SWC

https://github.com/swc-project/swc
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SWC (Speedy Web Compiler) is a super-fast TypeScript/JavaScript compiler written in Rust, serving as...
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### Install Example Dependencies

Source: https://github.com/swc-project/swc/blob/main/bindings/binding_core_wasm/example/readme.txt

Command to install the necessary npm dependencies for the example project.

```bash
cd swc/wasm/example
npm install
```

--------------------------------

### Start Webpack Development Server

Source: https://github.com/swc-project/swc/blob/main/bindings/binding_core_wasm/example/readme.txt

Command to start the webpack-dev-server for the example application.

```bash
cd swc/wasm/example
npm run serve
```

--------------------------------

### Install eslint with npm

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_parser/benches/files/github_com_17_05_2022.html

Command to install eslint as a dependency, with the output showing the installation summary.

```bash
npm install eslint
```

--------------------------------

### Install dependencies

Source: https://github.com/swc-project/swc/blob/main/CONTRIBUTING.md

Install JavaScript dependencies using pnpm.

```bash
pnpm install
```

--------------------------------

### Start Docker daemon for native addon containers

Source: https://github.com/swc-project/swc/blob/main/docs/native-addon-carriers-verification.md

Command to start Docker daemon with a custom data root and socket. Failed with 'sudo: a password is required', so no Docker daemon or cross-architecture emulator is available.

```shell
sudo -n dockerd --data-root /tmp/swc-native-docker --host unix:///tmp/swc-native-docker.sock --iptables=false --bridge=none
```

--------------------------------

### unitTest() usage examples

Source: https://github.com/swc-project/swc/blob/main/crates/swc/tests/deno-unit/README.md

Shows how to define Deno runtime tests using the unitTest() wrapper from test_util.ts. The first example is a simple test function; the second uses options to ignore Windows and require read/write permissions.

```typescript
import { unitTest } from "./test_util.ts";

unitTest(function simpleTestFn(): void {
  // test code here
});

unitTest({
    ignore: Deno.build.os === "windows",
    perms: { read: true, write: true },
  },
  function complexTestFn(): void {
    // test code here
  }
);
```

--------------------------------

### Example Hermes stacktrace

Source: https://github.com/swc-project/swc/blob/main/crates/swc_sourcemap/tests/fixtures/react-native-hermes/README.md

A sample stacktrace obtained when running bytecode generated by Hermes.

```text
Error: lets throw!
    at foo (address at unknown:1:11939)
    at anonymous (address at unknown:1:11857)
    at loadModuleImplementation (address at unknown:1:2608)
    at guardedLoadModule (address at unknown:1:1973)
    at metroRequire (address at unknown:1:1494)
    at global (address at unknown:1:508)
```

--------------------------------

### Example changeset format

Source: https://github.com/swc-project/swc/blob/main/CONTRIBUTING.md

A changeset for SWC requires listing crate names and their version bump type (patch, minor, or major) in the front matter.

```markdown
---
swc_core: patch
swc_ecma_transforms_base: patch
---

fix(es/renamer): Check `preserved` in normal renaming mode
```

--------------------------------

### Assembly label and instruction

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_codegen/tests/fixture/pre-tag/output.min.html

Example of assembly code using labels and leaq instructions.

```asm
Label current;
// Load effective address of current instruction into rcx.
__ leaq(rcx, Operand(&current));
__ bind(&current);
```

```asm
Label current;
// Load effective address of current instruction into rcx.
__ leaq(rcx, Operand(&current));
__ bind(&current);
```

--------------------------------

### Example Stack Trace Output

Source: https://github.com/swc-project/swc/blob/main/crates/swc_sourcemap/tests/fixtures/react-native-metro/README.md

The stack trace produced when running the bundled JavaScript file through Node.js.

```text
Error: lets throw!
    at foo (output.js:1289:11)
    at output.js:1280:19
    at loadModuleImplementation (output.js:271:7)
    at guardedLoadModule (output.js:163:23)
    at metroRequire (output.js:98:75)
    at Object.<anonymous> (output.js:1292:1)
    at Module._compile (internal/modules/cjs/loader.js:1151:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1171:10)
    at Module.load (internal/modules/cjs/loader.js:1000:32)
    at Function.Module._load (internal/modules/cjs/loader.js:899:14)
```

--------------------------------

### Configure SWC_NATIVE_BINDING_CACHE for Jenkins

Source: https://github.com/swc-project/swc/blob/main/crates/swc_native_addon/README.md

Example command to run a Node.js build with a custom cache directory and disabled security checks, suitable for isolated CI environments.

```sh
SWC_NATIVE_BINDING_CACHE_SKIP_SECURITY_CHECK=1 \
    SWC_NATIVE_BINDING_CACHE=/absolute/jenkins/cache node build.js
```

--------------------------------

### Pre tag with simple text repetition

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_codegen/tests/fixture/pre-tag/output.min.html

Additional simple text content examples.

```html
Text
```

```html
Text
```

--------------------------------

### README.md content for Octocat Classifier

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_parser/benches/files/github_com_17_05_2022.html

Markdown README for the Octocat Classifier project, including badges, description, and installation instructions.

```markdown
# Octocat Classifier :octopus: :cat: :mag:

![](https://img.shields.io/badge/build-passing-brightgreen) ![](https://img.shields.io/badge/coverage-90%25-green) ![](https://img.shields.io/badge/dependencies-up%20to%20date-brightgreen)

As the name suggests, Octocat Classifier is used to determine whether a given image contains an Octocat. It is trained with images from the [Octodex](1), images shared with [#MyOctocat on Twitter](2), and [photographs of laptops with :octocat: stickers on them]().

## Installation

```
git clone https://github.com/jasonetco/octocat-classifier
```
```

--------------------------------

### HTML Whitespace Collapse Example

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_minifier/tests/fixture/text/collapse-whitespace-all/output.min.html

A demonstration of how the minifier processes nested text elements and whitespace within a block structure.

```html

    Text
    
        Text
    
    
        Text
    

