feat: add getTerserOptions with unsafeCompress option

Author: aminya

README.md

@@ -43,6 +43,32 @@ The config is adapted based on `NODE_ENV`, so make sure to run your scripts with
 
 **Note**: [`cross-env`](https://www.npmjs.com/package/cross-env) is an npm package that you need to install.
 
+## Options
+
+You can import the builder function to create a custom config:
+
+```ts
+import { getTerserOptions } from "terser-config-atomic/dist/index.js"
+module.exports = getTerserOptions(process.env.NODE_ENV, process.env.BABEL_ENV)
+```
+
+The builder function:
+
+```ts
+/**
+  Get the terser options for the given environment.
+
+  @param NODE_ENV - The Node environment (defaults to "production").
+  @param BABEL_ENV - The Babel environment (defaults to NODE_ENV).
+  @param unsafeCompress - Whether to use unsafe compression options (defaults to false).
+*/
+export function getTerserOptions(
+  NODE_ENV: string = "production",
+  BABEL_ENV: string | undefined = undefined,
+  unsafeCompress: boolean = false,
+)
+```
+
 ## Modifying the config
 
 To change the config use the following pattern:

__tests__/index.test.ts

@@ -1,5 +1,5 @@
 import assert from "assert"
-import { getTerserOptions } from "../src/get-terserrc"
+import { getTerserOptions } from "../src"
 
 describe("Terser-Config-Atomic", () => {
   it("production", () => {
@@ -13,7 +13,7 @@ describe("Terser-Config-Atomic", () => {
       "@atom.inSpecMode": "() => false",
       "@atom.inDevMode": "() => false",
     })
-    expect(TerserOptions.compress.passes).toBe(3)
+    expect(TerserOptions.compress.passes).toBe(2)
     expect(TerserOptions.mangle).toBe(true)
     expect(TerserOptions.format.beautify).toBe(false)
   })
@@ -40,7 +40,7 @@ describe("Terser-Config-Atomic", () => {
       "@atom.inSpecMode": "() => true",
       "@atom.inDevMode": "() => false",
     })
-    expect(TerserOptions.compress.passes).toBe(3)
+    expect(TerserOptions.compress.passes).toBe(2)
     expect(TerserOptions.mangle).toBe(false)
     expect(TerserOptions.format.beautify).toBe(true)
   })

src/.terserrc.ts

@@ -1,2 +1,2 @@
-import { getTerserOptions } from "./get-terserrc.js"
+import { getTerserOptions } from "./index.js"
 module.exports = getTerserOptions(process.env.NODE_ENV, process.env.BABEL_ENV)

src/get-terserrc.ts

@@ -0,0 +1,51 @@
+/**
+  Get the terser options for the given environment.
+
+  @param NODE_ENV - The Node environment (defaults to "production").
+  @param BABEL_ENV - The Babel environment (defaults to NODE_ENV).
+  @param unsafeCompress - Whether to use unsafe compression options (defaults to false).
+*/
+export function getTerserOptions(
+  NODE_ENV: string = "production",
+  BABEL_ENV: string | undefined = undefined,
+  unsafeCompress: boolean = false,
+) {
+  const isDev = NODE_ENV === "development"
+  const isTest = NODE_ENV === "test"
+  const isReadable = isDev || isTest
+
+  const ProductionCompress = {
+    global_defs: {
+      // remove dev and test specific code for production
+      "process.env.NODE_ENV": NODE_ENV || "production",
+      "process.env.BABEL_ENV": BABEL_ENV || NODE_ENV || "production",
+      "@atom.inSpecMode": !isTest ? "() => false" : "() => true",
+      "@atom.inDevMode": !isDev ? "() => false" : "() => true",
+    },
+    toplevel: unsafeCompress,
+    hoist_vars: false,
+    hoist_funs: true,
+    pure_getters: unsafeCompress || "strict",
+    unsafe: unsafeCompress,
+    unsafe_arrows: unsafeCompress,
+    unsafe_comps: unsafeCompress,
+    unsafe_Function: unsafeCompress,
+    unsafe_math: unsafeCompress,
+    unsafe_symbols: unsafeCompress,
+    unsafe_methods: unsafeCompress,
+    unsafe_proto: unsafeCompress,
+    unsafe_regexp: unsafeCompress,
+    unsafe_undefined: unsafeCompress,
+    passes: 2,
+  }
+
+  const TerserOptions = {
+    // "module": false, // controlled by Parcel
+    compress: isDev ? false : ProductionCompress,
+    mangle: isReadable ? false : true,
+    format: {
+      beautify: isReadable,
+    },
+  }
+  return TerserOptions
+}