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test.js
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/* eslint-disable no-console, no-restricted-syntax,
jsdoc/require-jsdoc, no-empty-function, no-shadow,
jsdoc/no-bad-blocks,
@typescript-eslint/no-misused-promises,
@typescript-eslint/no-floating-promises -- Testing
*/
import {describe, it} from 'mocha';
import {assert} from 'chai';
import * as B64 from 'base64-arraybuffer-es6';
import {
Typeson, TypesonPromise, Undefined,
toStringTag, isThenable, isUserObject, hasConstructorOf,
getByKeyPath, setAtKeyPath
} from '../typeson.js';
const debug = false;
/**
* @param {...any} args
* @returns {void}
*/
function log (...args) {
// eslint-disable-next-line @stylistic/max-len -- Long
// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition -- Toggle
if (debug) {
console.log(...args);
}
}
const typeson = new Typeson().register({
zero: [
(x) => x === 0,
(n) => ({
negative: Object.is(n, -0)
}),
(s) => (s.negative ? -0 : 0)
],
Date: [
function (x) { return x instanceof Date; },
function (date) { return date.getTime(); },
function (time) { return new Date(time); }
],
Error: [
function (x) { return x instanceof Error; },
function (error) { return {name: error.name, message: error.message}; },
function (data) {
const e = new Error(data.message);
e.name = data.name;
return e;
}
],
SpecialNumber: [
function (x) {
return Number.isNaN(x) || x === Number.POSITIVE_INFINITY ||
x === Number.NEGATIVE_INFINITY;
},
function (n) {
return Number.isNaN(n) ? 'NaN' : n > 0 ? 'Infinity' : '-Infinity';
},
function (/** @type {string} */ s) {
return {
NaN: Number.NaN,
Infinity: Number.POSITIVE_INFINITY,
'-Infinity': Number.NEGATIVE_INFINITY
}[s];
}
],
ArrayBuffer: [
function test (x) { return toStringTag(x) === 'ArrayBuffer'; },
function encapsulate (b) { return B64.encode(b); },
function revive (b64) { return B64.decode(b64); }
],
DataView: [
function (x) { return x instanceof DataView; },
function (dw) {
return {
buffer: dw.buffer,
byteOffset: dw.byteOffset,
byteLength: dw.byteLength
};
},
function (obj) {
return new DataView(obj.buffer, obj.byteOffset, obj.byteLength);
}
]
});
const globalTypeson = typeson;
/**
* @param {any} x
* @returns {any}
*/
function roundtrip (x) {
const tson = typeson.stringifySync(x, null, 2);
log(tson);
return typeson.parseSync(tson);
}
describe('Typeson', function () {
it('should support basic types', () => {
let res = roundtrip({});
assert(Object.keys(res).length === 0, 'Result should be empty');
const date = new Date();
const input = {
a: 'a', b: 2, c () {}, d: false, e: null,
f: Symbol('symbol'), g: [], h: date, i: /apa/gui,
j: 0, k: -0
};
res = roundtrip(input);
assert(res !== input, 'Object is a clone, not a reference');
assert(res.a === 'a', 'String value');
assert(res.b === 2, 'Number value');
assert(!res.c, 'Functions should not follow by default');
assert(res.d === false, 'Boolean value');
assert(res.e === null, 'Null value');
assert(!res.f, 'Symbols should not follow by default');
assert(Array.isArray(res.g) && res.g.length === 0, 'Array value');
assert(
res.h instanceof Date && res.h.toString() === date.toString(),
'Date value'
);
assert(
Object.keys(res.i).length === 0,
'regex only treated as empty object by default'
);
assert(Object.is(res.j, 0), 'Positive zero');
assert(Object.is(res.k, -0), 'Negative zero');
});
it('should resolve nested objects', () => {
const input = {a: [{subA: 5}, [6, 7]], b: {subB: {c: 8}}};
const res = roundtrip(input);
assert(res.a[0].subA === 5, 'Object within array');
assert(res.a[1][0] === 6, 'Array within array');
assert(res.a[1][1] === 7, 'Array within array');
assert(res.b.subB.c === 8, 'Object within object');
});
it('should support object API', () => {
const typeson = new Typeson().register({
Date: {
test (x) { return x instanceof Date; },
replace (date) { return date.getTime(); },