```

--------------------------------

### Whitespace Block 1

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_codegen/tests/fixture/pre-tag/input.html

Example of whitespace preservation with empty lines.

```text



   


       Text


   
```

--------------------------------

### Running unit_test_runner.ts with various flags

Source: https://github.com/swc-project/swc/blob/main/crates/swc/tests/deno-unit/README.md

Commands to run the Deno unit test runner in different modes: master, verbose, no permissions, specific permissions, worker mode, and specific tests. Also includes a cargo run example with RUST_BACKTRACE.

```shell
# Run all tests. Spawns worker processes for each discovered permission
# combination:
target/debug/deno run -A cli/tests/unit/unit_test_runner.ts --master

# By default all output of worker processes is discarded; for debug purposes
# the --verbose flag preserves output from the worker
target/debug/deno run -A cli/tests/unit/unit_test_runner.ts --master --verbose

# Run subset of tests that don't require any permissions
target/debug/deno run --unstable cli/tests/unit/unit_test_runner.ts

# Run subset tests that require "net" and "read" permissions
target/debug/deno run --unstable --allow-net --allow-read cli/tests/unit/unit_test_runner.ts

# "worker" mode communicates with parent using TCP socket on provided address;
# after initial setup drops permissions to specified set. It shouldn't be used
# directly, only be "master" process.
target/debug/deno run -A cli/tests/unit/unit_test_runner.ts --worker --addr=127.0.0.1:4500 --perms=net,write,run

# Run specific tests
target/debug/deno run --unstable --allow-net cli/tests/unit/unit_test_runner.ts -- netTcpListenClose

RUST_BACKTRACE=1 cargo run -- run --unstable --allow-read --allow-write cli/tests/unit/unit_test_runner.ts -- netUnixDialListen
```

--------------------------------

### Whitespace Block 2

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_codegen/tests/fixture/pre-tag/input.html

Example of whitespace preservation with leading newlines.

```text




       Text
```

--------------------------------

### Whitespace Block 4

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_codegen/tests/fixture/pre-tag/input.html

Example of whitespace preservation with leading spaces.

```text

    Text
```

--------------------------------

### Whitespace Block 5

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_codegen/tests/fixture/pre-tag/input.html

Example of whitespace preservation with multiple newlines and spaces.

```text



    Text
```

--------------------------------

### HTML Whitespace Preservation Example

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_minifier/tests/fixture/text/collapse-whitespace-disabled/output.min.html

A test fixture demonstrating how the minifier handles nested whitespace within block elements.

```html
    Text

    

        Text

    

    

        Text

    
```

--------------------------------

### Whitespace Block 3

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_codegen/tests/fixture/pre-tag/input.html

Example of whitespace preservation with leading spaces and newlines.

```text
   


       Text
```

--------------------------------

### Pre tag with complex whitespace

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_codegen/tests/fixture/pre-tag/output.min.html

Example showing complex whitespace and indentation patterns.

```html



   


       Text



   
```

--------------------------------

### Script Minification Fixture

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_minifier/tests/fixture/element/script-options-2/input.html

Example of a script block used for testing top-level variable mangling.

```javascript
/* Should mangle top level stuff */ var topLevel = function test() { let foo = "bar"; if (foo) { foo += "baz"; } console.log(foo); };
```

--------------------------------

### Skip security checks for native binding cache

Source: https://github.com/swc-project/swc/blob/main/docs/native-addon-carriers.md

Example of running a Node.js build process with security checks disabled for the native binding cache, suitable for trusted environments like isolated Jenkins executors.

```sh
SWC_NATIVE_BINDING_CACHE_SKIP_SECURITY_CHECK=1 \
    XDG_CACHE_HOME=/absolute/jenkins/cache node build.js
```

--------------------------------

### Update SWC crates via shell script

Source: https://github.com/swc-project/swc/blob/main/README.md

Updates all SWC dependencies to the latest version and executes a cargo build. Requires jq and cargo-upgrade to be installed.

```bash
curl https://raw.githubusercontent.com/swc-project/swc/main/scripts/update-all-swc-crates.sh | bash -s
```

--------------------------------

### tokenize

Source: https://github.com/swc-project/swc/blob/main/bindings/binding_nodejs_support_wasm/README.md

Tokenizes JavaScript source code and returns an array of tokens with kind, start, and end offsets. Intended for REPL highlighting, not syntax validation or TypeScript tokenization.

```APIDOC
## tokenize

### Description
Tokenizes JavaScript source code and returns an array of tokens with kind, start, and end offsets. Intended for REPL highlighting, not syntax validation or TypeScript tokenization.

### Method
Function call

### Signature
- `tokenize(src: string | Uint8Array): { kind: string, start: number, end: number }[]`

### Parameters
- **src** (string | Uint8Array) - Required - Source code to tokenize.

### Returns
- **Array of token objects** - Each token has:
  - **kind** (string) - One of: `keyword`, `identifier`, `number`, `bigint`, `string`, `template`, `regexp`, `comment`, `punctuator`.
  - **start** (number) - Zero-based UTF-16 code unit offset (inclusive).
  - **end** (number) - Zero-based UTF-16 code unit offset (exclusive).

### Behavior
- Offsets are zero-based UTF-16 code units with an exclusive end, so `src.slice(start, end)` extracts the token.
- Comments include their delimiters; hashbangs are comments.
- Whitespace and EOF are omitted.
- Template text includes its backticks, while `${` and `}` are punctuators and interpolated expressions have their own tokens.
- On incomplete or invalid input it returns the tokens captured before parsing stopped, without throwing a syntax error.

