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typeson.js
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typeson.js
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/**
* @file Typeson - JSON with types.
* @license The MIT License (MIT)
* @copyright (c) 2016-2018 David Fahlander, Brett Zamir
*/
/**
* @typedef {number} Integer
*/
/**
* @typedef {object} StateObject
* @property {string} [type]
* @property {boolean} [replaced]
* @property {"object"|"array"} [iterateIn]
* @property {boolean} [iterateUnsetNumeric]
* @property {boolean} [addLength]
* @property {boolean} [ownKeys]
*/
/**
* @callback Tester
* @param {any} value
* @param {StateObject} stateobj
* @returns {boolean}
*/
/**
* @callback Replacer
* @param {any} value
* @param {StateObject} stateObj
* @returns {any} Should be JSON-stringifiable
*/
/**
* @callback AsyncReplacer
* @param {any} value
* @param {StateObject} stateObj
* @returns {TypesonPromise<any>} Should be JSON-stringifiable
*/
/**
* @callback Reviver
* @param {any} value May not be JSON if processed already by another type
* @param {StateObject} stateObj
* @returns {any}
*/
/**
* @callback AsyncReviver
* @param {any} value May not be JSON if processed already by another type
* @param {StateObject} stateObj
* @returns {TypesonPromise<any>|Promise<any>}
*/
/**
* @typedef {{
* testPlainObjects?: boolean,
* test?: Tester,
* replace?: Replacer,
* replaceAsync?: AsyncReplacer,
* revive?: Reviver,
* reviveAsync?: AsyncReviver
* }} Spec
*/
/**
* @typedef {{
* [key: string]:
* Spec|Function|[Tester, Replacer, Reviver?]|(new () => any)|null
* }} TypeSpecSet
*/
/**
* @typedef {(TypeSpecSet|Preset)[]} Preset
*/
/**
* @typedef {import(
* './utils/classMethods.js'
* ).ObjectTypeString} ObjectTypeString
*/
/**
* @typedef {{
* type: string,
* test: (val: any, stateObj: StateObject) => boolean,
* replace?: Replacer,
* replaceAsync?: AsyncReplacer
* }} ReplacerObject
*/
/**
* @typedef {{
* revive?: Reviver,
* reviveAsync?: AsyncReviver
* }} ReviverObject
*/
import {TypesonPromise} from './utils/TypesonPromise.js';
import {
isPlainObject, isObject, hasConstructorOf,
isThenable,
escapeKeyPathComponent,
getByKeyPath, setAtKeyPath, getJSONType
} from './utils/classMethods.js';
const {keys, hasOwn} = Object,
{isArray} = Array,
// eslint-disable-next-line @stylistic/max-len -- Long
/** @type {("type"|"replaced"|"iterateIn"|"iterateUnsetNumeric"|"addLength")[]} */
internalStateObjPropsToIgnore = [
'type', 'replaced', 'iterateIn', 'iterateUnsetNumeric', 'addLength'
];
/**
* @typedef {object} PlainObjectType
* @property {string} keypath
* @property {string} type
*/
/**
* Handle plain object revivers first so reference setting can use
* revived type (e.g., array instead of object); assumes revived
* has same structure or will otherwise break subsequent references.