revive (time) { return new Date(time); }
}
});
const date = new Date();
const tson = typeson.stringify(date, null, 2);
log(tson);
const back = typeson.parse(/** @type {string} */ (tson));
assert(
back instanceof Date && back.toString() === date.toString(),
'Date value'
);
});
it('should support objects containing internally used properties', () => {
/**
* @param {any} data
* @param {(result: any) => void} cb
* @returns {void}
*/
function check (data, cb) {
const tson = typeson.stringify(data, null, 2);
log(tson);
const result = typeson.parse(/** @type {string} */ (tson));
cb(result);
}
/**
* @param {boolean} val
* @returns {void}
*/
function valSwitch (val) {
check({$types: val}, function (result) {
assert(
result.$types === val &&
Object.keys(result).length === 1,
'Preserves $types on original object without additions'
);
});
check({$: val}, function (result) {
assert(
result.$ === val && Object.keys(result).length === 1,
'Preserves $ on original object without additions'
);
});
check({$: val, $types: val}, function (result) {
assert(
result.$ === val &&
result.$types === val &&
Object.keys(result).length === 2,
'Preserves $ and $types values on original ' +
'object without additions'
);
});
}
valSwitch(true);
valSwitch(false);
check(
{$: {}, $types: {$: {'': 'val', cyc: '#'}, '#': 'a1', '': 'b1'}},
function (result) {
assert(
typeof result.$ === 'object' &&
!Object.keys(result.$).length &&
result.$types.$[''] === 'val' &&
result.$types.$.cyc === '#' &&
result.$types['#'] === 'a1' &&
result.$types[''] === 'b1' &&
Object.keys(result.$types).length === 3,
'Preserves $ and $types subobjects on original ' +
'object without additions'
);
}
);
check({a: new Date(), $types: {}}, function (result) {
assert(
result.a instanceof Date &&
!('$' in result) &&
typeof result.$types === 'object' &&
!Object.keys(result.$types).length,
'Roundtrips type while preserving $types subobject ' +
'from original object without additions'
);
});
check({a: new Date(), $: {}}, function (result) {
assert(
result.a instanceof Date &&
!('$types' in result) &&
typeof result.$ === 'object' &&
!Object.keys(result.$).length,
'Roundtrips type while preserving $ subobject from ' +
'original object without additions'
);
});
check({a: new Date(), $types: {}, $: {}}, function (result) {
assert(
result.a instanceof Date &&
typeof result.$types === 'object' &&
!Object.keys(result.$types).length &&
typeof result.$ === 'object' &&
!Object.keys(result.$).length,
'Roundtrips type while preserving $ and $types subobjects ' +
'from original object without additions'
);
});
/**
* @param {boolean} val
* @returns {void}
*/
function valSwitch2 (val) {
check({a: new Date(), $types: val}, function (result) {
assert(
result.a instanceof Date &&
!('$' in result) &&
result.$types === val,
'Roundtrips type while preserving $types value ' +
'from original object'
);
});
check({a: new Date(), $: val}, function (result) {
assert(
result.a instanceof Date &&
!('$types' in result) &&
result.$ === val,
'Roundtrips type while preserving $ value ' +
'from original object'
);
});
check({a: new Date(), $types: val, $: val}, function (result) {
assert(
result.a instanceof Date &&
result.$types === val &&
result.$ === val,
'Roundtrips type while preserving $types and $ values ' +
'from original object'
);
});
}
valSwitch2(true);
valSwitch2(false);
check({a: new Date(), $: {}}, function (result) {
assert(
result.a instanceof Date &&
!('$types' in result) &&
typeof result.$ === 'object' &&
!Object.keys(result.$).length,
'Roundtrips type while preserving $ subojbect from original ' +
'object without additions'
);
});
});
it('should handle path separators in objects', () => {
const input = {
aaa: {
bbb: new Date(91000000000)
},
'aaa.bbb': 2,
lll: {
mmm: 3
},
'lll.mmm': new Date(92000000000),
'qqq.rrr': 4,
qqq: {
rrr: new Date(93000000000)