```

--------------------------------

### Compare Startup Performance

Source: https://github.com/swc-project/swc/blob/main/docs/native-addon-macos-startup.md

Run the comparison script to record startup samples, medians, and storage observations for raw and carrier-based native addons.

```sh
node scripts/native/compare-startup.mjs raw.node before.node after.node results.json
```

--------------------------------

### Create a new fixture directory and input file

Source: https://github.com/swc-project/swc/blob/main/crates/swc_estree_compat/tests/README.md

Step 1 of writing a test involves creating a directory in fixtures and providing an input JavaScript file.

```bash
mkdir fixtures/my-test
echo "var a = true;" > fixtures/my-test/input.js
```

--------------------------------

### Run cargo fmt

Source: https://github.com/swc-project/swc/blob/main/crates/swc_native_addon/VERIFICATION.md

Formats all Rust code in the project.

```bash
cargo fmt --all
```

--------------------------------

### Fetch submodules

Source: https://github.com/swc-project/swc/blob/main/CONTRIBUTING.md

Initialize and update submodules to pull in the required ECMAScript test suites.

```bash
git submodule update --init --recursive
```

--------------------------------

### Pack and build native addon carrier

Source: https://github.com/swc-project/swc/blob/main/crates/swc_native_addon/README.md

Run the host packer after the final raw-addon strip and signing steps, then build the binding crate with the embedded-payload feature.

```sh
cargo run -p swc_native_addon_pack -- \
  --input /absolute/final-stripped.node --output /absolute/payload.swcn \
  --target x86_64-unknown-linux-gnu
SWC_NATIVE_BINDING_PAYLOAD=/absolute/payload.swcn \
  cargo build -p binding_native_addon --release --features embedded-payload \
  --target x86_64-unknown-linux-gnu
```

--------------------------------

### Print AST with cargo run

Source: https://github.com/swc-project/swc/blob/main/crates/swc-ast-explorer/README.md

Use this command to pipe code into the swc-ast-explorer binary to view its generated abstract syntax tree.

```shell
echo "console.log('hello')" | cargo run -p swc-ast-explorer
```

--------------------------------

### Run node bindings and integration tests

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Build and test node bindings when integration paths are modified.

```bash
(cd packages/core && pnpm build:dev && pnpm test)
```

--------------------------------

### Build SWC for Web

Source: https://github.com/swc-project/swc/blob/main/bindings/binding_core_wasm/example/readme.txt

Commands to navigate to the WASM directory and execute the build script for the web release.

```bash
cd swc/wasm
./scripts/build_web_release.sh
```

--------------------------------

### Build and test core packages

Source: https://github.com/swc-project/swc/blob/main/crates/swc_native_addon/VERIFICATION.md

Builds the core package in development mode and runs the test suite.

```bash
pnpm build:dev
pnpm test
```

--------------------------------

### Run swc_ecma_minifier Execution Tests

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to run execution tests and update fixtures for the swc_ecma_minifier crate.

```bash
./scripts/exec.sh
```

```bash
./scripts/test.sh
```

```bash
UPDATE=1 ./scripts/test.sh
```

--------------------------------

### Run tests with swc_v1 features

Source: https://github.com/swc-project/swc/blob/main/CONTRIBUTING.md

Execute tests using the swc_v1 feature set.

```bash
cargo test --all --no-default-features --features swc_v1 --features filesystem_cache
```

--------------------------------

### Initialize submodules and run local validation checks

Source: https://github.com/swc-project/swc/blob/main/docs/native-addon-carriers.md

Commands to initialize git submodules and execute the test suites for native addons, including Node, Cargo, and Python-based checks.

```sh
git submodule update --init --recursive
node --test scripts/native/*.test.mjs
cargo test -p swc_native_addon -p swc_native_addon_pack -p binding_native_addon
python3 crates/swc_native_addon/scripts/msrv.py
cargo fmt --all
cargo clippy --all --all-targets -- -D warnings
```

--------------------------------

### Update and verify swc_css_compat fixture tests

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc_css_compat crate.

```bash
UPDATE=1 cargo test -p swc_css_compat
```

```bash
cargo test -p swc_css_compat
```

--------------------------------

### Run and update fixture tests

Source: https://github.com/swc-project/swc/blob/main/crates/swc_ecma_minifier/AGENTS.md

Commands to run fixture tests and optionally update them.

```bash
./scripts/test.sh
```

```bash
UPDATE=1 ./scripts/test.sh
```

--------------------------------

### Create repository with gh CLI

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_parser/benches/files/github_com_17_05_2022.html

Command to create a GitHub repository using the gh CLI, followed by the output showing the repository creation and remote addition.

```bash
gh repo create octocat-classifier
```

--------------------------------

### Run tests with swc_v2 features

Source: https://github.com/swc-project/swc/blob/main/CONTRIBUTING.md

Execute tests using the swc_v2 feature set.

```bash
cargo test --all --no-default-features --features swc_v2 --features filesystem_cache
```

--------------------------------

### Update and Verify Fixtures for swc_ecma_preset_env

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update fixture outputs and verify tests for the swc_ecma_preset_env crate.

```bash
UPDATE=1 cargo test -p swc_ecma_preset_env
```

```bash
cargo test -p swc_ecma_preset_env
```

--------------------------------

### Run tests with cargo

Source: https://github.com/swc-project/swc/blob/main/crates/swc_estree_compat/README.md

Execute the test suite for the crate using the cargo CLI.

```bash
cargo test
```

--------------------------------

### Update and Verify swc_estree_compat Fixtures

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc_estree_compat crate.

```bash
UPDATE=1 cargo test -p swc_estree_compat
```

```bash
cargo test -p swc_estree_compat
```

--------------------------------

### Update and Verify swc_css_minifier Fixtures

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc_css_minifier crate.

```bash
UPDATE=1 cargo test -p swc_css_minifier
```

```bash
cargo test -p swc_css_minifier
```

--------------------------------

### Run fixture tests

Source: https://github.com/swc-project/swc/blob/main/crates/swc_ecma_minifier/README.md

Run fixture tests from the ./crates/swc_ecma_minifier directory. You can optionally filter by file path and enable debug features.

```bash
./scripts/test.sh
./scripts/test.sh foo
./scripts/test.sh foo --features debug
```

--------------------------------

### Update fixture outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_estree_compat/AGENTS.md

Run this command to update the generated fixture outputs for the swc_estree_compat crate.

```bash
UPDATE=1 cargo test -p swc_estree_compat
```

