fix: backport old logic from v3

declarations/validate.d.ts

@@ -3,10 +3,10 @@ export type JSONSchema6 = import("json-schema").JSONSchema6;
 export type JSONSchema7 = import("json-schema").JSONSchema7;
 export type ErrorObject = import("ajv").ErrorObject;
 export type Extend = {
-  formatMinimum?: string | undefined;
-  formatMaximum?: string | undefined;
-  formatExclusiveMinimum?: string | undefined;
-  formatExclusiveMaximum?: string | undefined;
+  formatMinimum?: (string | number) | undefined;
+  formatMaximum?: (string | number) | undefined;
+  formatExclusiveMinimum?: (string | boolean) | undefined;
+  formatExclusiveMaximum?: (string | boolean) | undefined;
   link?: string | undefined;
   undefinedAsNull?: boolean | undefined;
 };

src/keywords/limit.js

@@ -0,0 +1,158 @@
+/** @typedef {import("ajv").default} Ajv */
+/** @typedef {import("ajv").Code} Code */
+/** @typedef {import("ajv").Name} Name */
+/** @typedef {import("ajv").KeywordErrorDefinition} KeywordErrorDefinition */
+
+/**
+ * @param {Ajv} ajv
+ * @returns {Ajv}
+ */
+function addLimitKeyword(ajv) {
+  // eslint-disable-next-line global-require
+  const { _, str, KeywordCxt, nil, Name } = require("ajv");
+
+  /**
+   * @param {Code | Name} x
+   * @returns {Code | Name}
+   */
+  function par(x) {
+    return x instanceof Name ? x : _`(${x})`;
+  }
+
+  /**
+   * @param {Code} op
+   * @returns {function(Code, Code): Code}
+   */
+  function mappend(op) {
+    return (x, y) =>
+      x === nil ? y : y === nil ? x : _`${par(x)} ${op} ${par(y)}`;
+  }
+
+  const orCode = mappend(_`||`);
+
+  // boolean OR (||) expression with the passed arguments
+  /**
+   * @param {...Code} args
+   * @returns {Code}
+   */
+  function or(...args) {
+    return args.reduce(orCode);
+  }
+
+  /**
+   * @param {string | number} key
+   * @returns {Code}
+   */
+  function getProperty(key) {
+    return _`[${key}]`;
+  }
+
+  const keywords = {
+    formatMaximum: { okStr: "<=", ok: _`<=`, fail: _`>` },
+    formatMinimum: { okStr: ">=", ok: _`>=`, fail: _`<` },
+    formatExclusiveMaximum: { okStr: "<", ok: _`<`, fail: _`>=` },
+    formatExclusiveMinimum: { okStr: ">", ok: _`>`, fail: _`<=` },
+  };
+
+  /** @type {KeywordErrorDefinition} */
+  const error = {
+    message: ({ keyword, schemaCode }) =>
+      str`should be ${
+        keywords[/** @type {keyof typeof keywords} */ (keyword)].okStr
+      } ${schemaCode}`,
+    params: ({ keyword, schemaCode }) =>
+      _`{comparison: ${
+        keywords[/** @type {keyof typeof keywords} */ (keyword)].okStr
+      }, limit: ${schemaCode}}`,
+  };
+
+  for (const keyword of Object.keys(keywords)) {
+    ajv.addKeyword({
+      keyword,
+      type: "string",
+      schemaType: keyword.startsWith("formatExclusive")
+        ? ["string", "boolean"]
+        : ["string", "number"],
+      $data: true,
+      error,
+      code(cxt) {
+        const { gen, data, schemaCode, keyword, it } = cxt;
+        const { opts, self } = it;
+        if (!opts.validateFormats) return;
+        const fCxt = new KeywordCxt(
+          it,
+          /** @type {any} */
+          (self.RULES.all.format).definition,
+          "format"
+        );
+
+        /**
+         * @param {Name} fmt
+         * @returns {Code}
+         */
+        function compareCode(fmt) {
+          return _`${fmt}.compare(${data}, ${schemaCode}) ${
+            keywords[/** @type {keyof typeof keywords} */ (keyword)].fail
+          } 0`;
+        }
+
+        function validate$DataFormat() {
+          const fmts = gen.scopeValue("formats", {
+            ref: self.formats,
+            code: opts.code.formats,
+          });
+          const fmt = gen.const("fmt", _`${fmts}[${fCxt.schemaCode}]`);
+
+          cxt.fail$data(
+            or(
+              _`typeof ${fmt} != "object"`,
+              _`${fmt} instanceof RegExp`,
+              _`typeof ${fmt}.compare != "function"`,
+              compareCode(fmt)
+            )
+          );
+        }
+
+        function validateFormat() {
+          const format = fCxt.schema;
+          const fmtDef = self.formats[format];
+
+          if (!fmtDef || fmtDef === true) {
+            return;
+          }
+
+          if (
+            typeof fmtDef !== "object" ||
+            fmtDef instanceof RegExp ||
+            typeof fmtDef.compare !== "function"
+          ) {
+            throw new Error(
+              `"${keyword}": format "${format}" does not define "compare" function`
+            );
+          }
+
+          const fmt = gen.scopeValue("formats", {
+            key: format,
+            ref: fmtDef,
+            code: opts.code.formats
+              ? _`${opts.code.formats}${getProperty(format)}`
+              : undefined,
+          });
+
+          cxt.fail$data(compareCode(fmt));
+        }
+
+        if (fCxt.$data) {
+          validate$DataFormat();
+        } else {
+          validateFormat();
+        }
+      },
+      dependencies: ["format"],
+    });
+  }
+
+  return ajv;
+}
+
+export default addLimitKeyword;

src/validate.js

@@ -21,14 +21,20 @@ const getAjv = memoize(() => {
   });
 
   ajvKeywords(ajv, ["instanceof", "patternRequired"]);
-  addFormats(ajv, { keywords: true });
+  // TODO set `{ keywords: true }` for the next major release and remove `keywords/limit.js`
+  addFormats(ajv, { keywords: false });
 
   // Custom keywords
   // eslint-disable-next-line global-require
   const addAbsolutePathKeyword = require("./keywords/absolutePath").default;
 
   addAbsolutePathKeyword(ajv);
 
+  // eslint-disable-next-line global-require
+  const addLimitKeyword = require("./keywords/limit").default;
+
+  addLimitKeyword(ajv);
+
   const addUndefinedAsNullKeyword =
     // eslint-disable-next-line global-require
     require("./keywords/undefinedAsNull").default;
@@ -45,10 +51,10 @@ const getAjv = memoize(() => {
 
 /**
  * @typedef {Object} Extend
- * @property {string=} formatMinimum
- * @property {string=} formatMaximum
- * @property {string=} formatExclusiveMinimum
- * @property {string=} formatExclusiveMaximum
+ * @property {(string | number)=} formatMinimum
+ * @property {(string | number)=} formatMaximum
+ * @property {(string | boolean)=} formatExclusiveMinimum
+ * @property {(string | boolean)=} formatExclusiveMaximum
  * @property {string=} link
  * @property {boolean=} undefinedAsNull
  */