fix: mark some known globals or their functions as impure

src/ast/nodes/shared/knownGlobals.ts

@@ -94,7 +94,7 @@ const PC: GlobalDescription = {
 const ARRAY_TYPE: GlobalDescription = {
 	__proto__: null,
 	[ValueProperties]: PURE,
-	from: PF,
+	from: O,
 	of: PF,
 	prototype: O
 };
@@ -237,7 +237,7 @@ const knownGlobals: GlobalDescription = {
 		isFrozen: PF,
 		isSealed: PF,
 		keys: PF,
-		fromEntries: PF,
+		fromEntries: O,
 		entries: PF,
 		prototype: O
 	},
@@ -260,7 +260,7 @@ const knownGlobals: GlobalDescription = {
 	ReferenceError: PC,
 	Reflect: O,
 	RegExp: PC,
-	Set: PC,
+	Set: C,
 	SharedArrayBuffer: C,
 	String: {
 		__proto__: null,
@@ -300,8 +300,8 @@ const knownGlobals: GlobalDescription = {
 	unescape: PF,
 	URIError: PC,
 	valueOf: O,
-	WeakMap: PC,
-	WeakSet: PC,
+	WeakMap: C,
+	WeakSet: C,
 
 	// Additional globals shared by Node and Browser that are not strictly part of the language
 	clearInterval: C,

test/function/samples/tree-shake-iterable/_config.js

@@ -0,0 +1,3 @@
+module.exports = {
+	description: 'Retain functions that consume iterable'
+};

test/function/samples/tree-shake-iterable/main.js

@@ -0,0 +1,29 @@
+let effects = [];
+
+const iterable = {
+	[Symbol.iterator]() {
+		return {
+			next() {
+				effects.push('effect');
+				return { done: true };
+			}
+		};
+	}
+};
+
+new Map(iterable);
+new Set(iterable);
+new WeakMap(iterable);
+new WeakSet(iterable);
+Float32Array.from(iterable);
+Float64Array.from(iterable);
+Int16Array.from(iterable);
+Int32Array.from(iterable);
+Int8Array.from(iterable);
+Uint16Array.from(iterable);
+Uint32Array.from(iterable);
+Uint8Array.from(iterable);
+Uint8ClampedArray.from(iterable);
+Object.fromEntries(iterable);
+
+assert.equal(effects.length, 14);