--------------------------------

### Update fixture outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_ecma_preset_env/AGENTS.md

Run this command to update the generated fixture outputs for the swc_ecma_preset_env crate.

```bash
UPDATE=1 cargo test -p swc_ecma_preset_env
```

--------------------------------

### Update fixture outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_ecma_transforms_optimization/AGENTS.md

Run this command to update the generated fixture outputs for the optimization crate.

```bash
UPDATE=1 cargo test -p swc_ecma_transforms_optimization
```

--------------------------------

### Generate the expected output JSON

Source: https://github.com/swc-project/swc/blob/main/crates/swc_estree_compat/tests/README.md

Step 2 involves generating the expected Babel AST output file using the babelgen.js utility.

```bash
# If using the babelgen.js utility, run `npm install` first to get @babel/parser dependency.
node babelgen.js fixtures/my-test/input.js > fixtures/my-test/output.json
```

--------------------------------

### Profile the minifier on macOS

Source: https://github.com/swc-project/swc/blob/main/crates/swc_ecma_minifier/README.md

Run the instrumentation script on a directory of input files to profile the minifier.

```bash
./scripts/instrument/all.sh path/to/input/dir
```

--------------------------------

### Update and Verify swc_css_prefixer Fixtures

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc_css_prefixer crate.

```bash
UPDATE=1 cargo test -p swc_css_prefixer
```

```bash
cargo test -p swc_css_prefixer
```

--------------------------------

### Verify fixture tests

Source: https://github.com/swc-project/swc/blob/main/crates/jsdoc/AGENTS.md

Run this command to verify the fixture tests without updating the outputs.

```bash
cargo test -p jsdoc
```

--------------------------------

### Update fixture outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_xml_codegen/AGENTS.md

Run this command to update the generated fixture outputs for the swc_xml_codegen crate.

```bash
UPDATE=1 cargo test -p swc_xml_codegen
```

--------------------------------

### Update and Verify swc_plugin_backend_tests Fixtures

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc_plugin_backend_tests crate.

```bash
UPDATE=1 cargo test -p swc_plugin_backend_tests
```

```bash
cargo test -p swc_plugin_backend_tests
```

--------------------------------

### Update and verify swc_css_lints fixture tests

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc_css_lints crate.

```bash
UPDATE=1 cargo test -p swc_css_lints
```

```bash
cargo test -p swc_css_lints
```

--------------------------------

### Update and Verify swc_html_minifier Fixtures

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc_html_minifier crate.

```bash
UPDATE=1 cargo test -p swc_html_minifier
```

```bash
cargo test -p swc_html_minifier
```

--------------------------------

### Update fixture outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_plugin_backend_tests/AGENTS.md

Run this command to update the generated fixture outputs for the swc_plugin_backend_tests crate.

```bash
UPDATE=1 cargo test -p swc_plugin_backend_tests
```

--------------------------------

### Update fixture test outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_css_compat/AGENTS.md

Run this command to update the generated fixture outputs for the swc_css_compat crate.

```bash
UPDATE=1 cargo test -p swc_css_compat
```

--------------------------------

### Update and verify swc_bundler fixture tests

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc_bundler crate.

```bash
UPDATE=1 cargo test -p swc_bundler
```

```bash
cargo test -p swc_bundler
```

--------------------------------

### Update fixture outputs with UPDATE=1

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_codegen/AGENTS.md

Run this command to regenerate fixture outputs for the swc_html_codegen crate. Use it after adding or modifying fixtures, then verify with the test command below.

```bash
UPDATE=1 cargo test -p swc_html_codegen
```

--------------------------------

### Run execution tests

Source: https://github.com/swc-project/swc/blob/main/crates/swc_ecma_minifier/README.md

Execute the minifier's execution tests using the provided script.

```bash
./scripts/exec.sh
```

--------------------------------

### btrfs self replacement test

Source: https://github.com/swc-project/swc/blob/main/docs/native-addon-carriers-verification.md

Runs the btrfs_self_replacement test with SWC_TEST_VOLUME set. The mount command failed with 'sudo: a password is required'; workspace and temp paths are overlayfs.

```shell
SWC_TEST_VOLUME=... cargo test -p swc_native_addon --test platform btrfs_self_replacement -- --ignored --exact
```

```shell
sudo -n mount -o loop /tmp/swc-native-btrfs.img /tmp/swc-native-btrfs-volume
```

--------------------------------

### Run native addon tests

Source: https://github.com/swc-project/swc/blob/main/crates/swc_native_addon/VERIFICATION.md

Executes tests for the native addon crates, ignoring filesystem-dependent tests.

```bash
cargo test -p swc_native_addon -p swc_native_addon_pack -p binding_native_addon --target-dir target/native-node
```

--------------------------------

### Update and Verify swc_node_bundler Fixtures

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc_node_bundler crate.

```bash
UPDATE=1 cargo test -p swc_node_bundler
```

```bash
cargo test -p swc_node_bundler
```

--------------------------------

### Update fixture test outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_minifier/AGENTS.md

Run this command to update the generated fixture outputs for the swc_html_minifier crate.

```bash
UPDATE=1 cargo test -p swc_html_minifier
```

--------------------------------

### Update and Verify Fixture Tests for swc_ecma_transforms_compat

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the compatibility transformation crate.

```bash
UPDATE=1 cargo test -p swc_ecma_transforms_compat
```

```bash
cargo test -p swc_ecma_transforms_compat
```

--------------------------------

### Update and Verify swc_css_modules Fixtures

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc_css_modules crate.

```bash
UPDATE=1 cargo test -p swc_css_modules
```

```bash
cargo test -p swc_css_modules
```

--------------------------------

### Update and Verify Fixture Tests for swc_ecma_transforms_optimization

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the optimization transformation crate.

```bash
UPDATE=1 cargo test -p swc_ecma_transforms_optimization
```

```bash
cargo test -p swc_ecma_transforms_optimization
```

