perf(pegjs): optimize for speed

[P0lip]

optimize=speed

-rw-rw-r-- 1 p0lip p0lip  25K lut  6 21:00 index.cjs.js
-rw-rw-r-- 1 p0lip p0lip  503 lut  6 21:00 index.d.ts
-rw-rw-r-- 1 p0lip p0lip  24K lut  6 21:00 index.es.js

optimize=size

-rw-rw-r-- 1 p0lip p0lip  23K lut  6 20:56 index.cjs.js
-rw-rw-r-- 1 p0lip p0lip  503 lut  6 20:56 index.d.ts
-rw-rw-r-- 1 p0lip p0lip  22K lut  6 20:56 index.es.js

same project, just the initial processing part.

It isn't much of a win, but given there is no work involved, let's ship it.
Found when working on https://github.com/stoplightio/platform-internal/pull/873

[billiegoose]

Yeah, doesn't look like it was saving much size. But more than doubling in speed, wow!

[stoplight-bot]

🎉 This PR is included in version 1.3.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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