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tsup.config.ts
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import {defineConfig, Options} from "tsup"
import fs from "fs"
export default defineConfig(options => {
const commonOptions: Partial<Options> = {
entry: {
immer: "src/immer.ts"
},
sourcemap: true,
...options
}
const productionOptions = {
minify: true,
esbuildOptions(options, _context) {
options.mangleProps = /_$/
},
define: {
"process.env.NODE_ENV": JSON.stringify("production")
}
}
return [
// ESM, standard bundler dev, embedded `process` references
{
...commonOptions,
format: ["esm"],
dts: true,
clean: true,
sourcemap: true,
onSuccess() {
// Support Flow types
fs.copyFileSync("src/types/index.js.flow", "dist/cjs/index.js.flow")
}
},
// ESM, Webpack 4 support. Target ES2018 syntax to compile away optional chaining and spreads
{
...commonOptions,
entry: {
"immer.legacy-esm": "src/immer.ts"
},
// ESBuild outputs `'.mjs'` by default for the 'esm' format. Force '.js'
outExtension: () => ({js: ".js"}),
target: "es2017",
format: ["esm"],
sourcemap: true
},
// ESM for use in browsers. Minified, with `process` compiled away
{
...commonOptions,
...productionOptions,
entry: {
"immer.production": "src/immer.ts"
},
format: ["esm"],
outExtension: () => ({js: ".mjs"})
},
// CJS development
{
...commonOptions,
entry: {
"immer.cjs.development": "src/immer.ts"
},
format: "cjs",
outDir: "./dist/cjs/"
},
// CJS production
{
...commonOptions,
...productionOptions,
entry: {
"immer.cjs.production": "src/immer.ts"
},
format: "cjs",
outDir: "./dist/cjs/",
onSuccess: () => {
// Write the CJS index file
fs.writeFileSync(
"dist/cjs/index.js",
`
'use strict'
if (process.env.NODE_ENV === 'production') {
module.exports = require('./immer.cjs.production.js')
} else {
module.exports = require('./immer.cjs.development.js')
}`
)
}
}
]
})