Open hysryt opened 3 years ago
hysryt
commented
3 years ago https://esbuild.github.io/faq/#why-is-esbuild-fast
Goで記述され、ネイティブコードにコンパイルされている。 webpack も rollup も percel も JavaScript製。
Goは並列処理が得意とのこと。 コアを可能な限り有効活用することで速度を上げている。
ライブラリも使わず全て一から書いている。 依存関係がないのでインストールも速い。
TypeScriptのコンパイラも公式のものではなく一から作っている。 → 構文レベルの新機能が出てもすぐには使えない？
メモリのデータをあまり触らない（CPUキャッシュで済むように）ように組んでいるとのこと。 Goは省メモリらしい。
hysryt
commented
3 years ago % npx esbuild -h
Usage:
esbuild [options] [entry points]
Documentation:
https://esbuild.github.io/
Repository:
https://github.com/evanw/esbuild
Simple options:
--bundle Bundle all dependencies into the output files
--define:K=V Substitute K with V while parsing
--external:M Exclude module M from the bundle (can use * wildcards)
--format=... Output format (iife | cjs | esm, no default when not
bundling, otherwise default is iife when platform
is browser and cjs when platform is node)
--loader:X=L Use loader L to load file extension X, where L is
one of: js | jsx | ts | tsx | json | text | base64 |
file | dataurl | binary
--minify Minify the output (sets all --minify-* flags)
--outdir=... The output directory (for multiple entry points)
--outfile=... The output file (for one entry point)
--platform=... Platform target (browser | node | neutral,
default browser)
--serve=... Start a local HTTP server on this host:port for outputs
--sourcemap Emit a source map
--splitting Enable code splitting (currently only for esm)
--target=... Environment target (e.g. es2017, chrome58, firefox57,
safari11, edge16, node10, default esnext)
--watch Watch mode: rebuild on file system changes
Advanced options:
--banner:T=... Text to be prepended to each output file of type T
where T is one of: css | js
--charset=utf8 Do not escape UTF-8 code points
--color=... Force use of color terminal escapes (true | false)
--log-limit=... Maximum message count or 0 to disable (default 10)
--footer:T=... Text to be appended to each output file of type T
where T is one of: css | js
--global-name=... The name of the global for the IIFE format
--inject:F Import the file F into all input files and
automatically replace matching globals with imports
--jsx-factory=... What to use for JSX instead of React.createElement
--jsx-fragment=... What to use for JSX instead of React.Fragment
--keep-names Preserve "name" on functions and classes
--log-level=... Disable logging (info | warning | error | silent,
default info)
--main-fields=... Override the main file order in package.json
(default "browser,module,main" when platform is
browser and "main,module" when platform is node)
--metafile=... Write metadata about the build to a JSON file
--minify-whitespace Remove whitespace in output files
--minify-identifiers Shorten identifiers in output files
--minify-syntax Use equivalent but shorter syntax in output files
--out-extension:.js=.mjs Use a custom output extension instead of ".js"
--outbase=... The base path used to determine entry point output
paths (for multiple entry points)
--preserve-symlinks Disable symlink resolution for module lookup
--public-path=... Set the base URL for the "file" loader
--pure:N Mark the name N as a pure function for tree shaking
--resolve-extensions=... A comma-separated list of implicit extensions
(default ".tsx,.ts,.jsx,.js,.css,.json")
--servedir=... What to serve in addition to generated output files
--sourcefile=... Set the source file for the source map (for stdin)
--sourcemap=external Do not link to the source map with a comment
--sourcemap=inline Emit the source map with an inline data URL
--sources-content=false Omit "sourcesContent" in generated source maps
--tree-shaking=... Set to "ignore-annotations" to work with packages
that have incorrect tree-shaking annotations
--tsconfig=... Use this tsconfig.json file instead of other ones
--version Print the current version (0.9.2) and exit
Examples:
# Produces dist/entry_point.js and dist/entry_point.js.map
esbuild --bundle entry_point.js --outdir=dist --minify --sourcemap
# Allow JSX syntax in .js files
esbuild --bundle entry_point.js --outfile=out.js --loader:.js=jsx
# Substitute the identifier RELEASE for the literal true
esbuild example.js --outfile=out.js --define:RELEASE=true
# Provide input via stdin, get output via stdout
esbuild --minify --loader=ts < input.ts > output.js
# Automatically rebuild when input files are changed
esbuild app.ts --bundle --watch
# Start a local HTTP server for everything in "www"
esbuild app.ts --bundle --servedir=www --outdir=www/js
https://github.com/evanw/esbuild JavaScriptのバンドラー。 同様の機能を持つ webpack や rollup よりも高速らしい。