},
yyy: {
zzz: 5
},
'yyy.zzz': new Date(94000000000),
allNormal1: {
a: 100
},
'allNormal1.a': 200,
allTyped1: {
a: new Date(95000000000)
},
'allTyped1.a': new Date(96000000000),
'allNormal2.b': 400,
allNormal2: {
b: 500
},
allTyped2: {
b: new Date(97000000000)
},
'allTyped2.b': new Date(98000000000),
'A~': 'abc',
'A~1': 'ghi',
'A~0': 'def',
'A.': 'jkl',
'B~': new Date(99100000000),
'B~0': new Date(99200000000),
'B~1': new Date(99300000000),
'B.': new Date(99400000000)
};
const res = roundtrip(input);
assert(
res.aaa.bbb instanceof Date && res['aaa.bbb'] === 2 &&
res.aaa.bbb.getTime() === 91000000000,
'Properties with periods (with type) after normal ' +
'properties (without type)'
);
assert(
res['lll.mmm'] instanceof Date && res.lll.mmm === 3 &&
res['lll.mmm'].getTime() === 92000000000,
'Properties with periods (without type) after normal ' +
'properties (with type)'
);
assert(
res.qqq.rrr instanceof Date && res['qqq.rrr'] === 4 &&
res.qqq.rrr.getTime() === 93000000000,
'Properties with periods (without type) before normal ' +
'properties (with type)'
);
assert(
res['yyy.zzz'] instanceof Date && res.yyy.zzz === 5 &&
res['yyy.zzz'].getTime() === 94000000000,
'Properties with periods (with type) before normal ' +
'properties (without type)'
);
assert(
res.allNormal1.a === 100 && res['allNormal1.a'] === 200,
'Properties with periods (without type) after normal ' +
'properties (without type)'
);
assert(
res.allTyped1.a instanceof Date &&
res['allTyped1.a'] instanceof Date &&
res.allTyped1.a.getTime() === 95000000000 &&
res['allTyped1.a'].getTime() === 96000000000,
'Properties with periods (with type) after normal ' +
'properties (with type)'
);
assert(
res.allNormal2.b === 500 && res['allNormal2.b'] === 400,
'Properties with periods (without type) before normal ' +
'properties (without type)'
);
assert(
res.allTyped2.b instanceof Date &&
res['allTyped2.b'] instanceof Date &&
res.allTyped2.b.getTime() === 97000000000 &&
res['allTyped2.b'].getTime() === 98000000000,
'Properties with periods (with type) after normal ' +
'properties (with type)'
);
assert(
res['A~'] === 'abc' &&
res['A~0'] === 'def' &&
res['A~1'] === 'ghi' &&
res['A.'] === 'jkl' &&
res['B~'] instanceof Date &&
res['B~'].getTime() === 99100000000 &&
res['B~0'] instanceof Date &&
res['B~0'].getTime() === 99200000000 &&
res['B~1'] instanceof Date &&
res['B~1'].getTime() === 99300000000 &&
res['B.'] instanceof Date &&
res['B.'].getTime() === 99400000000,
'Find properties with escaped and unescaped characters'
);
});
it('should support arrays', () => {
const res = roundtrip([1, new Date(), 3]);
assert(Array.isArray(res), 'Result should be an array');
assert(res.length === 3, 'Should have length 3');
assert(res[2] === 3, 'Third item should be 3');
});
it('should support intermediate types', () => {
/**
* @param {Date} date
* @returns {void}
*/
function CustomDate (date) {
this._date = date;
}
const typeson = new Typeson()
.register(globalTypeson.types)
.register({
CustomDate: [
(x) => x instanceof CustomDate,
(cd) => cd._date,
(date) => new CustomDate(date)
]
});
const date = new Date();
const input = new CustomDate(new Date());
const tson = typeson.stringify(input);
log(tson);
const back = typeson.parse(/** @type {string} */ (tson));
assert(back instanceof CustomDate, 'Should get CustomDate back');
assert(
back._date.getTime() === date.getTime(),
'Should have correct value'
);
});
it('should support intermediate types (async)', async () => {
/**
* @param {Date} date
* @returns {void}
*/
function CustomDate (date) {
this._date = date;
}
const typeson = new Typeson()
.register({
date: {
test (x) { return x instanceof Date; },
replaceAsync (date) {
return new TypesonPromise((resolve) => {
setTimeout(() => {
resolve(date.getTime());
});
});
},
reviveAsync (time) {
return new TypesonPromise((resolve) => {
setTimeout(() => {