--------------------------------

### Update fixture outputs with UPDATE=1

Source: https://github.com/swc-project/swc/blob/main/crates/swc_ecma_transforms_proposal/AGENTS.md

Run this command to regenerate fixture outputs for the swc_ecma_transforms_proposal crate. Use it after modifying fixtures or expected outputs.

```bash
UPDATE=1 cargo test -p swc_ecma_transforms_proposal
```

--------------------------------

### Update and verify swc_css_codegen fixture tests

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc_css_codegen crate.

```bash
UPDATE=1 cargo test -p swc_css_codegen
```

```bash
cargo test -p swc_css_codegen
```

--------------------------------

### Update fixture outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_ecma_transforms_base/AGENTS.md

Run this command to update the generated fixture outputs for the crate.

```bash
UPDATE=1 cargo test -p swc_ecma_transforms_base
```

--------------------------------

### Update and Verify Fixture Tests for swc_ecma_transforms_proposal

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the proposal transforms crate.

```bash
UPDATE=1 cargo test -p swc_ecma_transforms_proposal
```

```bash
cargo test -p swc_ecma_transforms_proposal
```

--------------------------------

### Update and verify swc_core fixture tests

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc_core crate.

```bash
UPDATE=1 cargo test -p swc_core
```

```bash
cargo test -p swc_core
```

--------------------------------

### Verify swc_xml_parser tests

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Command to verify tests for the swc_xml_parser crate without updating fixtures.

```bash
cargo test -p swc_xml_parser
```

--------------------------------

### Find fixture harness

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Use ripgrep to locate the exact fixture harness before adding new test files.

```bash
rg -n "#\[(testing::)?fixture\(" tests src --glob "*.rs"
```

--------------------------------

### Run baseline verification

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Run these commands locally before finishing any task to ensure code formatting and linting standards are met.

```bash
cargo fmt --all
```

```bash
cargo clippy --all --all-targets -- -D warnings
```

--------------------------------

### Update and Verify swc_ecma_minifier Fixtures

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc_ecma_minifier crate.

```bash
UPDATE=1 cargo test -p swc_ecma_minifier
```

```bash
cargo test -p swc_ecma_minifier
```

--------------------------------

### Run filesystem tests on matching hosts

Source: https://github.com/swc-project/swc/blob/main/crates/swc_native_addon/README.md

Runs filesystem tests that require specific filesystem types. Set SWC_TEST_VOLUME to a writable path on the matching filesystem. These tests are ignored by default and must be run with --ignored.

```sh
SWC_TEST_VOLUME=/writable/apfs \
  cargo test -p swc_native_addon --test platform apfs_self_replacement -- --ignored --exact
SWC_TEST_VOLUME=/writable/btrfs \
  cargo test -p swc_native_addon --test platform btrfs_self_replacement -- --ignored --exact
cargo test -p swc_native_addon --test platform ntfs_compression -- --ignored --exact
cargo test -p swc_native_addon --test ntfs -- --ignored
```

--------------------------------

### Update fixture test outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_bundler/AGENTS.md

Run this command to update the generated fixture outputs for the swc_bundler crate.

```bash
UPDATE=1 cargo test -p swc_bundler
```

--------------------------------

### Update fixture outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_ts_fast_strip/AGENTS.md

Run this command to update the generated fixture outputs for the swc_ts_fast_strip crate.

```bash
UPDATE=1 cargo test -p swc_ts_fast_strip
```

--------------------------------

### Update fixture test outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_core/AGENTS.md

Run this command to automatically update the generated fixture outputs for the swc_core crate.

```bash
UPDATE=1 cargo test -p swc_core
```

--------------------------------

### Update and verify swc fixture tests

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc crate.

```bash
UPDATE=1 cargo test -p swc
```

```bash
cargo test -p swc
```

--------------------------------

### Update and Verify swc_css_parser Fixtures

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc_css_parser crate.

```bash
UPDATE=1 cargo test -p swc_css_parser
```

```bash
cargo test -p swc_css_parser
```

--------------------------------

### Update fixture outputs command

Source: https://github.com/swc-project/swc/blob/main/crates/swc_node_bundler/AGENTS.md

Use this command to automatically update the generated fixture outputs for the swc_node_bundler crate.

```bash
UPDATE=1 cargo test -p swc_node_bundler
```

--------------------------------

### Update fixture test outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc/AGENTS.md

Run this command to update the generated fixture outputs for the swc crate.

```bash
UPDATE=1 cargo test -p swc
```

--------------------------------

### Update fixture outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_css_minifier/AGENTS.md

Command to update the generated fixture outputs for the swc_css_minifier crate.

```bash
UPDATE=1 cargo test -p swc_css_minifier
```

--------------------------------

### Update and Verify Fixture Tests for swc_ecma_transforms_react

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the react transforms crate.

```bash
UPDATE=1 cargo test -p swc_ecma_transforms_react
```

```bash
cargo test -p swc_ecma_transforms_react
```

--------------------------------

### Update fixture test outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_parser/AGENTS.md

Run this command to update the generated fixture outputs for the swc_html_parser crate.

```bash
UPDATE=1 cargo test -p swc_html_parser
```

--------------------------------

### Update fixture outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_error_reporters/AGENTS.md

Run this command to automatically update the generated fixture outputs for the swc_error_reporters crate.

```bash
UPDATE=1 cargo test -p swc_error_reporters
```

--------------------------------

### Run crate-level verification

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Execute tests for a specific Rust crate.

```bash
cargo test -p <crate>
```

--------------------------------

### Update fixture outputs with UPDATE=1

Source: https://github.com/swc-project/swc/blob/main/crates/swc_ecma_transforms_compat/AGENTS.md

Run this command to regenerate fixture outputs after adding or modifying tests. The UPDATE=1 environment variable enables output updating.

```bash
UPDATE=1 cargo test -p swc_ecma_transforms_compat
```

--------------------------------

### Update and Verify swc_html_parser Fixtures

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc_html_parser crate.

```bash
UPDATE=1 cargo test -p swc_html_parser
```

```bash
cargo test -p swc_html_parser
```

