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rollup.config.js
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rollup.config.js
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import babel from '@rollup/plugin-babel'
import json from '@rollup/plugin-json'
import resolve from '@rollup/plugin-node-resolve'
import typescript from '@rollup/plugin-typescript'
import { dts } from 'rollup-plugin-dts'
import terser from '@rollup/plugin-terser'
import { visualizer } from 'rollup-plugin-visualizer'
import commonjs from '@rollup/plugin-commonjs'
import fs from 'fs'
import path from 'path'
const plugins = (es5) => [
json(),
resolve({ browser: true }),
typescript({ sourceMap: true, outDir: './dist' }),
commonjs(),
babel({
extensions: ['.js', '.jsx', '.ts', '.tsx'],
babelHelpers: 'bundled',
plugins: ['@babel/plugin-transform-nullish-coalescing-operator'],
presets: [
[
'@babel/preset-env',
{
targets: es5
? '>0.5%, last 2 versions, Firefox ESR, not dead, IE 11'
: '>0.5%, last 2 versions, Firefox ESR, not dead',
},
],
],
}),
terser({
toplevel: true,
compress: {
// 5 is the default if unspecified
ecma: es5 ? 5 : 6,
},
}),
]
const entrypoints = fs.readdirSync('./src/entrypoints')
const entrypointTargets = entrypoints.map((file) => {
const fileParts = file.split('.')
// pop the extension
fileParts.pop()
let format = fileParts[fileParts.length - 1]
// NOTE: Sadly we can't just use the file extensions as tsc won't compile things correctly
if (['cjs', 'es', 'iife'].includes(format)) {
fileParts.pop()
} else {
format = 'iife'
}
const fileName = fileParts.join('.')
const pluginsForThisFile = plugins(fileName.includes('es5'))
// we're allowed to console log in this file :)
// eslint-disable-next-line no-console
console.log(`Building ${fileName} in ${format} format`)
/** @type {import('rollup').RollupOptions} */
return {
input: `src/entrypoints/${file}`,
output: [
{
file: `dist/${fileName}.js`,
sourcemap: true,
format,
...(format === 'iife'
? {
name: 'posthog',
globals: {
preact: 'preact',
},
}
: {}),
...(format === 'cjs' ? { exports: 'auto' } : {}),
},
],
plugins: [...pluginsForThisFile, visualizer({ filename: `bundle-stats-${fileName}.html` })],
}
})
const typeTargets = entrypoints
.filter((file) => file.endsWith('.es.ts'))
.map((file) => {
const source = `./lib/src/entrypoints/${file.replace('.ts', '.d.ts')}`
/** @type {import('rollup').RollupOptions} */
return {
input: source,
output: [
{
dir: path.resolve('./dist'),
entryFileNames: file.replace('.es.ts', '.d.ts'),
},
],
plugins: [
json(),
dts({
exclude: [],
}),
],
}
})
export default [...entrypointTargets, ...typeTargets]