resolve(new Date(time));
});
});
}
}
})
.register({
CustomDate: {
test (x) {
return x instanceof CustomDate;
},
replaceAsync (cd) {
return new TypesonPromise((resolve) => {
resolve(cd._date);
});
},
reviveAsync (date) {
return new TypesonPromise((resolve) => {
resolve(new CustomDate(date));
});
}
}
});
const date = new Date();
const input = new CustomDate(new Date());
const tson = await typeson.stringifyAsync(input);
log(tson);
const back = await typeson.parseAsync(tson);
assert(back instanceof CustomDate, 'Should get CustomDate back');
assert(
back._date.getTime() === date.getTime(),
'Should have correct value'
);
});
it('should run replacers recursively', () => {
/**
* @param {Date} date
* @param {string} name
* @returns {void}
*/
function CustomDate (date, name) {
this._date = date;
this.name = name;
this.year = date.getFullYear();
}
CustomDate.prototype.getRealDate = function () {
return this._date;
};
CustomDate.prototype.getName = function () {
return this.name;
};
const date = new Date();
const input = {
name: 'Karl',
date: new CustomDate(date, 'Otto')
};
const typeson = new Typeson()
.register(globalTypeson.types)
.register({
CustomDate: [
(x) => x instanceof CustomDate,
(cd) => ({_date: cd.getRealDate(), name: cd.name}),
(obj) => new CustomDate(obj._date, obj.name)
]
});
const tson = typeson.stringify(input, null, 2);
log(tson);
const result = typeson.parse(/** @type {string} */ (tson));
assert(result.name === 'Karl', 'Basic prop');
assert(
result.date instanceof CustomDate,
'Correct instance type of custom date'
);
assert(
result.date.getName() === 'Otto',
'prototype method works and properties seems to be in place'
);
assert(
result.date.getRealDate().getTime() === date.getTime(),
'The correct time is there'
);
});
it('should be able to stringify complex objects at root', () => {
const x = roundtrip(new Date(3));
assert(x instanceof Date, 'x should be a Date');
assert(x.getTime() === 3, 'Time should be 3');
const y = roundtrip([new Date(3)]);
assert(y[0] instanceof Date, 'y[0] should be a Date');
assert(y[0].getTime() === 3, 'Time should be 3');
function Custom () {
this.x = 'oops';
}
let TSON = new Typeson().register({
Custom: [
(x) => x instanceof Custom,
() => false,
() => new Custom()
]
});
let tson = TSON.stringify(new Custom());
log(tson);
let z = TSON.parse(/** @type {string} */ (tson));
assert(
z instanceof Custom && z.x === 'oops',
'Custom type encapsulated in bool should work'
);
TSON = new Typeson().register({
Custom: [
(x) => x instanceof Custom,
() => 42,
() => new Custom()
]
});
tson = TSON.stringify(new Custom());
log(tson);
z = TSON.parse(/** @type {string} */ (tson));
assert(
z instanceof Custom && z.x === 'oops',
'Custom type encapsulated in bool should work'
);
TSON = new Typeson().register({
Custom: [
(x) => x instanceof Custom,
() => 'foo',
() => new Custom()
]
});
tson = TSON.stringify(new Custom());
log(tson);
z = TSON.parse(/** @type {string} */ (tson));
assert(
z instanceof Custom && z.x === 'oops',
'Custom type encapsulated in bool should work'
);
});
it(
'should be possible to encapsulate object with reserved `$types` ' +
'property',
() => {
class Custom {
/**
* @param {string} val
* @param {string} $types
*/
constructor (val, $types) {
this.val = val;
this.$types = $types;
}
}
const typeson = new Typeson().register({
Custom: [
(x) => x instanceof Custom,
(c) => ({val: c.val, $types: c.$types}),
(o) => new Custom(o.val, o.$types)
]
});
const input = new Custom('bar', 'foo');
const tson = typeson.stringify(input);
log(tson);
const x = typeson.parse(/** @type {string} */ (tson));
assert(x instanceof Custom, 'Should get a Custom back');
assert(x.val === 'bar', 'Should have correct val value');
assert(x.$types === 'foo', 'Should have correct $types value');
}
);
/*
// Todo?
it('should leave left out type', () => {
// Uint8Buffer is not registered.
