eslint-plugin-better-tree-shaking

What?

Improve tree-shaking of your app/library by annotating top-level side-effects with /* @__PURE__ */ comment.

Examples

import FOO from './foo'

// accessing member's member
export const t1_wrong = FOO.bar.bazz // ❌
export const t1_correct = /* @__PURE__ */ (() => FOO.bar.bazz)() // ✅

// calling method
export const t2_wrong = FOO.bar() // ❌
export const t2_correct = /* @__PURE__ */ FOO.bar() // ✅

// calling function
export const t3_wrong = FOO() // ❌
export const t3_correct = /* @__PURE__ */ FOO() // ✅

// multiple side effects in object
export const t4_wrong = {
    a: FOO(),
    [FOO.bar.bazz]: FOO.bar(),
    c: FOO.bar.bazz,
} // ❌

export const t4_correct = /* @__PURE__ */ (() => ({
    a: FOO(),
    [FOO.bar.bazz]: FOO.bar(),
    c: FOO.bar.bazz,
}))() // ✅

// accessing implicit global variable's member
export const t5_wrong = SOME_GLOBAL.FOO // ❌
export const t5_correct = /* @__PURE__ */ (() => SOME_GLOBAL.FOO)() // ✅

// calling implicit global variable's method
export const t6_wrong = SOME_GLOBAL.FOO() // ❌
export const t6_correct = /* @__PURE__ */ SOME_GLOBAL.FOO() // ✅

Install

npm i -D eslint-plugin-better-tree-shaking

Setup with ESLint

Step 1: Add the plugin in ESLint Config

Add "better-tree-shaking" to the plugins section of your ESLint configuration file.

{
    "plugins": ["better-tree-shaking"]
}

Step 2: Add the Plugin's rule

Add the "better-tree-shaking/no-top-level-side-effects" rule in your ESLint config file as shown below

"rules": {
    "better-tree-shaking/no-top-level-side-effects": "error"
}

Licence

MIT