build flattened internal types instead of importing

index.d.ts

@@ -1,23 +1,205 @@
-import type { CustomEqualCreatorOptions } from './src/internalTypes';
-
-export type {
-  AnyEqualityComparator,
-  Cache,
-  CircularState,
-  ComparatorConfig,
-  CreateCustomComparatorConfig,
-  CreateState,
-  CustomEqualCreatorOptions,
-  DefaultState,
-  Dictionary,
-  EqualityComparator,
-  EqualityComparatorCreator,
-  InternalEqualityComparator,
-  PrimitiveWrapper,
-  State,
-  TypeEqualityComparator,
-  TypedArray,
-} from './src/internalTypes';
+/**
+ * Cache used to store references to objects, used for circular
+ * reference checks.
+ */
+export interface Cache<Key extends object, Value> {
+  delete(key: Key): boolean;
+  get(key: Key): Value | undefined;
+  set(key: Key, value: any): any;
+}
+
+export interface State<Meta> {
+  /**
+   * Cache used to identify circular references
+   */
+  readonly cache: Cache<any, any> | undefined;
+  /**
+   * Method used to determine equality of nested value.
+   */
+  readonly equals: InternalEqualityComparator<Meta>;
+  /**
+   * Additional value that can be used for comparisons.
+   */
+  meta: Meta;
+  /**
+   * Whether the equality comparison is strict, meaning it matches
+   * all properties (including symbols and non-enumerable properties)
+   * with equal shape of descriptors.
+   */
+  readonly strict: boolean;
+}
+
+export interface CircularState<Meta> extends State<Meta> {
+  readonly cache: Cache<any, any>;
+}
+
+export interface DefaultState<Meta> extends State<Meta> {
+  readonly cache: undefined;
+}
+
+export interface Dictionary<Value = any> {
+  [key: string | symbol]: Value;
+  $$typeof?: any;
+}
+
+export interface ComparatorConfig<Meta> {
+  /**
+   * Whether the arrays passed are equal in value. In strict mode, this includes
+   * additional properties added to the array.
+   */
+  areArraysEqual: TypeEqualityComparator<any, Meta>;
+  /**
+   * Whether the dates passed are equal in value.
+   */
+  areDatesEqual: TypeEqualityComparator<any, Meta>;
+  /**
+   * Whether the errors passed are equal in value.
+   */
+  areErrorsEqual: TypeEqualityComparator<any, Meta>;
+  /**
+   * Whether the functions passed are equal in value.
+   */
+  areFunctionsEqual: TypeEqualityComparator<any, Meta>;
+  /**
+   * Whether the maps passed are equal in value. In strict mode, this includes
+   * additional properties added to the map.
+   */
+  areMapsEqual: TypeEqualityComparator<any, Meta>;
+  /**
+   * Whether the numbers passed are equal in value.
+   */
+  areNumbersEqual: TypeEqualityComparator<any, Meta>;
+  /**
+   * Whether the objects passed are equal in value. In strict mode, this includes
+   * non-enumerable properties added to the map, as well as symbol properties.
+   */
+  areObjectsEqual: TypeEqualityComparator<any, Meta>;
+  /**
+   * Whether the primitive wrappers passed are equal in value.
+   */
+  arePrimitiveWrappersEqual: TypeEqualityComparator<any, Meta>;
+  /**
+   * Whether the regexps passed are equal in value.
+   */
+  areRegExpsEqual: TypeEqualityComparator<any, Meta>;
+  /**
+   * Whether the sets passed are equal in value. In strict mode, this includes
+   * additional properties added to the set.
+   */
+  areSetsEqual: TypeEqualityComparator<any, Meta>;
+  /**
+   * Whether the typed arrays passed are equal in value. In strict mode, this includes