});
*/
it('executing toJSON', () => {
function A () {}
A.prototype.toJSON = function () { return 'abcd'; };
let typeson = new Typeson();
let a = new A(); // Encapsulated as is
let tson = typeson.stringify(a);
log(tson);
let back = typeson.parse(/** @type {string} */ (tson));
assert(back === 'abcd', 'Should have executed `toJSON`');
typeson = new Typeson();
// Plain object rebuilt during encapsulation including with `toJSON`
a = {
toJSON () { return 'abcd'; }
};
tson = typeson.stringify(a);
log(tson);
back = typeson.parse(/** @type {string} */ (tson));
assert(back === 'abcd', 'Should have executed `toJSON`');
});
it('should allow plain object replacements', () => {
const typeson = new Typeson().register({
plainObj: {
testPlainObjects: true,
test (x) {
return 'nonenum' in x;
},
replace (o) {
return {
b: o.b,
nonenum: o.nonenum
};
}
}
});
const a = {b: 5};
Object.defineProperty(a, 'nonenum', {
enumerable: false,
value: 100
});
let tson = typeson.stringify(a);
log(tson);
let back = typeson.parse(/** @type {string} */ (tson));
assert(back.b === 5, 'Should have kept property');
assert(
back.nonenum === 100,
'Should have kept non-enumerable property'
);
assert(
{}.propertyIsEnumerable.call(back, 'nonenum'),
'Non-enumerable property should now be enumerable'
);
const x = Object.create(null);
x.b = 7;
Object.defineProperty(x, 'nonenum', {
enumerable: false,
value: 50
});
tson = typeson.stringify(x);
log(tson);
back = typeson.parse(/** @type {string} */ (tson));
assert(back.b === 7, 'Should have kept property');
assert(back.nonenum === 50, 'Should have kept non-enumerable property');
assert(
{}.propertyIsEnumerable.call(back, 'nonenum'),
'Non-enumerable property should now be enumerable'
);
});
it('should allow forcing of async return', () => {
const typeson = new Typeson({sync: false, throwOnBadSyncType: false});
const x = 5;
return /** @type {Promise<string>} */ (
typeson.stringify(x)
).then(function (tson) {
log(tson);
const back = typeson.parse(/** @type {string} */ (tson));
return back;
}).then(function (back) {
assert(
back === 5,
'Should allow async to be forced even without ' +
'async return values'
);
return undefined;
});
});
it('should throw on non-async forced async return', () => {
const typeson = new Typeson({sync: false, throwOnBadSyncType: true});
const x = 5;
const tson = typeson.stringifySync(x);
try {
typeson.parse(/** @type {string} */ (tson));
assert(false);
} catch (err) {
assert(
/** @type {TypeError} */ (err).message ===
'Async method requested but sync result obtained'
);
}
});
it('should transmit state through replacers and revivers', () => {
class ReplaceReviver {
/**
* @param {object} obj
*/
constructor (obj) {
Object.defineProperty(this, 'obj', {
enumerable: false,
value: obj
});
}
[Symbol.toStringTag] = 'ReplaceReviver';
}
const typeson = new Typeson().register({
replaceReviveContainer: {
test (x) {
return toStringTag(x) === 'ReplaceReviver';
},
replace (
b,
/**
* @type {import('../typeson.js').StateObject & {
* objs?: any[]
* }}
*/
stateObj
) {
if (!stateObj.objs) {
stateObj.objs = [];
}
const index = stateObj.objs.indexOf(b.obj);
if (index > -1) {
return {index};
}
stateObj.objs.push(b.obj);
return {
obj: b.obj
};
},
revive (
o,
/**
* @type {import('../typeson.js').StateObject & {
* objs?: any[]
* }}
*/
stateObj
) {
if (!stateObj.objs) {
stateObj.objs = [];
}
if ('index' in o) {
return stateObj.objs[o.index];
}
const rr = new ReplaceReviver(o.obj);
stateObj.objs.push(rr);
return rr;
}
}
});
const rrObj1 = {value: 10};
const rrObj2 = {value: 353};
const rrObjXYZ = {value: 10};
const rr1 = new ReplaceReviver(rrObj1);
const rr2 = new ReplaceReviver(rrObj2);
const rr3 = new ReplaceReviver(rrObj1);
