a reserved word at the top-level of a module.": {
"category": "Error",
"code": 1262
},
"Declarations with initializers cannot also have definite assignment assertions.": {
"category": "Error",
"code": 1263
Expand Down
1 change: 0 additions & 1 deletion src/compiler/program.ts
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Expand Up @@ -1346,7 +1346,6 @@ export const plainJSErrors = new Set<number>([
Diagnostics.A_module_cannot_have_multiple_default_exports.code,
Diagnostics.Another_export_default_is_here.code,
Diagnostics.The_first_export_default_is_here.code,
Diagnostics.Identifier_expected_0_is_a_reserved_word_at_the_top_level_of_a_module.code,
Diagnostics.Identifier_expected_0_is_a_reserved_word_in_strict_mode_Modules_are_automatically_in_strict_mode.code,
Diagnostics.Identifier_expected_0_is_a_reserved_word_that_cannot_be_used_here.code,
Diagnostics.constructor_is_a_reserved_word.code,
Expand Down
25 changes: 14 additions & 11 deletions tests/baselines/reference/exportDefaultAsyncFunction2.errors.txt
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@@ -1,42 +1,45 @@
a.ts(1,17): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
asyncawait.ts(2,17): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
c.ts(1,17): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
d.ts(1,17): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
e.ts(1,17): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
a.ts(1,17): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.
a.ts(2,28): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.
asyncawait.ts(2,17): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.
c.ts(1,17): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.
d.ts(1,17): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.
e.ts(1,17): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.


==== asyncawait.ts (1 errors) ====
export function async<T>(...args: any[]): any { }
export function await(...args: any[]): any { }
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.

==== a.ts (1 errors) ====
==== a.ts (2 errors) ====
import { async, await } from 'asyncawait';
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.
export default async(() => await(Promise.resolve(1)));
~~~~~
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.

==== b.ts (0 errors) ====
export default async () => { return 0; };

==== c.ts (1 errors) ====
import { async, await } from 'asyncawait';
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.
export default async<number>();

==== d.ts (1 errors) ====
import { async, await } from 'asyncawait';
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.

export default async;

==== e.ts (1 errors) ====
import { async, await } from 'asyncawait';
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.

export default async

Expand Down
4 changes: 2 additions & 2 deletions tests/baselines/reference/plainJSBinderErrors.errors.txt
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@@ -1,6 +1,6 @@
plainJSBinderErrors.js(1,1): error TS2528: A module cannot have multiple default exports.
plainJSBinderErrors.js(2,1): error TS2528: A module cannot have multiple default exports.
plainJSBinderErrors.js(3,7): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
plainJSBinderErrors.js(3,7): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.
plainJSBinderErrors.js(4,7): error TS1214: Identifier expected. 'yield' is a reserved word in strict mode. Modules are automatically in strict mode.
plainJSBinderErrors.js(6,11): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.
plainJSBinderErrors.js(9,11): error TS1214: Identifier expected. 'yield' is a reserved word in strict mode. Modules are automatically in strict mode.
Expand Down Expand Up @@ -28,7 +28,7 @@ plainJSBinderErrors.js(40,7): error TS1215: Invalid use of 'arguments'. Modules
!!! related TS2752 plainJSBinderErrors.js:1:1: The first export default is here.
const await = 1
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.
const yield = 2
~~~~~
!!! error TS1214: Identifier expected. 'yield' is a reserved word in strict mode. Modules are automatically in strict mode.
Expand Down
4 changes: 2 additions & 2 deletions tests/baselines/reference/topLevelAwaitErrors.10(module=es2022).errors.txt
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@@ -1,11 +1,11 @@
index.ts(2,19): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
index.ts(2,19): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.


==== index.ts (1 errors) ====
// await disallowed in alias of named import
import { await as await } from "./other";
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.

==== other.ts (0 errors) ====
declare const _await: any;
Expand Down
4 changes: 2 additions & 2 deletions tests/baselines/reference/topLevelAwaitErrors.10(module=esnext).errors.txt
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@@ -1,11 +1,11 @@
index.ts(2,19): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
index.ts(2,19): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.


