@aws-cdk/assert
Version:
An assertion library for use with CDK Apps
404 lines • 45.7 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.annotateMatcher = exports.matcherFrom = exports.encodedJson = exports.Capture = exports.notMatching = exports.anything = exports.stringLike = exports.match = exports.failMatcher = exports.arrayWith = exports.exactValue = exports.deepObjectLike = exports.objectLike = void 0;
const have_resource_1 = require("./have-resource");
/**
* A matcher for an object that contains at least the given fields with the given matchers (or literals)
*
* Only does lenient matching one level deep, at the next level all objects must declare the
* exact expected keys again.
*/
function objectLike(pattern) {
return _objectContaining(pattern, false);
}
exports.objectLike = objectLike;
/**
* A matcher for an object that contains at least the given fields with the given matchers (or literals)
*
* Switches to "deep" lenient matching. Nested objects also only need to contain declared keys.
*/
function deepObjectLike(pattern) {
return _objectContaining(pattern, true);
}
exports.deepObjectLike = deepObjectLike;
function _objectContaining(pattern, deep) {
const anno = { [deep ? '$deepObjectLike' : '$objectLike']: pattern };
return annotateMatcher(anno, (value, inspection) => {
if (typeof value !== 'object' || !value) {
return failMatcher(inspection, `Expect an object but got '${typeof value}'`);
}
const errors = new Array();
for (const [patternKey, patternValue] of Object.entries(pattern)) {
if (patternValue === have_resource_1.ABSENT) {
if (value[patternKey] !== undefined) {
errors.push(`Field ${patternKey} present, but shouldn't be`);
}
continue;
}
if (!(patternKey in value)) {
errors.push(`Field ${patternKey} missing`);
continue;
}
// If we are doing DEEP objectLike, translate object literals in the pattern into
// more `deepObjectLike` matchers, even if they occur in lists.
const matchValue = deep ? deepMatcherFromObjectLiteral(patternValue) : patternValue;
const innerInspection = { ...inspection, failureReason: '' };
const valueMatches = match(value[patternKey], matchValue, innerInspection);
if (!valueMatches) {
errors.push(`Field ${patternKey} mismatch: ${innerInspection.failureReason}`);
}
}
/**
* Transform nested object literals into more deep object matchers, if applicable
*
* Object literals in lists are also transformed.
*/
function deepMatcherFromObjectLiteral(nestedPattern) {
if (isObject(nestedPattern)) {
return deepObjectLike(nestedPattern);
}
if (Array.isArray(nestedPattern)) {
return nestedPattern.map(deepMatcherFromObjectLiteral);
}
return nestedPattern;
}
if (errors.length > 0) {
return failMatcher(inspection, errors.join(', '));
}
return true;
});
}
/**
* Match exactly the given value
*
* This is the default, you only need this to escape from the deep lenient matching
* of `deepObjectLike`.
*/
function exactValue(expected) {
const anno = { $exactValue: expected };
return annotateMatcher(anno, (value, inspection) => {
return matchLiteral(value, expected, inspection);
});
}
exports.exactValue = exactValue;
/**
* A matcher for a list that contains all of the given elements in any order
*/
function arrayWith(...elements) {
if (elements.length === 0) {
return anything();
}
const anno = { $arrayContaining: elements.length === 1 ? elements[0] : elements };
return annotateMatcher(anno, (value, inspection) => {
if (!Array.isArray(value)) {
return failMatcher(inspection, `Expect an array but got '${typeof value}'`);
}
for (const element of elements) {
const failure = longestFailure(value, element);
if (failure) {
return failMatcher(inspection, `Array did not contain expected element, closest match at index ${failure[0]}: ${failure[1]}`);
}
}
return true;
/**
* Return 'null' if the matcher matches anywhere in the array, otherwise the longest error and its index
*/
function longestFailure(array, matcher) {
let fail = null;
for (let i = 0; i < array.length; i++) {
const innerInspection = { ...inspection, failureReason: '' };
if (match(array[i], matcher, innerInspection)) {
return null;
}
if (fail === null || innerInspection.failureReason.length > fail[1].length) {
fail = [i, innerInspection.failureReason];
}
}
return fail;
}
});
}
exports.arrayWith = arrayWith;
/**
* Whether a value is an object
*/
function isObject(x) {
// Because `typeof null === 'object'`.
return x && typeof x === 'object';
}
/**
* Helper function to make matcher failure reporting a little easier
*
* Our protocol is weird (change a string on a passed-in object and return 'false'),
* but I don't want to change that right now.
