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app_vue/node_modules/eslint/lib/rules/utils/lazy-loading-rule-map.js

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+/**
+ * @fileoverview `Map` to load rules lazily.
+ * @author Toru Nagashima <https://github.com/mysticatea>
+ */
+"use strict";
+
+const debug = require("debug")("eslint:rules");
+
+/** @typedef {import("./types").Rule} Rule */
+
+/**
+ * The `Map` object that loads each rule when it's accessed.
+ * @example
+ * const rules = new LazyLoadingRuleMap([
+ *     ["eqeqeq", () => require("eqeqeq")],
+ *     ["semi", () => require("semi")],
+ *     ["no-unused-vars", () => require("no-unused-vars")],
+ * ])
+ *
+ * rules.get("semi") // call `() => require("semi")` here.
+ *
+ * @extends {Map<string, () => Rule>}
+ */
+class LazyLoadingRuleMap extends Map {
+
+    /**
+     * Initialize this map.
+     * @param {Array<[string, function(): Rule]>} loaders The rule loaders.
+     */
+    constructor(loaders) {
+        let remaining = loaders.length;
+
+        super(
+            debug.enabled
+                ? loaders.map(([ruleId, load]) => {
+                    let cache = null;
+
+                    return [
+                        ruleId,
+                        () => {
+                            if (!cache) {
+                                debug("Loading rule %o (remaining=%d)", ruleId, --remaining);
+                                cache = load();
+                            }
+                            return cache;
+                        }
+                    ];
+                })
+                : loaders
+        );
+
+        // `super(...iterable)` uses `this.set()`, so disable it here.
+        Object.defineProperty(LazyLoadingRuleMap.prototype, "set", {
+            configurable: true,
+            value: void 0
+        });
+    }
+
+    /**
+     * Get a rule.
+     * Each rule will be loaded on the first access.
+     * @param {string} ruleId The rule ID to get.
+     * @returns {Rule|undefined} The rule.
+     */
+    get(ruleId) {
+        const load = super.get(ruleId);
+
+        return load && load();
+    }
+
+    /**
+     * Iterate rules.
+     * @returns {IterableIterator<Rule>} Rules.
+     */
+    *values() {
+        for (const load of super.values()) {
+            yield load();
+        }
+    }
+
+    /**
+     * Iterate rules.
+     * @returns {IterableIterator<[string, Rule]>} Rules.
+     */
+    *entries() {
+        for (const [ruleId, load] of super.entries()) {
+            yield [ruleId, load()];
+        }
+    }
+
+    /**
+     * Call a function with each rule.
+     * @param {Function} callbackFn The callback function.
+     * @param {any} [thisArg] The object to pass to `this` of the callback function.
+     * @returns {void}
+     */
+    forEach(callbackFn, thisArg) {
+        for (const [ruleId, load] of super.entries()) {
+            callbackFn.call(thisArg, load(), ruleId, this);
+        }
+    }
+}
+
+// Forbid mutation.
+Object.defineProperties(LazyLoadingRuleMap.prototype, {
+    clear: { configurable: true, value: void 0 },
+    delete: { configurable: true, value: void 0 },
+    [Symbol.iterator]: {
+        configurable: true,
+        writable: true,
+        value: LazyLoadingRuleMap.prototype.entries
+    }
+});
+
+module.exports = { LazyLoadingRuleMap };