--------------------------------

### Update and Verify Fixture Tests for swc_ecma_transforms_module

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the module transformation crate.

```bash
UPDATE=1 cargo test -p swc_ecma_transforms_module
```

```bash
cargo test -p swc_ecma_transforms_module
```

--------------------------------

### Update fixture outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_css_prefixer/AGENTS.md

Command to update the generated fixture outputs for the swc_css_prefixer crate.

```bash
UPDATE=1 cargo test -p swc_css_prefixer
```

--------------------------------

### Update and Verify swc_xml_codegen Fixtures

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc_xml_codegen crate.

```bash
UPDATE=1 cargo test -p swc_xml_codegen
```

```bash
cargo test -p swc_xml_codegen
```

--------------------------------

### Update fixture test outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_css_lints/AGENTS.md

Run this command to update the generated fixture outputs for the swc_css_lints crate.

```bash
UPDATE=1 cargo test -p swc_css_lints
```

--------------------------------

### Update fixture outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_ecma_codegen/AGENTS.md

Run this command to update the generated fixture outputs for the swc_ecma_codegen crate.

```bash
UPDATE=1 cargo test -p swc_ecma_codegen
```

--------------------------------

### Update and Verify swc_ts_fast_strip Fixtures

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc_ts_fast_strip crate.

```bash
UPDATE=1 cargo test -p swc_ts_fast_strip
```

```bash
cargo test -p swc_ts_fast_strip
```

--------------------------------

### Update fixture test outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_css_parser/AGENTS.md

Run this command to update the generated fixture outputs for the swc_css_parser crate.

```bash
UPDATE=1 cargo test -p swc_css_parser
```

--------------------------------

### Update and Verify swc_html_codegen Fixtures

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc_html_codegen crate.

```bash
UPDATE=1 cargo test -p swc_html_codegen
```

```bash
cargo test -p swc_html_codegen
```

--------------------------------

### Verify testing_macros tests

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Command to verify tests for the testing_macros crate without updating fixtures.

```bash
cargo test -p testing_macros
```

--------------------------------

### Update core known-fail baseline

Source: https://github.com/swc-project/swc/blob/main/crates/swc_ecma_parser/tests/flow-hermes/README.md

Run this script to regenerate known-fail-core.txt, which tracks current parser parity gaps for non-experimental fixtures.

```sh
./crates/swc_ecma_parser/scripts/update_flow_hermes_core_known_fail.sh
```

--------------------------------

### Let Declaration with Multiple Logs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_minifier/tests/fixture/element/script-group/output.min.html

Tests minification of a let declaration followed by multiple comma-separated logs.

```javascript
let a="test";console.log(a),console.log(a),console.log(a)let a="test";console.log(a),console.log(a),console.log(a)
```

--------------------------------

### Update and Verify Fixtures for swc_ecma_transforms_base

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update fixture outputs and verify tests for the swc_ecma_transforms_base crate.

```bash
UPDATE=1 cargo test -p swc_ecma_transforms_base
```

```bash
cargo test -p swc_ecma_transforms_base
```

--------------------------------

### Update and Verify Fixture Tests for swc_error_reporters

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the error reporters crate.

```bash
UPDATE=1 cargo test -p swc_error_reporters
```

```bash
cargo test -p swc_error_reporters
```

--------------------------------

### Update fixture test outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_typescript/AGENTS.md

Run this command to update the generated fixture outputs for the swc_typescript crate.

```bash
UPDATE=1 cargo test -p swc_typescript
```

--------------------------------

### Update fixture test outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_css_codegen/AGENTS.md

Run this command to update the generated fixture outputs for the swc_css_codegen crate.

```bash
UPDATE=1 cargo test -p swc_css_codegen
```

--------------------------------

### Update swc_xml_parser fixture outputs

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Command to update generated fixture outputs for the swc_xml_parser crate.

```bash
UPDATE=1 cargo test -p swc_xml_parser
```

--------------------------------

### Update and Verify Fixture Tests for swc_ecma_transforms_typescript

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the typescript transforms crate.

```bash
UPDATE=1 cargo test -p swc_ecma_transforms_typescript
```

```bash
cargo test -p swc_ecma_transforms_typescript
```

--------------------------------

### Verify activated fixture with cargo test

Source: https://github.com/swc-project/swc/blob/main/crates/swc_ecma_minifier/AGENTS.md

Run this command to verify the specific fixture test after removing an entry from the backlog lists.

```sh
cargo test -p swc_ecma_minifier --test compress fixture_tests__terser__compress__
```

--------------------------------

### Set environment variables

Source: https://github.com/swc-project/swc/blob/main/CONTRIBUTING.md

Configure environment variables required for running tests.

```bash
export RUST_BACKTRACE=full
export PATH="$PATH:$PWD/node_modules/.bin"
export RUST_MIN_STACK=16777216
```

--------------------------------

### Patch a local project with @swc/core

Source: https://github.com/swc-project/swc/blob/main/CONTRIBUTING.md

Run the patch script from the repository root to override a local project's @swc/core dependency with your local version.

```bash
./scripts/patch-project.sh /path/to/your/project
```

--------------------------------

### Update and Verify Fixtures for swc_ecma_transforms

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update fixture outputs and verify tests for the swc_ecma_transforms crate.

```bash
UPDATE=1 cargo test -p swc_ecma_transforms
```

```bash
cargo test -p swc_ecma_transforms
```

--------------------------------

### Update and Verify swc_typescript Fixtures

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc_typescript crate.

```bash
UPDATE=1 cargo test -p swc_typescript
```

```bash
cargo test -p swc_typescript
```

--------------------------------

### Add wasm32-wasip1 target

Source: https://github.com/swc-project/swc/blob/main/CONTRIBUTING.md

Add the required WebAssembly target using rustup.

```bash
rustup target add wasm32-wasip1
```

--------------------------------

### Update and verify jsdoc fixture tests

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the jsdoc crate.

```bash
UPDATE=1 cargo test -p jsdoc
```

```bash
cargo test -p jsdoc
```