*/
function failMatcher(inspection, error) {
inspection.failureReason = error;
return false;
}
exports.failMatcher = failMatcher;
/**
* Match a given literal value against a matcher
*
* If the matcher is a callable, use that to evaluate the value. Otherwise, the values
* must be literally the same.
*/
function match(value, matcher, inspection) {
if (isCallable(matcher)) {
// Custom matcher (this mostly looks very weird because our `InspectionFailure` signature is weird)
const innerInspection = { ...inspection, failureReason: '' };
const result = matcher(value, innerInspection);
if (typeof result !== 'boolean') {
return failMatcher(inspection, `Predicate returned non-boolean return value: ${result}`);
}
if (!result && !innerInspection.failureReason) {
// Custom matcher neglected to return an error
return failMatcher(inspection, 'Predicate returned false');
}
// Propagate inner error in case of failure
if (!result) {
inspection.failureReason = innerInspection.failureReason;
}
return result;
}
return matchLiteral(value, matcher, inspection);
}
exports.match = match;
/**
* Match a literal value at the top level.
*
* When recursing into arrays or objects, the nested values can be either matchers
* or literals.
*/
function matchLiteral(value, pattern, inspection) {
if (pattern == null) {
return true;
}
const errors = new Array();
if (Array.isArray(value) !== Array.isArray(pattern)) {
return failMatcher(inspection, 'Array type mismatch');
}
if (Array.isArray(value)) {
if (pattern.length !== value.length) {
return failMatcher(inspection, 'Array length mismatch');
}
// Recurse comparison for individual objects
for (let i = 0; i < pattern.length; i++) {
if (!match(value[i], pattern[i], { ...inspection })) {
errors.push(`Array element ${i} mismatch`);
}
}
if (errors.length > 0) {
return failMatcher(inspection, errors.join(', '));
}
return true;
}
if ((typeof value === 'object') !== (typeof pattern === 'object')) {
return failMatcher(inspection, 'Object type mismatch');
}
if (typeof pattern === 'object') {
// Check that all fields in the pattern have the right value
const innerInspection = { ...inspection, failureReason: '' };
const matcher = objectLike(pattern)(value, innerInspection);
if (!matcher) {
inspection.failureReason = innerInspection.failureReason;
return false;
}
// Check no fields uncovered
const realFields = new Set(Object.keys(value));
for (const key of Object.keys(pattern)) {
realFields.delete(key);
}
if (realFields.size > 0) {
return failMatcher(inspection, `Unexpected keys present in object: ${Array.from(realFields).join(', ')}`);
}
return true;
}
if (value !== pattern) {
return failMatcher(inspection, 'Different values');
}
return true;
}
/**
* Whether a value is a callable
*/
function isCallable(x) {
return x && {}.toString.call(x) === '[object Function]';
}
/**
* Do a glob-like pattern match (which only supports *s). Supports multiline strings.
*/
function stringLike(pattern) {
// Replace * with .* in the string, escape the rest and brace with ^...$
const regex = new RegExp(`^${pattern.split('*').map(escapeRegex).join('.*')}$`, 'm');
return annotateMatcher({ $stringContaining: pattern }, (value, failure) => {
if (typeof value !== 'string') {
failure.failureReason = `Expected a string, but got '${typeof value}'`;
return false;
}
if (!regex.test(value)) {
failure.failureReason = 'String did not match pattern';
return false;
}
return true;
});
}
exports.stringLike = stringLike;
/**
* Matches any value
*/
function anything() {
return annotateMatcher({ $anything: true }, () => true);
}
exports.anything = anything;
/**
* Negate an inner matcher
*/
function notMatching(matcher) {
return annotateMatcher({ $notMatching: matcher }, (value, failure) => {
const result = matcherFrom(matcher)(value, failure);
if (result) {
failure.failureReason = 'Should not have matched, but did';
return false;
}
return true;
});
}
exports.notMatching = notMatching;
/**
* Captures a value onto an object if it matches a given inner matcher
*
* @example
*
* const someValue = Capture.aString();
* expect(stack).toHaveResource({
* // ...
