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Fix typos and grammatical errors in jit-compiler.md#821

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Fix typos and grammatical errors in jit-compiler.md#821
LordImmaculate wants to merge 1 commit intoelysiajs:mainfrom
LordImmaculate:patch-1

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@LordImmaculate LordImmaculate commented Mar 27, 2026

Corrected typos and grammatical errors in the documentation for clarity and accuracy.

Summary by CodeRabbit

  • Documentation
    • Improved internal documentation for the JIT compiler with grammar corrections and consistency enhancements to ensure better readability and accuracy throughout the documentation.

Corrected typos and grammatical errors in the documentation for clarity and accuracy.
Copilot AI review requested due to automatic review settings March 27, 2026 16:27
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coderabbitai bot commented Mar 27, 2026

Walkthrough

Pfft, how adorable♡ You fixed up the grammar and spelling in the JIT compiler documentation. "Acheived" became "achieved," awkward phrasings got smoothed out, and that heading got a proper rename. Just prose corrections, nothing that actually changes the code itself. How boring... but I guess documentation matters toooo ┐(´ー`)┌

Changes

Cohort / File(s) Summary
Documentation Grammar & Spelling Fixes
docs/internal/jit-compiler.md
Corrected English usage: "acheived" → "achieved", "happend" → "happens", "not need" → "not needed". Standardized phrasing: "when request is made" → "When a request is made", "by make sure" → "by making sure". Fixed subject-verb agreement: "There are a big difference" → "There is a big difference", "There are more various" → "There are various". Refined wording in optimization descriptions and security considerations. Renamed section "Bigger Bundle Size" → "Increased Bundle Size".

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes


Grammar's been caught, mistakes all fought~♡
Your docs now gleam, no longer fraught ✨
Just fluff and polish, nothing deep—
But hey, at least you're not asleep! (´。• ᵕ •。`)

🚥 Pre-merge checks | ✅ 3
✅ Passed checks (3 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title accurately describes the main changes in the pull request—fixing typos and grammatical errors in jit-compiler.md documentation.
Docstring Coverage ✅ Passed No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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Pull request overview

This PR aims to improve clarity and correctness in the internal documentation explaining Elysia’s JIT “compiler” by fixing typos and grammar.

Changes:

  • Corrects multiple typos/grammar issues in the JIT compiler documentation.
  • Improves wording in performance/overhead and security-related sections for readability.
Comments suppressed due to low confidence (1)

docs/internal/jit-compiler.md:154

  • Wording is still off: “But it is still an overhead” should be “it’s still overhead”. Also “by settings precompile: true to Elysia constructor” should be “by setting … in the Elysia constructor” (or similar).
This process is **very fast** and usually takes < 0.005ms per route in most cases on a modern CPU and happens only **once per route**. But it is still an overhead.

<JIT />

This process can be moved to the startup phase by settings `precompile: true` to Elysia constructor to eliminate this overhead during the first request in exchange for a slower startup time.

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Comment on lines +136 to 139
There are various smaller optimization like
- using **Bun.websocket** when running on Bun for optimal WebSocket performance
- `Elysia.file` conditionally use `Bun.file` when available for faster file handling
- using `Headers.toJSON()` when running on Bun to reduce overhead when dealing headers
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Grammar/pluralization: this should be “various smaller optimizations”, and “like” reads better with a colon (“… optimizations like:”). Also, in the bullets below, verb agreement and phrasing need fixes (e.g., “conditionally uses …” and “when dealing with headers”).

Suggested change
There are various smaller optimization like
- using **Bun.websocket** when running on Bun for optimal WebSocket performance
- `Elysia.file` conditionally use `Bun.file` when available for faster file handling
- using `Headers.toJSON()` when running on Bun to reduce overhead when dealing headers
There are various smaller optimizations like:
- using **Bun.websocket** when running on Bun for optimal WebSocket performance
- `Elysia.file` conditionally uses `Bun.file` when available for faster file handling
- using `Headers.toJSON()` when running on Bun to reduce overhead when dealing with headers

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Using `new Function(...)` or `eval(...)` can introduce security risks **if not handled properly**.