* @param {PlainObjectType} a
* @param {PlainObjectType} b
* @returns {1|-1|0}
*/
function nestedPathsFirst (a, b) {
if (a.keypath === '') {
return -1;
}
let as = a.keypath.match(/\./gu) ?? 0;
let bs = b.keypath.match(/\./gu) ?? 0;
if (as) {
as = /** @type {RegExpMatchArray} */ (as).length;
}
if (bs) {
bs = /** @type {RegExpMatchArray} */ (bs).length;
}
return as > bs
? -1
: as < bs
? 1
: a.keypath < b.keypath
? -1
: a.keypath > b.keypath
? 1
// Keypath should never be the same
/* c8 ignore next 1 */
: 0;
}
/**
* @typedef {object} KeyPathEvent
* @property {string} [cyclicKeypath]
*/
/**
* @typedef {object} EndIterateInEvent
* @property {boolean} [endIterateIn]
* @property {boolean} [end]
*/
/**
* @typedef {{
* endIterateOwn?: boolean
* }} EndIterateOwnEvent
*/
/**
* @typedef {object} EndIterateUnsetNumericEvent
* @property {boolean} [endIterateUnsetNumeric]
* @property {boolean} [end]
*/
/**
* @typedef {object} TypeDetectedEvent
* @property {boolean} [typeDetected]
*/
/**
* @typedef {object} ReplacingEvent
* @property {boolean} [replacing]
*/
/**
* @typedef {[
* keyPath: string,
* value: object|Array<any>|TypesonPromise<any>,
* cyclic: boolean|"readonly"|undefined,
* stateObj: StateObject,
* clone: {[key: (string|Integer)]: any}|undefined,
* key: string|Integer|undefined,
* stateObjType: string|undefined
* ][]} PromisesData
*/
/**
* @typedef {KeyPathEvent & EndIterateInEvent & EndIterateOwnEvent &
* EndIterateUnsetNumericEvent &
* TypeDetectedEvent & ReplacingEvent & {} & {
* replaced?: any
* } & {
* clone?: {[key: string]: any}
* } & {
* keypath: string,
* value: any,
* cyclic: boolean|undefined|"readonly",
* stateObj: StateObject,
* promisesData: PromisesData,
* resolvingTypesonPromise: ?boolean|undefined,
* awaitingTypesonPromise: boolean
* } & {type: string}} ObserverData
*/
/**
* @typedef {(data: ObserverData) => void} EncapsulateObserver
*/
/**
* @callback Observer
* @param {KeyPathEvent|EndIterateInEvent|EndIterateOwnEvent|
* EndIterateUnsetNumericEvent|
* TypeDetectedEvent|ReplacingEvent} [event]
* @returns {void}
*/
/**
* @typedef {object} TypesonOptions
* @property {boolean} [stringification] Auto-set by `stringify`
* @property {boolean} [parse] Auto-set by `parse`
* @property {boolean} [sync] Can be overridden when auto-set by
* `encapsulate` and `revive`.
* @property {boolean} [returnTypeNames] Auto-set by `specialTypeNames`
* @property {boolean} [iterateNone] Auto-set by `rootTypeName`
* @property {boolean} [cyclic]
* @property {boolean} [throwOnBadSyncType] Auto-set by `stringifyAsync`,
* `stringifySync`, `parseSync`, `parseAsync`, `encapsulateSync`,
* `encapsulateAync`, `reviveSync`, `reviveAsync`
* @property {number|boolean} [fallback] `true` sets to 0. Default is
* positive infinity. Used within `register`
* @property {EncapsulateObserver} [encapsulateObserver]
*/
/**
* An instance of this class can be used to call `stringify()` and `parse()`.
* Typeson resolves cyclic references by default. Can also be extended to
* support custom types using the register() method.
*
* @class
* @param {{cyclic: boolean}} [options] - if cyclic (default true),
* cyclic references will be handled gracefully.
*/
class Typeson {
/**
* @param {TypesonOptions} [options]
*/
constructor (options) {
this.options = options;
// Replacers signature: replace (value). Returns falsy if not
// replacing. Otherwise ['Date', value.getTime()]
/** @type {ReplacerObject[]} */
this.plainObjectReplacers = [];
/** @type {ReplacerObject[]} */
this.nonplainObjectReplacers = [];
// Revivers: [{type => reviver}, {plain: boolean}].