* Value: someValue.capture(stringMatching('*a*')),
* });
* console.log(someValue.capturedValue);
*/
class Capture {
constructor(typeValidator) {
this.typeValidator = typeValidator;
this._didCapture = false;
this._wasInvoked = false;
}
/**
* A Capture object that captures any type
*/
static anyType() {
return new Capture();
}
/**
* A Capture object that captures a string type
*/
static aString() {
return new Capture((x) => {
if (typeof x !== 'string') {
throw new Error(`Expected to capture a string, got '${x}'`);
}
return true;
});
}
/**
* A Capture object that captures a custom type
*/
// eslint-disable-next-line @typescript-eslint/no-shadow
static a(validator) {
return new Capture(validator);
}
/**
* Capture the value if the inner matcher successfully matches it
*
* If no matcher is given, `anything()` is assumed.
*
* And exception will be thrown if the inner matcher returns `true` and
* the value turns out to be of a different type than the `Capture` object
* is expecting.
*/
capture(matcher) {
if (matcher === undefined) {
matcher = anything();
}
return annotateMatcher({ $capture: matcher }, (value, failure) => {
this._wasInvoked = true;
const result = matcherFrom(matcher)(value, failure);
if (result) {
if (this.typeValidator && !this.typeValidator(value)) {
throw new Error(`Value not of the expected type: ${value}`);
}
this._didCapture = true;
this._value = value;
}
return result;
});
}
/**
* Whether a value was successfully captured
*/
get didCapture() {
return this._didCapture;
}
/**
* Return the value that was captured
*
* Throws an exception if now value was captured
*/
get capturedValue() {
// When this module is ported to jsii, the type parameter will obviously
// have to be dropped and this will have to turn into an `any`.
if (!this.didCapture) {
throw new Error(`Did not capture a value: ${this._wasInvoked ? 'inner matcher failed' : 'never invoked'}`);
}
return this._value;
}
}
exports.Capture = Capture;
/**
* Match on the innards of a JSON string, instead of the complete string
*/
function encodedJson(matcher) {
return annotateMatcher({ $encodedJson: matcher }, (value, failure) => {
if (typeof value !== 'string') {
failure.failureReason = `Expected a string, but got '${typeof value}'`;
return false;
}
let decoded;
try {
decoded = JSON.parse(value);
}
catch (e) {
failure.failureReason = `String is not JSON: ${e}`;
return false;
}
return matcherFrom(matcher)(decoded, failure);
});
}
exports.encodedJson = encodedJson;
function escapeRegex(s) {
return s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); // $& means the whole matched string
}
/**
* Make a matcher out of the given argument if it's not a matcher already
*
* If it's not a matcher, it will be treated as a literal.
*/
function matcherFrom(matcher) {
return isCallable(matcher) ? matcher : exactValue(matcher);
}
exports.matcherFrom = matcherFrom;
/**
* Annotate a matcher with toJSON
*
* We will JSON.stringify() values if we have a match failure, but for matchers this
* would show (in traditional JS fashion) something like '[function Function]', or more
* accurately nothing at all since functions cannot be JSONified.
*
* We override to JSON() in order to produce a readable version of the matcher.