==== index.ts (1 errors) ====
// await disallowed in alias of named import
import { await as await } from "./other";
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.

==== other.ts (0 errors) ====
declare const _await: any;
Expand Down
4 changes: 2 additions & 2 deletions tests/baselines/reference/topLevelAwaitErrors.11.errors.txt
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@@ -1,12 +1,12 @@
index.ts(3,8): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
index.ts(3,8): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.


==== index.ts (1 errors) ====
// await disallowed in import=
declare var require: any;
import await = require("./other");
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.

==== other.ts (0 errors) ====
declare const _await: any;
Expand Down
4 changes: 2 additions & 2 deletions tests/baselines/reference/topLevelAwaitErrors.12(module=es2022).errors.txt
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@@ -1,4 +1,4 @@
topLevelAwaitErrors.12.ts(5,8): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
topLevelAwaitErrors.12.ts(5,8): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.


==== topLevelAwaitErrors.12.ts (1 errors) ====
Expand All @@ -8,5 +8,5 @@ topLevelAwaitErrors.12.ts(5,8): error TS1262: Identifier expected. 'await' is a
// await disallowed in import=namespace when in a module
import await = foo.await;
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.

4 changes: 2 additions & 2 deletions tests/baselines/reference/topLevelAwaitErrors.12(module=esnext).errors.txt
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@@ -1,4 +1,4 @@
topLevelAwaitErrors.12.ts(5,8): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
topLevelAwaitErrors.12.ts(5,8): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.


==== topLevelAwaitErrors.12.ts (1 errors) ====
Expand All @@ -8,5 +8,5 @@ topLevelAwaitErrors.12.ts(5,8): error TS1262: Identifier expected. 'await' is a
// await disallowed in import=namespace when in a module
import await = foo.await;
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.

4 changes: 2 additions & 2 deletions tests/baselines/reference/topLevelAwaitErrors.2(module=es2022).errors.txt
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@@ -1,4 +1,4 @@
topLevelAwaitErrors.2.ts(4,5): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
topLevelAwaitErrors.2.ts(4,5): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.


==== topLevelAwaitErrors.2.ts (1 errors) ====
Expand All @@ -7,5 +7,5 @@ topLevelAwaitErrors.2.ts(4,5): error TS1262: Identifier expected. 'await' is a r
// reparse variable name as await should fail
var await = 1;
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.

4 changes: 2 additions & 2 deletions tests/baselines/reference/topLevelAwaitErrors.2(module=esnext).errors.txt
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@@ -1,4 +1,4 @@
topLevelAwaitErrors.2.ts(4,5): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
topLevelAwaitErrors.2.ts(4,5): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.


==== topLevelAwaitErrors.2.ts (1 errors) ====
Expand All @@ -7,5 +7,5 @@ topLevelAwaitErrors.2.ts(4,5): error TS1262: Identifier expected. 'await' is a r
// reparse variable name as await should fail
var await = 1;
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.

4 changes: 2 additions & 2 deletions tests/baselines/reference/topLevelAwaitErrors.3(module=es2022).errors.txt
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topLevelAwaitErrors.3.ts(4,6): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
topLevelAwaitErrors.3.ts(4,6): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.


==== topLevelAwaitErrors.3.ts (1 errors) ====
Expand All @@ -7,5 +7,5 @@ topLevelAwaitErrors.3.ts(4,6): error TS1262: Identifier expected. 'await' is a r
// reparse binding pattern as await should fail
var {await} = {await:1};
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.

4 changes: 2 additions & 2 deletions tests/baselines/reference/topLevelAwaitErrors.3(module=esnext).errors.txt
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topLevelAwaitErrors.3.ts(4,6): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
topLevelAwaitErrors.3.ts(4,6): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.


==== topLevelAwaitErrors.3.ts (1 errors) ====
Expand All @@ -7,5 +7,5 @@ topLevelAwaitErrors.3.ts(4,6): error TS1262: Identifier expected. 'await' is a r
// reparse binding pattern as await should fail
var {await} = {await:1};
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.

