feat: define inspect on dev mode only

Author: tanhauhau

packages/svelte/src/reactivity/date.js

@@ -1,3 +1,4 @@
+import { DEV } from 'esm-env';
 import { INSPECT_SYMBOL } from '../internal/client/constants.js';
 import { source, set } from '../internal/client/reactivity/sources.js';
 import { get } from '../internal/client/runtime.js';
@@ -89,6 +90,12 @@ export class ReactiveDate extends Date {
 					return v;
 				};
 			}
+
+			if (DEV) {
+				proto[INSPECT_SYMBOL] = function () {
+					get(this.#raw_time);
+				};
+			}
 		}
 	}
 
@@ -100,8 +107,4 @@ export class ReactiveDate extends Date {
 		super(...values);
 		this.#init();
 	}
-
-	[INSPECT_SYMBOL]() {
-		get(this.#raw_time);
-	}
 }

packages/svelte/src/reactivity/map.js

@@ -5,6 +5,8 @@ import { UNINITIALIZED } from '../constants.js';
 import { map } from './utils.js';
 import { INSPECT_SYMBOL } from '../internal/client/constants.js';
 
+var inited = false;
+
 /**
  * @template K
  * @template V
@@ -21,6 +23,21 @@ export class ReactiveMap extends Map {
 	constructor(value) {
 		super();
 
+		if (DEV) {
+			if (!inited) {
+				inited = true;
+				ReactiveMap.prototype[INSPECT_SYMBOL] = function () {
+					// changes could either introduced by
+					// - modifying the value, or
+					// - add / remove entries to the map
+					for (const [, source] of this.#sources) {
+						get(source);
+					}
+					get(this.#size);
+				};
+			}
+		}
+
 		// If the value is invalid then the native exception will fire here
 		if (DEV) new Map(value);
 
@@ -156,14 +173,4 @@ export class ReactiveMap extends Map {
 	get size() {
 		return get(this.#size);
 	}
-
-	[INSPECT_SYMBOL]() {
-		// changes could either introduced by
-		// - modifying the value, or
-		// - add / remove entries to the map
-		for (const [, source] of this.#sources) {
-			get(source);
-		}
-		get(this.#size);
-	}
 }

packages/svelte/src/reactivity/set.js

@@ -67,6 +67,12 @@ export class ReactiveSet extends Set {
 				return new ReactiveSet(set);
 			};
 		}
+
+		if (DEV) {
+			proto[INSPECT_SYMBOL] = function () {
+				get(this.#version);
+			};
+		}
 	}
 
 	#increment_version() {
@@ -151,7 +157,4 @@ export class ReactiveSet extends Set {
 	get size() {
 		return get(this.#size);
 	}
-	[INSPECT_SYMBOL]() {
-		get(this.#version);
-	}
 }