New mangle.json / package.json configuration for Terser!

{
  // "minify" for Terser (https://github.com/terser-js/terser#minify-options-structure)
  // Note: works as a key in both package.json or mangle.json
  "minify": {
    // Legacy/convenient way to set mangle.properties.{regex,reserved}:
    "properties": "^_",
    "reserved": ["_dom", "_constructor"],

    // Optionally specify Terser compress configuration.
    // Supported values: https://github.com/terser-js/terser#compress-options
    "compress": {
      "hoist_vars": true,
      "reduce_funcs": false
    },

    // Optionally specify Terser mangle configuration
    // Supported values: https://github.com/terser-js/terser#mangle-options
    "mangle": {}
  }
}

🐧 new --define option! Inlines constants (great for Dead Code Elimination):

microbundle --define process.env.NODE_ENV=production,DEBUG=false

🐺 new --alias option! Remap imports from one module to another:

microbundle --alias react=preact,react-dom=preact

🦊 Lovely refactoring from @MatiasOlivera and @ForsakenHarmony :)

🦑 We turned minification up to 11!! (#321, thanks @jviide)

Breaking Changes

• Remove import pruning: #265 (thx @marvinhagemeister ❤️ )

(also added bors to not break master)

• Upstream fix: pin tiny-glob to 0.2.4 while we wait for a fix for terkelg/tiny-glob@cc4a295.

Possibly breaking

• Change default target to web & Don't minify by default for target == "node": #234 (me)
• Change "module" field from .m.js to .mjs: #213 (thx @Loilo ❤️ )

Features

• Add --jsx as a cli option to specify the pragma: #163 (thx @luxp ❤️ )
• Add --raw option to display the raw byte count: #174 (thx @andrewiggins ❤️ )
• Brotli sizes: #180 (thx @kristoferbaxter ❤️ )
• Supports --globals config (rename global dependencies): #186 (thx @Ayc0 ❤️ )
• Support TypeScript 3: #192 (thx @texastoland ❤️ )
• Migrate to terser from uglify-js: #137 (thx @Andarist and @chocolateboy ❤️ )
• Support for TypeScript sourcemaps: #227 (thx @alexbenic ❤️ )

Bugfixes / Patches

• Fix issue when using cwd and package.source: #176 (thx @gribnoysup ❤️ )

• Switch jest environment to node to fix tests: #179 (thx @gribnoysup ❤️ )

• Use async version of brotli-size (0.0.3): #182 (thx @developit ❤️ )

• Add cache folder for each format in typescript to fix a cache issue: (thx @alexbenic ❤️ )

• Don't compress microbundle dist: #231 (me)

• Updates for dependencies (thx @Greenkeeper[bot] 🙃 and @joelgallant ❤️ )

• Microbundle now uses the .mjs file extension for JS Module files, and will auto-detect them as source code.
• Update to the latest and greatest Rollup.

Special thanks to @Andarist and @ForsakenHarmony for their awesome work keeping Microbundle moving forward! 🙇‍♂️

• Breaking Change: --external all is now the default. Modules listed in your package.json's "dependencies" and "peerDependencies" will be linked as imports/require statements (thanks @Andarist)
• Importing subdirectories from packages now treats them as external (#83, thanks @Andarist)
• When builds fail, actually output some useful information (#120, thanks @jesstelford)
• Output much more helpful Rollup errors (#128, thanks @gribnoysup)
• Fix error reporting in watch mode and make fatal watch errors exit with an error code (#153, thanks @mattdesl)
• Minify CSS assets with cssnano (#121, thanks @nicksrandall)
• Add .tsx support! (thanks @jaredpalmer)
• Updated to Rollup 0.60+
• watch mode can now also be activated via a --watch flag (thanks @ngryman)

• New API: options.onBuild. You supply a function, it gets called on each build in watch mode (thanks @fwilkerson)
• Switch to rollup-plugin-typescript2 🔥 (thanks @freeman)
• Add --source-map option (use --no-source-map to disable them, thanks @cristianbote)

Changes & Features

• Switch to the latest typescript & fix issue with importHelpers (#69, thanks @tymondesigns)
• Switch to uglify-es by default for better compression!

Bugs Fixed

• Fix flowtype issue "Cannot read property 'code' of undefined" (#64, thanks @tlvince)
• Fix "Unknown plugin 'jsx'" (workaround until oligot/rollup-plugin-nodent#6 is merged)

• Fix Nodent JSX parsing (thanks @songawee)
• Show error details when compilation fails

• Support for TypeScript! (#16, thanks @tymondesigns!!)
• Support for scoped packages (#51, thanks @Andarist!)
• Simpler warnings for missing/erroneous package.json
• Fix acorn-jsx issue (we hope!)

• Detect when default & named exports are used in duplicate (eg: preact) and only export a single object.

Features

• Add support for JSX (+ --jsx pragma option) (#13, thanks @wcastand)
• Add support for tagged template strings (#29, thanks @rtorr)
• Add CSS support with PostCSS and Autoprefixer (#30, thanks @tknipfer)
• Switch to Sade for CLI handling (#32, thanks @lukeed)
• Fix --inline all option so it inlines modules from node_modules (#33, thanks @ColinRTaylor)
• Look for "browser" entries in package.json, add --target node option to bypass (#38, thanks @kevlened)
• Prefer "module" when importing from node_modules (#24, thanks @jescalan)
• Add "mangle" field to package.json to allow custom property mangling
• Add --name option to customize export name (#10, thanks @msfragala)
• Switch from snake_case to pascalCase for auto module names (#15, thanks @msfragala)

Bug Fixes

• Fix issues running under Windows (#21, thanks @g-plane)
• De-dupe entry files
• Avoid repeated CSS extraction