*/
function annotateMatcher(how, matcher) {
matcher.toJSON = () => how;
return matcher;
}
exports.annotateMatcher = annotateMatcher;
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{ ABSENT, InspectionFailure, PropertyMatcher } from './have-resource';\n\n/**\n * A matcher for an object that contains at least the given fields with the given matchers (or literals)\n *\n * Only does lenient matching one level deep, at the next level all objects must declare the\n * exact expected keys again.\n */\nexport function objectLike<A extends object>(pattern: A): PropertyMatcher {\n  return _objectContaining(pattern, false);\n}\n\n/**\n * A matcher for an object that contains at least the given fields with the given matchers (or literals)\n *\n * Switches to \"deep\" lenient matching. Nested objects also only need to contain declared keys.\n */\nexport function deepObjectLike<A extends object>(pattern: A): PropertyMatcher {\n  return _objectContaining(pattern, true);\n}\n\nfunction _objectContaining<A extends object>(pattern: A, deep: boolean): PropertyMatcher {\n  const anno = { [deep ? '$deepObjectLike' : '$objectLike']: pattern };\n\n  return annotateMatcher(anno, (value: any, inspection: InspectionFailure): boolean => {\n    if (typeof value !== 'object' || !value) {\n      return failMatcher(inspection, `Expect an object but got '${typeof value}'`);\n    }\n\n    const errors = new Array<string>();\n\n    for (const [patternKey, patternValue] of Object.entries(pattern)) {\n      if (patternValue === ABSENT) {\n        if (value[patternKey] !== undefined) { errors.push(`Field ${patternKey} present, but shouldn't be`); }\n        continue;\n      }\n\n      if (!(patternKey in value)) {\n        errors.push(`Field ${patternKey} missing`);\n        continue;\n      }\n\n      // If we are doing DEEP objectLike, translate object literals in the pattern into\n      // more `deepObjectLike` matchers, even if they occur in lists.\n      const matchValue = deep ? deepMatcherFromObjectLiteral(patternValue) : patternValue;\n\n      const innerInspection = { ...inspection, failureReason: '' };\n      const valueMatches = match(value[patternKey], matchValue, innerInspection);\n      if (!valueMatches) {\n        errors.push(`Field ${patternKey} mismatch: ${innerInspection.failureReason}`);\n      }\n    }\n\n    /**\n     * Transform nested object literals into more deep object matchers, if applicable\n     *\n     * Object literals in lists are also transformed.\n     */\n    function deepMatcherFromObjectLiteral(nestedPattern: any): any {\n      if (isObject(nestedPattern)) {\n        return deepObjectLike(nestedPattern);\n      }\n      if (Array.isArray(nestedPattern)) {\n        return nestedPattern.map(deepMatcherFromObjectLiteral);\n      }\n      return nestedPattern;\n    }\n\n    if (errors.length > 0) {\n      return failMatcher(inspection, errors.join(', '));\n    }\n    return true;\n  });\n}\n\n/**\n * Match exactly the given value\n *\n * This is the default, you only need this to escape from the deep lenient matching\n * of `deepObjectLike`.\n */\nexport function exactValue(expected: any): PropertyMatcher {\n  const anno = { $exactValue: expected };\n  return annotateMatcher(anno, (value: any, inspection: InspectionFailure): boolean => {\n    return matchLiteral(value, expected, inspection);\n  });\n}\n\n/**\n * A matcher for a list that contains all of the given elements in any order\n */\nexport function arrayWith(...elements: any[]): PropertyMatcher {\n  if (elements.length === 0) { return anything(); }\n\n  const anno = { $arrayContaining: elements.length === 1 ? elements[0] : elements };\n  return annotateMatcher(anno, (value: any, inspection: InspectionFailure): boolean => {\n    if (!Array.isArray(value)) {\n      return failMatcher(inspection, `Expect an array but got '${typeof value}'`);\n    }\n\n    for (const element of elements) {\n      const failure = longestFailure(value, element);\n      if (failure) {\n        return failMatcher(inspection, `Array did not contain expected element, closest match at index ${failure[0]}: ${failure[1]}`);\n      }\n    }\n\n    return true;\n\n    /**\n     * Return 'null' if the matcher matches anywhere in the array, otherwise the longest error and its index\n     */\n    function longestFailure(array: any[], matcher: any): [number, string] | null {\n      let fail: [number, string] | null = null;\n      for (let i = 0; i < array.length; i++) {\n        const innerInspection = { ...inspection, failureReason: '' };\n        if (match(array[i], matcher, innerInspection)) {\n          return null;\n        }\n\n        if (fail === null || innerInspection.failureReason.length > fail[1].length) {\n          fail = [i, innerInspection.failureReason];\n        }\n      }\n      return fail;\n    }\n  });\n}\n\n/**\n * Whether a value is an object\n */\nfunction isObject(x: any): x is object {\n  // Because `typeof null === 'object'`.