const rrXYZ = new ReplaceReviver(rrObjXYZ);
const obj = {rr1, rr2, rr3, rrXYZ};
const tson = typeson.stringify(obj);
log(tson);
const back = typeson.parse(/** @type {string} */ (tson));
assert(back.rr1.obj.value === 10, 'Should preserve value (rr1)');
assert(back.rr2.obj.value === 353, 'Should preserve value (rr2)');
assert(back.rr3.obj.value === 10, 'Should preserve value (rr3)');
assert(back.rrXYZ.obj.value === 10, 'Should preserve value (rrXYZ)');
assert(back.rr1.obj === back.rr3.obj, 'Should preserve objects');
assert(
back.rr1.obj !== back.rrXYZ.obj,
'Should not confuse objects where only value is the same'
);
});
it('should allow serializing arrays to objects', () => {
let endIterateIn;
const typeson = new Typeson({
encapsulateObserver (o) {
if (o.endIterateIn) {
endIterateIn = true;
}
}
}).register({
arraysToObjects: {
testPlainObjects: true,
test (x, stateObj) {
if (Array.isArray(x)) {
stateObj.iterateIn = 'object';
stateObj.addLength = true;
return true;
}
return false;
},
revive (o) {
/**
* @type {{[key: string]: any}}
*/
const arr = [];
// No map here as may be a sparse array (including
// with `length` set)
Object.entries(o).forEach(([key, val]) => {
arr[key] = val;
});
return arr;
}
}
});
/**
* @type {{[key: string]: any}}
*/
const arr = Array.from({length: 10});
arr[0] = 3;
arr[2] = {arr};
arr[2].f = [[arr]];
arr[3] = '4';
arr[4] = 5;
arr[6] = arr;
arr[7] = [arr];
arr[9] = {arr};
arr.b = 'ddd';
arr[-2] = 'eee';
arr[9].f = [[arr]];
const tson = typeson.stringify(arr, null, 2);
log('tson', tson);
assert(endIterateIn, 'Observes `endIterateIn` state');
const back = typeson.parse(/** @type {string} */ (tson));
log('back', back);
assert(
back[0] === 3 && back[3] === '4' && back[4] === 5,
'Preserves regular array indexes'
);
assert(
back.b === 'ddd' && back[-2] === 'eee',
'Preserves non-numeric and non-positive-integer indexes'
);
assert(
back[6] === back &&
back[7][0] === back &&
Array.isArray(back),
'Preserves circular array references'
);
assert(
Array.isArray(back[2].arr), 'Preserves cyclic array on object'
);
assert(
Array.isArray(back[9].arr), 'Preserves cyclic array on object'
);
assert(
back[2].f[0][0] === back, 'Preserves nested cyclic array'
);
assert(
back[9].f[0][0] === back, 'Preserves nested cyclic array'
);
});
it('should allow serializing arrays to objects (nested)', () => {
const typeson = new Typeson().register({
arraysToObjects: {
testPlainObjects: true,
test (x, stateObj) {
if (Array.isArray(x)) {
stateObj.iterateIn = 'object';
stateObj.addLength = true;
return true;
}
return false;
},
revive (o) {
/**
* @type {{[key: string]: any}}
*/
const arr = [];
// No map here as may be a sparse array (including
// with `length` set)
Object.entries(o).forEach(([key, val]) => {
arr[key] = val;
});
return arr;
}
}
});
const arr = Array.from({length: 10});
arr[2] = {arr};
arr[2].f = [[arr]];
const tson = typeson.stringify(arr, null, 2);
log(tson);
const tsonStringifiedSomehowWithNestedTypesFirst = `
{
"2": {
"arr": "#",
"f": {
"0": {
"0": "#",
"length": 1
},
"length": 1
}
},
"length": 10,
"$types": {
"2.f.0.0": "#",
"": "arraysToObjects",
"2.arr": "#",
"2.f.0": "arraysToObjects",
"2.f": "arraysToObjects"
}
}
`;
const back = typeson.parse(/** @type {string} */ (
tsonStringifiedSomehowWithNestedTypesFirst
));
log('back', back);
assert(
Array.isArray(back[2].arr), 'Preserves cyclic array on object'
);
assert(
back[2].f[0][0] === back, 'Preserves nested cyclic array'
);
});
it('should allow unknown string tags', () => {
/**
* @type {import('../typeson.js').TypeSpecSet}
*/
const map = {
map: {
test (x) { return toStringTag(x) === 'Map'; },
replace (mp) { return [...mp.entries()]; },
revive (entries) { return new Map(entries); }