--------------------------------

### Bundle React Native with Metro

Source: https://github.com/swc-project/swc/blob/main/crates/swc_sourcemap/tests/fixtures/react-native-metro/README.md

Use the npx react-native bundle command to generate a bundle and its corresponding sourcemap file.

```sh
$ npx react-native bundle --platform android --entry-file input.js --bundle-output output.js --sourcemap-output output.js.map
```

--------------------------------

### Update fixture test outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_ecma_parser/AGENTS.md

Run this command to automatically update the generated fixture outputs for the swc_ecma_parser crate.

```bash
UPDATE=1 cargo test -p swc_ecma_parser
```

--------------------------------

### Console Log and Let Declaration

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_minifier/tests/fixture/element/script-group/output.min.html

Tests minification of a console log followed by a let declaration and log.

```javascript
console.log("1")let test="1";console.log(test)
```

--------------------------------

### Update and Verify swc_ecma_parser Fixtures

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc_ecma_parser crate.

```bash
UPDATE=1 cargo test -p swc_ecma_parser
```

```bash
cargo test -p swc_ecma_parser
```

--------------------------------

### Update and Verify swc_ecma_lints Fixtures

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc_ecma_lints crate.

```bash
UPDATE=1 cargo test -p swc_ecma_lints
```

```bash
cargo test -p swc_ecma_lints
```

--------------------------------

### Run cargo clippy

Source: https://github.com/swc-project/swc/blob/main/crates/swc_native_addon/VERIFICATION.md

Runs clippy linting with strict warning enforcement.

```bash
cargo clippy -p swc_native_addon -p swc_native_addon_pack -p binding_native_addon --all-targets --target-dir target/native-lints -- -D warnings
```

--------------------------------

### Update fixture test outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_ecma_transforms_module/AGENTS.md

Run this command to update the generated fixture outputs for the swc_ecma_transforms_module crate.

```bash
UPDATE=1 cargo test -p swc_ecma_transforms_module
```

--------------------------------

### NTFS compression test command

Source: https://github.com/swc-project/swc/blob/main/crates/swc_native_addon/VERIFICATION.md

Test command for NTFS compression, unavailable without a Windows runtime.

```sh
cargo test -p swc_native_addon --test platform ntfs_compression -- --ignored --exact
```

--------------------------------

### Pre tag with leading spaces and indentation

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_codegen/tests/fixture/pre-tag/output.html

Shows how leading whitespace is preserved in the output.

```html
   



       Text
```

--------------------------------

### Full workspace clippy command

Source: https://github.com/swc-project/swc/blob/main/crates/swc_native_addon/VERIFICATION.md

Command run for all targets that failed due to missing submodules.

```sh
cargo clippy --all --all-targets -- -D warnings
```

--------------------------------

### Update and Verify swc_ecma_codegen Fixtures

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Commands to update generated fixture outputs and verify tests for the swc_ecma_codegen crate.

```bash
UPDATE=1 cargo test -p swc_ecma_codegen
```

```bash
cargo test -p swc_ecma_codegen
```

--------------------------------

### Pre tag with leading newlines and indentation

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_codegen/tests/fixture/pre-tag/output.html

Demonstrates handling of leading newlines followed by indented text.

```html





       Text
```

--------------------------------

### Run WASM binding tests

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Execute test scripts for specific WASM binding packages.

```bash
(cd bindings/binding_core_wasm && ./scripts/test.sh)
```

```bash
(cd bindings/binding_minifier_wasm && ./scripts/test.sh)
```

```bash
(cd bindings/binding_typescript_wasm && ./scripts/test.sh)
```

```bash
(cd bindings/binding_es_ast_viewer && ./scripts/test.sh)
```

--------------------------------

### Update testing_macros fixture outputs

Source: https://github.com/swc-project/swc/blob/main/CLAUDE.md

Command to update generated fixture outputs for the testing_macros crate.

```bash
UPDATE=1 cargo test -p testing_macros
```

--------------------------------

### Update fixture test outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_ecma_transforms_typescript/AGENTS.md

Run this command to update the generated fixture outputs for the swc_ecma_transforms_typescript crate.

```bash
UPDATE=1 cargo test -p swc_ecma_transforms_typescript
```

--------------------------------

### APFS self replacement test

Source: https://github.com/swc-project/swc/blob/main/docs/native-addon-carriers-verification.md

Runs the apfs_self_replacement test with SWC_TEST_VOLUME set. Linux has no APFS volume, macOS runtime, Apple SDK, /usr/bin/ditto, or /usr/bin/codesign; Mach-O execution and signing need a Mac host.

```shell
SWC_TEST_VOLUME=... cargo test -p swc_native_addon --test platform apfs_self_replacement -- --ignored --exact
```

--------------------------------

### Update fixture outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_ecma_lints/AGENTS.md

Command to update the generated fixture outputs for the swc_ecma_lints crate.

```bash
UPDATE=1 cargo test -p swc_ecma_lints
```

--------------------------------

### Var Declaration with Multiple Logs 2

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_minifier/tests/fixture/element/script-group/output.min.html

Tests minification of a var declaration followed by multiple comma-separated logs.

```javascript
var a="test";console.log(a),console.log(a),console.log(a)var a="test";console.log(a),console.log(a),console.log(a)var a="test";console.log(a),console.log(a),console.log(a)
```

--------------------------------

### Run carrier smoke suite with Node.js

Source: https://github.com/swc-project/swc/blob/main/crates/swc_native_addon/README.md

Runs the carrier smoke test using a specific Node.js binary. Set SWC_TEST_NODE to the absolute path of the Node.js executable.

```sh
SWC_TEST_NODE=/absolute/node-10.0.0/bin/node \
  cargo test -p binding_native_addon --test carrier
```

--------------------------------

### Update fixture test outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_css_modules/AGENTS.md

Use this command to automatically update the generated fixture outputs for the swc_css_modules crate.

```bash
UPDATE=1 cargo test -p swc_css_modules
```