\n  return x && typeof x === 'object';\n}\n\n/**\n * Helper function to make matcher failure reporting a little easier\n *\n * Our protocol is weird (change a string on a passed-in object and return 'false'),\n * but I don't want to change that right now.\n */\nexport function failMatcher(inspection: InspectionFailure, error: string): boolean {\n  inspection.failureReason = error;\n  return false;\n}\n\n/**\n * Match a given literal value against a matcher\n *\n * If the matcher is a callable, use that to evaluate the value. Otherwise, the values\n * must be literally the same.\n */\nexport function match(value: any, matcher: any, inspection: InspectionFailure) {\n  if (isCallable(matcher)) {\n    // Custom matcher (this mostly looks very weird because our `InspectionFailure` signature is weird)\n    const innerInspection: InspectionFailure = { ...inspection, failureReason: '' };\n    const result = matcher(value, innerInspection);\n    if (typeof result !== 'boolean') {\n      return failMatcher(inspection, `Predicate returned non-boolean return value: ${result}`);\n    }\n    if (!result && !innerInspection.failureReason) {\n      // Custom matcher neglected to return an error\n      return failMatcher(inspection, 'Predicate returned false');\n    }\n    // Propagate inner error in case of failure\n    if (!result) { inspection.failureReason = innerInspection.failureReason; }\n    return result;\n  }\n\n  return matchLiteral(value, matcher, inspection);\n}\n\n/**\n * Match a literal value at the top level.\n *\n * When recursing into arrays or objects, the nested values can be either matchers\n * or literals.\n */\nfunction matchLiteral(value: any, pattern: any, inspection: InspectionFailure) {\n  if (pattern == null) { return true; }\n\n  const errors = new Array<string>();\n\n  if (Array.isArray(value) !== Array.isArray(pattern)) {\n    return failMatcher(inspection, 'Array type mismatch');\n  }\n  if (Array.isArray(value)) {\n    if (pattern.length !== value.length) {\n      return failMatcher(inspection, 'Array length mismatch');\n    }\n\n    // Recurse comparison for individual objects\n    for (let i = 0; i < pattern.length; i++) {\n      if (!match(value[i], pattern[i], { ...inspection })) {\n        errors.push(`Array element ${i} mismatch`);\n      }\n    }\n\n    if (errors.length > 0) {\n      return failMatcher(inspection, errors.join(', '));\n    }\n    return true;\n  }\n  if ((typeof value === 'object') !== (typeof pattern === 'object')) {\n    return failMatcher(inspection, 'Object type mismatch');\n  }\n  if (typeof pattern === 'object') {\n    // Check that all fields in the pattern have the right value\n    const innerInspection = { ...inspection, failureReason: '' };\n    const matcher = objectLike(pattern)(value, innerInspection);\n    if (!matcher) {\n      inspection.failureReason = innerInspection.failureReason;\n      return false;\n    }\n\n    // Check no fields uncovered\n    const realFields = new Set(Object.keys(value));\n    for (const key of Object.keys(pattern)) { realFields.delete(key); }\n    if (realFields.size > 0) {\n      return failMatcher(inspection, `Unexpected keys present in object: ${Array.from(realFields).join(', ')}`);\n    }\n    return true;\n  }\n\n  if (value !== pattern) {\n    return failMatcher(inspection, 'Different values');\n  }\n\n  return true;\n}\n\n/**\n * Whether a value is a callable\n */\nfunction isCallable(x: any): x is ((...args: any[]) => any) {\n  return x && {}.toString.call(x) === '[object Function]';\n}\n\n/**\n * Do a glob-like pattern match (which only supports *s). Supports multiline strings.\n */\nexport function stringLike(pattern: string): PropertyMatcher {\n  // Replace * with .* in the string, escape the rest and brace with ^...$\n  const regex = new RegExp(`^${pattern.split('*').map(escapeRegex).join('.*')}$`, 'm');\n\n  return annotateMatcher({ $stringContaining: pattern }, (value: any, failure: InspectionFailure) => {\n    if (typeof value !