// Sample: [{'Date': value => new Date(value)}, {plain: false}]
/**
* @type {{
* [key: string]: [
* ReviverObject|undefined,
* {plain: boolean|undefined}
* ]|undefined}}
*/
this.revivers = {};
/** Types registered via `register()`. */
/** @type {TypeSpecSet} */
this.types = {};
}
/**
* @typedef {null|boolean|number|string} Primitive
*/
/**
* @typedef {Primitive|Primitive[]|{[key: string]: JSON}} JSON
*/
/**
* @callback JSONReplacer
* @param {""|string} key
* @param {JSON} value
* @returns {any}
* @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify#The%20replacer%20parameter
*/
/**
* Serialize given object to Typeson.
* Initial arguments work identical to those of `JSON.stringify`.
* The `replacer` argument has nothing to do with our replacers.
* @param {any} obj
* @param {?(JSONReplacer|string[]|undefined)} [replacer]
* @param {number|string|null|undefined} [space]
* @param {TypesonOptions} [opts]
* @returns {string|Promise<string>} Promise resolves to a string
*/
stringify (obj, replacer, space, opts) {
opts = {...this.options, ...opts, stringification: true};
const encapsulated = this.encapsulate(obj, null, opts);
if (isArray(encapsulated)) {
return JSON.stringify(
encapsulated[0],
// Casting type due to error in JSON.stringify type
// not accepting `null`
/** @type {JSONReplacer|undefined} */ (replacer),
/** @type {string|number|undefined} */ (space)
);
}
return /** @type {Promise<string>} */ (encapsulated).then((res) => {
return JSON.stringify(
res,
// Casting type due to error in JSON.stringify type
/** @type {JSONReplacer|undefined} */ (replacer),
/** @type {string|number|undefined} */ (space)
);
});
}
/**
* Also sync but throws on non-sync result.
* @param {any} obj
* @param {?(JSONReplacer|string[]|undefined)} [replacer]
* @param {number|string} [space]
* @param {TypesonOptions} [opts]
* @returns {string}
*/
stringifySync (obj, replacer, space, opts) {
return /** @type {string} */ (this.stringify(obj, replacer, space, {
throwOnBadSyncType: true, ...opts, sync: true
}));
}
/**
*
* @param {any} obj
* @param {JSONReplacer|string[]|null|undefined} [replacer]
* @param {number|string|null|undefined} [space]
* @param {TypesonOptions} [opts]
* @returns {Promise<string>}
*/
stringifyAsync (obj, replacer, space, opts) {
return /** @type {Promise<string>} */ (
this.stringify(obj, replacer, space, {
throwOnBadSyncType: true, ...opts, sync: false
})
);
}
/**
* @callback JSONReviver
* @param {string} key
* @param {JSON} value
* @returns {JSON}
*/
/**
* Parse Typeson back into an obejct.
* Initial arguments works identical to those of `JSON.parse()`.
* @param {string} text
* @param {?JSONReviver} [reviver] This JSON reviver has nothing to do with
* our revivers.
* @param {TypesonOptions} [opts]
* @returns {any|Promise<any>}
*/
parse (text, reviver, opts) {
opts = {...this.options, ...opts, parse: true};
return this.revive(
JSON.parse(text, /** @type {JSONReviver|undefined} */ (reviver)),
opts
);
}
/**
* Also sync but throws on non-sync result.
* @param {string} text
* @param {JSONReviver} [reviver] This JSON reviver has nothing to do with
* our revivers.
* @param {TypesonOptions} [opts]
* @returns {any}
*/
parseSync (text, reviver, opts) {
return this.parse(
text,
reviver,
{throwOnBadSyncType: true, ...opts, sync: true}
);
}
/**
* @param {string} text
* @param {JSONReviver} [reviver] This JSON reviver has nothing to do with
* our revivers.