--------------------------------

### Repeated console logs with let

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_minifier/tests/fixture/element/script-group/input.html

Tests minification of repeated console logs using let declarations.

```javascript
let a = "test";console.log(a);console.log(a);console.log(a); let a = "test";console.log(a);console.log(a);console.log(a);
```

--------------------------------

### Run full verification suite

Source: https://github.com/swc-project/swc/blob/main/crates/swc_native_addon/README.md

Updates submodules, runs tests for swc_native_addon packages, checks MSRV, formats, and lints. The MSRV script uses Rust 1.85 and copies private components into a temporary workspace, leaving the repository lockfile and configuration unchanged.

```sh
git submodule update --init --recursive
cargo test -p swc_native_addon -p swc_native_addon_pack -p binding_native_addon
python3 crates/swc_native_addon/scripts/msrv.py
cargo fmt --all
cargo clippy --all --all-targets -- -D warnings
```

--------------------------------

### Generate and compose sourcemaps with Hermes

Source: https://github.com/swc-project/swc/blob/main/crates/swc_sourcemap/tests/fixtures/react-native-hermes/README.md

Commands to bundle the React Native application, emit binary with Hermes, and compose the resulting sourcemaps.

```sh
    $ npx react-native bundle --platform android --entry-file input.js --bundle-output intermediate.js --sourcemap-output intermediate.js.map
    $ hermes -O -emit-binary -output-source-map -out=intermediate2 intermediate.js
    $ node react-native/scripts/compose-source-maps.js intermediate.js.map intermediate2.map -o output.map
```

--------------------------------

### Console Log and Var Declaration

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_minifier/tests/fixture/element/script-group/output.min.html

Tests minification of a console log followed by a var declaration and log.

```javascript
console.log("test")var b="test";console.log(b)
```

--------------------------------

### Var Declaration with Multiple Logs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_minifier/tests/fixture/element/script-group/output.min.html

Tests minification of a var declaration followed by multiple comma-separated logs.

```javascript
var a="test";console.log(a),console.log(a),console.log(a)var a="test";console.log(a),console.log(a),console.log(a)
```

--------------------------------

### Console Log and Var Declaration 2

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_minifier/tests/fixture/element/script-group/output.min.html

Tests minification of a console log followed by a var declaration and log.

```javascript
console.log("test")var a="test";console.log(a)
```

--------------------------------

### Mixed Let and Const Declarations

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_minifier/tests/fixture/element/script-group/output.min.html

Tests minification of mixed let and const declarations with logs.

```javascript
let a="test";console.log(a);const b="test";console.log("test")let a="test";console.log(a);const b="test";console.log("test")
```

--------------------------------

### Basic variable logging

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_minifier/tests/fixture/element/script-group/input.html

Tests minification of two sequential variable declarations and console logs.

```javascript
var a = "test";console.log(a) var b = "test";console.log(b)
```

--------------------------------

### Verify MSRV

Source: https://github.com/swc-project/swc/blob/main/crates/swc_native_addon/VERIFICATION.md

Checks the Minimum Supported Rust Version using the provided script.

```bash
python3 crates/swc_native_addon/scripts/msrv.py
```

--------------------------------

### Update fixture outputs

Source: https://github.com/swc-project/swc/blob/main/crates/jsdoc/AGENTS.md

Use this command to automatically update the generated fixture outputs for the jsdoc crate.

```bash
UPDATE=1 cargo test -p jsdoc
```

--------------------------------

### Define element-details and element-details-more custom elements

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_minifier/tests/fixture/text/slot/input.html

Registers two custom elements that attach shadow roots using templates identified by their IDs.

```javascript
customElements.define('element-details', class extends HTMLElement { constructor() { super(); const template = document .getElementById('element-details-template-1') .content; const shadowRoot = this.attachShadow({mode: 'open'}) .appendChild(template.cloneNode(true)); } }); customElements.define('element-details-more', class extends HTMLElement { constructor() { super(); const template = document .getElementById('element-details-template-2') .content; const shadowRoot = this.attachShadow({mode: 'open'}) .appendChild(template.cloneNode(true)); } });
```

--------------------------------

### Update fixture outputs

Source: https://github.com/swc-project/swc/blob/main/crates/swc_ecma_transforms/AGENTS.md

Command to update the generated fixture outputs for the swc_ecma_transforms crate.

```bash
UPDATE=1 cargo test -p swc_ecma_transforms
```

--------------------------------

### Run cross-target Rust clippy checks

Source: https://github.com/swc-project/swc/blob/main/docs/native-addon-carriers-verification.md

Executes cargo clippy for specified native addon packages across different targets. Requires ZSTD_SYS_USE_PKG_CONFIG and PKG_CONFIG_ALLOW_CROSS environment variables to be set.

```sh
ZSTD_SYS_USE_PKG_CONFIG=1 PKG_CONFIG_ALLOW_CROSS=1 \
  cargo clippy -p swc_native_addon -p binding_native_addon \
  -p swc_native_addon_pack --all-targets --target <TARGET> \
  --target-dir target/native-cross -- -D warnings
```

--------------------------------

### APFS self-replacement test command

Source: https://github.com/swc-project/swc/blob/main/crates/swc_native_addon/VERIFICATION.md

Test command for APFS self-replacement, unavailable on Linux hosts.

```sh
SWC_TEST_VOLUME=/writable/apfs cargo test -p swc_native_addon --test platform apfs_self_replacement -- --ignored --exact
```

--------------------------------

### Pre tag with multiple newlines and indentation

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_codegen/tests/fixture/pre-tag/output.html

Shows how the codegen handles blocks with significant leading whitespace and empty lines.

```html



   



       Text



   
```

--------------------------------

### Whitespace Collapse in Block Elements

Source: https://github.com/swc-project/swc/blob/main/crates/swc_html_minifier/tests/fixture/text/collapse-whitespace-all/input.html

Demonstrates whitespace handling within block-level elements.

```html
    foo
    
    baz
```
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