== 'string') {\n      failure.failureReason = `Expected a string, but got '${typeof value}'`;\n      return false;\n    }\n\n    if (!regex.test(value)) {\n      failure.failureReason = 'String did not match pattern';\n      return false;\n    }\n\n    return true;\n  });\n}\n\n/**\n * Matches any value\n */\nexport function anything(): PropertyMatcher {\n  return annotateMatcher({ $anything: true }, () => true);\n}\n\n/**\n * Negate an inner matcher\n */\nexport function notMatching(matcher: any): PropertyMatcher {\n  return annotateMatcher({ $notMatching: matcher }, (value: any, failure: InspectionFailure) => {\n    const result = matcherFrom(matcher)(value, failure);\n    if (result) {\n      failure.failureReason = 'Should not have matched, but did';\n      return false;\n    }\n    return true;\n  });\n}\n\nexport type TypeValidator<T> = (x: any) => x is T;\n\n/**\n * Captures a value onto an object if it matches a given inner matcher\n *\n * @example\n *\n * const someValue = Capture.aString();\n * expect(stack).toHaveResource({\n *    // ...\n *    Value: someValue.capture(stringMatching('*a*')),\n * });\n * console.log(someValue.capturedValue);\n */\nexport class Capture<T=any> {\n  /**\n   * A Capture object that captures any type\n   */\n  public static anyType(): Capture<any> {\n    return new Capture();\n  }\n\n  /**\n   * A Capture object that captures a string type\n   */\n  public static aString(): Capture<string> {\n    return new Capture((x: any): x is string => {\n      if (typeof x !== 'string') {\n        throw new Error(`Expected to capture a string, got '${x}'`);\n      }\n      return true;\n    });\n  }\n\n  /**\n   * A Capture object that captures a custom type\n   */\n  // eslint-disable-next-line @typescript-eslint/no-shadow\n  public static a<T>(validator: TypeValidator<T>): Capture<T> {\n    return new Capture(validator);\n  }\n\n  private _value?: T;\n  private _didCapture = false;\n  private _wasInvoked = false;\n\n  protected constructor(private readonly typeValidator?: TypeValidator<T>) {\n  }\n\n  /**\n   * Capture the value if the inner matcher successfully matches it\n   *\n   * If no matcher is given, `anything()` is assumed.\n   *\n   * And exception will be thrown if the inner matcher returns `true` and\n   * the value turns out to be of a different type than the `Capture` object\n   * is expecting.\n   */\n  public capture(matcher?: any): PropertyMatcher {\n    if (matcher === undefined) {\n      matcher = anything();\n    }\n\n    return annotateMatcher({ $capture: matcher }, (value: any, failure: InspectionFailure) => {\n      this._wasInvoked = true;\n      const result = matcherFrom(matcher)(value, failure);\n      if (result) {\n        if (this.typeValidator && !this.typeValidator(value)) {\n          throw new Error(`Value not of the expected type: ${value}`);\n        }\n        this._didCapture = true;\n        this._value = value;\n      }\n      return result;\n    });\n  }\n\n  /**\n   * Whether a value was successfully captured\n   */\n  public get didCapture() {\n    return this._didCapture;\n  }\n\n  /**\n   * Return the value that was captured\n   *\n   * Throws an exception if now value was captured\n   */\n  public get capturedValue(): T {\n    // When this module is ported to jsii, the type parameter will obviously\n    // have to be dropped and this will have to turn into an `any`.\n    if (!this.didCapture) {\n      throw new Error(`Did not capture a value: ${this._wasInvoked ? 'inner matcher failed' : 'never invoked'}`);\n    }\n    return this._value!;\n  }\n}\n\n/**\n * Match on the innards of a JSON string, instead of the complete string\n */\nexport function encodedJson(matcher: any): PropertyMatcher {\n  return annotateMatcher({ $encodedJson: matcher }, (value: any, failure: InspectionFailure) => {\n    if (typeof value !== 'string') {\n      failure.failureReason = `Expected a string, but got '${typeof value}'`;\n      return false;\n    }\n\n    let decoded;\n    try {\n      decoded = JSON.parse(value);\n    } catch (e) {\n      failure.failureReason = `String is not JSON: ${e}`;\n      return false;\n    }\n\n    return matcherFrom(matcher)(decoded, failure);\n  });\n}\n\nfunction escapeRegex(s: string) {\n  return s.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\$&'); // $& means the whole matched string\n}\n\n/**\n * Make a matcher out of the given argument if it's not a matcher already\n *\n * If it's not a matcher, it will be treated as a literal.\n */\nexport function matcherFrom(matcher: any): PropertyMatcher {\n  return isCallable(matcher) ? matcher : exactValue(matcher);\n}\n\n/**\n * Annotate a matcher with toJSON\n *\n * We will JSON.stringify() values if we have a match failure, but for matchers this\n * would show (in traditional JS fashion) something like '[function Function]', or more\n * accurately nothing at all since functions cannot be JSONified.\n *\n * We override to JSON() in order to produce a readable version of the matcher.\n */\nexport function annotateMatcher<A extends object>(how: A, matcher: PropertyMatcher): PropertyMatcher {\n  (matcher as any).toJSON = () => how;\n  return matcher;\n}\n"]}