But that's only "if not handled properly" part.
But that's only true if not handled properly.
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This section is redundant: the previous sentence already states the “if not handled properly” condition, and this line repeats it without adding new information. Consider removing it or replacing it with a concrete example of what “handled properly” means in Elysia’s case.

Suggested change
But that's only true if not handled properly.
In Elysia's case, "handled properly" means that generated functions are built only from trusted framework code (such as Sucrose and registered schemas), never directly from raw user input or request data.

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Comment on lines +170 to 173
Elysia takes precautions to ensure that the generated code is safe and does not expose vulnerabilities by making sure that only trusted code is executed. The **input is almost never user-controlled** and produced by Elysia (sucrose) itself.

## Libraries that `eval`
Elysia is not the only framework that use `new Function` and `eval`.
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Capitalization/grammar: “Elysia (sucrose)” should likely be “Elysia (Sucrose)”, and “the only framework that use” should be “frameworks that use”.

Suggested change
Elysia takes precautions to ensure that the generated code is safe and does not expose vulnerabilities by making sure that only trusted code is executed. The **input is almost never user-controlled** and produced by Elysia (sucrose) itself.
## Libraries that `eval`
Elysia is not the only framework that use `new Function` and `eval`.
Elysia takes precautions to ensure that the generated code is safe and does not expose vulnerabilities by making sure that only trusted code is executed. The **input is almost never user-controlled** and produced by Elysia (Sucrose) itself.
## Libraries that `eval`
Elysia is not the only framework that uses `new Function` and `eval`.

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</section>

Elysia speed is not only acheived by optimization for specific runtime eg. Bun native features like `Bun.serve.routes`. But also the way Elysia handles route registration and request handling.
Elysia speed is not only achieved by optimization for specific runtime eg. Bun native features like `Bun.serve.routes`. But also the way Elysia handles route registration and request handling.
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The sentence is still grammatically awkward: consider using possessive and plural forms and avoiding the sentence break after “runtime”. For example, “Elysia’s speed is achieved not only through optimizations for specific runtimes (e.g., Bun-native features like …) but also through …”

Suggested change
Elysia speed is not only achieved by optimization for specific runtime eg. Bun native features like `Bun.serve.routes`. But also the way Elysia handles route registration and request handling.
Elysia’s speed is achieved not only through optimizations for specific runtimes (e.g., Bun-native features like `Bun.serve.routes`) but also through the way Elysia handles route registration and request handling.

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Elysia speed is not only achieved by optimization for specific runtime eg. Bun native features like `Bun.serve.routes`. But also the way Elysia handles route registration and request handling.

Elysia has an **JIT "compiler"** embedded within its core since [Elysia 0.4](/blog/elysia-04) (30 Mar 2023) at (*src/compose.ts*) using `new Function(...)` or also known as `eval(...)`.
Elysia has a **JIT "compiler"** embedded within its core since [Elysia 0.4](/blog/elysia-04) (30 Mar 2023) at (*src/compose.ts*) using `new Function(...)` or also known as `eval(...)`.
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“embedded within its core … at (src/compose.ts)” reads like a location mismatch; “in (src/compose.ts)” or “located at …” would be clearer.

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The *"compiler"* is not a traditional compiler that translates code from one language to another. Instead, it dynamically generates optimized code for handling requests based on the defined routes and middleware. *(Which is why we put compiler in quotes.)*

When request is made to Elysia application for the first time for each route, Elysia dynamically generates optimized code specifically tailored to handle that route efficiently on the fly avoiding unnecessary overhead as much as possible.
When a request is made to the Elysia application for the first time for each route, Elysia dynamically generates optimized code specifically tailored to handle that route efficiently on the fly avoiding unnecessary overhead as much as possible.
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This sentence is hard to read due to repeated phrasing (“for the first time for each route”) and missing punctuation around “on the fly”. Consider reordering to “The first time a request is made for a route, …” and adding a comma before/after “on the fly” to improve clarity.