4 changes: 2 additions & 2 deletions tests/baselines/reference/topLevelAwaitErrors.4(module=es2022).errors.txt
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topLevelAwaitErrors.4.ts(4,6): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
topLevelAwaitErrors.4.ts(4,6): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.


==== topLevelAwaitErrors.4.ts (1 errors) ====
Expand All @@ -7,5 +7,5 @@ topLevelAwaitErrors.4.ts(4,6): error TS1262: Identifier expected. 'await' is a r
// reparse binding pattern as await should fail
var [await] = [1];
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.

4 changes: 2 additions & 2 deletions tests/baselines/reference/topLevelAwaitErrors.4(module=esnext).errors.txt
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topLevelAwaitErrors.4.ts(4,6): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
topLevelAwaitErrors.4.ts(4,6): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.


==== topLevelAwaitErrors.4.ts (1 errors) ====
Expand All @@ -7,5 +7,5 @@ topLevelAwaitErrors.4.ts(4,6): error TS1262: Identifier expected. 'await' is a r
// reparse binding pattern as await should fail
var [await] = [1];
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.

4 changes: 2 additions & 2 deletions tests/baselines/reference/topLevelAwaitErrors.5(module=es2022).errors.txt
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topLevelAwaitErrors.5.ts(2,14): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
topLevelAwaitErrors.5.ts(2,14): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.


==== topLevelAwaitErrors.5.ts (1 errors) ====
// await in exported class name should fail
export class await {
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.
}

4 changes: 2 additions & 2 deletions tests/baselines/reference/topLevelAwaitErrors.5(module=esnext).errors.txt
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topLevelAwaitErrors.5.ts(2,14): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
topLevelAwaitErrors.5.ts(2,14): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.


==== topLevelAwaitErrors.5.ts (1 errors) ====
// await in exported class name should fail
export class await {
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.
}

4 changes: 2 additions & 2 deletions tests/baselines/reference/topLevelAwaitErrors.6(module=es2022).errors.txt
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topLevelAwaitErrors.6.ts(2,17): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
topLevelAwaitErrors.6.ts(2,17): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.


==== topLevelAwaitErrors.6.ts (1 errors) ====
// await in exported function name should fail
export function await() {
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.
}

4 changes: 2 additions & 2 deletions tests/baselines/reference/topLevelAwaitErrors.6(module=esnext).errors.txt
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topLevelAwaitErrors.6.ts(2,17): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
topLevelAwaitErrors.6.ts(2,17): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.


==== topLevelAwaitErrors.6.ts (1 errors) ====
// await in exported function name should fail
export function await() {
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.
}

4 changes: 2 additions & 2 deletions tests/baselines/reference/topLevelAwaitErrors.7(module=es2022).errors.txt
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index.ts(2,13): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
index.ts(2,13): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.


==== index.ts (1 errors) ====
// await disallowed in namespace import
import * as await from "./other";
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.

==== other.ts (0 errors) ====
declare const _await: any;
Expand Down
4 changes: 2 additions & 2 deletions tests/baselines/reference/topLevelAwaitErrors.7(module=esnext).errors.txt
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@@ -1,11 +1,11 @@
index.ts(2,13): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
index.ts(2,13): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.


==== index.ts (1 errors) ====
// await disallowed in namespace import
import * as await from "./other";
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.

==== other.ts (0 errors) ====
declare const _await: any;
Expand Down
4 changes: 2 additions & 2 deletions tests/baselines/reference/topLevelAwaitErrors.8(module=es2022).errors.txt
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index.ts(2,8): error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
index.ts(2,8): error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.


==== index.ts (1 errors) ====
// await disallowed in default import
import await from "./other";
~~~~~
!!! error TS1262: Identifier expected. 'await' is a reserved word at the top-level of a module.
!!! error TS1359: Identifier expected. 'await' is a reserved word that cannot be used here.

==== other.ts (0 errors) ====
declare const _await: any;
Expand Down
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