perf: initial start time (#168)

webpack · Apr 15, 2023 · 052b275 · 052b275
1 parent e90a2fc
commit 052b275
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Showing 2 changed files with 78 additions and 22 deletions.
diff --git a/declarations/validate.d.ts b/declarations/validate.d.ts
@@ -22,6 +22,32 @@ export type ValidationErrorConfiguration = {
   baseDataPath?: string | undefined;
   postFormatter?: PostFormatter | undefined;
 };
+/** @typedef {import("json-schema").JSONSchema4} JSONSchema4 */
+/** @typedef {import("json-schema").JSONSchema6} JSONSchema6 */
+/** @typedef {import("json-schema").JSONSchema7} JSONSchema7 */
+/** @typedef {import("ajv").ErrorObject} ErrorObject */
+/**
+ * @typedef {Object} Extend
+ * @property {string=} formatMinimum
+ * @property {string=} formatMaximum
+ * @property {string=} formatExclusiveMinimum
+ * @property {string=} formatExclusiveMaximum
+ * @property {string=} link
+ */
+/** @typedef {(JSONSchema4 | JSONSchema6 | JSONSchema7) & Extend} Schema */
+/** @typedef {ErrorObject & { children?: Array<ErrorObject>}} SchemaUtilErrorObject */
+/**
+ * @callback PostFormatter
+ * @param {string} formattedError
+ * @param {SchemaUtilErrorObject} error
+ * @returns {string}
+ */
+/**
+ * @typedef {Object} ValidationErrorConfiguration
+ * @property {string=} name
+ * @property {string=} baseDataPath
+ * @property {PostFormatter=} postFormatter
+ */
 /**
  * @param {Schema} schema
  * @param {Array<object> | object} options

diff --git a/src/validate.js b/src/validate.js
@@ -2,10 +2,57 @@ import addAbsolutePathKeyword from "./keywords/absolutePath";
 
 import ValidationError from "./ValidationError";
 
-// Use CommonJS require for ajv libs so TypeScript consumers aren't locked into esModuleInterop (see #110).
-const Ajv = require("ajv").default;
-const ajvKeywords = require("ajv-keywords").default;
-const addFormats = require("ajv-formats").default;
+/**
+ * @template T
+ * @param fn {(function(): any) | undefined}
+ * @returns {function(): T}
+ */
+const memoize = (fn) => {
+  let cache = false;
+  /** @type {T} */
+  let result;
+
+  return () => {
+    if (cache) {
+      return result;
+    }
+    result = /** @type {function(): any} */ (fn)();
+    cache = true;
+    // Allow to clean up memory for fn
+    // and all dependent resources
+    // eslint-disable-next-line no-undefined, no-param-reassign
+    fn = undefined;
+
+    return result;
+  };
+};
+
+const getAjv = memoize(() => {
+  // Use CommonJS require for ajv libs so TypeScript consumers aren't locked into esModuleInterop (see #110).
+  // eslint-disable-next-line global-require
+  const Ajv = require("ajv").default;
+  // eslint-disable-next-line global-require
+  const ajvKeywords = require("ajv-keywords").default;
+  // eslint-disable-next-line global-require
+  const addFormats = require("ajv-formats").default;
+
+  /**
+   * @type {Ajv}
+   */
+  const ajv = new Ajv({
+    strict: false,
+    allErrors: true,
+    verbose: true,
+    $data: true,
+  });
+
+  ajvKeywords(ajv, ["instanceof", "patternRequired"]);
+  addFormats(ajv, { keywords: true });
+  // Custom keywords
+  addAbsolutePathKeyword(ajv);
+
+  return ajv;
+});
 
 /** @typedef {import("json-schema").JSONSchema4} JSONSchema4 */
 /** @typedef {import("json-schema").JSONSchema6} JSONSchema6 */
@@ -39,23 +86,6 @@ const addFormats = require("ajv-formats").default;
  * @property {PostFormatter=} postFormatter
  */
 
-/**
- * @type {Ajv}
- */
-const ajv = new Ajv({
-  strict: false,
-  allErrors: true,
-  verbose: true,
-  $data: true,
-});
-
-ajvKeywords(ajv, ["instanceof", "patternRequired"]);
-
-addFormats(ajv, { keywords: true });
-
-// Custom keywords
-addAbsolutePathKeyword(ajv);
-
 /**
  * @param {Schema} schema
  * @param {Array<object> | object} options
@@ -106,7 +136,7 @@ function validate(schema, options, configuration) {
  * @returns {Array<SchemaUtilErrorObject>}
  */
 function validateObject(schema, options) {
-  const compiledSchema = ajv.compile(schema);
+  const compiledSchema = getAjv().compile(schema);
   const valid = compiledSchema(options);
 
   if (valid) return [];