* @param {TypesonOptions} [opts]
* @returns {Promise<any>}
*/
parseAsync (text, reviver, opts) {
return this.parse(
text,
reviver,
{throwOnBadSyncType: true, ...opts, sync: false}
);
}
/**
*
* @param {any} obj
* @param {StateObject|null|undefined} [stateObj]
* @param {TypesonOptions} [opts]
* @returns {string[]|false}
*/
specialTypeNames (obj, stateObj, opts = {}) {
opts.returnTypeNames = true;
return /** @type {string[]|false} */ (
this.encapsulate(obj, stateObj, opts)
);
}
/**
*
* @param {any} obj
* @param {StateObject|null|undefined} [stateObj]
* @param {TypesonOptions} [opts]
* @returns {Promise<ObjectTypeString|string>|ObjectTypeString|string}
*/
rootTypeName (obj, stateObj, opts = {}) {
opts.iterateNone = true;
return (
/**
* @type {Promise<ObjectTypeString|string>|
* ObjectTypeString|string}
*/
(this.encapsulate(obj, stateObj, opts))
);
}
/**
* Encapsulate a complex object into a plain Object by replacing
* registered types with plain objects representing the types data.
*
* This method is used internally by `Typeson.stringify()`.
* @param {any} obj - Object to encapsulate.
* @param {StateObject|null|undefined} [stateObj]
* @param {TypesonOptions} [options]
* @returns {Promise<any>|
* {[key: (string|Integer)]: any}|any|
* ObjectTypeString|string|string[]|
* false
* } The ObjectTypeString, string and string[] should only be returned
* for `specialTypeNames` and `rootTypeName` calls, not direct use of
* this function.
*/
encapsulate (obj, stateObj, options) {
const opts = {sync: true, ...this.options, ...options};
const {sync} = opts;
/**
* @type {{
* [key: string]: '#'|string|string[]
* }}
*/
const types = {},
/** @type {object[]} */
refObjs = [], // For checking cyclic references
/** @type {string[]} */
refKeys = [], // For checking cyclic references
/** @type {PromisesData} */
promisesDataRoot = [];
// Clone the object deeply while at the same time replacing any
// special types or cyclic reference:
const cyclic = 'cyclic' in opts ? opts.cyclic : true;
const {encapsulateObserver} = opts;
/**
*
* @param {any} _ret
* @returns {{[key: (string|Integer)]: any}|string|string[]|
* ObjectTypeString|any|false}
*/
const finish = (_ret) => {
// Add `$types` to result only if we ever bumped into a
// special type (or special case where object has own `$types`)
const typeNames = Object.values(types);
if (opts.iterateNone) {
if (typeNames.length) {
return typeNames[0];
}
return getJSONType(_ret);
}
if (typeNames.length) {
if (opts.returnTypeNames) {
return [...new Set(typeNames)];
}
// Special if array (or a primitive) was serialized
// because JSON would ignore custom `$types` prop on it
if (!_ret || !isPlainObject(_ret) ||
// Also need to handle if this is an object with its
// own `$types` property (to avoid ambiguity)
hasOwn(_ret, '$types')
) {
_ret = {$: _ret, $types: {$: types}};
} else {
_ret.$types = types;
}
// No special types
} else if (isObject(_ret) && hasOwn(_ret, '$types')) {
_ret = {$: _ret, $types: true};
}
if (opts.returnTypeNames) {
return false;
}
return _ret;
};
/**
*
* @param {any} _ret
* @param {PromisesData} promisesData
* @returns {Promise<any>}
*/
const checkPromises = async (_ret, promisesData) => {
const promResults = await Promise.all(
promisesData.map((pd) => {
return /** @type {TypesonPromise<any>} */ (pd[1]).p;
})
);
await Promise.all(
promResults.map(async function (promResult) {
/** @type {PromisesData} */
const newPromisesData = [];
const [prData] = promisesData.splice(0, 1);
const [
keyPath, , _cyclic, _stateObj,
parentObj, key, detectedType
] = prData;
const encaps = _encapsulate(
keyPath, promResult, _cyclic, _stateObj,
newPromisesData, true, detectedType
);
const isTypesonPromise = hasConstructorOf(
encaps,
TypesonPromise
);
// Handle case where an embedded custom type itself
// returns a `TypesonPromise`
if (keyPath && isTypesonPromise) {
const encaps2 = await encaps.p;