Suggested change
When a request is made to the Elysia application for the first time for each route, Elysia dynamically generates optimized code specifically tailored to handle that route efficiently on the fly avoiding unnecessary overhead as much as possible.
The first time a request is made for a route in the Elysia application, Elysia dynamically generates optimized code specifically tailored to handle that route efficiently, on the fly, avoiding unnecessary overhead as much as possible.

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Comment on lines 59 to +61
In this code, we can clearly see that this handler only need a `params` to be parsed.

Sucrose looks at code and tells the *"compiler"* to only parse **params** and skip parsing other parts of the request like **body**, **query**, **headers** entirely as it's not need.
Sucrose looks at code and tells the *"compiler"* to only parse **params** and skip parsing other parts of the request like **body**, **query**, **headers** entirely as it's not needed.
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A couple of grammar issues remain in this paragraph: “this handler only need” should be “only needs”, and “Sucrose looks at code” should be “looks at the code” for natural English.

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🧹 Nitpick comments (1)
docs/internal/jit-compiler.md (1)

170-170: Fixed that gerund form! ♡

"By make sure" → "by making sure"... Ehehehe~ Grammar basics much~? (≖‿≖)

But you got it right in the end! Good correction~

Buuuut since I'm feeling extra nitpicky today~ ♡ The static analysis tool has a teensy tiny suggestion: "almost never" could be shortened to just "rarely" or something more concise if you wanna be extra polished~ But honestly? It's fine as-is! (´。• ᵕ •。`)

✨ Optional wording refinement (super nitpicky~)

If you want to be extra concise, consider:

-Elysia takes precautions to ensure that the generated code is safe and does not expose vulnerabilities by making sure that only trusted code is executed. The **input is almost never user-controlled** and produced by Elysia (sucrose) itself.
+Elysia takes precautions to ensure that the generated code is safe and does not expose vulnerabilities by making sure that only trusted code is executed. The **input is rarely user-controlled** and produced by Elysia (sucrose) itself.

Or even stronger:

-Elysia takes precautions to ensure that the generated code is safe and does not expose vulnerabilities by making sure that only trusted code is executed. The **input is almost never user-controlled** and produced by Elysia (sucrose) itself.
+Elysia takes precautions to ensure that the generated code is safe and does not expose vulnerabilities by making sure that only trusted code is executed. The **input is never user-controlled** and produced by Elysia (sucrose) itself.

But this is suuuper optional~ The current wording is perfectly fine! (◕‿◕)♡

🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@docs/internal/jit-compiler.md` at line 170, The sentence "Elysia takes
precautions to ensure that the generated code is safe and does not expose
vulnerabilities by making sure that only trusted code is executed. The input is
almost never user-controlled and produced by Elysia (sucrose) itself." needs a
concise polish: ensure the gerund "by making sure" is used (already corrected)
and optionally shorten "almost never" to "rarely" for concision; update the
phrase "input is almost never user-controlled" to "input is rarely
user-controlled" in this sentence to improve clarity while keeping the same
meaning.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.

Nitpick comments:
In `@docs/internal/jit-compiler.md`:
- Line 170: The sentence "Elysia takes precautions to ensure that the generated
code is safe and does not expose vulnerabilities by making sure that only
trusted code is executed. The input is almost never user-controlled and produced
by Elysia (sucrose) itself." needs a concise polish: ensure the gerund "by
making sure" is used (already corrected) and optionally shorten "almost never"
to "rarely" for concision; update the phrase "input is almost never
user-controlled" to "input is rarely user-controlled" in this sentence to
improve clarity while keeping the same meaning.

ℹ️ Review info
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Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: ecc8adc4-f1fe-42cb-be2b-51dd08d2f833

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Reviewing files that changed from the base of the PR and between c1d8178 and 8a018c2.

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  • docs/internal/jit-compiler.md

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