+   * additional properties added to the typed array.
+   */
+  areTypedArraysEqual: TypeEqualityComparator<any, Meta>;
+  /**
+   * Whether the URLs passed are equal in value.
+   */
+  areUrlsEqual: TypeEqualityComparator<any, Meta>;
+}
+
+export type CreateCustomComparatorConfig<Meta> = (
+  config: ComparatorConfig<Meta>,
+) => Partial<ComparatorConfig<Meta>>;
+
+export type CreateState<Meta> = () => {
+  cache?: Cache<any, any> | undefined;
+  meta?: Meta;
+};
+
+export type EqualityComparator<Meta> = <A, B>(
+  a: A,
+  b: B,
+  state: State<Meta>,
+) => boolean;
+export type AnyEqualityComparator<Meta> = (
+  a: any,
+  b: any,
+  state: State<Meta>,
+) => boolean;
+
+export type EqualityComparatorCreator<Meta> = (
+  fn: EqualityComparator<Meta>,
+) => InternalEqualityComparator<Meta>;
+
+export type InternalEqualityComparator<Meta> = (
+  a: any,
+  b: any,
+  indexOrKeyA: any,
+  indexOrKeyB: any,
+  parentA: any,
+  parentB: any,
+  state: State<Meta>,
+) => boolean;
+
+// We explicitly check for primitive wrapper types
+// eslint-disable-next-line @typescript-eslint/ban-types
+export type PrimitiveWrapper = Boolean | Number | String;
+
+/**
+ * Type which encompasses possible instances of TypedArray
+ * classes.
+ *
+ * **NOTE**: This does not include `BigInt64Array` and
+ * `BitUint64Array` because those are part of ES2020 and
+ * not supported by certain TS configurations. If using
+ * either in `areTypedArraysEqual`, you can cast the
+ * instance as `TypedArray` and it will work as expected,
+ * because runtime checks will still work for those classes.
+ */
+export type TypedArray =
+  | Float32Array
+  | Float64Array
+  | Int8Array
+  | Int16Array
+  | Int32Array
+  | Uint16Array
+  | Uint32Array
+  | Uint8Array
+  | Uint8ClampedArray;
+
+export type TypeEqualityComparator<Type, Meta = undefined> = (
+  a: Type,
+  b: Type,
+  state: State<Meta>,
+) => boolean;
+
+export interface CustomEqualCreatorOptions<Meta> {
+  /**
+   * Whether circular references should be supported. It causes the
+   * comparison to be slower, but for objects that have circular references
+   * it is required to avoid stack overflows.
+   */
+  circular?: boolean;
+  /**
+   * Create a custom configuration of type-specific equality comparators.
+   * This receives the default configuration, which allows either replacement
+   * or supersetting of the default methods.
+   */
+  createCustomConfig?: CreateCustomComparatorConfig<Meta>;
+  /**
+   * Create a custom internal comparator, which is used as an override to the
+   * default entry point for nested value equality comparisons. This is often
+   * used for doing custom logic for specific types (such as handling a specific
+   * class instance differently than other objects) or to incorporate `meta` in
+   * the comparison. See the recipes for examples.
+   */
+  createInternalComparator?: (
+    compare: EqualityComparator<Meta>,
+  ) => InternalEqualityComparator<Meta>;
+  /**
+   * Create a custom `state` object passed between the methods. This allows for
+   * custom `cache` and/or `meta` values to be used.
+   */
+  createState?: CreateState<Meta>;
+  /**
+   * Whether the equality comparison is strict, meaning it matches
+   * all properties (including symbols and non-enumerable properties)
+   * with equal shape of descriptors.
+   */
+  strict?: boolean;
+}
+
 