// Undefined parent only for root which has no `keyPath`
// eslint-disable-next-line @stylistic/max-len -- Long
/** @type {{[key: (string|number)]: any}} */ (parentObj)[
/** @type {string|number} */ (key)
] = encaps2;
return checkPromises(_ret, newPromisesData);
}
if (keyPath) {
// Undefined parent only for root which has no `keyPath`
// eslint-disable-next-line @stylistic/max-len -- Long
/** @type {{[key: (string|number)]: any}} */ (parentObj)[
/** @type {string|number} */ (key)
] = encaps;
} else if (isTypesonPromise) {
_ret = encaps.p;
} else {
// If this is itself a `TypesonPromise` (because the
// original value supplied was a `Promise` or
// because the supplied custom type value resolved
// to one), returning it below will be fine since
// a `Promise` is expected anyways given current
// config (and if not a `Promise`, it will be ready
// as the resolve value)
_ret = encaps;
}
return checkPromises(_ret, newPromisesData);
})
);
return _ret;
};
/**
* @typedef {object} OwnKeysObject
* @property {boolean} ownKeys
*/
/**
* @callback BuiltinStateObjectPropertiesCallback
* @returns {void}
*/
/**
*
* @param {StateObject} _stateObj
* @param {OwnKeysObject} ownKeysObj
* @param {BuiltinStateObjectPropertiesCallback} cb
* @returns {void}
*/
const _adaptBuiltinStateObjectProperties = (
_stateObj, ownKeysObj, cb
) => {
Object.assign(_stateObj, ownKeysObj);
const vals = internalStateObjPropsToIgnore.map((prop) => {
const tmp = _stateObj[prop];
delete _stateObj[prop];
return tmp;
});
// eslint-disable-next-line n/callback-return
cb();
internalStateObjPropsToIgnore.forEach((prop, i) => {
// We're just copying from one StateObject to another,
// so force TS with a type each can take
_stateObj[prop] = /** @type {any} */ (vals[i]);
});
};
/**
*
* @param {string} keypath
* @param {any} value
* @param {boolean|undefined|"readonly"} _cyclic
* @param {StateObject} _stateObj
* @param {PromisesData} promisesData
* @param {?boolean} [resolvingTypesonPromise]
* @param {string} [detectedType]
* @returns {any}
*/
const _encapsulate = (
keypath, value, _cyclic, _stateObj, promisesData,
resolvingTypesonPromise, detectedType
) => {
let _ret;
/**
* @type {{}|{
* replaced: any
* }|{
* clone: {[key: string]: any}
* }}
*/
let observerData = {};
const $typeof = typeof value;
const runObserver = encapsulateObserver
// eslint-disable-next-line @stylistic/max-len -- Long
// eslint-disable-next-line @stylistic/operator-linebreak -- Needs JSDoc
?
// Bug with TS apparently as can't just use
// `@type {Observer}` here as doesn't see param is optional
/**
* @param {KeyPathEvent|EndIterateInEvent|EndIterateOwnEvent|
* EndIterateUnsetNumericEvent|
* TypeDetectedEvent|ReplacingEvent} [_obj]
* @returns {void}
*/
function (_obj) {
const type = detectedType ?? _stateObj.type ?? (
getJSONType(value)
);
encapsulateObserver(Object.assign(_obj ?? observerData, {
keypath,
value,
cyclic: _cyclic,
stateObj: _stateObj,
promisesData,
resolvingTypesonPromise,
awaitingTypesonPromise: hasConstructorOf(
value,
TypesonPromise
)
}, {type}));
}
: null;
if (['string', 'boolean', 'number', 'undefined'].includes(
$typeof
)) {
if (value === undefined ||
(
// Numbers that are not supported in JSON
Number.isNaN(value) ||
value === Number.NEGATIVE_INFINITY ||
value === Number.POSITIVE_INFINITY ||
// This can be 0 or -0
value === 0
)
) {
_ret = _stateObj.replaced
? value
: replace(
keypath, value, _stateObj, promisesData,
false, resolvingTypesonPromise, runObserver
);
if (_ret !== value) {
observerData = {replaced: _ret};
}
} else {
_ret = value;
}
if (runObserver) {
runObserver();
}
return _ret;
}
if (value === null) {
if (runObserver) {
runObserver();
}
return value;
}
if (_cyclic && !_stateObj.iterateIn &&
!_stateObj.iterateUnsetNumeric && value &&
typeof value === 'object'
) {
// Options set to detect cyclic references and be able
// to rewrite them.
