fix(scripts): run downlevel-dts script in parallel

[trivikr]

Issue

Refs: #2834 (comment)

Description

Runs downlevel-dts scripts in parallel to improve performance.

Before

$ foreach dir ("lib" "packages" "clients" "protocol_tests")
  for d in $dir/* ;do (cd "$d" && rm -rf dist/types/ts3.4); done
end

$ time yarn downlevel-dts
yarn run v1.22.11
$ node ./scripts/downlevel-dts
Done in 699.06s.
yarn downlevel-dts  1165.78s user 64.57s system 175% cpu 11:39.19 total

After

$ foreach dir ("lib" "packages" "clients" "protocol_tests")
  for d in $dir/* ;do (cd "$d" && rm -rf dist/types/ts3.4); done
end

$ time yarn downlevel-dts
yarn run v1.22.11
$ node --es-module-specifier-resolution=node ./scripts/downlevel-dts
Done in 58.73s.
yarn downlevel-dts  1977.88s user 84.27s system 3503% cpu 58.863 total

Testing

Verified that comments are removed from *.d.ts files.

Tested by running manually running local downlevel-dts in packages/abort-controller followed by running global downlevel-dts:

Before

$ head dist/types/ts3.4/AbortSignal.d.ts
import { AbortHandler, AbortSignal as IAbortSignal } from "@aws-sdk/types";
export declare class AbortSignal implements IAbortSignal {
    onabort: AbortHandler | null;
    private _aborted;
    constructor();
    /*
    * Whether the associated operation has already been cancelled.
    */
    readonly aborted: boolean;
    /**

After

$ head dist/types/ts3.4/AbortSignal.d.ts
import { AbortHandler, AbortSignal as IAbortSignal } from "@aws-sdk/types";
export declare class AbortSignal implements IAbortSignal {
    onabort: AbortHandler | null;
    private _aborted;
    constructor();

    readonly aborted: boolean;

    abort(): void;
}

---

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[codecov-commenter]

Codecov Report

Merging #2837 (4de7f60) into main (2923d66) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2837   +/-   ##
=======================================
  Coverage   60.41%   60.41%           
=======================================
  Files         554      554           
  Lines       28885    28885           
  Branches     7072     7072           
=======================================
  Hits        17452    17452           
  Misses      11433    11433           

---

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[AllanZhengYP]

async module is pretty awesome!

[github-actions]

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