 /**
  * Whether the values passed are strictly equal or both NaN.
@@ -68,4 +250,4 @@ export declare const strictCircularShallowEqual: <A, B>(a: A, b: B) => boolean;
  */
 export declare function createCustomEqual<Meta = undefined>(
   options?: CustomEqualCreatorOptions<Meta>,
-): <A, B>(a: A, b: B) => boolean;
+): <A, B>(a: A, b: B) => boolean;

package.json

@@ -87,10 +87,11 @@
   },
   "scripts": {
     "benchmark": "npm run build:esm && node benchmark/index.js",
-    "build": "npm run build:esm && npm run build:cjs && npm run build:umd && npm run build:min",
+    "build": "npm run build:esm && npm run build:cjs && npm run build:umd && npm run build:min && npm run build:types",
     "build:cjs": "rm -rf dist/cjs && NODE_ENV=production rollup -c config/rollup/config.cjs.js && tsc -p ./config/tsconfig/cjs.json",
     "build:esm": "rm -rf dist/esm && NODE_ENV=production rollup -c config/rollup/config.esm.js && tsc -p ./config/tsconfig/esm.json",
     "build:min": "rm -rf dist/min && NODE_ENV=production rollup -c config/rollup/config.min.js && tsc -p ./config/tsconfig/min.json",
+    "build:types": "node scripts/fallback-types.mjs",
     "build:umd": "rm -rf dist/umd && NODE_ENV=production rollup -c config/rollup/config.umd.js && tsc -p ./config/tsconfig/umd.json",
     "dev": "NODE_ENV=development webpack serve --progress --config=config/webpack.config.js",
     "format": "prettier **/*.ts --write",

scripts/fallback-types.mjs

@@ -0,0 +1,64 @@
+import fs from 'node:fs';
+import path from 'node:path';
+
+const METHODS = `
+/**
+ * Whether the values passed are strictly equal or both NaN.
+ */
+export declare const sameValueZeroEqual: <A, B>(a: A, b: B) => boolean;
+
+/**
+ * Whether the items passed are deeply-equal in value.
+ */
+export declare const deepEqual: <A, B>(a: A, b: B) => boolean;
+/**
+ * Whether the items passed are deeply-equal in value based on strict comparison.
+ */
+export declare const strictDeepEqual: <A, B>(a: A, b: B) => boolean;
+/**
+ * Whether the items passed are deeply-equal in value, including circular references.
+ */
+export declare const circularDeepEqual: <A, B>(a: A, b: B) => boolean;
+/**
+ * Whether the items passed are deeply-equal in value, including circular references,
+ * based on strict comparison.
+ */
+export declare const strictCircularDeepEqual: <A, B>(a: A, b: B) => boolean;
+/**
+ * Whether the items passed are shallowly-equal in value.
+ */
+export declare const shallowEqual: <A, B>(a: A, b: B) => boolean;
+/**
+ * Whether the items passed are shallowly-equal in value based on strict comparison
+ */
+export declare const strictShallowEqual: <A, B>(a: A, b: B) => boolean;
+/**
+ * Whether the items passed are shallowly-equal in value, including circular references.
+ */
+export declare const circularShallowEqual: <A, B>(a: A, b: B) => boolean;
+/**
+ * Whether the items passed are shallowly-equal in value, including circular references,
+ * based on strict comparison.
+ */
+export declare const strictCircularShallowEqual: <A, B>(a: A, b: B) => boolean;
+/**
+ * Create a custom equality comparison method.
+ *
+ * This can be done to create very targeted comparisons in extreme hot-path scenarios
+ * where the standard methods are not performant enough, but can also be used to provide
+ * support for legacy environments that cannot polyfill for modern features expected by
+ * \`fast-equals\`, such as \`WeakMap\` or \`RegExp.prototype.flags\`.
+ */
+export declare function createCustomEqual<Meta = undefined>(
+  options?: CustomEqualCreatorOptions<Meta>,
+): <A, B>(a: A, b: B) => boolean;
+`;
+
+const INTERNAL_TYPES = fs.readFileSync(
+  path.join(import.meta.dirname, '..', 'src', 'internalTypes.ts'),
+);
+
+const OUTPUT = `${INTERNAL_TYPES}\n${METHODS}`.trim();
+const OUTPUT_DESTINATION = path.join(import.meta.dirname, '..', 'index.d.ts');
+
+fs.writeFileSync(OUTPUT_DESTINATION, OUTPUT, 'utf-8');