fix(scripts): skip files with stripped comments containing incorrect JavaScript

[trivikr]

Issue

Fixes: #3847

Description

Skips files with stripped comments if there is incorrect JavaScript.

Testing

Verified that files with incorrect JavaScript are not overwritten:

$ yarn build:types:downlevel
yarn run v1.22.19
$ node --es-module-specifier-resolution=node ./scripts/downlevel-dts
(node:35884) ExperimentalWarning: The Node.js specifier resolution flag is experimental. It could change or be removed at any time.
(Use `node --trace-warnings ...` to show where the warning was created)
Failed to format "clients/client-apigatewayv2/dist-types/ts3.4/models/models_0.d.ts". Skipping...
Failed to format "clients/client-cloudfront/dist-types/ts3.4/models/models_0.d.ts". Skipping...
Failed to format "clients/client-elastic-load-balancing-v2/dist-types/ts3.4/models/models_0.d.ts". Skipping...
Failed to format "clients/client-glacier/dist-types/ts3.4/models/models_0.d.ts". Skipping...
Failed to format "clients/client-lex-runtime-service/dist-types/ts3.4/models/models_0.d.ts". Skipping...
Failed to format "clients/client-lex-runtime-v2/dist-types/ts3.4/models/models_0.d.ts". Skipping...
Failed to format "clients/client-lookoutequipment/dist-types/ts3.4/models/models_0.d.ts". Skipping...
Failed to format "clients/client-mediastore/dist-types/ts3.4/models/models_0.d.ts". Skipping...
Failed to format "clients/client-quicksight/dist-types/ts3.4/QuickSight.d.ts". Skipping...
Failed to format "clients/client-route-53/dist-types/ts3.4/Route53.d.ts". Skipping...
Failed to format "clients/client-glue/dist-types/ts3.4/models/models_0.d.ts". Skipping...
Failed to format "clients/client-glue/dist-types/ts3.4/models/models_2.d.ts". Skipping...
Failed to format "clients/client-robomaker/dist-types/ts3.4/models/models_0.d.ts". Skipping...
Failed to format "clients/client-swf/dist-types/ts3.4/SWF.d.ts". Skipping...
Failed to format "clients/client-lightsail/dist-types/ts3.4/models/models_0.d.ts". Skipping...
Failed to format "clients/client-wisdom/dist-types/ts3.4/Wisdom.d.ts". Skipping...
Failed to format "clients/client-quicksight/dist-types/ts3.4/models/models_1.d.ts". Skipping...
Failed to format "clients/client-wafv2/dist-types/ts3.4/models/models_0.d.ts". Skipping...
Done in 101.21s.

Example file is which is not overwritten:

$ tail clients/client-lex-runtime-v2/dist-types/ts3.4/models/models_0.d.ts
 */
export declare const RecognizeTextResponseFilterSensitiveLog: (obj: RecognizeTextResponse) => any;
/**
 * @internal
 */
export declare const StartConversationResponseEventStreamFilterSensitiveLog: (obj: StartConversationResponseEventStream) => any;
/**
 * @internal
 */
export declare const StartConversationResponseFilterSensitiveLog: (obj: StartConversationResponse) => any;

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