const refIndex = refObjs.indexOf(value);
if (refIndex < 0) {
if (_cyclic === true) {
refObjs.push(value);
refKeys.push(keypath);
}
} else {
types[keypath] = '#';
if (runObserver) {
runObserver({
cyclicKeypath: refKeys[refIndex]
});
}
return '#' + refKeys[refIndex];
}
}
const isPlainObj = isPlainObject(value);
const isArr = isArray(value);
const replaced = (
// Running replace will cause infinite loop as will test
// positive again
((isPlainObj || isArr) &&
(!this.plainObjectReplacers.length ||
_stateObj.replaced)
) ||
_stateObj.iterateIn
)
// Optimization: if plain object and no plain-object
// replacers, don't try finding a replacer
? value
: replace(
keypath, value, _stateObj, promisesData,
isPlainObj || isArr,
null,
runObserver
);
/** @type {undefined|Array<any>|{[key: string]: any}} */
let clone;
if (replaced !== value) {
_ret = replaced;
observerData = {replaced};
} else {
// eslint-disable-next-line no-lonely-if
if (keypath === '' &&
hasConstructorOf(value, TypesonPromise)
) {
promisesData.push([
keypath, value, _cyclic, _stateObj,
undefined, undefined, _stateObj.type
]);
_ret = value;
} else if ((isArr && _stateObj.iterateIn !== 'object') ||
_stateObj.iterateIn === 'array'
) {
// eslint-disable-next-line unicorn/no-new-array -- Sparse
clone = new Array(value.length);
observerData = {clone};
} else if (
(
!['function', 'symbol'].includes(typeof value) &&
!('toJSON' in value) &&
!hasConstructorOf(value, TypesonPromise) &&
!hasConstructorOf(value, Promise) &&
!hasConstructorOf(value, ArrayBuffer)
) ||
isPlainObj ||
_stateObj.iterateIn === 'object'
) {
clone = {};
if (_stateObj.addLength) {
clone.length = value.length;
}
observerData = {clone};
} else {
_ret = value; // Only clone vanilla objects and arrays
}
}
if (runObserver) {
runObserver();
}
if (opts.iterateNone) {
return clone ?? _ret;
}
if (!clone) {
return _ret;
}
// Iterate object or array
if (_stateObj.iterateIn) {
// eslint-disable-next-line guard-for-in
for (const key in value) {
const ownKeysObj = {ownKeys: hasOwn(value, key)};
_adaptBuiltinStateObjectProperties(
_stateObj,
ownKeysObj,
() => {
const kp = keypath + (keypath ? '.' : '') +
escapeKeyPathComponent(key);
const val = _encapsulate(
kp, value[key], Boolean(_cyclic), _stateObj,
promisesData, resolvingTypesonPromise
);
if (hasConstructorOf(val, TypesonPromise)) {
promisesData.push([
kp, val, Boolean(_cyclic), _stateObj,
clone, key, _stateObj.type
]);
} else if (val !== undefined) {
/** @type {{[key: (string|Integer)]: any}} */ (
clone
)[key] = val;
}
}
);
}
if (runObserver) {
runObserver({endIterateIn: true, end: true});
}
} else {
// Note: Non-indexes on arrays won't survive stringify so
// somewhat wasteful for arrays, but so too is iterating
// all numeric indexes on sparse arrays when not wanted
// or filtering own keys for positive integers
keys(value).forEach(function (key) {
const kp = keypath + (keypath ? '.' : '') +
escapeKeyPathComponent(key);
const ownKeysObj = {ownKeys: true};
_adaptBuiltinStateObjectProperties(
_stateObj,
ownKeysObj,
() => {
const val = _encapsulate(
kp, value[key], Boolean(_cyclic), _stateObj,
promisesData, resolvingTypesonPromise
);
if (hasConstructorOf(val, TypesonPromise)) {
promisesData.push([
kp, val, Boolean(_cyclic), _stateObj,
clone, key, _stateObj.type
]);
} else if (val !== undefined) {
/** @type {{[key: string]: any}} */ (
clone
)[key] = val;
}
}
);
});
if (runObserver) {
runObserver({endIterateOwn: true, end: true});
}
}
// Iterate array for non-own numeric properties (we can't
// replace the prior loop though as it iterates non-integer
// keys)
if (_stateObj.iterateUnsetNumeric) {
const vl = value.length;
for (let i = 0; i < vl; i++) {
if (!(i in value)) {
// No need to escape numeric
const kp = `${keypath}${keypath ? '.' : ''}${i}`;
const ownKeysObj = {ownKeys: false};
_adaptBuiltinStateObjectProperties(
_stateObj,
ownKeysObj,
() => {
const val = _encapsulate(
kp, undefined, Boolean(_cyclic), _stateObj,
promisesData, resolvingTypesonPromise
);
if (hasConstructorOf(val, TypesonPromise)) {
promisesData.push([
kp, val, Boolean(_cyclic), _stateObj,
clone, i, _stateObj.type
]);
} else if (val !== undefined) {
/** @type {{[key: Integer]: any}} */
(clone)[i] = val;
}
}
);
}
}
if (runObserver) {
runObserver({endIterateUnsetNumeric: true, end: true});
}
}
return clone;
};
/**
*
* @param {string} keypath
* @param {any} value
* @param {StateObject} _stateObj
* @param {PromisesData} promisesData
* @param {boolean} plainObject
* @param {?boolean} [resolvingTypesonPromise]
* @param {Observer|null} [runObserver]
* @throws {Error}
* @returns {any}
*/
const replace = (
keypath, value, _stateObj, promisesData, plainObject,
resolvingTypesonPromise, runObserver
) => {
// Encapsulate registered types
const replacers = plainObject
? this.plainObjectReplacers
: this.nonplainObjectReplacers;
let i = replacers.length;
while (i--) {
const replacer = replacers[i];
if (replacer.test(value, _stateObj)) {
const {type} = replacer;
if (this.revivers[type]) {
// Record the type only if a corresponding reviver
// exists. This is to support specs where only
// replacement is done.
// For example, ensuring deep cloning of the object,
// or replacing a type to its equivalent without
// the need to revive it.
const existing = types[keypath];
// type can comprise an array of types (see test
// "should support intermediate types")
types[keypath] = existing
? [type].concat(existing)
: type;
}
Object.assign(_stateObj, {type, replaced: true});
if ((sync || !replacer.replaceAsync) &&
!replacer.replace
) {
if (runObserver) {
runObserver({typeDetected: true});
}
return _encapsulate(
keypath, value, cyclic && 'readonly',
_stateObj, promisesData,
resolvingTypesonPromise, type
);
}
if (runObserver) {
runObserver({replacing: true});
}
// Now, also traverse the result in case it contains its
// own types to replace
let replaced;
if (sync || !replacer.replaceAsync) {
// Shouldn't reach here due to above condition
/* c8 ignore next 3 */
if (typeof replacer.replace === 'undefined') {
throw new TypeError('Missing replacer');
}
replaced = replacer.replace(value, _stateObj);
} else {
replaced = replacer.replaceAsync(value, _stateObj);
}
return _encapsulate(
keypath,
replaced,
cyclic && 'readonly', _stateObj, promisesData,